CN107190876A - A kind of Ripple Sternum buckling restrained brace - Google Patents

Abstract

The invention discloses a corrugated web H-shaped steel buckling restraint support, which includes a core unit, a constraint unit and a sliding mechanism unit; the core unit includes a corrugated web H-shaped steel and a flat web H-shaped steel; the corrugated web H-shaped steel corrugated web The cross-section of the plate is corrugated, and the two ends of the corrugated web H-shaped steel are fixedly connected with the flat web H-shaped steel used for section reinforcement to form a whole; the constraint unit is a cavity set around the core unit, and concrete is poured into the cavity; The flat web H-shaped steel at both ends of the core unit passes through the two ends of the cavity; the sliding mechanism unit includes unbonded expandable material wrapped on the surface of the core unit. The invention can meet the requirement of higher bearing capacity; the restraining effect is better; the burden of the outer sleeve can be reduced, the cross section of the sleeve can be reduced, the economy can be improved, the cost can be reduced, and at the same time, the self-weight of the buckling restraint support can be properly reduced.

Description

A Buckling Constrained Brace of Corrugated Web H-Shaped Steel

technical field

The invention relates to a building damping device, in particular to a corrugated web H-shaped steel buckling restraint support.

Background technique

Buckling-restrained braces are a common energy-dissipating and shock-absorbing component, which can yield before the main structure under small earthquakes. With its superior hysteresis performance, it can fully dissipate seismic energy and is widely used in engineering structures.

The working mechanism of the buckling restrained brace is that the core steel brace provides bearing capacity, and the outer sleeve provides lateral restraint to avoid buckling instability of the core unit before yielding. Compared with ordinary steel supports, since the stability coefficient is not considered under compression conditions, the cross-sectional utilization of members can be improved to a certain extent. However, since the outer sleeve does not provide bearing capacity, the section utilization is not ideal for the member as a whole.

The core unit form of the buckling-restrained brace is a process of continuous development, from the initial straight-shaped steel plate to the later cross-shaped and H-shaped steel, which can meet different bearing capacity requirements. For different bearing capacity ranges, the selection of the core unit type mainly considers the requirements of overall stability and economy: the overall stability requires the outer sleeve section to be stretched outwards, and the size is enlarged; the economy requires the outer sleeve section to be closed inwards, and the size is reduced , thus increasing the section utilization. Generally, for buckling restrained supports with a bearing capacity greater than 400t, it is more economical to choose H-shaped steel, because compared with in-line steel plates and cross-shaped core materials, H-shaped steel has the following advantages:

(1) The H-shaped steel has a higher stability coefficient, which can reduce the burden on the outer sleeve and reduce the sleeve section;

(2) The contact surface between the H-shaped steel and the restraint system is larger, and the restraint effect is better;

(3) When other parameters are the same, the core unit is made of H-shaped steel, which has better overall stability.

With the application and popularization of buckling-constrained braces, the existing cross-section forms cannot meet more diversified design requirements. For example, for higher bearing capacity requirements, a new core element form is needed to further improve the cross-sectional utilization of members .

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a corrugated web H-shaped steel buckling-constrained support, which has high bearing capacity, can reduce the cross section of the sleeve, and has good economy and low cost.

The present invention is achieved through the following technical solutions:

A corrugated web H-shaped steel buckling-restrained support, including a core unit, a restraint unit and a sliding mechanism unit;

The core unit includes corrugated web H-shaped steel and flat web H-shaped steel; the cross section of the corrugated web H-shaped steel is corrugated, and the two ends of the corrugated web H-shaped steel are respectively connected with the flat web H-shaped steel used for section reinforcement. fixedly connected to form a whole;

The constraint unit is a cavity set around the core unit, and concrete is poured into the cavity; the flat web H-shaped steel at both ends of the core unit passes through the two ends of the cavity;

The sliding mechanism unit includes an unbonded expandable material wrapped around the surface of the core unit.

Preferably, the connecting end of the flat web H-shaped steel is welded and fixed as a terminal assembly; the corrugated web H-shaped steel is welded and fixed with the end assembly;

The corrugated web of the corrugated web H-shaped steel is welded and fixed to the connecting plate, and the flange of the corrugated web H-shaped steel is welded and fixed to the flange of the flat web H-shaped steel; the width of the connecting plate is greater than the corrugation amplitude of the corrugated web H-shaped steel.

Further, the width of the flange of the flat web H-shaped steel is larger than that of the corrugated web H-shaped steel, and the connecting end flange of the corrugated web H-shaped steel is inserted and welded into the connecting end flange of the flat web H-shaped steel.

Still further, the flange end of the connecting end of the H-shaped steel of the flat web is arranged on an inclined plane, and the side close to the H-shaped steel of the corrugated web is higher than the side away from the H-shaped steel of the corrugated web.

Still further, a first compressible material is provided on the flange end of the connecting end of the flat web H-shaped steel, and a second compressible material is provided on the side of the connecting plate where the corrugated web is welded.

Still further, the first compressible material is made of soft polyurethane foam, and the second compressible material is made of soft polyurethane foam.

