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传统屈曲约束支撑结构在震后残余变形较大,不易修复或更换。该文提出一种新型自复位可更换软钢耗能支撑,提出了理论设计方法。制作了缩尺比例为0.6的试验构件并进行了低周往复加载试验同时对试验进行了数值模拟,与试验结果进行对比并作进一步分析。研究结果表明:新型支撑中软钢耗能件可以实现良好的高阶屈曲耗能,在加载过程中支撑主体构件无塑性发展;同时残余变形很小,结构有着良好的自复位能力和受力性能。软钢夹持间距的适当减小,软钢耗能件的多阶屈曲变形和塑性发展更为理想,提高了支撑的耗能能力,尤其改善了支撑在受压时的耗能能力。在更换了软钢耗能件后,支撑仍可以继续工作,实现了新型支撑“自复位可更换”的设计目标。
The traditional buckling restraint brace structure is larger after the earthquake and is not easy to repair or replace. This paper presents a new self-resettable soft steel energy consumption support, put forward the theoretical design method. A test piece with a scale ratio of 0.6 was fabricated and subjected to a low cycle reciprocating loading test. Simultaneously, the experiment was simulated numerically and compared with the test results for further analysis. The results show that the new type of mild steel energy-dissipating member can achieve good high-order buckling energy dissipation, and the main body member does not develop plastically during loading. At the same time, the residual deformation is small and the structure has good self-resetting capability and force-bearing performance. With the proper reduction of the spacing of mild steel, multi-stage buckling deformation and plasticity development of soft steel energy dissipation parts are more ideal, which increases the energy dissipation capacity of the support and especially improves the energy dissipation capacity of the support under compression. After the replacement of mild steel energy-consuming components, the support can still continue to work to achieve a new type of support “from the reset can be replaced ” design goals.