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上海港国际客运中心SB11建筑的大跨度屋面钢桁架安装是其施工过程中起控制作用的环节,需要确定合理的安装方案。根据结构的特点和现场施工条件,选择整体提升的方法进行安装,并制定了相应的方案。同时基于三维有限单元法,根据结构中Q345B钢材的力学性质,采用Bernoulli-Euler梁单元建立了仿真分析模型,对桁架进行了特征值屈曲分析,为现场施工的稳定性控制提供定量的参数依据;对吊点不同位移差下的桁架结构进行了仿真计算分析,给出了吊点位移差警戒限值用于指导现场施工。实践证明仿真分析得出的参数精确合理,保证了结构施工的安全性。
The installation of long-span steel truss girders at the SB11 building at Shanghai International Port Terminal is a part of the control process during the construction. It is necessary to determine a reasonable installation plan. According to the characteristics of the structure and on-site construction conditions, choose to enhance the overall installation method, and developed a corresponding program. At the same time, based on the finite element method of three dimensions, according to the mechanical properties of the Q345B steel in the structure, the Bernoulli-Euler beam element is used to establish the simulation analysis model, and the eigenvalue buckling analysis of the truss is carried out to provide the quantitative parameter basis for the stability control of the on-site construction. The truss structure under different displacement difference of lifting point is simulated and analyzed, and the warning limit of displacement difference of lifting point is given to guide on-site construction. Practice has proved that the parameters obtained by simulation analysis are accurate and reasonable, ensuring the safety of structural construction.