CN101220616B - Reinforced steel sleeve buckling restrained brace - Google Patents

Abstract

The invention relates to an improved flection-restraining support member which includes: a core part, an inner sleeve part, an outer sleeve; wherein, the core part consists of a core board and a ribbed stiffener for the core board; the inner sleeve part consists of an inner sleeve wallboard, an inner sleeve ribbed stiffener and a core board restraining board, the outermost layer is the outer sleeve; no clearance is left between the core board restraining board and the core board. The invention also provides a method for manufacturing the improved flection-restraining support member. The flection-restraining support has good returning-delaying characteristics and energy-consuming performance and is an effective energy-consuming member, which can reach 1/70 deformation amount, meet the 1/50 floor displacement distortion requirement of building under rarely-happen earthquake and can greatly improve the earthquake resistance of the building structure; furthermore, the material and manufacture are all realized in China, which greatly reduces the cost of the support and lays a foundation for generalization and application.

Description

Bracing steel sleeve flection restriction support component

Technical field

The invention belongs to building field, be specifically related to buckling-restrained bracing member.

Background technology

In recent years, buckling-restrained support can not take place because of it bears axial compression that flexing, tension and compression bearing are suitable, hysteresis loop is full, have advantages such as good energy dissipation capacity and low cycle fatigue property, is quite favored in the highrise building of the U.S., Japan, China Taiwan etc.The U.S. is after Northridge earthquake in 1994, begin to carry out the research of buckling-restrained support steel structure system, built up the building that first in the U.S. uses buckling-restrained support as lateral resistant member in 2000, surplus the structure of the buckling-restrained support of use of having built up or building at present reaches 30; Japan is a large amount of after the nineteen ninety-five Kobe earthquake to use buckling-restrained support system, at present surplus this type of building existing 250.A lot of achievements are being obtained aspect the research of buckling-restrained support and the use in China Taiwan.

The core of the U.S., the used buckling-restrained braced structures of Japan is all made with low surrender steel, and high-quality low-yield steel need be provided in batches, the technical requirements height, and Q235 and above carbon steel and the higher low-alloy steel of intensity thereof, and the Q195 steel can not be suitable for.

Summary of the invention

The object of the present invention is to provide a kind of buckling-restrained bracing member of with low cost, superior performance.

In order to achieve the above object, technical scheme of the present invention is as follows:

A kind of improved buckling-restrained bracing member, comprise: core part, inner sleeve part, outer sleeve, wherein the core part is made up of central layer and central layer stiffening rib, and the inner sleeve part is made up of inner sleeve wallboard, inner sleeve stiffening rib and central layer restraining plate, and outermost layer is an outer sleeve; There is not the gap between this central layer restraining plate and the central layer.

Further: do not have the gap between this sleeve ends shrouding and the central layer stiffening rib.

(for example 100～200mm) add an inner sleeve stiffening rib every a determining deviation on this inner sleeve wallboard.

The preparation method of above-mentioned improved buckling-restrained bracing member may further comprise the steps:

(1) central layer stiffening rib and central layer are welded together with butt weld;

(2) central layer restraining plate and inner sleeve wallboard are welded together with fillet weld;

(3) the inner sleeve wallboard that will weld the central layer restraining plate carries out assembly unit;

(4) assembly unit is good inner sleeve wallboard welds together with butt weld;

(5) inner sleeve stiffening rib and inner sleeve wallboard are welded together with fillet weld;

(6) again the outer sleeve wallboard is carried out assembly unit;

(7) assembly unit is good outer sleeve wallboard welds together with butt weld.

The constraint surrender section of buckling-restrained support central layer of the present invention adopts in-line, and sleeve adopts square or rectangular steel pipe, a pair of parallel sided of in-line central layer and sleeve pipe.There is not packing material between sleeve and the central layer.Central layer is selected homemade mild steel for use with material, as Q195 steel, Q235 steel and homemade low surrender steel.

1, the requirement of strength of buckling-restrained support

The tension of buckling-restrained support and pressurized surrender bearing capacity F _dCan be expressed as follows:

F _d＝R _yf _yA ₁ (1)

In the formula: F _d---axial tension and Ultimate Compressive Strength.

P _y---axial tension and pressurized yield strength.

R _y---the superpower coefficient of central layer steel.

f _y---central layer yield strength standard value just now.

A ₁---the section area of constraint surrender section.

