CN101566012A - Air cooling device bracket for large-size thermal power plant - Google Patents
Air cooling device bracket for large-size thermal power plant Download PDFInfo
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Abstract
一种用于大型火力发电厂的空冷设备支架，包括钢桁架及设于钢桁架下方用于支撑钢桁架的钢筋混凝土管柱；钢桁架上设置A型架，钢桁架的四周设置挡风墙；在钢桁架底部和钢筋混凝土管柱之间设有支撑件。本支架的减小了竖向设备荷重荷载作用下钢桁架端部挠度、降低钢桁架高度，可有效降低工程造价。
An air-cooling equipment support for a large-scale thermal power plant, comprising a steel truss and a reinforced concrete pipe column arranged under the steel truss for supporting the steel truss; an A-frame is arranged on the steel truss, and windshield walls are arranged around the steel truss; Supports are provided between the bottom of the steel truss and the reinforced concrete column. The support reduces the deflection of the end of the steel truss under the action of the vertical equipment load, reduces the height of the steel truss, and can effectively reduce the construction cost.
Description
Technical field
The present invention relates to a kind of air cooling device bracket, relate in particular to a kind of supporting structure that is used for the air cooling apparatus unit of large-size thermal power plant.
Background technology
Thermal power generation is the main forms of electricity generation of China in the regular period at present and from now on, and wherein, the structure facility of power plant is important lifeline engineering ingredient.In the past, traditional steam power station generally adopts the clammy technology of cooling tower to cool off weary gas from steam turbine generator, but because wet cooling tower recirculated water carries out interchange of heat with " drenching with rain " mode and weary gas, in cooling procedure, part water is evaporated in the air, another part water is depleted, and has caused a large amount of wastes of water resource.And the Power Plant in China major part concentrates on northern rich coal water-deficient area, all will consume great amount of water resources every year, therefore, existing large-size thermal power plant generally adopts a kind of novel cooling water process---air cooling tubes condenser cooling water process, it is that the weary gas of steam turbine is directly used air cooling, whole cooling procedure is carried out in closed system, than the clammy technology conserve water of traditional cooling tower resource 70～80%.
As the support of air cooling apparatus main supports such as air cooling tubes condenser, its upper support nearly ten thousand tons equipment loading, is bearing the dynamic loading of various complexity, and the safety of platform is directly connected to and sends out, the safe operation of power supply whole system.At present, the research of Power Plant in China Air-cooled Unit and application still are in the elementary step, there are not country and industry design discipline, standard, continued to use external traditional form generally in the air cooling technique each side, traditional air cooling device bracket main feature is as follows: (1). large span, long cantilever, heavy load; (2). quality and Stiffness Distribution are extremely inhomogeneous, are the gentle down firm high pin chicken leg formula structures that; (3). structure connects complicated, the bottom be little wall footpath than large-sized reinforced concrete pipe column, top for stride greatly, the intersection steel truss of long cantilever, connect complicatedly, belong to steel--concrete composite structure; (4). the long-term low frequency running of power-equipment blower fan, easy and structure produces resonance; (5). the structure construction difficulty is very big, mainly shows in the construction of the construction of reinforced concrete pipe column and Steel Space Truss node.
All the time, the design market of air cooling power plant is occupied by external GEA company, SPX Co., past, domestic Construction unit was in order to save initial cost, usually the mode that adopts foreign corporation to supply less, design more is purchased, and offshore company only is responsible for designing and not supplying, this makes that their design is partial to security consideration more, has caused huge waste.For this reason, be necessary to propose a kind of novel air cooling tubes condenser supporting structure and optimize system, make its national conditions that more meet China, and the technology of thoroughly breaking away from foreign side relies on the comprehensive localization Design of realization air cooling tubes condenser supporting structure.
Summary of the invention
The purpose of this invention is to provide a kind of air cooling device bracket that is used for large-size thermal power plant, having reduced steel truss end amount of deflection under the vertical equipment loading load action, reducing the steel truss height of this support can effectively reduce construction costs.
To achieve these goals, the present invention takes following technical solution:
A kind of air cooling device bracket that is used for large-size thermal power plant comprises steel truss and is located at the reinforced concrete pipe column that the steel truss below is used for supporting steel truss; A type frame is set on the steel truss, windbreak is set around the steel truss; Between steel truss bottom and reinforced concrete pipe column, be provided with support member.
