暗柱截面形状对预制复合剪力墙节点抗震性能影响

The shape of the dark column section effect on prefabricated composite shear tip

为了研究不同截面形状暗柱对预制复合剪力墙节点抗震性能的影响规律,设计了1个L形和3个矩形截面暗柱节点构件分别进行了低周反复试验,研究了各试件的破坏现象、滞回曲线、骨架曲线、刚度退化、延性、耗能、强度衰减、累积损伤等抗震指标。结果表明:两类构件破坏模式均为弯剪破坏;L形截面暗柱试件滞回曲线包围的面积相对比较饱满,耗能能力较强。L形截面暗柱构件的正负向峰值荷载与矩形截面暗柱试件相比分别提高了16.90%和14.65%,刚度退化曲线较缓慢,整体承载力和抗侧刚度性能也较优越;通过对比两类构件的累计损伤指标发现,L形截面暗柱试件的损伤程度较低。L形截面暗柱试件的延性系数大于3,满足混凝土结构的抗震设计要求。总之,L形截面暗柱试件的整体抗震性能相对较好,建议可以在实际工程中进行应用和推广。

In order to study the impact of dark columns in different section shapes on prefabricated composite shear,the impact of the seismic performance of the prefabricated composite shear tip,the L-shaped and 3 rectangular cross-section dark column node components are designed to conduct low weekly repeated tests.The seismic indicators such as failure phenomenon,hysteresis curve,skeleton curve,stiffness degradation,ductility,energy dissipation,strength attenuation and cumulative damage of each specimen are studied.The results show that the destruction mode of the two types of components is bending and destruction.The area surrounded by the hysteresis curve of the L-section dark column specimen is relatively full,and the energy consumption capacity is strong.Compared with the rectangular section dark column specimens,the positive and negative peak loads of the L-section dark column members are increased by 16.90%and 14.65%respectively.The stiffness degradation cruve is slow,and the overall bearing capacity and lateral stiffness performance are also superior.By comparing the cumulative injury indicators of the two types of components,it is found that the degree of damage of the L-shaped cross-section dark column test parts is low.The ductility coefficient of the L-section dark column specimen is larger than 3,which meets the seismic design requirements of the concrete structure.In short,the overall seismic resistance of the L-shaped cross-section dark column test parts is relatively good.It is suggested that it can be applied and promoted in actual engineering.