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含有屈曲约束支撑框架的振动台试验研究
程绍革,罗开海,孔祥雄
摘 要
 
(中国建筑科学研究院工程抗震研究所,北京 100013)
[摘要]通过对含有屈曲约束支撑的框架进行振动台试验,研究了屈曲约束支撑对结构地震反应的减震效果。选用3条天然波和1条人工波进行加载,记录了模型的加速度反应,分析了BRB在试验中的力学性能,并与理论计算值进行了对比,研究了台面输入加速度为0.6g和1.0g时框架底层BRB的滞回曲线。探讨了不同台面输入下输入能量在模型中的分布情况。试验及研究结果表明,当台面输入加速度小于0.6g时,屈曲约束支撑可以为结构提供稳定的侧向刚度;当台面输入加速度大于0.6g时,屈曲约束支撑通过自身塑性变形来吸收能量;当台面输入加速度为1.0g时,屈曲约束支撑可以吸收台面输入的20%~40%的能量。
[关键词]屈曲约束支撑; 含有屈曲约束支撑的框架; 振动台试验; 耗能性能
Experiment study on shaking table test of steel frame with buckling-restrained braces
Cheng Shaoge,Luo Kaihai,Kong Xiangxiong(Institute of Earthquake Engineering, China Academy of Building Research, Beijing 100013, China)
Abstract:A buckling-restrained braced frame (BRBF) was tested by shaking table to study the mechanism and efficiency of buckling-restrained brace (BRB) for reducing the seismic responses of the structure. Three natural earthquake waves and one test wave were selected. The accelerations of the model were recorded and the mechanical properties of BRB were analyzed. The hysteresis loops of BRB were studied when the PGA equal to 0.6g and 1.0g, and the energy distribution of the model was discussed. The test results indicate that BRB can provide stable stiffness to the structure when PGA is less than 0.6g and can get into elasto-plastic stage to dissipate the energy when PGA is more than 0.6g. The results also indicate that BRB can absorb 20%~40% of the whole input energy when PGA reaches 1.0g.
Keywords:buckling-restrained brace; buckling-restrained braced frame; shaking table test; energy dissipation characteristics
“十一五”国家科技支撑计划的重点项目(2006BAJ13B01)。
作者简介:程绍革,研究员,Email:chengshaoge@163.com。
参考文献
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[3] 汪家铭, 中岛正爱. 屈曲约束支撑体系的应用与研究进展(Ⅱ)[J]. 建筑钢结构进展, 2005 ,7 (2) :1-11.
[4] 罗开海,程绍革, 白雪霜, 等. 屈曲约束耗能支撑力学性能分析[J].工程抗震与加固改造,2007, 29(2):23-27.
[5] 罗开海,孔祥雄,程绍革. 一种新型屈曲约束支撑的研制与试验研究[J]. 建筑结构,2010,40(10):1-6.
[6] 孔祥雄,罗开海,程绍革. 含有屈曲约束支撑平面框架的抗震性能试验研究[J]. 建筑结构,2010,40(10):7-10.
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