Further, being connected between the end of support member and steel truss bottom and the reinforced concrete pipe column is articulated and connected.
Further, an end of support member is located at the point midway place between two reinforced concrete pipe columns of steel truss, and the other end is located on the reinforced concrete pipe column.
Further, the slenderness ratio of support member≤150.
By above and the test calculated data as seen, the present invention sets up the steel truss bottom in traditional air cooling tubes condenser supporting structure system square steel pipe or round steel pipe supports, the end that steel supports and the lower edge H shaped steel of steel truss are hinged, the other end is connected with the concrete tubing string, and steel supports and can bear vertical load and the horizontal earthquake action of being transmitted by the upper steel truss.After the steel support was set, supporting structure rigidity had obvious increase, and the vertical rigidity of pillar line rigidity, structure lateral displacement integral rigidity, steel truss improves, and the structural entity torsion problem also obtains alleviation to a certain degree.Overcome exist in the existing air cooling supporting structure system lower rebar concrete tubing string, truss encorbelment the excessive and local rod member of end movement stressed excessive etc. some be unfavorable for the problem of antidetonation,--steel truss--steel diagonal brace air cooling device bracket structure that proposes reinforced concrete pipe column of the present invention based on this problem, structure lateral displacement under wind load and geological process reduces, and the displacement under wind load and geological process is than little with the displacement response of caliber reinforced concrete pipe column-steel truss air cooling supporting structure.
Description of drawings
Fig. 1 is vertical view of the present invention;
Fig. 2 is a transverse views of the present invention;
Fig. 3 is the structural representation of support member of the present invention;
Fig. 4 is the schematic diagram of the hinge point of support member of the present invention;
Fig. 5 is the distortion schematic diagram of the present invention's structure under the dead load effect;
Fig. 6 is the distortion schematic diagram of the present invention's structure under the mobile load effect;
Fig. 7 is the distortion schematic diagram of the present invention in X structure under wind action;
Fig. 8 is the distortion schematic diagram of the present invention in Y structure under wind action;
Fig. 9 is the present invention's one first order mode schematic diagram;
Figure 10 is the present invention's two first order mode schematic diagrames;
Figure 11 is the present invention's three first order mode schematic diagrames;
Figure 12 is the distortion schematic diagram of X of the present invention structure under geological process;
Figure 13 is the distortion schematic diagram of Y of the present invention structure under geological process;
Figure 14 is AE axis portion node location contrast figure of the present invention;
Figure 15 is the AE axis of the present invention node UX curve map that winds up;
Figure 16 is the AE axis of the present invention node UY curve map that winds up;
Figure 17 is the AE axis of the present invention node UZ curve map that winds up;
Figure 18 is an AE axis lower-chord panel point UX curve map of the present invention;
Figure 19 is an AE axis lower-chord panel point UY curve map of the present invention;
Figure 20 is an AE axis lower-chord panel point UZ curve map of the present invention;
Figure 21 is A1 axis portion node location contrast figure of the present invention;
Figure 22 is the A1 axis of the present invention node UX curve map that winds up;
Figure 23 is the A1 axis of the present invention node UY curve map that winds up;
Figure 24 is the A1 axis of the present invention node UZ curve map that winds up;
Figure 25 is an A1 axis lower-chord panel point UX curve map of the present invention;
Figure 26 is an A1 axis lower-chord panel point UY curve map of the present invention;
Figure 27 is an A1 axis lower-chord panel point UZ curve map of the present invention;
Figure 28 is an A1 axis lower-chord panel point UZ curve map of the present invention.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is done explanation in further detail.
The specific embodiment
As shown in Figures 1 and 2, air cooling device bracket of the present invention comprises steel truss 1, windbreak 2, A type frame 3, reinforced concrete pipe column 4, support member 5.With reference to Fig. 3, support member 5 is the steel support member in the present embodiment, can adopt square steel pipe or round steel pipe, and support member 5 designs by compressed member, and calculated length is got the geometrical length of support, and its slenderness ratio is≤150.Support member 5 comprises pre-embedded steel slab 6, stiffening rib 8, head plate 9, plate 10 and pin 11.
