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Buckling Restrained Brace |
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Buckling Restrained Brace Introduction
Buckling restrained brace can be called no bond brace which belongs to a new steel structure brace and energy dissipative brace. The middle of the buckling restrained brace is filled with core material made of low yield point steel. A bigger elastic deformation is allowed under axial force to realize the purpose of dissipation. To avoid the core material's overall buckling by press force, in other words, yield deformation can be realized under both tension and press, core material is placed into a steel sleeve which will be poured with concrete or mortar later. Refer image 1 for member compound indication. To lower or eliminate the force against mortar or concrete when core material is applied with axial force and for the reason of core material's expansion by press due to Poisson's effect, a layer of no bond material or very narrow gap will be set between core material and mortar. Thus, the brace can also yield thoroughly when pressed in result of equaling the brace's tension and press, overcoming the shortcoming of traditional brace's buckling by press, improving the brace's bearing ability with a plump hysteretic curve(showed as image 2) and enhancing the structure's earthquake resistance ability. When designing the brace, destabilization can be ignored and only strength is calculated with the consideration of same brace capacity on tension and press and no buckling when pressing.?
1.compound chart of buckling
restrained brace |
2.data of Chen Zhengcheng pure steel
buckling restrained brace test |
Features and Advantages of Buckling Restrained Bracing
Advantages as following comparing with normal brace:
better hysteretic dissipative capability
working as normal brace under small quake, working as dissipative member under big quake
hysteretic curve comparison between buckling
restrained brace and normal brace |
hysteretic curve of normal brace |
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