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结合某半漂浮体系独塔斜拉桥工程实例,采用有限元分析方法建立动力计算模型,计算了各阶模态对应的累计有效参与质量百分比,在此基础上,分别进行了纵、横、竖3个正交方向的独立作用及考虑水平方向与竖向组合作用的反应谱分析,得出主梁和主塔、边墩在地震作用下的内力、应力、位移响应。结果表明:竖向输入除了引起主梁竖向振动外,也使主塔产生了横向振动,且竖向输入产生的轴力、剪力、弯矩均较大,在半漂浮体系独塔斜拉桥抗震设计时应引起足够的重视。
Combined with a half-floating cable-stayed bridge engineering example, the finite element analysis method is used to establish the dynamic calculation model, and the cumulative effective participation mass percent corresponding to each mode is calculated. On this basis, the vertical, horizontal and vertical 3 orthogonal directions and the response spectrum analysis considering the combination of horizontal direction and vertical direction, the internal force, stress and displacement response of main girder, main tower and side pier under earthquake action are obtained. The results show that in addition to the vertical vibration of the main girder, the vertical vibration also causes lateral vibration of the main tower, and the axial forces, shear forces and bending moments generated by the vertical input are larger. In the semi-floating system, Bridge seismic design should cause enough attention.