CN102392499A - Anti-buckling support air cooling island structure - Google Patents

Abstract

The invention relates to an anti-buckling support air cooling island structure which belongs to the technical field of structural engineering. The anti-buckling support air cooling island structure is characterized in that the anti-buckling support air cooling island structure comprises support columns, a steel truss, anti-buckling supports and a connecting cross beam, wherein the steel truss is positioned at the top of the support columns, and the anti-buckling supports are arranged among the support columns of side beams and side spans; one layer or two layers of the anti-buckling supports can be arranged along the height direction according to the height of the support columns; when the one layer of the supports are arranged, the supports are arranged like the shape of V, and the lower ends of the supports are directly connected with a foundation; when the two layers of the supports are arranged, the connecting cross beam is arranged at the middle parts of the support columns, the upper layer of the supports are arranged like the shape of V, the lower layer of the supports are arranged like the shape of inverted V, and the part between the two layers of the supports is connected with the connecting cross beam. The air cooling island structure after the anti-buckling supports are set can not only greatly improve the horizontal lateral stiffness of the structure, but also be very convenient to adjust the stiffness of the structure in a certain direction; and simultaneously, the air cooling island structure can yield in advance under the action of a large earthquake by adjusting the sectional area of the supports, thereby protecting the upper structure and equipment.

Description

A buckling-resistant braced air-cooled island structure

technical field

The invention relates to a novel air-cooling island structure, which belongs to the technical field of structural engineering.

Background technique

The air-cooling structure of a large thermal power plant is a special and complex new industrial building. From the requirements of thermal power generation and other process layout, at present, a "high-legged chicken leg" structure with a rigid top and a soft bottom is generally adopted at home and abroad. The roof adopts steel grids or trusses, and the roof support is steel pipe concrete or concrete pipe columns; Almost all the mass of air-cooling equipment and large fans is concentrated on the roof, and the load on it can reach tens of thousands of tons when only a 300MW unit is used. The most important feature of this type of structure is the poor seismic performance of the structure, especially the difficulty in uniform arrangement of roof equipment and loads, resulting in extremely uneven distribution of mass and stiffness of the structure, which in turn produces structural dynamic performance in which the first vibration mode is torsional mode. , which further stimulates the unfavorable torsional effect of the earthquake on the structure. In addition, due to the use of an independent high chicken leg support structure, it is difficult for the independent support column structure to provide greater lateral stiffness. In order to resist horizontal earthquakes, large-section concrete-filled steel tube columns have to be used, resulting in low lateral efficiency of the structure and bringing material Waste and inconvenience of field concrete pouring wet work.

In order to improve the disadvantages of unfavorable stress state and poor lateral rigidity of this type of structure in earthquakes, the present invention skillfully combines the anti-buckling support with the tall chicken-leg structure, and proposes an air-cooled island structure with anti-buckling support form. In order to effectively improve the natural vibration mode of the structure and prevent excessive torsional deformation, the best arrangement of anti-buckling braces is at the corner of the structure, so it is advisable to set up anti-buckling braces between the corner columns and the adjacent support columns. And adjust the area of anti-buckling supports according to the layout of the structural column network and the degree of uneven distribution of mass and stiffness; in the vertical direction, the number of layers of the anti-buckling supports should be determined according to the height of the support columns, so that the supports can play a more efficient role. lateral force resistance.

Compared with the traditional high-leg chicken-leg type air-cooled island structure, this anti-buckling support air-cooled island structure has the following advantages: (1) It can effectively provide the horizontal anti-lateral stiffness of the structure. The setting of anti-buckling supports improves the horizontal lateral stiffness of the original air-cooled island structure with independent support columns, greatly reduces the cross-section materials of the support columns of the original structure, and saves materials and construction costs; (2) It can effectively adjust the structural stiffness. In the anti-buckling bracing air-cooled island structure, the stiffness of the structure in a certain direction can be effectively changed only by changing the size of the anti-buckling bracing section, and then achieve the purpose of adjusting the overall stiffness of the structure, changing the problem caused by the extremely uneven distribution of mass and stiffness. The torsional effect of the structure makes the first vibration mode of the structure tend to be controlled by the translational vibration mode, which greatly improves the dynamic performance and seismic performance of the structure; (3) the time when the support enters yield can be controlled by adjusting the cross-sectional area of the anti-buckling support, Under the action of moderate and severe earthquakes, the buckling-resistant braces first yield and consume the energy input by the earthquake, while other structures remain within the elastic range, thereby effectively protecting the upper air-cooling equipment and enabling it to resume operation as soon as possible after the earthquake.

Contents of the invention

The invention proposes an air-cooled island structure with anti-buckling support, the purpose of which is to increase the lateral stiffness of the air-cooled island structure, reduce the adverse effects caused by the torsion of the structure, and improve the seismic performance of the structure.

