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以中车科技文化展示中心大型空间管桁架钢结构项目为研究对象,通过敏感性分析,合理选取结构关键构件,并运用等效荷载瞬时卸载法对各失效工况下的剩余结构进行连续倒塌的动力分析,评估结构抗连续倒塌的能力。此外,探讨在不同荷载、不同最大应力比情况下,结构动力放大系数值变化的规律。分析结果表明:该结构在采用备用荷载路径设计法进行抗连续倒塌分析时,等效荷载P的加载时间t0取30倍剩余结构自振周期可以满足精度要求;在静力分析时,结构动力放大系数值随结构最大应力比增大而增大,随作用荷载的增大而减小。
Taking the large-scale space tube truss steel structure project of the Center of Science and Technology of China Automotive Technology and Culture Exhibition as the research object, through the sensitivity analysis, the key components of the structure are selected reasonably and the residual structures under failure conditions are continuously collapsed using the equivalent load instantaneous unloading method Dynamic analysis to assess the ability of the structure to withstand continuous collapse. In addition, the law of the dynamic amplification factor of the structure under different load and different maximum stress ratio is discussed. The analysis results show that the structure can satisfy the accuracy requirements when the backup load path design method is used to carry out the anti-continuous collapse analysis, and the loading time t0 of the equivalent load P is 30 times of the natural period of the remaining structure. In the static analysis, The value of the coefficient increases with the maximum stress ratio of the structure and decreases with the increase of the acting load.