基于位移设计的钢筋混凝土桥墩抗震性能试验研究(I):拟静力试验

Experimental evaluation of the seismic performance of reinforced concrete bridge piers designed on the basis of displacement(I): Quasi-static test

通过拟静力试验研究了基于位移设计钢筋混凝土桥墩的抗震性能。利用基于位移抗震设计方法和桥梁抗震规范方法设计了各2根和1根1:2.5比例钢筋混凝土桥墩试件,对低周反复荷载作用下试件试验破坏形态、承载力、位移延性、滞回耗能、刚度退化等方面进行了比较分析,可以认为基于位移设计的钢筋混凝土桥墩能够达到预期的延性抗震要求,并且在相对耗能能力(与理想弹塑性模型相比)、刚度退化性能方面与现行规范抗震设计方法设计的桥墩相当。试验表明建议的钢筋混凝土桥墩基于位移的抗震设计方法是实际可行的。

Seismic performance of reinforced concrete bridge piers designed by using displacement-based method is verified by the quasi-static test. Two specimens with 1：2.5scale are designed by seismic design method based on displacement, and another reference specimen with same scale is designed according to bridge seismic design code. The damage states, bearing capacities, ductility, dissipated energy and stiffness degradation of specimens are compared when the specimens are subjected to cyclic loading. It is shown that seismic ductility capacities of reinforced concrete bridge piers designed on the basis of displacement may meet the seismic demands expected, especially the capacities of relative dissipated energy （ compared with ideal elasto-plastic model） and stiffness degradation for the bridge pier almost have the same as that designed by current seismic design code. Test results suggest the proposed seismic design method based on displacement is feasible.