超高层框架–核心筒结构抗连续倒塌性能分析

Analysis of progressive collapse resistance of ultra high-rise frame-core tube structure

利用ETABS有限元软件对某232 m超高层建筑进行抗连续倒塌性能分析,采用非线性静力和非线性动力拆除构件对结构进行连续倒塌分析,并比较两种方法下拆除构件的弯矩值和位移值。分析结果表明,使用非线性静力分析时,拆除角柱的最大塑性转角θ=2.41°,短边中柱最大塑性转角θ=2.16°,长边中柱最大塑性转角θ=0.73°,都没有达到最大塑性转角的限值;使用非线性动力分析,拆除角柱的最大位移为58.322 mm,拆除短边中柱最大位移为51.254 mm,长边中柱最大位移为45.026 mm,均未达到构件破坏的最大位移值。

This paper uses ETABS finite element software to analyse the performance of a 232 m super tall building against continuous collapse,using non–linear static and non–linear dynamic demolition members for continuous collapse analysis of the structure,and comparing the bending moment values and displacement values of the demolition members under the two methods.The results of the analysis showed that the maximum plastic angle of the demolished corner column wasθ=2.41°,the maximum plastic angle of the short side centre column wasθ=2.16°and the maximum plastic angle of the long side centre column wasθ=0.73°when using the non–linear static analysis,all of which did not reach the maximum plastic angle limit.Using the non–linear dynamic analysis,the maximum displacement of the demolished corner column was 58.322 mm,the maximum displacement of the demolished short side centre column was 51.254 mm and the maximum displacement of the long side centre column was 45.026 mm,neither of which reached the maximum displacement value for member damage.