箱梁匝道桥运营期倾覆风险管理  

Overturning Risk Management of Box-girder Ramp Bridge in Operation Period

作　　者：李会驰[1] 刘晓娣[1] 冯苠[1] 

机构地区：[1]中交公路规划设计院有限公司,北京市100088

出　　处：《公路》2016年第7期88-93,共6页Highway

基　　金：交通运输部建设科技项目;项目编号2015318J30050

摘　　要：为避免箱梁匝道桥的倾覆破坏,采用考虑非线性影响的实体有限元模型,分析倾覆机理、影响因素,结合结构形式和加固措施的调研,构建运营期倾覆风险场景,提出风险评估方法和风险防控措施。结果表明,仅支座支承的简支梁桥和连续梁桥,由于抗扭跨径过长或双支座横向间距过小,易产生倾覆风险;设置墩梁固结、优化跨中独柱单支承体系、增大梁端双支座横向间距、设置限位构造能有效防止倾覆事故的发生。In order to avoid the overturning accidents of box-girder ramp bridge, the overturning processes and the influence factors are analyzed with finite element model considering the nonlinear characteristics. The method of risk assessment and risk control for overturning risk-scene is constructed based on the structure types and the reinforcement measures of box-girder ramp bridge. The results show that for simply girder and continuous girder bridges which are only supported by bearings are easy to overturn due to the long anti-torsion span or the little lateral spacing of double support, and setting the pier-beam consolidation, optimizing the single-bearing system of the mid-span single-column pier, increasing the lateral spacing of double support, and setting the limit-displacement structure could effectively control the occurrence of the accident.

关 键 词：箱梁桥 倾覆 风险评估 风险防控 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]