【摘要】 进行3榀采用摩擦耗能支撑修复震损框架试件和2榀对比框架试件在水平往复荷载作用下的抗震性能试验,重点研究采用一种新型摩擦耗能支撑修复震损框架的效果和摩擦耗能器预紧力对加固试件抗震性能的影响。根据试验结果对试件的破坏特征、强度、刚度和耗能性能等抗震性能指标进行分析。试验结果表明,新型摩擦耗能器在往复荷载作用下滞回曲线接近理想矩形,摩擦耗能支撑工作性能稳定;耗能支撑加固后的震损框架水平承载力和抗侧刚度显著提高;随着摩擦耗能器预紧力增大,加固效果明显提升;耗能支撑加固震损框架的耗能能力可以恢复甚至大幅度提高,且耗能支撑是加固框架的主体耗能部位。研究成果可为震损框架的加固改造提供参考。更多还原

【Abstract】 Experiments were conducted to study the seismic behavior of damaged RC frames retrofitted with friction energy dissipation braces( FEDB) under cyclic loading. The performance of this innovative FEDB and the effect of pretightening force of the friction damper on seismic performance of retrofitted frames were studied. Based on the test results,the damage characteristic,strength,stiffness and energy dissipation capacity of all specimens were analyzed.The test results indicate that the innovative friction damper has a desirable hysteretic curve with rectangular shape and the performance of the FEDB is stable under cyclic loading. The seismic performance was greatly improved when the damaged RC frames were retrofitted with the FEDB,and the improvement effect increases with the pre-tightening force of friction dampers. The FEDB is the main energy dissipation component in the retrofitted damaged RC frames under seismic loading. This research results can provide reference for retrofitting of damaged RC frames.更多还原