Preferably, the limit clips are respectively welded on both sides of the middle part of the corrugated web H-shaped steel of the corrugated web.

Preferably, the constraining unit includes a square outer sleeve, sealing end plates welded to both ends of the square outer sleeve, and lifting rings fixed to the sides of the square outer sleeve.

Preferably, the corrugated web H-shaped steel is made of low yield point steel.

Preferably, the unbonded expandable material is biaxially oriented polypropylene film.

Compared with the prior art, the present invention has the following beneficial technical effects:

The corrugated web H-shaped steel buckling restraint support of the present invention can meet higher bearing capacity requirements; compared with the flat web H-shaped steel, the contact surface between the corrugated web H-shaped steel with a corrugated cross section and the restraint system is larger , which is equivalent to enlarging the constraining surface, increasing the constraining capacity, increasing the cross-sectional utilization of constraining parts, and the constraining effect is better; at the same time, the corrugated web H-shaped steel has excellent out-of-plane rigidity, buckling resistance capacity, and high self-stability coefficient , can reduce the burden on the outer sleeve and reduce the cross section of the sleeve. The economy is improved, the cost is reduced, and at the same time, the self-weight of the buckling-constrained support can be appropriately reduced. When other parameters are the same, the core unit uses H-shaped steel with corrugated webs, which has better overall stability and provides designers with more cross-section options.

Further, the connection section of the corrugated web H-shaped steel is reinforced by arranging flat web H-shaped steel at both ends of the corrugated web H-shaped steel, so as to ensure that the corrugated web H-shaped steel remains elastic after yielding and dissipating energy.

Further, the integrality and stability of the connection structure of the corrugated web H-shaped steel and the flat web H-shaped steel are guaranteed through the provided connecting plate and plug-in inlaid welding.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the buckling-constrained support in the example of the present invention.

Fig. 2 is a three-dimensional structural schematic diagram of the casing restricting component in the example of the present invention.

Fig. 3 is a schematic diagram of the three-dimensional structure of the core material in the example of the present invention.

FIG. 4 is a longitudinal sectional view of FIG. 3 .

Fig. 5 is a sectional view of A-A of Fig. 4 .

Fig. 6 is a B-B sectional view of Fig. 4 .

Fig. 7 is a C-C sectional view of Fig. 4 .

Fig. 8 is a schematic diagram of the three-dimensional exploded structure of the core material described in the example of the present invention.

Fig. 9 shows the critical load under the first-order buckling mode of the flat web H-shaped steel in the prior art.

Fig. 10 is the critical load under the first-order buckling mode of the corrugated web H-shaped steel described in the example of the present invention.

In the figure: 1-square outer sleeve; 2-sleeve sealing end plate; 3-lifting ring; 4-corrugated web H-shaped steel; 5-flat web H-shaped steel; 6-connecting plate; 7-first compressible Material; 8-second compressible material; 9-limit card; 10-unbonded expandable material; 11-concrete.

detailed description

The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

A corrugated web H-shaped steel buckling-constrained support of the present invention is a corrugated web H-shaped steel energy-dissipating core buckling-constrained support for building energy dissipation and shock absorption, as shown in Figures 1 and 4, including a core unit and a restraint unit and sliding mechanism unit.

The core unit, that is, the core material, as shown in FIG. 3 and FIG. 4 , includes corrugated web H-shaped steel 4 and flat web H-shaped steel 5 . The corrugated web H-shaped steel 4 and the flat web H-shaped steel 4 used for cross-section reinforcement at both ends are connected as a whole through connecting plates. The corrugated web H-shaped steel 4 is made of steel with a low yield point to ensure that the buckling-constrained support yields and consumes energy under repeated loads. The cross-section is shown in Figure 7. In this preferred example, a sine wave is used, but trapezoidal waves and rectangular waves can also be used, which are straight lines on the section parallel to the wing plate. The flat web H-shaped steel 5 is respectively arranged at both ends of the corrugated web H-shaped steel 4, which is a cross-sectional reinforcement section supported by buckling restraint, so as to ensure that the corrugated web H-shaped steel 4 remains elastic after yielding and dissipating energy. The cross-section of flat web H-beam 5 is shown in Figure 5, and the cross-section of the connection is shown in Figure 6. Since there is generally a certain inclination angle after the support of the core unit is installed, the members of the constrained unit will slide down due to gravity, so the corrugated The two sides of the middle part of the corrugated web of the web H-shaped steel 4 are respectively welded with limit clips 9, thereby being able to support in the poured concrete 11 and prevent the support from slipping off.

The constraining unit is a square outer sleeve 1, as shown in Fig. 2 and Fig. 4, the inside is poured with concrete, the sleeve sealing end plate 2 is welded at both ends, and the lifting ring 3 is welded on the side, and the lifting ring 3 is arranged symmetrically.

The sliding mechanism unit is an unbonded expandable material 10 wrapped on the surface of the core unit, which can effectively reduce or eliminate the shear force between the constrained units of the core material, and prevent the constrained unit components from bearing axial force and affecting the restraint performance.