Reinforced concrete pipe column 4 is finished by cast in situs, and steel truss 1 is an on-site consolidation also, is installed on the top of reinforced concrete pipe column 4, and wherein the making of steel node is all finished in factory.A type frame 3 is set on steel truss 1, windbreak 2 is set around steel truss 1.Steel truss 1, windbreak 2, A type frame 3, reinforced concrete pipe column 4 have been formed air cooling device bracket, as shown in Figures 1 and 2.Between the bottom of steel truss 1 and reinforced concrete pipe column 4, support member 5 is set, steel truss 1 and reinforced concrete pipe column 4 is linked together, to form the air cooling device bracket new structural system that band supports by oblique support member 5.Connecting portion between support member 5 two ends and steel truss 1 and the reinforced concrete pipe column 4 can adopt hinged, as shown in Figures 3 and 4, the hinged contact surface that can improve support member 5 and steel truss 1 and reinforced concrete pipe column 4 connected nodes hour can't reach the situation of the power transmission effect when rigidly connecting.In the present embodiment, support member 5 one ends are arranged on the reinforced concrete pipe column 4, and the other end is arranged on the lower edge H shaped steel 12 in the steel truss 1, and preferred, this end can be arranged at two point midway places between the reinforced concrete pipe column 4.
The present invention is by increasing support member 5 between reinforced concrete pipe column 4 and steel truss 1 bottom, strengthened support to steel truss between the reinforced concrete pipe column 4, can when guaranteeing the steel truss density of load, effectively reduce the height of steel truss, reduce construction costs.
Below by test and calculate and to further specify effect of the present invention:
Existing calculating shows, even the steel truss of air cooling device bracket its end amount of deflection under the dead load effect is also bigger, and the related request that has even surpassed China's standard.And the height that increases steel truss is also not obvious for reducing its end amount of deflection effect of encorbelmenting.Especially under geological process; because the whole moment of flexure of the A type frame on steel truss top part; the stressed burden of steel truss also will be aggravated; the amount of deflection of steel truss also will increase and be in the variation always; this part will be destroyed under geological process so, jeopardizes the safety of steel truss superstructure and capital equipment.Therefore the present invention supports by set up steel between steel truss bottom and reinforced concrete pipe column, as shown in Figures 1 and 2.
At reinforced concrete pipe column--under the prerequisite of steel truss combination construction scheme, reduce the flat height of pillar sectional dimension and Steel Space Truss, with reinforced concrete pipe column--the steel truss bottom is set up steel and is supported (square steel 500 * 500 * 12) in the steel truss combination construction.
Below be the sized data of steel truss each several part:
The pillar sectional dimension: pillar adopts reinforced concrete pipe column, and overall height is 50.0m, and sectional dimension is 4.0m * 0.40m;
Steel Space Truss: scantling is with reference to the scantling in the state Hua Jin circle air cooling tubes condenser platform of 600MW Shaanxi in the Steel Space Truss.X is to distance between axles 11.31m, and Z is platform spacing 5.0m up and down, and Y is to distance between axles 11.6m;
Material properties: concrete adopts linear elasticity model, elastic modulus E=3.25 * 104N/mm2, poisson's ratio v=0.20, density of material ρ=2450kg/m3; Steel adopt linear elasticity model, elastic modulus E=2.00 * 105N/mm2, poisson's ratio v=0.30, density of material ρ=7849kg/m3;
Member section parameter such as table 1:
Table 1 member section property list
| Numbering | Classification/model | S(cm 2) | I yy(cm 4) | I zz(cm 4) | J(cm 4) | t 1 (mm) | t 2 (mm) |
| 1 | HW414 | 296.2 | 31E3 | 93E3 | 662.2 | 18 | 28 |
| 2 | HN400 | 81.92 | 1.73E3 | 23E3 | 35.676 | 8 | 13 |
| 3 | HW250 | 91.43 | 3.648E3 | 10.69E3 | 49.38 | 9 | 14 |
| 5 | TUBE273×10 | 82.62 | 7.15E3 | 7.15E3 | 14.3E3 | 10 | 10 |
| 6 | TUBE325×12 | 118.0 | 14.47E3 | 14.47E3 | 28.9E3 | 12 | 12 |
| 7 | TUBE351×12 | 127.8 | 18.38E3 | 18.38E3 | 36.7E3 | 12 | 12 |
| 8 | TUBE402×12 | 146.95 | 27.99E3 | 27.99E3 | 55.96E3 | 12 | 12 |
| 9 | TUBE600×16 | 293.4 | 125.27E3 | 125.27E3 | 250.48E3 | 16 | 16 |
Below the loadometer of air cooling device bracket of the present invention be can be regarded as explanation:
1., the computational analysis of air cooling device bracket under the dead load effect
The entire infrastructure member dead weight is calculated by bar cross section area and length voluntarily by program, considers the construction details, steel density be multiply by 1.05 coefficient.The dead load on support top mainly comprises: guidance tape deadweight, partition wall deadweight, fan and protective screening deadweight, fan bridge deadweight, main feedline deadweight, A type frame load etc. are conducted oneself with dignity, walked to windbreak.According to actual engine request, point load puts on the node of model space steel truss, and evenly distributed load acts on the member.
