再生混凝土框架顶层角节点的抗震性能试验研究

Experimental study on seismic behavior of knee-joints in recycled concrete frame

通过对3榀再生混凝土框架顶层角节点(再生粗骨料掺量为100%)在低周反复荷载作用下的抗震性能试验,对试件的破坏形态、延性、耗能能力等进行了分析。研究表明,再生混凝土框架顶层角节点试件在低周反复荷载作用下经历初裂、通裂、极限、破坏4个阶段,最终呈节点核心区剪切破坏。位移延性系数在3.27～3.95之间,具有良好的抗震性能,可用于有抗震设防要求的框架。采用ANSYS软件建立了节点的有限元计算模型,进行了单调荷载下的有限元非线性分析,得到了骨架曲线和试件的应力分布形态,有限元计算结果与试验结果吻合较好。采用《混凝土结构设计规范》规定的公式对角节点抗剪强度进行了计算并与试验数据相比较,发现计算值偏于不安全。

A study is conducted on the seismic behavior of three recycled concrete knee-joints with 100% recycled coarse aggregate under low frequency reversed load. The seismic behavior of recycled concrete members such as failure features, ductility, stress of steels in the specimens and energy dissipation under reversed loads is investiga- ted. The test and analyses show that the recycled concrete member can be applied in structures because of its good seismic behavior. These specimens are modeled with ANSYS software. The calculated skeleton curves and the stress distribution of the specimen are corresponding well with the test results. It is found that the calculated shear capaci- ty from formula provided in the code is significantly greater than test results.