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悬挑桁架的高空安装和整体落架是工程施工中的重难点。工程地上部分的悬挑桁架总质量约2 800余吨,悬挑长度约13 m,采用独立支撑架高空原位安装,总落架结构面积约10 000 m2,有16部胎架参与落架。根据落架原则,结合现场整体施工进度,悬挑结构的落架方式为“分区、分级、等值”落架。根据主体结构的核心筒,将悬挑钢结构参与落架的16个落架点分成两个区,分批等值落架,每一级的落架量为10 mm。为准确模拟施工过程中构件的力学性能,使用有限元分析软件MIDAS-GEN,模拟分析悬挑桁架安装和落架施工的全过程。根据真实施工情况,利用多个落架荷载步模拟实际每一步落架工况,最后分析数字化落架结果,评价实际落架对主体结构的影响。数字化模拟分析中考虑了悬挑结构与支撑结构的相互作用,使计算更加接近实际。
Overhanging truss overhead installation and overall fall is a heavy construction project of the difficulties. The total weight of the overhung truss above the ground is about 2,800 tons and the length of the cantilever is about 13 m. The independent cantilever truss is installed in situ at high altitude with a total landing structure of about 10 000 m2. According to the principle of landing gear and the overall construction progress of the site, the way of landing of the cantilever structure is “partitioning, grading and equivalence”. According to the core structure of the main structure, the 16 landing points involved in the falling of the cantilevered steel structure are divided into two zones, and the equivalent of falling gears is provided in batches. The falling amount of each landing gear is 10 mm. In order to accurately simulate the mechanical properties of the components during the construction process, finite element analysis software MIDAS-GEN was used to simulate the whole process of cantilever truss installation and landing gear construction. According to the actual construction situation, using a plurality of landing gear steps to simulate each actual landing gear condition, and finally analyze the digital landing gear results to evaluate the impact of the actual landing gear on the main structure. The numerical simulation analysis considers the interaction between the cantilever structure and the support structure, which makes the calculation more realistic.