摘要
为了研究钢管混凝土(CFST)组合桥墩的抗震性能,对5个桥墩试件进行低周反复加载试验,研究轴压比、配箍率、纵筋率和剪跨比对试件骨架曲线、承载能力、位移延性、刚度退化和耗能能力的影响.建立有限元模型模拟钢管混凝土组合桥墩在水平反复荷载作用下的滞回性能,数值计算结果与试验实测值吻合较好.采用该有限元模型扩充结构参数范围,进一步分析各参数对组合桥墩抗震性能的影响.试验及数值模拟结果表明:组合桥墩试件的水平侧移刚度和承载力随轴压比的增加而提高,但位移延性和耗能能力变差;提高配箍率或纵筋率均可改善组合桥墩的抗震性能;剪跨比是影响试件破坏模式的重要因素,随着剪跨比的增加,试件的水平承载力和侧移刚度降低,但变形和耗能能力明显提高.
Five pier specimens were tested under low-cyclic reversed loading conditions to study the seismic behavior of concrete-filled steel tube(CFST) composite piers. The effects of axial compression ratio, stirrup ratio,longitudinal reinforcement ratio and shear span ratio on skeleton curve, load capacity, displacement ductility,stiffness degradation and energy dissipation capacity of the specimens were discussed. A finite element model was established to simulate the hysteretic behaviors of CFST composite piers under lateral repeated loads. The numerical results agreed well with the measured values. The finite element model was used to expand the range of structural parameters, and the influence of various structural parameters on the seismic behavior of composite piers was further analyzed. The test and numerical simulation results show that the lateral displacement stiffness and the bearing capacity of the composite pier increase with the increase of axial compression ratio, whereas the displacement ductility and the energy dissipation capacity deteriorate. Increasing the stirrup ratio or the longitudinal reinforcement ratio will improve the seismic performance of the composite pier. Shear span ratio is an important factor influencing the specimen failure mode. As the shear span ratio increases, the lateral bearing capacity and the lateral displacement stiffness of the specimen decrease, but the deformation and the energy dissipation capacity increase obviously.
引文
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