Specifically, as shown in FIG. 8 , a limit clip 9 is welded in the middle of the corrugated web H-shaped steel 4 to prevent the core unit used for support from slipping. The flat web H-shaped steel 5 is welded to the connecting plate 6 as an end assembly. Then the corrugated web H-shaped steel 4 is welded to the end assembly, that is, the corrugated web is welded to the connecting plate 6, and its flange is welded and fixed corresponding to the flange inserted into the flat web H-shaped steel 5, thereby forming a U-shaped welding surface. Connection strength and integrity. The width of the connecting plate 6 is greater than the corrugation amplitude of the corrugated web H-shaped steel 4 to ensure welding. The first and second compressible materials 7 and 8 are respectively placed on the flat web H-shaped steel 5 and the connecting plate 6, the first compressible material 7 can be made of soft polyurethane foam, and the second compressible material 8 can be made of soft polyurethane foam Cotton, the second compressible material 8 is arranged on both sides of the connecting end of the H-shaped steel 4 of the corrugated web. The connecting plate 6 is a rectangular steel plate.

Wrapping the non-adhesive material 10 outside the core material can adopt biaxially stretched polypropylene film. Avoid constraining members bearing axial force and affecting restraint performance.

Weld the lifting ring 3 on one side of the square outer sleeve 1, weld the sleeve sealing end plate 2 at one end, put in the core material, pour concrete 11, and then weld the sleeve sealing end plate 2 at the other end.

Fig. 9 and Fig. 10 are a calculation example of the critical load under the first-order buckling mode of H-shaped steel with flat web and H-shaped steel with corrugated web, respectively. Among them, the critical load under the first-order buckling mode of H-beam with flat web is 0.149×10 ⁸ N, and the critical load under the first-order buckling mode of I-beam with corrugated web is 0.160×10 ⁸ N. It shows that under the same parameters, the H-beam with corrugated web is more stable than the H-beam with flat web. Use it for buckling constrained braces to get better results.

The above is only a further description of the present invention, and is not intended to limit this patent. All equivalent implementations of the present invention should be included in the scope of claims of this patent.

Claims (10)

1. a kind of Ripple Sternum buckling restrained brace, it is characterised in that including core cell, constraint element and skate machine Unit processed；

The core cell includes the peaceful web H shaped steel (5) of Ripple Sternum (4)；The ripple abdomen of Ripple Sternum (4) Plate cross section is corrugated, the fixed company of flat web H shaped steel (5) of Ripple Sternum (4) two ends respectively with strengthening for section Connect to form an entirety；

Concrete perfusion (11) in the cavity that the constraint element is set for encirclement core cell, cavity；Core cell two ends Flat web H shaped steel (5) is set through cavity two ends；

Described sliding mechanism unit is wrapped in the soap-free emulsion polymeization expandable material (10) on core cell surface.

2. a kind of Ripple Sternum buckling restrained brace according to claim 1, it is characterised in that the flat web H The connection end of shaped steel (5) is welded and fixed connecting plate (6) as head assemblies；Ripple Sternum (4) and head assemblies welding are solid It is fixed；

The corrugated web of Ripple Sternum (4) is welded and fixed with connecting plate (6), and the edge of a wing of Ripple Sternum (4) is with putting down The edge of a wing of web H shaped steel (5) is welded and fixed；The width of connecting plate (6) is more than the ripple magnitude of Ripple Sternum (4).

3. a kind of Ripple Sternum buckling restrained brace according to claim 2, it is characterised in that the flat web H The flange width of shaped steel (5) is more than the edge of a wing of Ripple Sternum (4), the connection end edge of a wing insertion of Ripple Sternum (4) In the connection end edge of a wing for being welded on flat web H shaped steel (5).

4. a kind of Ripple Sternum buckling restrained brace according to claim 3, it is characterised in that flat web H shaped steel (5) connection end top flange is set in inclined-plane, is higher than close to the side of Ripple Sternum (4) away from Ripple Sternum (4) side.

5. a kind of Ripple Sternum buckling restrained brace according to claim 3, it is characterised in that flat web H shaped steel (5) side for welding corrugated web on the first compressible material (7), connecting plate (6) is set to set on connection end top flange Second compressible material (8).

6. a kind of Ripple Sternum buckling restrained brace according to claim 5, it is characterised in that first is compressible Material (7) is continuous using flexible polyurethane foams, and the second compressible material (8) is continuous using flexible polyurethane foams.

7. a kind of Ripple Sternum buckling restrained brace according to claim 1, it is characterised in that so in ripple Limiting card (9) is respectively welded in both sides in the middle part of the corrugated web of web H shaped steel (4).

8. a kind of Ripple Sternum buckling restrained brace according to claim 1, it is characterised in that the constraint list Member includes square outer sleeve (1), is welded on the sealing end plate (2) at square outer sleeve (1) two ends, and square outer sleeve (1) side The hoisting ring (3) that face is fixed.

9. a kind of Ripple Sternum buckling restrained brace according to claim 1, it is characterised in that the ripple abdomen Plate H profile steel (4) is made of low-yield steel.

10. a kind of Ripple Sternum buckling restrained brace according to claim 1, it is characterised in that the soap-free emulsion polymeization Expandable material (10) uses bidirectional stretching polypropylene film.