摘要
尽管近年来斜交网格结构体系因其良好的抗侧性能在高层建筑中广泛应用,然而目前该类结构的抗连续倒塌研究尚处于探索阶段。因其外筒斜柱是结构抵御竖向荷载和水平荷载的关键构件,为此,采用静力非线性分析和竖向增量动力分析方法,对斜交网格结构开展了基于拆除斜柱构件的抗连续倒塌分析。研究结果表明:高层建筑斜交网格结构在失效点处的位移反应较小,结构发生连续倒塌的可能性较低。在拆除底层斜柱后,竖向荷载由同层其他斜柱承担,离失效斜柱越近的斜柱承担的荷载比例越大,相应的轴力变化程度越大,同层的内筒柱轴力变化程度较小。在斜柱失效后,结构抗倒塌的承载能力和竖向刚度较大,变形能力较差。
Although diagrid structure system has been widely used in high-rise buildings in recent years due to its excellent lateral resistance, the research on the progressive collapse resistance of this kind of structure is still in the exploratory stage. As the diagrid tube is the key component of the structure to resist vertical load and horizontal load,nonlinear static analysis and vertical incremental dynamic analysis method are used to carry out the progressive collapse resistance analysis of diagrid structures based on the removal of diagonal components. The results show that the displacement response of high-rise diagrid structures at failure point is small, and the possibility of progressive collapse is low. After removing one pair of tilted column in the first story, the vertical load is borne by other diagonals in the same story. The load ratio of the tilted column closer to the failure tilted column is larger, the corresponding change ratio of axial force is larger, and the change ratio of axial force of the inner tube columns in the same story is relatively small.After the failure of tilted columns, the bearing capacity and vertical stiffness of the structure against collapse are large,and the deformation capacity is poor.
作者
刘成清
周俊辉
方登甲
LIU Chengqing;ZHOU Junhui;FANG Dengjia(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S02期386-392,共7页
Building Structure
基金
国家自然科学基金项目(51778538)
国家留学基金委项目(201707005100)
关键词
斜交结构
连续倒塌
拆除构件法
静力非线性
动力非线性
diagrid structures
progressive collapse
alternative load path method
nonlinear static analysis
nonlinear dynamic analysis
作者简介
第一作者:刘成清,博士,副教授,博士生导师,Email:lcqjd@swjtu.edu.cn。
