摘要
隔震连续梁桥与邻梁较易发生碰撞并造成损伤,完善的减隔震设计应将碰撞效应考虑在内,以更好地保护梁体。以某城市轨道交通系统三跨连续梁桥为例,建立了该桥及相邻简支梁桥的空间有限元分析模型,采用非线性时程分析方法计算了不同工况中应用摩擦摆支座(FPS)进行减隔震设计后,隔震连续梁桥与相邻简支梁桥梁体的碰撞响应,探讨了梁端间隙、FPS主要设计参数对梁间碰撞响应的影响以及碰撞对隔震连续梁桥地震响应的影响。研究结果表明,同时考虑两端碰撞时,通过增大梁端间隙、减小支座等效滑动半径或增大支座摩擦系数的方式均可有效减少梁端碰撞发生的次数,虽无法保证梁间碰撞力同时减小,但是从效应累积角度考虑,仍然认为是有利于减弱梁间碰撞效应的。其中,增大梁端间隙或支座摩擦系数对碰撞效应的影响规律相似且减弱效果较为明显,减小支座等效滑动半径的效果次之。在设计中可主要通过适当增大摩擦摆支座摩擦系数和梁间间隙的手段来减小梁间碰撞效应。
Impacts happen easily between isolated continuous bridge and adjacent decks,so in a good isolation design,impact effects should be taken into account to protect the decks.The three span continuous girder bridge for a rail transport system in a city is taken as example to establish 3 Dfiniteelement analysis model,and the impact responses between the continuous beam bridge isolated by friction pendulum system and the simply supported beam bridges are calculated by nonlinear time history analysis method.The effects of gap between decks and design parameters of FPS on impacts as well as the effects of impacts on seismic responses of isolated continuous bridge are investigated and discussed.The research results indicate that,impact amounts are able to be decreased through increasing the gap between decks,decreasing effective sliding radius or increasing friction coefficient of FPS with the maximum impact force increased in some cases,which are still considered to be good for reducing the impact effect in the view of accumulation effects.And the influence rules of increasing gap and friction coefficient are similar and the effects are better than those of decreasing effective sliding radius.
出处
《公路》
北大核心
2017年第10期101-107,共7页
Highway
关键词
桥梁工程
连续梁
城市轨道交通
摩擦摆
碰撞
研究
bridge engineering
continuous beam
urban railway transit
friction pendulum system
impact
study
