CN103397740A

CN103397740A - Three-dimensional beam string structure

Info

Publication number: CN103397740A
Application number: CN2013103374172A
Authority: CN
Inventors: 蔡建国; 丁一凡; 冯健
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2013-08-05
Filing date: 2013-08-05
Publication date: 2013-11-20
Anticipated expiration: 2033-08-05
Also published as: CN103397740B

Abstract

The invention discloses a space tension beam structure. The two plane structures adjacent to each other and not located in the same tension beam structure are a corresponding set of P planes and N planes, and are arranged between the set of P planes and N planes. There are several oblique cables, and the oblique cables are arranged obliquely relative to the purlins, one end of which is hinged to the upper string beam on the P surface, and the other end is fixedly connected to the lower end of the strut on the N surface. Compared with the prior art, the space string beam structure provided by the present invention increases the use of diagonal cables. After the purlins fail, the integrity of the entire structure will not be affected due to the connection relationship between the diagonal cables and the adjacent string string structures. It disappears immediately, which improves the collapse resistance performance, prevents continuous collapse, eliminates potential safety hazards, and greatly enhances the integrity of the structure; in addition, the oblique cables effectively prevent the failure of the cables on the lower chord side of the existing string beam structure. out-of-plane instability.

Description

A kind of Spatial Beam String Structure

Technical field

The present invention relates to a kind of Spatial Beam String Structure, belong to a kind of building structure.

Background technology

The application of field of civil engineering large-span steel is more and more at present.But sharply strengthen along with span increases deadweight, structure faces the contradiction of using function, design rationality and economic indicator mutually to restrict.Improve the rigidity of structure for the use function that meets structure reduces dead load simultaneously, the prestressing force beam string structure of being furnished with drag-line more and more is applied in large-span steel.By the layout of prestressed cable and strut, the bearing capacity of large-span steel and rigidity have had very large improvement.

As shown in Figure 1, existing Spatial beam string structure, comprise tension string beam structure and purlin 5 that some Pin parallel interval are arranged, as shown in Figure 2, every Pin tension string beam structure comprises a pair of beam 1(or arch or the truss of winding up), some to strut 3 and a pair of lower edge drag-line 2, the described paired beam 1 that winds up, paired strut 3 and paired lower edge drag-line 2 are arranged symmetrically in the both sides of this plane of symmetry with respect to a plane of symmetry, the beam 1 that winds up, strut 3 and the lower edge drag-line 2 that are positioned at this plane of symmetry the same side form a face structure; In same structure, the two ends of lower edge drag-line 2 are fixed with the two ends of the drag-line 1 that winds up respectively, and the upper end of described strut 3 is hinged with the beam 1 that winds up, and the lower end of strut 3 is fixedly connected with lower edge drag-line 2; The lower end that is arranged in two paired struts 3 of two face structures is fixedly connected with two lower edge drag-lines 2 respectively by two cord clip tools 4; Described purlin 5 is along tension string beam structure arragement direction layout and perpendicular to the described plane of symmetry, and the two ends of purlin 5 are hinged with the two Pin tension string beam structures that are positioned at two ends respectively; Lower edge drag-line 2 after stretch-draw forms the broken line of axial symmery shape, and the beam 1 that winds up, strut 3 and lower edge drag-line 2 form self equilibrium systems, lower edge drag-line 2 tensions, and strut 3 is pressurized two power bars, the beam 1 that winds up is bending component.