Malformation figure under the dead load effect as shown in Figure 5.Calculating shows that the maximum vertical distortion of structure occurs in the cantilever edge place, does not occur in span centre.Its maximum deformation value is 14.6mm, is 1/775 of jib-length.
Under the dead load effect, the distortion of 55.0 meters high platform fan unit intersection points of structure place's vertical displacement UZ maximum vertical occurs in four bights of platform, owing to be provided with support member between steel truss bottom and the reinforced concrete pipe column, make its deformation ratio large-span steel-reinforced concrete tubing string-steel truss structure result of calculation little, maximum deformation value is 10.12mm.
2., the computational analysis of air cooling device bracket under the live load effect
The suffered live load of entire infrastructure member is mainly the maintenance load, comprises General Maintenance and walks guidance tape, radiator, blower fan maintenance etc.According to actual engine request, point load puts on the node of model space truss, and evenly distributed load acts on the member.
Malformation figure under the live load effect as shown in Figure 6.Calculating shows that the maximum vertical distortion of structure occurs in the cantilever edge place, and maximum deformation value is 4.35mm.Under the mobile load effect, four bights that platform takes place the distortion of 55.0 meters high platform fan unit intersection points of structure place's vertical displacement UZ maximum vertical, maximum deformation value is 2.6mm.
3., the computational analysis of air cooling device bracket under the snow load effect
Snow load comprises walking the snow load of guidance tape snow load and A type frame part.Calculating shows that maximum deformation value is 0.70mm.Under the dead load effect, four bights that platform takes place the distortion of 55.0 meters high platform fan unit intersection points of structure place's vertical displacement UZ maximum vertical, maximum deformation value is 0.43mm.
4., air cooling device bracket computational analysis under the wind action
(1) X is to wind action
Wind load comprises verge board, steel truss and intercolumniation wind load.Calculating shows that maximum deformation value is 22.8mm.The rigidity of space steel truss is big in the air cooling device bracket structure, and under wind action, mainly be made up of the flexural deformation of concrete tubing string, as shown in Figure 7 by its horizontal movement at X for structure.
(2) Y is to wind action
Wind load comprises verge board, steel truss and intercolumniation wind load.Calculating shows that maximum deformation value is 17.2mm.The rigidity of air cooling supporting structure Steel Space Truss is big, and under wind action, mainly be made up of the flexural deformation of reinforced concrete pipe column, as shown in Figure 8 by its horizontal movement at Y for structure.
5., the model analysis of air cooling device bracket
In the air cooling device bracket platform, the quality of reinforced concrete pipe column is big, and quality is a linear distribution, and is in order to simulate the Mass Distribution of air cooling device bracket preferably, that the quality of reinforced concrete pipe column is high by 5 lumped masses distributions along post.With reference to table 2, table 2 is each rank modal parameter table simultaneously.In the model analysis, a first order mode be reverse, second rank be X to translation, three first order modes be Y to translation, to shown in Figure 11, be respectively the schematic diagram of a first order mode, two first order modes and three first order modes as Fig. 9.
