轴压荷载下带延性铸造连接件的防屈曲支撑的力学性能

Study on mechanical properties of buckling-restrained braces with ductile cast connections under uniaxial loading

为了改善传统梁柱节点焊接残余应力较高的状况,对5个不同参数的带延性铸造连接件的防屈曲支撑进行轴压加载试验研究,分析铸造连接件耗能段长度、耗能板宽厚比、加劲肋宽厚比等参数对试件承载力、延性、刚度等力学性能的影响.结果表明:带延性铸造连接件的防屈曲支撑具有良好的承载力、延性及刚度,其承载力与连接件的耗能段长度、耗能板宽厚比成正比.这种新型支撑将结构的非弹性变形集中在延性铸造连接件上,保护了结构其余构件的安全,提高了结构的塑性变形能力.

In order to improve the high residual stress of traditional beam-column joints,5 buckling-restrained braces of ductile casting connectors with different parameters was tested subjected to axial compression loading,and the length of the energy dissipating section of the casting connectors and the width-to-thickness ratio of the energy dissipating plate were analyzed.The effect of the stiffener width-thickness ratio and other parameters on the mechanical properties such as the bearing capacity,ductility and stiffness of the specimen is analyzed.The results show that the buckling-restrained braces with ductile casting connector has good bearing capacity,ductility and rigidity,and its bearing capacity is proportional to the length of the energy dissipating section of the connector and the width to thickness ratio of the energy dissipating plate.This new type of support concentrates the inelastic deformation of the structure on the ductile casting connector,protects the safety of the rest of the structure,and improves the plastic deformation ability of the structure.