In said structure, the prestressing force of lower edge drag-line 2 makes tension string beam structure produce allowance for camber, therefore the final amount of deflection of tension string beam structure under load action can reduce, and the stretching force by lower edge drag-line 2, make strut 3 produce component upwards, the beam 1 that causes winding up produce with the external load effect under opposite internal force and distortion, to form whole tension string beam structure and to improve the rigidity of structure, 3 pairs of Moment resistant Elements of strut provide resiliency supported, improve the latter's stress performance; When if bending component is taken as arch, born the horizontal thrust of arch by lower edge drag-line 2, alleviate the burden that arch produces bearing, therefore should take necessary temporary transient or permanent construction measure at the bearing place, form self equilibrium systems in roofing load actions such as (refer under) deadweights under top stress and external load effect, do not produce horizontal thrust; Simultaneously, the existence of lower edge drag-line 2 can reduce greatly the to wind up cross section of beam 1, improve the supporting capacity of total.The existence of purlin 5 can be linked to be each Pin tension string beam structure an integral body, strengthens the globality of tension string beam structure, and simultaneously, the calculated length while reducing single Pin tension string beam structure pressurized, can increase the span of whole tension string beam structure.At this moment,, if purlin 5 in use occurs destroying fracture, lost contact between each Pin tension string beam structure, single Pin tension string beam structure bears external load may, because the Lack of support failure lost efficacy, continuous collapse may occur.

Summary of the invention

Goal of the invention:, in order to overcome the deficiencies in the prior art, the invention provides a kind of Spatial Beam String Structure that the purlin inefficacy causes the globality of total to be lost immediately afterwards of in use can avoiding appearing at.

Technical scheme: for achieving the above object, the technical solution used in the present invention is:

A kind of Spatial Beam String Structure, comprise tension string beam structure and purlin that some Pin parallel interval are arranged, every Pin tension string beam structure comprises a pair of beam that winds up, some to strut and a pair of lower edge drag-line, the described paired beam that winds up, paired strut and paired lower edge drag-line are arranged symmetrically in the both sides of this plane of symmetry with respect to a plane of symmetry, the beam that winds up, strut and the lower edge drag-line that are positioned at this plane of symmetry the same side form a face structure; In same structure, the two ends of lower edge drag-line are fixed with the two ends of the drag-line that winds up respectively, and the upper end of described strut is hinged with the beam that winds up, and the lower end of strut is fixedly connected with the lower edge drag-line; The lower end that is arranged in two paired struts of two face structures is fixedly connected with two lower edge drag-lines respectively by two cord clip tools; Described purlin is along tension string beam structure arragement direction layout and perpendicular to the described plane of symmetry, and the two ends of purlin are hinged with the two Pin tension string beam structures that are positioned at two ends respectively; Remember that adjacent and two face structures not being arranged in same Pin tension string beam structure are corresponding one group of P face and N face, be furnished with some oblique cables between described one group of P face and N face, described oblique cable is in tilted layout with respect to purlin, and the one end is hinged with the beam that winds up of P face, the other end is fixedly connected with the strut lower end of N face.

This case is with respect to prior art, increased the use of oblique cable, after purlin lost efficacy, due to the annexation between oblique cable and adjacent tension string beam structure, make the globality of total can not disappear at once, improved the anti-fall performance of collapsing, can prevent Progressive Collapse, eliminate safe hidden trouble, also can greatly strengthen the globality of structure simultaneously.In addition, the out-of-plane unstability of appearance after oblique cable has effectively stoped existing tension string beam structure lower edge one layback rope to lose efficacy.

Preferably, the hinged position of described oblique cable and the beam that winds up of P face comprises and only comprises in this P face wind up position that beam is fixedly connected with the lower edge drag-line and wind up beam and the hinged position of strut.

More preferred, will wind up respectively beam and lower edge drag-line of strut is divided into the n section, and total n+1 node, remember that the node on the beam that winds up is followed successively by: u ₀, u ₁..., u _n-1, u _n, the node of writing down on the string drag-line is followed successively by: d ₀, d ₁, d _i..., d _n-1, d _nIn same structure, described node u ₀With node d ₀For same node, described node u _nWith node d _nFor same node; The oblique cable link position of arranging between described one group of P face and N face is d _iu _i-1And d _iu _i+1, wherein i be 1,2 ..., n-1.。

More preferred, be positioned at two ends all tension string beam structures in addition, two face structures of every Pin tension string beam structure are simultaneously as the P face or simultaneously as the N face.

More preferred, the described pair of cord clip tool be the fixing short drag-line lower end on same position simultaneously.

