【摘要】 为确定某一独塔双索面斜拉桥合理的抗震约束体系,运用有限元软件Sap,结合该桥的特点,建立了索塔纵向、过渡墩纵横向均自由和索塔纵横向、过渡墩横向均约束两种不同约束的体系下桥梁的有限元模型,这两种约束体系分别视为方案1和方案2,并对其分别进行自振特性以及的地震响应分析。结果表明,方案2和方案1相比,主塔支座处的剪力、塔柱的内力以及过渡墩和主塔支座处的位移都降低了很多,索塔约束可降低主塔的内力,从而提高主塔的安全度,因此推荐采用索塔纵横向、过渡墩横向均约束的方案。更多还原

【Abstract】 In order to find out the appropriate seismic constraint system for single pylons and double cable planes cable-stayed bridge,the space finite element model of the bridge with different constraint system was established by using the software Sap program:tower is free in longitudinal direction and transition piers is free in longitudinal and lateral directions;tower is constrained in longitudinal and lateral directions and transition piers is constrained in lateral direction.The two kinds of constraint system are regarded as Scheme 1 and Scheme 2.The analysis of the structural natural vibration characteristic and response under earthquake wave were carried out.The results of calculation indicate that,comparing with Scheme 1,the shear at the tower bearing,the force of tower,the displacement at transition piers and tower bearing of scheme 2 are all reduced,and the safety of tower of scheme 2 is enhanced.So Scheme 2 is adopted in the paper.更多还原