钢桁梁桥顶推施工的受力分析与优化设计

Stress Analysis and Optimal Design of Steel Truss Bridge Jacking Under Construction

为分析钢桁梁桥在顶推施工过程中的受力和变形,利用桥梁专用有限元分析软件,以葫芦岛站扩能改造工程新建站台天桥为原型,分别建立无导梁和无导梁钢桁梁顶推施工的有限元分析模型。结果表明,有导梁顶推施工过程的最大应力为无导梁顶推施工过程最大应力的0.42,最大挠度为无导梁顶推施工过程最大挠度的0.41。结论:对于大跨径桥梁,前导梁的设置更有利于控制顶推施工过程的应力和挠度指标,使其满足规范要求;对于小跨径,无导梁施工过程的应力和挠度能满足规范要求,但数值仍较大,若设置前导梁,则可以大大减小施工过程中的应力和挠度,从而减小成桥挠度,更有利于桥梁的使用。

In order to analyze the stress and deformation of steel truss bridge during jacking construction,used bridge-specific finite element analysis software,taking the new platform flyover of Huludao Station expansion transform project as a prototype,the finite element analysis model of non-guide beam and non-guide beam steel truss girder Jacking under construction was established respectively.The results show that the maximum stress during the construction of the guide beam is the non-guide beam of 0.42,and the maximum deflection during the construction of the guide beam is the non-guide beam of 0.41.In conclusion:for long span bridges,the setting of the leading beam is more conducive to controlling the stress and deflection index of the jacking construction process so as to satisfy the specification requirements.For small spans bridges,the stress and deflection of the non-guide beam in the construction process can meet the requirements of the standard,but still larger,if the guide beam is set up,the stress and deflection in the construction process can be greatly reduced,thus reducing the deflection of the bridge,which is more conducive to the use of the bridge.