新型格构式高墩连续弯梁桥抗震性能分析

以四川雅泸高速公路干海子特大桥为工程背景，采用Midas Civil有限元软件建立三跨一联钢管混凝土格构式高墩连续弯梁桥结构。进行E1弹性地震响应分析，探讨了该类新型梁桥结构的动力特性、内力分布规律，以及地震波激励角度参数对全桥各个指标的影响规律，研究结果表明:钢管混凝土格构式高墩连续弯梁桥结构刚度较柔、周期长，不可忽视弯扭耦合效应。上部主梁弯矩值控制截面位于固定支座位置处，扭矩峰值出现在梁端位置处；下部格构墩弯矩和轴力控制截面均出现在固底墩墩底，墩顶为桥墩位移控制截面。支座中心连线和与之垂直的方向均为最不利激励角度。

Research on seismic performance analysis of a new type of continuous curved-beam bridges with latticed high-rise piers

Based on the engineering background of Ganhaizi Super-large Bridge in Yalu Expressway in Sichuan Province, the finite element software Midas Civil was adopted to build the structure of three -span continuous curved-beam bridges with latticed high-rise piers of concrete-filled steel tubes (CFST) . Based on the analysis of E1 elastic seismic response, discussions were made about such a new type bridge structure, to be specific, on the effects of its dynamic characteristics, its distribution law of internal forces and the effects of the parameters of its seismic wave’s incentive angle on the various indexes of the whole bridge. Research results show that the curved continuous beam bridge with CFST latticed high-rise piers has a relatively flexible structure and a long period, and the coupling effects of the bending and torsion cannot be ignored. The control section of the upper main beam’s bending moment is located at the position of the fixed bearing, and the maximum torque value is at the end of the beam; the bending moment and the axial force control section of the lower latticed pier are both at the bottom of the fixed bottom pier and the pier’s top is its displacement control section. The centerline of the bearing and the direction perpendicular thereto are the most unfavorable incentive angles.