An anti-buckling support air-cooled island structure is characterized in that it is composed of a support column, a steel truss, an anti-buckling support and a connecting beam; the support column is a concrete pipe column or a steel tube concrete pipe column, and the lower end is fixed on the foundation; The above-mentioned steel truss is perpendicular to the top of the support column, and is hingedly connected with the top of the support column, and the upper part of the steel truss is placed on the direct air cooling equipment;

In the above-mentioned anti-buckling support air-cooling island structure, the anti-buckling support is arranged obliquely between the corner support column and another support column adjacent to the corner support column, that is, it is arranged at the side span ; If the height of the support columns is greater than the distance between two adjacent support columns, two layers of anti-buckling supports are arranged along the height direction, otherwise one layer of anti-buckling supports is arranged along the height direction; in each layer of anti-buckling supports, the corner supports Arrange two anti-buckling supports between the column and another support column adjacent to the corner support column; when a layer of anti-buckling supports is arranged, the The two anti-buckling supports arranged between another supporting column adjacent to the column are arranged in a V shape, and the top of each anti-buckling supporting column is connected to the corner supporting column or the other adjacent supporting column at the corner. The top of a support column is connected, while the bottom is directly connected to the foundation; when two layers of anti-buckling supports are arranged, the The four anti-buckling supports are arranged in an X-shaped intersection, and a connecting beam is arranged horizontally between the corner support column and another support column adjacent to the corner support column at the intersection point , the connecting beam is hingedly connected to the corner support column and another support column adjacent to the corner support column, and the two anti-buckling supports on the upper floor are arranged in a V shape, and the top of the support column is connected to the The top of the above-mentioned corner support column or another support column adjacent to the above-mentioned corner support column is connected, and its bottom is connected with the connecting beam, while the two anti-buckling supports on the lower floor are arranged in an inverted V shape, and the top It is connected with the connecting beam, and its bottom is connected with the bottom of the corner supporting column or another supporting column adjacent to the corner supporting column; the connecting beam is made of I-shaped steel, and its connection with the supporting column The joint adopts the following form: two gusset plates protrude from the inside of the supporting column, so that they clamp a plate protruding from the web of the connecting beam, and the two are connected by a pin;

In the above-mentioned anti-buckling bracing air-cooled island structure, at the connection between the buckling-resistant bracing and the supporting column, a cross-shaped gusset plate protrudes from the supporting column, and the cross-shaped end of the buckling-resistant bracing is connected to the cross-shaped node through four connecting plates. The plates are connected using high-strength bolts; at the joint between the anti-buckling brace and the connecting beam, a gusset plate protrudes from the connecting beam, and the cross-shaped ends of the two anti-buckling supports pass through four connecting plates and the node respectively. The board is connected.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of a traditional high-legged chicken-leg type air-cooled island structure.

Fig. 2 is a three-dimensional schematic diagram of an air-cooled island structure with anti-buckling supports, and two layers of anti-buckling supports are arranged along the height direction.

Fig. 3 is a three-dimensional schematic diagram of an air-cooled island structure with anti-buckling supports, and a layer of anti-buckling supports is arranged along the height direction.

Fig. 4 is a schematic elevation view of an air-cooled island structure with anti-buckling supports, in which two layers of anti-buckling supports are arranged along the height direction.

Fig. 5 is a schematic plan view of an anti-buckling support air cooling island structure.

Fig. 6 is a detailed diagram of the connection node at A in Fig. 4, that is, the connection node connecting the beam and the support column.

Fig. 7 is a detailed diagram of the connection node at B in Fig. 4, that is, the connection node between the anti-buckling support and the support column.

Fig. 8 is a detailed diagram of the connection node at point C in Fig. 4, that is, the connection node between the anti-buckling support and the connecting beam.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

1-support columns, including: 1-1, 1-2, 1-3, 1-4-corner support columns;

2- steel truss;

3- Anti-buckling support;

4- connecting beam;

5-1, 5-2, 5-3- gusset plate;

6-1, 6-2, 6-3-stiffeners;

7-pin shaft;

8 - connecting plate;

9-High-strength bolts.

Fig. 1 is the original air-cooled island structure, which is a tall chicken leg structure with weak lateral resistance and large torsional deformation during earthquakes, so the seismic performance is relatively poor; for this reason, the present invention combines the anti-buckling support with the original The air-cooled island structure system is combined to form a buckling-resistant braced air-cooled island structure, as shown in Figure 2. The biggest feature of this new type of air-cooled island structure system is that by adjusting the core cross-sectional area and plane layout of the buckling-resistant braces, the torsional mode of the structure can be effectively avoided. And consume seismic energy, protect the roof steel structure and equipment from damage.

