内蒙古包树黄河特大桥工程在黄河凌汛期恰好处于最大悬臂施工阶段,为保证其安全度汛,对此种不利工况进行作用响应分析及安全性验算.采用计算土弹簧刚度来模拟桩-土摩阻效应,并采用Maxwell模型以模拟墩顶新型粘滞阻尼器的墩梁位移效应,建立了该桥最大悬臂施工阶段数值仿真模型.在流凌期间实测流冰荷载、洪水荷载及风载等作用组合下,计算分析了该桥最大悬臂阶段桥墩和主梁的线形变化和受力特性.结果表明,流冰荷载单独作用对该桥最大悬臂阶段桥墩和主梁线形和内力影响有限,同时在各荷载工况下桥墩及主梁线形和内力均满足桥梁监控要求.%In order to evaluation the bridge whether safe or not through the spring melting ice and flood season, the action response analysis and safety check are analyzed based on the yellow river bridge(85 +6 × 150+85)engineering in Inner Mongolia at the moment of at the Longest Cantilever Construction Stage. Soil spring stiffn ess. and Maxwell Model are chosen to respectively simulate the pile-soil and pier-girder deformation effect in the numerical simulation model. The alignment transformation and internal force characteristies are calculated by the action of floating ice and flood and wind lading combinations. The results revealed that the action response of the bridge subjected the floating ice separately is limited. And through the loading cases the deformation and internal forces are satisfied with the precision of bridge monitor.
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