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大跨空间结构的落架施工是将结构由支撑受力转换为结构自身受力(设计状态)的过程,其落架方案合理与否对结构受力过渡、施工安全具有直接影响。采用MIDAS/GTS软件对人行天桥落架过程进行模拟,通过调整临时支撑的弹性模量来模拟分级落架时的工况并制定出合理的落架方案。落架施工时,对桁架结构的变形和应变进行实时监测以保证结构平稳过渡。通过实测挠度、应变与计算挠度、应变的对比可知,整个落架过程结构受力过渡平缓;说明通过软件模拟来指导落架施工准确可行。
The long-span space structure landing gear construction is the process of transforming the structure from supportive force to structural self-stressing (design state), and the reasonableness of its falling scheme has a direct impact on the structural force transition and construction safety. The MIDAS / GTS software is used to simulate the pedestrian bridge falling process, and the elastic modulus of the temporary support is adjusted to simulate the working condition of the grading falling gear and to develop a reasonable fall scheme. When landing construction, real-time monitoring of the deformation and strain of the truss structure to ensure a smooth transition of the structure. Through the comparison of measured deflection, strain, calculated deflection and strain, we can see that the stress of the entire falling frame structure transitions gently. It is proved that the construction of the falling frame is accurate and feasible through software simulation.