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防屈曲支撑的稳定及延性性能是衡量其抗震性能的重要参数,对防屈曲支撑的稳定及延性性能及进行了系统研究。分析了防屈曲支撑的整体稳定性能,并基于ANSYS研究了外包单元为钢管混凝土时约束系数对防屈曲支撑整体稳定性能和延性性能的影响;分析了内核单元高模态屈曲产生的原因及由其导致的防屈曲支撑受力过程中性能的改变,以及支撑内核单元与外包钢管混凝土之间的间隙大小对防屈曲支撑高模态稳定性能的影响。通过上述分析给出了防屈曲支撑约束系数的限值为2.5,并认为内核单元与外包单元之间间隙的大小在内核单元厚度的1/20～1/10之间较为合理。通过4个试件的试验研究验证了有限元分析的结果。
The stability and ductility of buckling brace is an important parameter to evaluate its seismic performance. The stability and ductility of buckling brace are studied systematically. The stability of anti-buckling brace is analyzed and the influence of restraint coefficient on the overall stability and ductility of buckling brace is analyzed based on ANSYS. The reason of the high-mode buckling of core element and the influence of restraint coefficient The change of the performance caused by the buckling brace and the influence of the gap between the supporting core element and the concrete filled steel tube on the high modal stability of the buckling brace. According to the above analysis, the limit value of restraining buckling restraint coefficient is 2.5, and it is reasonable to think that the size of the gap between the core unit and the outsourcing unit is between 1/20 and 1/10 of the thickness of the core unit. The experimental results of four specimens verified the results of finite element analysis.