Each rank modal parameter table of table 2
| Mode | Cycle (s) | Frequency (Hz) | X participates in the coefficient aggregate-value to quality | Y participates in the coefficient aggregate-value to quality | Rz participates in the coefficient aggregate-value to |
| 1 | 1.202608 | 0.83153 | 0.21369 | 0.01727 | 0.40183 |
| 2 | 1.166786 | 0.85706 | 0.82654 | 0.12772 | 0.53301 |
| 3 | 1.156332 | 0.8648 | 0.87915 | 0.88363 | 0.88661 |
| 4 | 0.364973 | 2.7399 | 0.87918 | 0.88363 | 0.88664 |
| 5 | 0.317704 | 3.1476 | 0.87918 | 0.88364 | 0.88665 |
| 85 | 0.291068 | 3.4356 | 0.8849 | 0.88365 | 0.88814 |
| 86 | 0.282702 | 3.5373 | 0.89006 | 0.88365 | 0.88943 |
| 87 | 0.271591 | 3.682 | 0.89006 | 0.88366 | 0.88944 |
| 88 | 0.249219 | 4.0125 | 0.8849 | 0.88365 | 0.89003 |
| 118 | 0.196017 | 5.1016 | 0.89902 | 0.89984 | 0.8997 |
| 119 | 0.19601 | 5.1018 | 0.90129 | 0.90147 | 0.91425 |
| 120 | 0.195998 | 5.1021 | 0.90154 | 0.90225 | 0.91654 |
FEM modal analysis and modal:
The basic cycle of the air cooling device bracket structure of 1, reinforced concrete pipe column--steel truss--steel bearing diagonal spare, torsional effect was obvious about 1.2s, and the coupling of former first order modes of structure is obvious, the vibration shape complexity of structure;
2, a first order mode of structure is for reversing, and two, three first order modes are the vibration of two major axes orientations respectively.From the quadravalence vibration shape, frequency, cycle undergo mutation, and the vibration of two major axes orientations of this explanation is its main vibration mode;
3, the air cooling device bracket rigidity of structure and quality are seriously inhomogeneous along vertical distribution, and the former first order mode frequencies of structure are approaching, so equivalent base shear method is not suitable for the geological process calculating of this class formation.The suggestion geological process adopts when calculating and reverses coupling vibration shape decomposition reaction spectrometry;
4, structural vibration mode is complicated, should note avoiding allowing power-equipments such as itself and blower fan resonate.
6., the response spectrum analysis of air cooling device bracket (Response Spectrum Analysis)
Major parameter is as follows:
Earthquake grouping: first group of design earthquake
Earthquake intensity: octave (0.20g)
Place type: III class, Tg=0.45s
Damped coefficient: 0.035
Frequently occurred earthquake: α
Max=0.16
Unidirectional geological process
(1) X is to geological process
The seismic ground acceleration is acted on X adopt the CQC method to, modal combination.Analysis result is that maximum deformation value is 32.4mm, and malformation as shown in figure 12.
Because the rigidity of steel support member is big in the air cooling device bracket, the effect of steel support member is equivalent to be provided with flexible horizontal support at high 4/5 place of reinforced concrete pipe column.Under geological process, the displacement of supporting role point and steel truss is inharmonious at X for support, the capital counter-force that causes reinforced concrete pipe column greater than post at the bottom of counter-force.The rigidity of air cooling device bracket structure space steel truss is big, and under geological process, mainly be made up of the flexural deformation of reinforced concrete pipe column by its horizontal movement at X for structure, and Steel Space Truss is similar to whole translation.
(2) Y is to geological process
The seismic ground acceleration is acted on Y to shown in, result is shown in Figure 13 and table 3, and modal combination adopts the CQC method.Analysis result is that maximum deformation value is 28.8mm.
Table 3 is pressed substrate counter-force tabulation under CQC method and the SRSS method geological process
| The substrate counter-force | F1 (kN) | F2 (kN) | F3 (kN) | M1 (kN.m) | M2 (kN.m) | M3 (kN.m) |
| X is to geological process (CQC) | 13234.556 | 457.206 | 136.98 | 24013.9892 | 668500.0861 | 474820.5154 |
| X is to geological process (SRSS) | 10145.044 | 5215.37 | 162.399 | 264296.2405 | 512084.9319 | 474539.1994 |
| Y is to geological process (CQC) | 457.196 | 13799.256 | 167.432 | 698791.8429 | 23944.5282 | 645762.7068 |
| Y is to geological process (SRSS) | 5215.445 | 11019.509 | 102.992 | 607771.1983 | 263711.6989 | 603249.959 |
Two-way geological process
The former first order mode frequencies of air cooling device bracket are approaching, and twisting action is obvious.Should increase the earthquake sheet combination of considering under the two-way horizontal geological process.The seismic ground acceleration is acted on little X, Y adopt the CQC method to, modal combination, the SRSS method of revising is adopted in the direction combination, with reference to table 4.Ux is that 33.2mm, Uy are 29.6mm to maximum deformation value to maximum deformation value.
