基于损伤和能量耗散的钢筋混凝土柱抗震性能研究

摘要

The static cyclic testing data of 7 reinforced concrete columns with different axial load or dif-ferent stirrup ratio were chosen from the PEER database .The effects on hysteretic behavior ,ductility index and secant stiffness of reinforced concrete columns due to axial forces and stirrup ratio were in-vestigated .The relationship between damage index and energy dissipation was analyzed based on Park-Ang damage model in order to study damage developing procedure of RC columns with different axial load or stirrup ratio .It was concluded that somewhat fat hysteretic loop and increased displace-ment ductility to the RC column with low axial force or high stirrup ratio was observed ,larger yield deformation ,higher yield load and peak capacity happened on the specimens with higher axial load or higher stirrup ratio ,the contribution to damage index due to maximum response deformation was lar-ger than that due to accumulative hysteretic energy at the first several cycles ,the contribution to dam-age index due to accumulative hysteretic energy increased with the number of cycles ,and the space of stirrup was one of the crucial factor to seismic behavior of RC column .%从PEER数据库中选取7根钢筋混凝土柱在低周反复荷载作用下的试验数据，在分析了不同轴压比和配箍率下各试件的滞回特性、延性指标和割线刚度退化等的基础上，基于钢筋混凝土构件的Park-Ang双参数破坏准则，研究了构件损伤与耗能的关系、轴压比和配箍率对滞回耗能和损伤演化的影响。结果表明，轴压比较小和配箍率较高的试件，滞回曲线较为饱满，具有较好的延性性能；在一定范围内，增大轴压比或配箍率可以提高试件的屈服位移、屈服荷载和峰值荷载；加载前期，试件的损伤主要由位移首次超越引起，累积耗能对试件损伤影响相对较小，随着位移幅值的增大，累积耗能对试件损伤的贡献逐渐加大；配箍率相同的情况下，减小箍筋的间距对改善钢筋混凝土抗震性能有显著作用。