关键词: 高性能复合砂浆钢筋网, 二次受力, 抗震性能

Abstract: In order to study the influence of transverse reinforcement characteristic value,reinforcement layer thickness,longitudinal reinforcement characteristic value and axial compression ratioon seismic performance of RC square columns strengthened with HPFL under secondary load,the folloming experiments and analysis are made.Firstly,the finite element model of RC columns strengthened with HPFL under secondary load is established by using the“model change”setting in ABAQUS based on the low-cycle load experiment of RC columns strengthened with HPFL,and the validity of the model is verified by comparing the simulation results with the experiment results.Then,the hysteretic curve,skeleton curve,energy dissipation capacity curve,carrying capacity and ductility coefficient of the finite element model of RC square columns strengthened with HPFL under secondary load with different parameters are analyzed.The results show that:when the transverse reinforcement characteristic value is 0.082,0.164and 0.328,the increasing range of carrying capacity is 3%,8%and 14%,and the increasing range of ductility coefficient is 89%,109%and 118%;when the reinforcement layer thickness is 20mm,30mm and 40mm,the increasing range of carrying capacity is 3%,11%and 14%,and the increasing range of ductility coefficient is 89%,90%and 118%;when the longitudinal reinforcement characteristic value is 0.082,0.191and 0.3,the increasing range of carrying capacity is 2%,3%and 4%,and the increasing range of ductility coefficient is 57%,89%and 79%;when the axial compression ratio is 0.8,the ductility coefficient of RC square columns strengthened with HPFL under secondary load still reaches 5.2,and the member has good ductility.

Key words: high-performance ferrocement laminate, secondary load, seismic performance