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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,结合结构型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治倾覆事故的发生。
In order to avoid the overturning failure of box girder ramp bridge, the finite element model considering the influence of non-linearity was adopted to analyze the mechanism of capsizing and influencing factors, and the investigation of structure type and reinforcement measures was taken to build the scene of capsizing risk during operation period. The risk assessment method and risk Prevention and control measures. The results show that simply supported girder bridges and continuous girders bridges are prone to overturning due to the long span of torsional span or the too small transverse distance between two girders. Single bearing system increases the lateral spacing of double supports at the beam end. Setting the limit structure can effectively prevent the occurrence of overturning accidents.