2, the designing requirement of sleeve

Complete buckling should not take place in buckling-restrained bracing member under frequently occurred earthquake and rarely occurred earthquake effect.The integral, flexible flexing load of buckling-restrained bracing member should satisfy with the ratio of the surrender bearing capacity of constraint surrender section:

$\frac{{\mathrm{\&pi;}}^{2}E{I}_1}{{\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="S2008100330699E00011.png"\; state="\{\{state\}\}">l</figure-callout>}}^2}/{\mathrm{\&omega;F}}_d\&GreaterEqual;1.2---\left(2\right)$

In the formula: I ₁---the integral rigidity of sleeve.

E---sleeve steel modulus of elasticity.

L---bearing length.

Coefficient is adjusted in ω---strain hardening.

Cripling should not take place in the plate of buckling-restrained bracing member under frequently occurred earthquake and rarely occurred earthquake effect.The overhanging flakiness ratio of plate of not having the non-surrender section of constraint (linkage section) should satisfy:

$\frac{b}{t}\&le;13\sqrt{\frac{235}{f_y}}---\left(3\right)$

B, t in the formula---there are not the overhanging width and the thickness of the non-surrender section of constraint steel plate;

3, design of node

During design of node except that considering by the design of node requirement, also should consider to support press draw bearing capacity ratio, material is superpower and the influence of effect such as strain hardening.

The novel buckling-restrained bracing member of the present invention, can adopt homemade mild steel, as Q195 steel, Q235 steel and homemade low surrender steel, this novel support is with existing buckling-restrained support difference, in steel sleeve, do not adopt packing material, stable effect of contraction is provided for the support central layer by the construction measures such as stiffening rib in the steel sleeve fully, can avoids the buckling problem of pressurized core under elasticity and plastic stage effectively.Bracing steel sleeve flection restriction support component and minor structure thereof have been carried out static(al) back and forth to be tested, test shows, the buckling-restrained support of this kind has good hysteresis feature and energy-dissipating property, it is a kind of highly effective power consumption member, can reach 1/70 deflection, satisfy the floor displacement deformation requirement of building structure 1/50 under the rarely occurred earthquake effect, can improve the shock resistance of building structure greatly; And realized the production domesticization of material and making, the cost of this support is reduced greatly, laid a good foundation for applying.

Description of drawings

Fig. 1 is the organigram of the embodiment of the invention.

Fig. 2 is the central layer schematic diagram of the embodiment of the invention.

Fig. 3 is the structure cross sectional representation of the embodiment of the invention.

Fig. 4 is the central layer end cross-sectional schematic diagram of the embodiment of the invention.

Fig. 5 is the sleeve cross sectional representation of the embodiment of the invention.

Fig. 6 is the force-displacement curve of the test gained of the embodiment of the invention.

Number in the figure: 1 is central layer, and 2 is the central layer stiffening rib, and 3 is inner sleeve, and 4 is the inner sleeve stiffening rib, and 5 is the central layer restraining plate, and 6 is outer sleeve, and 7 is the sleeve ends shrouding.

The specific embodiment

The present invention is further described below in conjunction with drawings and Examples.

See also Fig. 1-5, as seen from the figure, the present invention mainly comprises: core part, inner sleeve part, outer sleeve, wherein the core part is formed (shown in Fig. 2,4) by central layer 1 and central layer stiffening rib 2, the inner sleeve part is made up of inner sleeve wallboard 3, inner sleeve stiffening rib 4 and central layer restraining plate 5, and outermost layer is outer sleeve (as shown in Figure 5).

Structure of the present invention:

1, because sleeve must be able to have good effect of contraction to flexing outside the plane of central layer, member of the present invention adopts the inner sleeve ribbed panel, the construction measure that makes central layer restraining plate 5 and central layer 1 hold out against (that is, make between central layer restraining plate 5 and the central layer 1 and do not have the gap) reaches this purpose;

2, be easy to take place the unstability plane outside at the variable cross-section place that the nothing that supports retrains non-flexing section, the method that member employing sleeve ends shrouding of the present invention holds out against (that is, make between sleeve ends shrouding 7 and the central layer stiffening rib 2 and do not have the gap) solves this problem;

3, (promptly retraining non-flexing section edge) at stiffener edge, central layer end locates, be easy to enter plasticity, form plastic hinge, make whole support central layer end that rigidity rotation take place herein, so, will apply a very large concentrated force to inner sleeve in plastic hinge rotation place, make inner sleeve produce the part and bloat.In order to address this problem, this member adopts the method to the ribbing of inner sleeve wall plate, has strengthened rigidity outside the plane of inner sleeve wallboard on the one hand, also makes inner sleeve can be good at central layer is played effect of contraction on the other hand.Specific embodiments is: (for example 100～200mm) add an inner sleeve stiffening rib 4 every a determining deviation on inner sleeve wallboard 3.

