RC框架节点核芯区剪切破坏——抗震性能试验

The seismic behavior of interior beam-column joints of RC frames

通过2个梁端屈服后节点核芯区剪切破坏框架节点在低周反复荷载下的加载试验,研究了节点的破坏形态、承载能力、滞回特性和耗能能力。结果表明:节点经历了核芯区开裂、梁端屈服、核芯区通裂、剪切极限直至破坏的过程;在极限荷载时,节点核芯区剪切变形引起的梁端位移占梁端总位移的比例约30%;构件具有较强的耗能能力和变形能力,具有良好的抗震性能。

This test researches 2 specimens under reversed cyclic loading, in which yielding firsdy occurs at beam ends and shearing failure secondly occurs at joints . The experimental results of seismic performance , including the load- carrying capacity, failure behavior, hysteretic behavior, energy dissipation and ductility of the specimens, was achieved. Experiment shows that the process of the joints＇ failure is that the joint first is cracked, then yielding is generated at beam end, the joint produces fully cracking and reaches ultimate state and finally ends in failure. At ultimate load the displacement of the beam end due to the shear deformation in the joint core is about the 30 percent of its global deformation, the energy dissipation and ductility of the specimens are superior.