Substrate counter-force comparison sheet under table 4 geological process
| The substrate counter-force | F1 (kN) | F2 (kN) | F3 (kN) | M1 (kN.m) | M2 (kN.m) | M3 (kN.m) |
| Two-way geological process (total) | 13240.261 | 13804.728 | 203.937 | 699089.8976 | 668809.8412 | 761511.8945 |
| X is to geological process (total) | 13234.556 | 457.206 | 136.98 | 24013.9892 | 668500.0861 | 474820.5154 |
| Y is to geological process (total) | 457.196 | 13799.256 | 167.432 | 698791.8429 | 23944.5282 | 645762.7068 |
Response spectrum result of calculation:
1, reinforced concrete pipe column--steel truss--steel support member air cooling device bracket is under geological process, and horizontal movement mainly is made up of the flexural deformation of reinforced concrete pipe column, and Steel Space Truss rigidity is big, approximate whole translation;
2, in reinforced concrete pipe column--steel truss--the steel support member air cooling device bracket, the height height of concrete tubing string, quality are big, and Mass Distribution is pressed linear distribution.Reinforced concrete pipe column is about 25% of total substrate counter-force by the seismic forces that reinforced concrete pipe column produced under geological process.Having limit during element analysis model,, reinforced concrete pipe column is carried out reasonable dividing elements for this reason, advise every joint≤10 meter in order in the finite element analysis program, to simulate its Mass Distribution preferably;
3, reinforced concrete pipe column under the geological process--steel truss--steel support member air cooling device bracket, the shearing that is passed to reinforced concrete pipe column by support member is about about 45% of substrate counter-force.The steel support member is main Force transmission parts, answers the slenderness ratio and the design stress ratio of strict control steel supporting component in the air cooling device bracket design, and the slenderness ratio of this steel support member is≤150;
3, reinforced concrete pipe column--steel truss--steel support member air cooling device bracket construction torsion is obvious, and former first order mode couplings of support are obvious.Therefore press under CQC method and the SRSS method geological process substrate counter-force difference (about 25%) greatly as a result;
4, reversing of two-way horizontal geological process should be determined for a short time by the higher value in the following formula:
Through comparative analysis as seen: X under geological process during with two-way geological process at the bottom of each tubing string of air cooling device bracket the shearing maximum differ 0.45%, Y under geological process during with two-way geological process at the bottom of each tubing string of air cooling device bracket the shearing maximum differ 3.1%;
5, reinforced concrete pipe column--steel truss--steel support member air cooling device bracket is when geological process, and when calculating by unidirectional and two-way horizontal geological process torsional effect, the base shear difference of each tubing string is little.This mainly be since in the quality of reinforced concrete pipe column--steel truss--steel support member air cooling device bracket with center of rigidity eccentricity e in the plane
x, e
yLess, adopt with the direction combination of geological process simultaneously
Calculate relevant.
7., the structural response analysis that causes of the blower fan power of disturbing
(1) blower fan is scratched determining of power
Because the impossible complete equipilibrium of the manufacturing of wheel hub and blade always has certain off-centre to exist, and therefore according to the balance quality grade (G6.3) of impeller, can calculate the maximum eccentric square e that impeller allows.
Eccentricity
So the blower fan under the rated speed radially imbalance is scratched power amplitude P and is:
The actual blower fan power of disturbing is a simple harmonic quantity power, during calculating it is reduced to static(al), is about to the power of disturbing and is added in steel truss to end face.
(2) blower fan entry into service steady-state analysis under the rated speed
Least favorable situation under this Work condition analogue blower fan standard-sized sheet normal operation, all directions are disturbed all identical maximum value that reaches of power.The displacement response of node on all directions all reaches maximum value. and this is an analytic target with the last lower edge point in the steel truss in A1, A5, AA, the AE axis on the platform just, respectively with reference to Figure 18 to Figure 32.