As shown in Figure 2, this anti-buckling support air-cooled island structure is characterized in that it consists of a support column 1, a steel truss 2, an anti-buckling support 3 and a connecting beam 4; the support column 1 is a reinforced concrete column or The lower end of the steel pipe concrete column is fixed on the foundation; the steel truss 2 is perpendicular to the top of the supporting column 1 and is hingedly connected with the top of the supporting column 1;

As shown in Figure 5, the anti-buckling support 3 is arranged obliquely on the corner support column 1-1, 1-2, 1-3, 1-4 and the other adjacent to the corner support column Between the supporting columns, that is, at the side spans; if the height of the supporting column 1 is greater than the distance between two adjacent supporting columns, two layers of anti-buckling supports are arranged along the height direction as shown in Figure 2; otherwise, as shown in Figure 3 It shows that one layer of anti-buckling supports is arranged along the height direction; in each layer of anti-buckling supports, the corner support columns 1-1, 1-2, 1-3, 1-4 and the corresponding corner support columns Two anti-buckling supports are arranged between the other adjacent support columns; when a layer of anti-buckling supports is arranged, as shown in Figure 3, the corner support columns 1-1, 1-2, 1-3, 1-4 The two anti-buckling supports arranged between the other support column adjacent to the corner support column are arranged in a V shape, and the top of each anti-buckling support is connected to the corner support column or to the The top of another support column adjacent to this corner support column is connected, and the bottom is directly connected to the foundation; when two layers of anti-buckling supports are arranged, as shown in Fig. 2 and Fig. The four anti-buckling supports between 1-2, 1-3, 1-4 and the other support column adjacent to the corner support column are arranged in an X-shaped intersection, and at the intersection point, the A connection beam 4 is arranged horizontally between the corner support column and another support column adjacent to the corner support column. The connection beam 4 adopts I-shaped steel, and the connection beam 4 is connected to the The corner support column and another support column adjacent to the corner support column are hingedly connected, and the two anti-buckling supports on the upper floor are arranged in a V shape, and their tops are connected to the corner support column or to the corner support column. The top of another supporting column adjacent to the above-mentioned corner supporting column is connected, and its bottom is connected with the connecting beam 4, while the two anti-buckling supports on the lower floor are arranged in an inverted V shape, and their tops are connected with the connecting beam 4, Its bottom is connected with the bottom of said corner support column or another support column adjacent to said corner support column.

The connection node connecting the beam 4 and the support column 1, that is, the point A in Fig. 4, its structure is specifically shown in Fig. 6, and two gusset plates 5-1 protrude from the inside of the support column 1, so that it clamps the self-connecting A plate protruding from the web of the beam 4, the two are connected by a pin 7, and a stiffener 6-1 is arranged at the end of the connecting beam 4 according to the general practice;

In the above-mentioned anti-buckling support air-cooled island structure, as shown in Figure 7, at the connection between the buckling-resistant support 3 and the support column 1, that is, at B in Figure 4, a cross-shaped gusset plate protrudes from the support column 1 5-2, the cross-shaped end of the anti-buckling support is connected to the cross-shaped gusset plate 5-2 through four connecting plates 8, and high-strength bolts 9 are used for the connection; at the connection between the anti-buckling support 3 and the connecting beam 4, That is, at C in Figure 4, as shown in Figure 8, a gusset plate 5-3 protrudes from the connecting beam 4, and the cross-shaped ends of the two anti-buckling supports pass through four connecting plates 8 and the gusset plate 5 respectively. -2 to realize the connection, and high-strength bolts 9 are used for the connection; in the above two nodes, the stiffeners 6-2 and 6-3 need to be arranged according to the general practice.

Claims (1)

1. an anti-flexing supports the air cooling island structure, it is characterized in that, is supported and links crossbeam and formed by bearing post, steel truss, anti-flexing; Said bearing post is concrete tubing string or steel core concrete column, and the lower end is fixed on the basis; Said steel truss is articulated and connected with the bearing post top perpendicular to the top of bearing post; Said anti-flexing supports oblique being arranged between bight bearing post and another bearing post adjacent with described this bight bearing post; If the height of bearing post greater than the spacing of adjacent two bearing posts, then arranges that along short transverse two-layer anti-flexing supports, otherwise arrange that along short transverse the anti-flexing of one deck supports; In every layer of anti-flexing supports, between bight bearing post and another bearing post adjacent, arrange that two anti-flexings support with described this bight bearing post; When arranging that the anti-flexing of one deck supports; Two anti-flexings of between bight bearing post and another bearing post adjacent with described this bight bearing post, arranging support V-shaped layout; The top of the top that every anti-flexing supports and said bight bearing post or another bearing post adjacent with described this bight bearing post links to each other, and the bottom directly and basic the connection; When arranging that two-layer anti-flexing supports; Four anti-flexings between said bight bearing post and another bearing post adjacent with described this bight bearing post support and are the X-shaped arranged crosswise; And be in said bight bearing post in the crosspoint and between another adjacent bearing post of described this bight bearing post along continuous straight runs arrange and link crossbeam; Saidly link crossbeam and said bight bearing post and all be articulated and connected with another adjacent bearing post of described this bight bearing post; Two anti-flexings on upper strata support V-shaped layout; The top of its top and said bight bearing post or another bearing post adjacent with described this bight bearing post links to each other, its bottom with link crossbeam and link to each other, and two anti-flexings of lower floor support and are the inverted V-shaped layout; Its top with link crossbeam and link to each other, the bottom of its bottom and said bight bearing post or another bearing post adjacent with described this bight bearing post links to each other.

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