Preferably, described lower edge drag-line forms the broken line of axial symmery shape, and adjacent fold line forms a broken line angle, and each turning point of broken line is positioned on same parabola.

Beneficial effect: Spatial Beam String Structure provided by the invention, with respect to prior art, increased the use of oblique cable, after purlin lost efficacy,, due to the annexation between oblique cable and adjacent tension string beam structure, make the globality of total can not disappear at once, improved the anti-fall performance of collapsing, can prevent Progressive Collapse, eliminate safe hidden trouble, also can greatly strengthen the globality of structure simultaneously; In addition, the out-of-plane unstability of appearance after oblique cable has effectively stoped existing tension string beam structure lower edge one layback rope to lose efficacy.

Description of drawings

Fig. 1 is the structural representation of prior art;

Fig. 2 is single Pin tension string beam structure schematic diagram;

Fig. 3 is structural representation of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing, the present invention is further described.

Be illustrated in figure 3 as a kind of tension string beam structure schematic diagram based on inventive concept, comprise tension string beam structure and purlin (5) that some Pin parallel interval are arranged, every Pin tension string beam structure comprises a pair of beam that winds up (1), some to strut (3) and a pair of lower edge drag-line (2), the described paired beam that winds up (1), paired strut (3) and paired lower edge drag-line (2) are arranged symmetrically in the both sides of this plane of symmetry with respect to a plane of symmetry, the beam that winds up (1), strut (3) and the lower edge drag-line (2) that are positioned at this plane of symmetry the same side form a face structure; In same structure, the two ends of lower edge drag-line (2) are fixed with the two ends of the drag-line that winds up (1) respectively, and the upper end of described strut (3) is hinged with the beam (1) that winds up, and the lower end of strut (3) is fixedly connected with lower edge drag-line (2); The lower end that is arranged in paired two struts (3) of two face structures is fixedly connected with two lower edge drag-lines (2) respectively by two cord clip tools (4); Described purlin (5) is along tension string beam structure arragement direction layout and perpendicular to the described plane of symmetry, and the two ends of purlin (5) are hinged with the two Pin tension string beam structures that are positioned at two ends respectively; Remember that adjacent and two face structures not being arranged in same Pin tension string beam structure are corresponding one group of P face and N face, be furnished with some oblique cables (6) between described one group of P face and N face, described oblique cable (6) is in tilted layout with respect to purlin (5), and the one end is hinged with the beam that winds up (1) of P face, the other end is fixedly connected with strut (3) lower end of N face.

To wind up respectively beam (1) and lower edge drag-line (2) of strut (3) is divided into the n section, and total n+1 node, remember that the node on the beam (1) that winds up is followed successively by: u ₀, u ₁..., u _n-1, u _n, the node of writing down on string drag-line (2) is followed successively by: d ₀, d ₁, d _i..., d _n-1, d _nIn same structure, described node u ₀With node d ₀For same node, described node u _nWith node d _nFor same node; Oblique cable (6) link position of arranging between described one group of P face and N face is d _iu _i-1And d _iu _i+1, wherein i be 1,2 ..., n-1.Simultaneously, be positioned at two ends all tension string beam structures in addition, two face structures of every Pin tension string beam structure are simultaneously as the P face or simultaneously as the N face.

Described pair of cord clip tool (4) be fixing short drag-line (5) lower end on same position simultaneously.

The hinged position of described oblique cable (6) and the beam that winds up (1) of P face comprises and only comprises in this P face position and the beam (1) that the winds up position hinged with strut (3) that beam (1) is fixedly connected with lower edge drag-line (2) of winding up.

Lower edge drag-line 2 after stretch-draw forms the broken line of axial symmery shape, and the beam 1 that winds up, strut 3 and lower edge drag-line 2 form self equilibrium systems, lower edge drag-line 2 tensions, and strut 3 is pressurized two power bars, the beam 1 that winds up is bending component; Lower edge drag-line 2 forms the broken line of axial symmery shape, and adjacent fold line forms a broken line angle, and each turning point of broken line is positioned on same parabola.

