基于多尺度建模的高铁站雨棚结构抗连续倒塌分析  

Analysis on Progressive Collapse Resistance of Canopy Structure of High-speed Railway Station Based on Multi-scale Modeling

作　　者：刘传平[1,2] 吴邑涛 杨兴据 邱璐 林峰 LIU Chuan-ping;WU Yi-tao;YANG Xing-ju;QIU Lu;LIN Feng(College of Civil Engineering,Tongji University,Shanghai 200092,China;Tongji Architectural Design(Group)Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]同济大学建筑设计研究院(集团)有限公司,上海200092

出　　处：《建筑科学与工程学报》2022年第3期92-100,共9页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51578399)。

摘　　要：高速通过的失控列车是高铁站雨棚结构的倒塌风险源,对雨棚结构进行抗连续倒塌分析具有重要意义。为兼顾有限元分析的精度和效率,引入一致多尺度有限元结构建模方法,通过算例验证其应用于结构倒塌动力分析的合理性与准确性。以某高铁站的2个雨棚结构为背景,选取易受失控列车影响的区域建模,利用LS-DYNA建立多尺度模型。采用拆除构件法分析拆除柱后剩余结构的非线性动力行为,以考察雨棚结构的抗连续倒塌性能。结果表明:对于钢结构屋盖雨棚而言,拆除边柱、次边柱和中柱后,拆柱点竖向位移分别为17.6、13.1、12.4 mm,对应的梁端转角依次为0.0015、0.0011、0.0011 rad,均小于规范限值0.0096 rad,即钢结构屋盖雨棚在3种拆柱情形下均未发生倒塌;对于钢筋混凝土屋盖雨棚而言,拆除边柱和次边柱后,结构均发生了局部坍塌,但坍塌未延续,即不会发生连续倒塌;拆除中柱后,拆柱点竖向位移为88.6 mm,对应的梁端转角为0.0077 rad,小于规范限值0.04 rad,即钢筋混凝土屋盖雨棚结构变形较小,未发生倒塌。The out-of-control train passing at high speed is one of the collapse risk sources of the canopy structure in the high-speed railway station.It is of great significance to analyze the progressive collapse resistance of the canopy structure.In order to balance the accuracy and efficiency of the finite element analysis,the consistent multi-scale finite element modeling method was applied,and the rationality and accuracy of this method applying to dynamic analysis of structural collapse were verified by the numerical example.Taking the two canopy structures of a high-speed railway station as examples,the area susceptible to the out-of-control trains was selected as the modeling area,and a multi-scale model was established using LS-DYNA.To investigate the progressive collapse resistance property of the canopy structures,the nonlinear dynamic behavior of residual structure after column removal was analyzed using alternate path method.The results show that for the steel roof canopy,the vertical displacement at the removal columns are 17.6,13.1,12.4 mm after removing the side column,reciprocal second column and middle column,associating with the rotation of their beam end of 0.0015,0.0011,0.0011 rad respectively,which are all less than the limit value of 0.0096 rad specified in the code.As a result,the structure does not collapse under the three scenarios of column removal.For the reinforced concrete roof canopy,after the removal of side column and reciprocal second column,the structure partially collapses.However,the collapse does not spread,resulting in no progressive collapse.After removing the middle column,the vertical displacement of the removal column is 88.6 mm,and the corresponding rotation of the beam end is 0.0077 rad,which is far less than the limit value of 0.04 rad specified in the code and means no happening of collapse.

关 键 词：一致多尺度建模 雨棚 连续倒塌 拆除构件法 显式求解 

分 类 号：TU29[建筑科学—建筑设计及理论]