强震下钢筋混凝土柱残余位移研究

Study on residual displacement of reinforced concrete column under strong earthquake

针对钢筋混凝土柱定义了残余位移系数,然后选取了20条地震波,通过非线性时程分析,研究了强震下钢筋混凝土柱残余位移的影响因素。结果表明:随着钢筋屈服强度、配筋率或轴压比的增大,柱顶屈服位移变大;随着钢筋屈服强度或配筋率的减小、轴压比和柱顶残余位移系数增大;柱顶屈服位移和残余位移系数与混凝土强度关系不大;当轴压比变大时,配筋率对柱顶残余位移系数的影响更大;当配筋率变大时,轴压比对柱顶残余位移系数的影响变小。

Residual displacement ratio was defined for the RC （reinforced concrete） column, and the factors influencing the residual displacement of the RC column under strong earthquake are investigated by way of nonlinear time history analyses using 20 earthquake records. The results show that the yield displacement at the top of the RC column arises with the increase of steel reinforcement yield strength, reinforcement ratio or axial compression ratio, while the residual displacement ratio at the top of the RC column augments with the drop of steel yield strength or reinforcement ratio and the increase of axial compression ratio. The yield displacement and residual displacement ratio has little relation to the concrete strength. The effect of the reinforcement ratio on the residual displacement ratio at the top of the column gets more remarkable for the larger axial compression ratio, while the effect of axial compression ratio on the residual displacement ratio at the top of the column is less with the increase of the reinforcement ratio.