带剪切连梁的双柱式桥墩抗震性能分析方法与试验验证

在带剪切连梁的双柱式桥墩拟静力试验研究基础上,该文建立了带剪切连梁的双柱式桥墩的集中塑性铰和纤维单元分析方法并进行了抗震性能分析,比较分析了各模型的墩柱剪力-位移滞回曲线及其骨架曲线与耗能能力、剪切连梁滞回曲线及其耗能能力等性能参数。结果表明:采用集中塑性铰和纤维单元分析方法预测的抗震性能与试验结果吻合较好,且两种分析方法能合理反映桥墩最大荷载后的强度下降、刚度退化和耗能水平下降等现象,表明该方法是分析带剪切连梁的双柱式桥墩抗震性能的有效可靠方法。

ANALYTICAL METHODS AND EXPERIMENTAL VALIDATION OF SEISMIC PERFORMANCE OF A TWIN-COLUMN PIER WITH SHEAR BEAM

Based on pseudo-static tests of a twin-column pier with shear beam, the concentrated plastic hinge and fiber element methods are established to analyze the seismic performance of the twin-column pier with shear beam. The numerical seismic performance results are compared with the experimental results including hysteretic curve, skeleton curve, and dissipation energy capacity of the twin-column pier, and hysteretic curve and dissipation energy capacity of the shear beam. The comparison shows that the seismic performance of the twin-column pier with shear beam from the concentrated plastic hinge and fiber element methods are significantly consistent with the experimental results; the concentrated plastic hinge method and fiber element method can effectively predict decreases in strength and dissipation energy and the degraded unloading stiffness of the twin-column pier with shear beam when it reaches the maximum load; both numerical methods are effective and feasible on analyzing the seismic performance of the twin-column pier with shear beam.