使用无形变单元的复杂钢结构施工分析方法

Staged Construction Analysis of Complex Steel Structures Using Non-morphed Element

施工过程对大跨复杂结构的受力及变形影响显著,针对施工中复杂钢结构存在大量预制构件的特点,提出可模拟预制构件行为的无形变单元结构非线性施工分析方法。基于PEP梁柱单元理论,提出了无形变单元刚度矩阵的计算方法、单元施工分析激活步骤及“一单元一构件”的建模方法。通过大跨结构施工分析算例,与传统生死单元与分步建模法计算结果对比,证明不考虑累积施工变形对预制构件影响的传统施工模拟方法会低估结构关键部位的内力和变形,导致不安全的设计结果。所提出方法可准确模拟预制构件对其余结构部分的影响及其相互作用,施工分析步骤简单,分析效率高,是结构非线性施工分析的有效方法。

Many prefabricated members and components are used in complex long-span steel constructions.The building procedure has a significant impact on the internal forces and structural deformations.Deformations accumulated during construction would alter the original configuration and tension of the prefabricated parts.Current construction analysis approaches,which often neglect the effects of cumulative deformations on prefabricated units,are incapable of effectively predicting the interactions between freshly installed units and existing structural sections.Based on the theory of the PEP beamcolumn element,a non-morphed beam-column construction analysis technique with the one-element-one-member modelling approach is suggested to properly predict the performances of long-span steel structures.The nonlinear construction stage analysis element activation procedure is depicted.Two examples are provided to show the proposed method’s correctness.The comparisons between the suggested technique and the standard methods show that the proposed method can assess the behaviors of prefabricated components and their impacts on existing members swiftly and precisely.The approach is simple and easy to apply in nonlinear staged construction analysis.