【摘要】 以某下承式钢管混凝土系杆拱桥为背景,利用有限元程序Midas,计算出了该桥在不同吊杆初始张拉力的情况下的动力特性和地震响应,计算结果表明:该桥的面外刚度相对较小,不同的吊杆初始张拉力对该桥的动力特性和地震响应影响不大,此外竖向地震对该桥的内力影响很明显,抗震设计中应该予以重视.更多还原

【Abstract】 According to the structural characteristics of the long-span through CFST(concrete filled steel tube) arch bridge,the finity element software Midas is used to calculate dynamic characteristics and seismic responses with the different stress of the suspend.The results indicate that the arch ribs’stiffness out of plane is poor,the different stress affects the natural frequency to some extent,also the vertical seismic responses affect the internal force very obviously,which should be paid more attention.更多还原