大跨空间网格结构旋转提升施工数值分析
Numerical Analysis of Rotational Lifting Construction for Long-Span Spatial Reticulated Structures
将旋转提升施工技术应用于大跨空间网格结构施工中,可大幅降低拼装胎架的高度和高空作业工作量。本文对某大跨空间网格结构的旋转提升施工全过程进行数值模拟,并通过建立拼装胎架用量的函数对旋转角度进行优化分析,采用反分析法确定结构最终的拼装位形;分析了被提升结构脱胎后在空中旋转提升至设计位形以及整体提升至设计标高的施工全过程;最终得到旋转提升过程各阶段钢绞线索力与结构位移,该数值分析结果与实测值基本一致。研究结果表明,通过反分析法确定结构拼装位形,可有效避免脱胎时被提升结构的刚体位移;本文提出的数值分析方法可以准确地模拟屋盖钢结构旋转提升施工全过程,数值模拟方法得到的结构全过程的受力及变形值与施工实测值基本一致,对实际工程的精细化分析和施工精度控制具有指导意义。
The application of rotational lifting construction technology in the construction of long-span spatial reticulated structures can significantly reduce the height of assembly jigs and the workload of high-altitude operations. This paper conducts numerical simulations of the entire process of rotational lifting construction for a long-span spatial reticulated structure. By establishing a function for the quantity of jigs, optimization analysis of the rotation angle is performed, and the final assembly configuration of the structure is determined using the reverse analysis method. The entire construction process, including the detachment of the lifted structure from the jigs, its rotational lifting into the designed posture in the air, and its overall lifting to the designed elevation, is analyzed. The cable forces and structural displacements of the steel strand at various stages of the rotational lifting process are obtained, and the measured values are basically consistent with the numerical analysis results. The research shows that determining the structure's assembly configuration through the reverse analysis method can effectively avoid rigid body displacement of the lifted structure during detachment. The numerical analysis method proposed in this paper can accurately simulate the entire process of rotational lifting construction for roof steel structures. The force and deformation values of the structure throughout the process obtained by the numerical simulation method are consistent with the actual measured values during construction, providing practical guidance for the refined analysis and construction accuracy control of actual projects.
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