The buckling-restrained support of TJI type of the present invention:

Its preparation method may further comprise the steps:

(1) central layer stiffening rib 2 and central layer 1 usefulness butt weld are welded together;

(2) central layer restraining plate 5 and sleeve wallboard 3 usefulness fillet welds are welded together;

(3) the inner sleeve wallboard 3 that will weld central layer restraining plate 5 carries out assembly unit, as shown in Figure 3;

(4) assembly unit is good inner sleeve wallboard 3 usefulness butt welds weld together;

(5) inner sleeve stiffening rib 4 and inner sleeve wallboard 3 usefulness fillet welds are welded together;

(6) again outer sleeve wallboard 6 is carried out assembly unit, as shown in Figure 3;

(7) assembly unit is good outer sleeve wallboard 6 usefulness butt welds weld together.

For verifying this properties of product, to have made following test specimen and studied, sample dimensions and material are as shown in table 1.

Sample dimensions and material list table 1

1, the Intensity Design of buckling-restrained support

The surrender bearing capacity F of buckling-restrained support _dFor:

F _d＝R _yf _yA ₁＝1004.64kN

2, the design of sleeve checking computations

$\frac{{\mathrm{\&pi;}}^{2}E{I}_1}{{\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="S2008100330699E00011.png"\; state="\{\{state\}\}">l</figure-callout>}}^2}/\mathrm{\&omega;}{F}_d=3.91\&GreaterEqual;1.2$

Meet the demands.

The overhanging flakiness ratio of plate of not having the non-surrender section of constraint (linkage section) is:

$\frac{b}{t}=11.2\&le;13\sqrt{\frac{235}{f_y}}=14.3$

Meet the demands.

3, design of node

By design of node requirement checking computations, when checking computations, considered to support press draw bearing capacity ratio, material is superpower and the influence of effect such as strain hardening, node meets the demands as calculated.

By test gained force-displacement curve very full (as shown in Figure 6), illustrate that this buckling-restrained support has good energy dissipation capacity and low cycle fatigue property.

For this reason, the invention provides a kind of novel buckling-restrained support, can adopt homemade mild steel, as Q195 steel, Q235 steel and homemade low surrender steel.This novel support: 1) material is homemade; 2) in steel sleeve, do not adopt packing material, stable effect of contraction is provided for the support central layer by the construction measures such as stiffening rib in the steel sleeve fully, avoid the buckling problem of pressurized core under elasticity and plastic stage.By to the steel bushing of putting more energy into buckling-restrained support carry out reciprocal load test, show that the buckling-restrained support of this kind has stable hysteresis feature and good energy-dissipating property, be a kind of highly effective power consumption member, satisfy the floor displacement deformation requirement of building structure 1/50 under the rarely occurred earthquake effect; Be used for multi-rise building, can improve the anti-seismic performance of structure greatly.

The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.

Claims (4)

1. improved buckling-restrained bracing member, it is characterized in that: comprising: core part, inner sleeve part, outer sleeve, wherein the core part is made up of central layer and central layer stiffening rib, the inner sleeve part is made up of inner sleeve wallboard, inner sleeve stiffening rib and central layer restraining plate, and outermost layer is an outer sleeve; There is not the gap between this central layer restraining plate and the central layer; There is not the gap between sleeve ends shrouding and the central layer stiffening rib.

2. improved buckling-restrained bracing member according to claim 1 is characterized in that: add an inner sleeve stiffening rib every a determining deviation on this inner sleeve wallboard.

3. improved buckling-restrained bracing member according to claim 2 is characterized in that: this determining deviation is 100～200mm.

4. the preparation method of arbitrary described improved buckling-restrained bracing member in the claim 1 to 3 is characterized in that: may further comprise the steps:

(1) central layer stiffening rib and central layer are welded together with butt weld;

(2) central layer restraining plate and inner sleeve wallboard are welded together with fillet weld;

(3) the inner sleeve wallboard that will weld the central layer restraining plate carries out assembly unit;

(4) assembly unit is good inner sleeve wallboard welds together with butt weld;

(5) inner sleeve stiffening rib and inner sleeve wallboard are welded together with fillet weld;

(6) again the outer sleeve wallboard is carried out assembly unit;

(7) assembly unit is good outer sleeve wallboard welds together with butt weld.

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