嘉绍大桥钢箱梁施工过程中局部稳定及强度分析

发布时间：2018-06-20 11:53

本文选题：桥梁工程 + 斜拉桥　；参考：《公路交通科技》2014年02期

【摘要】：为确保嘉绍大桥主航道斜拉桥在钢箱梁施工过程中的结构安全,运用有限元软件ANSYS,根据施工方案对嘉绍大桥钢箱梁施工过程中的2个最不利工况进行了稳定性和强度验算分析,并对桥面吊机前支点接触面积、起吊荷载重量等参数进行了计算分析。计算结果表明:钢箱梁施工过程中由施工临时荷载产生的结构局部稳定满足规范要求;局部应力值虽然较大,但能保证施工安全;若桥面吊机前支点接触面积减少50%则局部稳定达临界失稳状态;起吊重量增加20%则局部稳定性已不满足要求;通过控制桥面吊机的悬臂角度、起吊荷载重量、增大前支点接触面积等措施能减小施工临时荷载不利效应的产生,提高钢箱梁施工过程中的安全储备;在嘉绍大桥施工过程中钢箱梁横隔板平面内的稳定性大于平面外的稳定性。
[Abstract]:In order to ensure the structural safety of the cable-stayed bridge in the main waterway of Jia-Shao Bridge during the construction of the steel box girder, the stability and strength of the steel box girder in the construction process of the Jia-Shao Bridge are calculated and analyzed by the finite element software ANSYSaccording to the construction scheme. The contact area of the front fulcrum and the load weight of the bridge deck crane are calculated and analyzed. The results show that the local stability of the steel box girder caused by the temporary load meets the requirements of the code, the local stress value is large, but it can ensure the construction safety. If the front fulcrum contact area of the bridge deck crane is reduced by 50%, the local stability will reach the critical unstable state, and the local stability will not meet the requirements if the lifting weight is increased by 20%. By controlling the cantilever angle of the bridge deck crane, the lifting load weight can be obtained. Increasing the front fulcrum contact area and other measures can reduce the adverse effect of temporary load and increase the safety reserve during the construction of steel box girder. In the construction process of Jia-Shao Bridge, the stability in the plane of the steel box girder is greater than that outside the plane.
【作者单位】：长沙理工大学土木与建筑学院;广东省长大公路工程有限公司;
【基金】：国家自然科学基金项目(51078041) 交通运输部科技计划项目(2010353555130) 广东省交通科技项目(201102048) 桥梁工程湖南省普通高校重点实验室基金项目(09KA03)
【分类号】：U445.4

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