Stable state result of calculation:
When exciting force, all resonates at all directions node during to acting in conjunction along X, Y and Z, it is as follows to obtain conclusion:
1, when disturbing the power load along a certain directive effect, during near natural frequency of structures, the displacement structure reaction enlarges markedly, and produces covibration, same directional response unanimity of each node of lower edge on each in this direction excited frequency;
2, the blower fan on reinforced concrete pipe column--steel truss--the steel support member air cooling device bracket variant-frequency vibration (0～5.0Hz) time might and support produce resonance, should give consideration during the supporting structure design.Displacement amplitude is no more than 0.13mm during resonance, notes the fatigue failure of member, destroys for avoiding structural fatigue, and structural steel must not be selected boiling steel for use, and steel should have assurances of conformity such as normal temperature impact toughness and cold bending test.Should adopt the friction-type high-strength bolt to connect as far as possible;
3, under various operating modes, to the response pattern unanimity, last lower edge reaction is also identical at X for each node; The reaction peak value has bigger response in low order (0.85Hz).X is 1.05 * 10-1mm to the peak response amplitude;
4, under various operating modes, to the response pattern unanimity, last lower edge reaction is also identical at Y for each node; The reaction peak value has bigger response in low order (0.85Hz).Y is 1.3 * 10-1mm to the peak response amplitude;
5, because the difference of vertical constraint, each node reaction has than big difference each joint point Z, and the frequency band broad of resonance takes place to the reaction peak value.Because the rigidity of air cooling steel truss is big, and the frequency of structure vertical motion is big, each joint point Z is less to the response amplitude of reaction peak value in the 0-5Hz scope for this reason simultaneously;
6, planar, the displacement response of last lower-chord panel point all directions is all identical, and the structural entity rigidity of reinforced concrete pipe column is described--steel truss--steel support member air cooling device bracket is reasonable.
7, air cooling supporting structure displacement maximum when blower fan is all opened, but maximum displacement is less than 0.20mm.This shift value can not be ignored as dynamic displacement.This is in the elastic range of structure, and is little to structure influence from loading angle.But this dynamic displacement frequently occurs when the structure operate as normal, and the variation of structural internal force also is frequent the appearance.So answer the fatigue failure of attention structure, structure design must take in when handling with structure; From blower fan run well structure down steady-state analysis as can be known: when disturbing the power load along a certain directive effect, during near natural frequency of structures, air cooling supporting structure displacement response enlarges markedly, and produces covibration in this direction excited frequency.The running of blower fan low frequency is greater than the influence of high frequency running to structure to the influence of structure.In the actual engineering, should avoid as early as possible at first three order frequency place of structure during the blower fan running.
By above test calculation specifications, the present invention sets up oblique steel support member between the reinforced concrete pipe column of air cooling device bracket and steel truss bottom, can effectively strengthen the weight bearing power of steel truss, and by setting up the steel support member, reduce the height of steel truss, the vertical rigidity that is supporting structure sidesway integral rigidity, steel truss improves, and the structural entity torsion problem also obtains alleviation to a certain degree.Adopt the air cooling device bracket of the present invention after optimizing can save concrete 30-50%, the steel truss height can reduce 2-3 rice, can save ten thousand yuan of 2000-3000 with a 600MW set structure total cost, reaches the purpose of saving construction costs.While, it transmitted about 45% seismic forces under geological process owing to steel diagonal brace under wind load and geological process is stressed bigger, also should strict slenderness ratio and the member section stress of controlling supporting member in the design of air cooling supporting structure.
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| CN102392499A (en) * | 2011-11-04 | 2012-03-28 | 清华大学 | Anti-buckling support air cooling island structure |
| CN108104487A (en) * | 2018-02-08 | 2018-06-01 | 中冶北方（大连）工程技术有限公司 | Hinged truss is can compensate for expand with heat and contract with cold the device of deformation |
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| CN108104487A (en) * | 2018-02-08 | 2018-06-01 | 中冶北方（大连）工程技术有限公司 | Hinged truss is can compensate for expand with heat and contract with cold the device of deformation |
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| CN101566012B (en) | 2011-01-26 |
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