Y形偏心钢支撑RC框架结构滞回性能试验研究

Experimental investigation of Y-eccentrically steel braced RC frames energy-dissipation

为了研究耗能段与RC框架梁采用不同连接节点形式对Y形偏心钢支撑RC框架结构滞回性能的影响,进行了2榀1/3缩尺Y形偏心钢支撑RC框架的低周反复荷载试验。介绍了试验过程,分析了试件在循环荷载作用下的破坏机理、滞回性能、延性、刚度退化规律以及耗能能力。试验结果表明:应用Y形偏心钢支撑加固RC框架合理可行,Y形偏心钢支撑承担了结构80%以上的水平荷载;U型外包钢与框架横梁连接的试件连接节点承载能力较高,耗能段耗能充分,结构的滞回曲线饱满;钢板与框架横梁底部连接的试件滞回曲线捏缩,耗能段耗能不充分,结构整体耗能能力差;U形外包钢与框架横梁连接的试件,耗能段破坏导致结构失效;钢板与框架梁底部连接的试件,连接节点破坏导致结构失效。

In order to research the energy-dissipation of Y-eccentrically steel braced RC frames of different connected nodes between link and RC frame beam, the one-bay two-story test specimens at one-third scale were carried outunder low reversed cyclic loading. Process of test was introduced. Failure mechanism, hysteretic behavior, ductility, rigidity degeneration and energy-dissipation of specimens were analysed. Experimental studies and analysisshow that Y-eccentrically steel brace reinforced RC frame is rational and feasible, and 80% of the lateral load was carried by Link. Frame beams and link connected node have higher bearing capacity, when the U shaped steel con-nect frame beams and the specimen of the hysteresis curve are full. The specimen has poor energy consumption capacity, when the steel slab connects the bottom of frame beams and the hysteresis of specimen curve demonstratepinch phenomenon. If U shaped steel connects frame beams, the link failure would cause the structure failure. If Steel slab connects the bottom of frame beams, the failure of connection would cause the failure of the structure.