单塔斜拉桥抗震约束体系分析

Jiang-Chonghu, Li-Dejian
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引用次数: 0

摘要

以石河子单塔斜拉桥为工程背景,建立有限元地震模型,利用非线性动力时程对该桥进行强震作用下的地震分析。为了研究阻尼约束体系对单塔斜拉桥抗震性能的影响,本文对纵向、横向不同约束体系进行了对比分析。在纵向上,我们对单塔斜拉桥分别采用刚性体系、浮动体系、竖向支撑体系、竖向支撑与弹性索体系、竖向支撑与粘性阻尼器(FVD)等不同约束体系进行了罕见地震作用下的地震计算,得出如下结论:当采用活动支座作为竖向支座时,支座的摩擦阻力可以大大提高结构的抗震性能,因此在计算时应考虑其影响,相应的,包含竖向支座和FVD的体系是最优的纵向地震约束体系。在横向上,分别对塔架分别采用刚性体系、浮动体系、横向铰接、横向自由、竖向支撑和弹性索、竖向支撑和粘性阻尼器(FVD)等不同约束形式进行了地震计算,过渡墩分别采用横向铰接、横向自由、铅橡胶支座、竖向支撑和粘性阻尼器(FVD)等不同约束形式;得出如下结论:在过渡墩应力力对设计无决定性影响的情况下,主塔竖向支承加粘性阻尼器,过渡墩横向铰接为相对最优约束体系;在过渡墩应力力对设计有决定性影响的情况下,主塔竖向支承加弹性索,过渡墩加铅橡胶支座为相对最优约束体系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis about Seismic Constrained System of Single Tower Cable-Stayed Bridge
Taking Shihezi single tower cable-stayed bridge as the engineering background to establish finite element seismic model, using the nonlinear dynamic time history to get seismic analysis of the bridge under strong earthquake. In order to study the effect of damping constrained system on single tower cable-stayed bridge's seismic performance, this paper makes a contrastive analysis about the longitudinal, lateral different constrained system. In the longitudinal direction, we make a seismic calculation under the rare earthquake action while the single tower cable-stayed bridge respectively use different constrained system, such as rigid system, floating system, vertical supporting system, vertical support and elastic cable system, vertical support and viscous damper (FVD), etc, drawing the following conclusion: When using the movable support as the vertical bearing, friction resistance of the bearing can greatly improved the seismic performance of the structure, so its influence should be considered while calculating, the system that includes vertical support and the FVD is the optimal longitudinal seismic constrained system correspondingly. In the lateral direction, we respectively make a seismic calculation under the rare earthquake action while the pylons respectively use rigid system, floating system, transverse hinged, transverse free, vertical support and elastic cable, vertical support and viscous dampers (FVD) etc different constrained forms, transition pier respectively use transverse hinged, transverse free, lead rubber bearing, vertical support and viscous dampers (FVD) etc different constrained forms, drawing the following conclusions: If the force of transition pier stress has no conclusive effect on the design, the main tower with vertical support and viscous dampers while the transition pier with transverse hinged is the relatively optimal constrained system, If the force of transition pier stress has conclusive effect on the design, the main tower with vertical support and elastic cable while the transition pier with lead rubber bearings is the relatively optimal constrained system.
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