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结合跨径200m的超大跨径变截面拱式渡槽的结构设计方案,通过建立有限元模型,对渡槽进行了动力特性和地震响应分析。结果表明,设计方案拱轴系数的取值合理,拱脚偏心弯矩引起的拉应力在允许范围内;变截面的做法增大了拱脚截面刚度,增强了拱圈的稳定性,有效地减小了起控制作用的拱脚处的轴向拉应力,可满足渡槽抗震要求。
Combined with the structural design of the super-large-span cross-section arched aqueduct with a span of 200m, the dynamic characteristics and seismic response of the aqueduct were analyzed by establishing the finite element model. The results show that the reasonable value of the arch axis coefficient of the design scheme and the tensile stress caused by the eccentric bending moment of the arch foot are within the allowable range. The variable cross section method increases the section rigidity of the arch foot and enhances the stability of the arch ring, A small axial tensile stress at the control arch feet to meet the aqueduct seismic requirements.