Anti-buckling low yield point steel-composite energy dissipation brace

A low-yield point steel and composite material technology, applied in the field of energy-consuming supports, can solve the problems of buckling under compression and poor hysteretic performance of ordinary supports, and achieve the effects of strong designability, improved bearing capacity, and convenient forming.

Active Publication Date: 2013-12-11
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned deficiencies in the prior art, and make full use of GFRP's light weight, high strength, lower elastic modulus than steel, and corrosion resistance, the present invention proposes a buckling-free low yiel...

Method used

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  • Anti-buckling low yield point steel-composite energy dissipation brace
  • Anti-buckling low yield point steel-composite energy dissipation brace
  • Anti-buckling low yield point steel-composite energy dissipation brace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1, as figure 1 , 2As shown, the present invention is a buckling-free low-yield point steel-composite material energy-dissipating support, which is composed of peripheral composite material constraining units that are integrally sealed and wrapped around an inner core force-bearing unit, and the inner core force-bearing unit is a low-yield point steel core The steel core 1 and the outer composite material constraining unit are composed of ribbed GFRP tube 2 and polyurethane foam 3 inside the tube, and the GFRP ribs in the tube are evenly distributed, and the core steel core 1 is a straight 08F steel core steel core. The ribbed GFRP pipe 2 is a square pipe. The inner core steel core 1 and the peripheral composite material constraining unit are integrally formed by vacuum introduction at one time, and the connection parts at both ends of the inner core steel core 1 are provided with a plurality of screw holes 4, such as image 3 As shown, GFRP stiffeners 5 pe...

Embodiment 2

[0045] Embodiment 2, a buckling-free low yield point steel-composite material energy-dissipating support, same as Embodiment 1, the GFRP pipe 2 is set in a circle, and the 08F steel inner core steel core is in the shape of a cross.

[0046] The present invention is a buckling-free low-yield point steel-composite material energy-dissipating support. When working, the inner core stress unit and the peripheral restraint unit are stressed as a whole, that is, the axial tensile pressure borne by the support is determined by the inner core stress unit Shared with the surrounding constrained elements. The inner core force unit can reach yield when it is under tension. Because the elastic modulus E of GFRP c Less than the elastic modulus E of steel s Therefore, under the condition of consistent deformation, composite materials can consume more energy. When the support is under compression, the steel stress first reaches the yield strength f ys , resulting in a yield strain ε ys...

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Abstract

The invention discloses an anti-buckling low yield point steel-composite energy dissipation brace, comprising an inner core stress unit which is integrally sealed and coated by a peripheral composite constraint unit, wherein the inner core stress unit is a low yield point steel kernel steel core; the peripheral composite constraint unit is formed by a ribbed glass fiber reinforced polymer (GFRP) pipe, and contoured foams in the pipe; GFRP rib plates inside the pipe are evenly distributed; the kernel steel core and the peripheral composite constraint unit are integrally molded at one time in a vacuum importing manner; screw holes are formed in connecting parts at two ends of the kernel steel core; GFRP stiffening ribs vertical to the kernel steel core are respectively arranged at two ends of the kernel steel core. According to the anti-buckling low yield point steel-composite energy dissipation brace, the GFRP rib plates directly contact the inner core stress unit of the brace; external energy dissipated by the inner core stress unit is constrained by a composite, so that the brace is free of buckling; the carrying capacity of the brace is improved. The brace is integrally molded once in the vacuum importing manner, is corrosion-resistant, low in full-life maintenance cost, light in weight, high in strength, convenient to transport, install and construct, strong in designability, convenient to mold, and quick to produce in batch, and can be flexibly designed according to the requirements.

Description

technical field [0001] The invention relates to an energy dissipation support of a building structure, in particular to a buckling-free low yield point steel-composite material energy dissipation support. Background technique [0002] Ordinary supports will buckle under compression. When the supports buckle under compression, the stiffness and bearing capacity will decrease sharply. Under the action of earthquake or wind, the internal force of the support changes back and forth under the two states of compression and tension, so the hysteretic performance of ordinary supports is poor under repeated loads. [0003] The existing buckling-constrained brace mainly consists of three parts: inner core stress unit (core material), unbonded expandable material, and buckling-constrained unit. It can be mainly divided into two types: one is a hybrid buckling-restrained brace with reinforced concrete or steel tube concrete as the restraining member and steel as the inner core member; ...

Claims

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Application Information

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IPC IPC(8): E04B1/98B29C70/34B29C70/54B29C33/38
Inventor 董军王慧萍王玉华
Owner NANJING UNIV OF TECH
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