Implementation procedure: at first utilize tension string beam structure operational phase lower edge drag-line 2 shapes in the computer simulation prior art, then increase oblique cable 6, at strut 3, lower edge drag-line 2, purlin 5, each oblique cable 6, the position of cord clip tool 4 is all calculated the internal force of lower edge drag-line 2 and each oblique cable 6 final (operational phases) in constant situation, and the variation of internal force changes to compensate by the internal force of cord clip tool 4.

Lower edge drag-line 2 and each oblique cable 6 are installed and fixedly during strut 3, cord clip tool 4 firmly is fixed on lower edge drag-line 2 and the corresponding calibration position of each oblique cable 6.After the work progress such as stretch-draw, installation and various where applying, strut 3 and lower edge drag-line 2 and each oblique cable 6 just are in the state (position of all members is all identical with each member position of opening the string beam under existing technology) of design expectation.On the basis of this processing mode, adopt an effective measure and increase the friction factor of 4 of lower edge drag-line 2 and each oblique cable 6 and cord clip tools as far as possible, as safety stock, so that lower edge drag-line 2 and each oblique cable 6 in a string beam are in stable state all the time.

The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1. A string string structure in space, including several string string structures and purlins (5) arranged in parallel at intervals, each string string structure includes a pair of upper string beams (1), several pairs of braces (3) and a pair of lower string stay cables ( 2), the paired upper chord beams (1), the paired struts (3) and the paired lower chord cables (2) are symmetrically arranged on both sides of a symmetric plane relative to the symmetric plane, located on the symmetrical The upper chord beam (1), struts (3) and lower chord cables (2) on the same side of the surface form a surface structure; in the same surface structure, the two ends of the lower chord ) are fixed at both ends, the upper end of the strut (3) is hinged with the upper chord beam (1), and the lower end of the strut (3) is fixedly connected with the lower chord cable (2); the paired The lower ends of the two struts (3) are respectively fixedly connected to the two lower string cables (2) through a double-cable clamp (4); the purlins (5) are arranged along the arrangement direction of the string beam structure and are perpendicular to the symmetry plane , the two ends of the purlin (5) are respectively hinged to the two string string structures located at the two ends; it is characterized in that the two surface structures that are adjacent and not located in the same string string structure are recorded as a corresponding set of P faces and N faces, A number of oblique cables (6) are arranged between the set of P surfaces and N surfaces, and the oblique cables (6) are arranged obliquely relative to the purlins (5), and one end of the oblique cables (6) is connected to the upper chord beam (1) of the P surface Hinged, the other end is fixedly connected with the lower end of the strut (3) on the N surface.

2. The space string string structure according to claim 1, characterized in that: the position where the oblique cable (6) is hinged to the top run beam (1) on the P plane includes and only includes the top run beam (1) on the P plane The position fixedly connected with the lower chord cable (2) and the hinged position of the upper chord beam (1) and the strut (3).

3. The space tension beam structure according to claim 1, characterized in that: the struts (3) respectively divide the upper string beam (1) and the lower string cable (2) into n sections, and there are n+1 nodes in total, record the upper string beam The nodes on (1) are: u ₀ , u ₁ , …, u _n-1 , u _n , and the nodes on the string cable (2) are: d ₀ , d ₁ , d _i , …, d _n-1 , d _n ; in the same plane structure, the node u ₀ and the node d ₀ are the same node, and the node u _n and the node d _n are the same node; in the group of P planes and N planes The connection positions of the oblique cables (6) arranged between them are d _i u _i-1 and d _i u _i+1 , where i is 1, 2, ..., n-1.

4. The space string string structure according to claim 3, characterized in that: for all string string structures located at both ends, the two surface structures of each string string structure serve as the P surface or the N surface at the same time.

5. The space string string structure according to claim 1, 2, 3 or 4, characterized in that: the double-cable clamp (4) simultaneously fixes the lower ends of the short stay cables (5) at the same position.

6. The space string beam structure according to claim 1, characterized in that: the lower string cables (2) form an axisymmetric broken line, adjacent broken lines form a broken line angle, and each turning point of the broken line is located on the same parabola.