现浇RC梁板对因灾塌落柱的约束作用研究
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摘要
从约束作用角度,针对竖向受力构件失效导致的结构竖向连续倒塌热点问题开展研究。以理论分析、物理试验为基础,依靠修正、确认的数值模型,从力和位移、能量两个不同的角度,详细分析了现浇楼板、断柱位置、周边构件、材料强度和构件间相互作用等因素对因灾塌落柱所受约束作用的影响。结果表明:现浇楼板能够显著提高因灾塌落柱所受的约束作用,可使构件间空间相互作用得到充分发挥;最易损毁的角柱所受的约束作用最小,在设计时应予以加强;因灾塌落柱塌落的早期阶段,高强混凝土能够显著提高塌落柱所受的约束作用;基于抗塌落能的约束作用分析方法,有助于从能量角度认识竖向连续倒塌灾变过程,使定量评价损毁柱的抗塌落能力成为现实。
From the perspective of the constraint effect,the research on the vertical progressive collapse initiated from the failure of vertical force components was carried out.The analysis for the effects of cast-in-situ slab,the locations of the broken columns,the surrounding structures,the strengths of materials and the interaction between components on the collapsing column caused by the plagues was presented in detail by amending and confirming the numerical models based on theoretical analysis and the experiments.The results show as follows.The cast-in-situ RC slabs can significantly magnify the constraint effect on the collapsing column caused by the plagues.The corner columns most vulnerable to damage are under least restraint effect,therefore some reinforcement should be put on it.In the early stage of the collapse of the column,high strength concrete can significantly improve the constraint effects.The analytical method for the constraint effect based on the collapse resistance energy helps understanding of vertical progressive collapse from the viewpoint of energy,and quantitatively evaluates the ability of anti-collapse.
From the perspective of the constraint effect,the research on the vertical progressive collapse initiated from the failure of vertical force components was carried out.The analysis for the effects of cast-in-situ slab,the locations of the broken columns,the surrounding structures,the strengths of materials and the interaction between components on the collapsing column caused by the plagues was presented in detail by amending and confirming the numerical models based on theoretical analysis and the experiments.The results show as follows.The cast-in-situ RC slabs can significantly magnify the constraint effect on the collapsing column caused by the plagues.The corner columns most vulnerable to damage are under least restraint effect,therefore some reinforcement should be put on it.In the early stage of the collapse of the column,high strength concrete can significantly improve the constraint effects.The analytical method for the constraint effect based on the collapse resistance energy helps understanding of vertical progressive collapse from the viewpoint of energy,and quantitatively evaluates the ability of anti-collapse.
引文
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[2]陆新征,林旭川,叶列平,等.地震下高层建筑连续倒塌数值模型研究[J].工程力学,2010,27(11):64-70.
[3]Shi Yanchao,Li Zhongxian,Hao Hong.A New Method for Pro-gressive Collapse Analysis of RC Frames Under Blast Loading[J].Engineering Structures,2010,32(6):1691-1703.
[4]徐有邻,朱爱萍.有关结构安全的全面考虑[J].建筑结构,2006,36(11):109-111.
[5]陆新征,江见鲸.世界贸易中心飞机撞击后倒塌过程的仿真分析[J].土木工程学报,2001,34(6):8-10.
[6]徐有邻.混凝土结构理论及规范的发展[J].建筑结构学报,2010,31(6):17-21.
[7]王磊,陈以一,李玲,等.引入初始破坏的桁梁结构倒塌试验研究[J].同济大学学报:自然科学版,2010,38(5):644-649.
[8]徐赵东,时本强,巫可益,等.粘弹性多维隔减震结构竖向振动台试验与研究[J].中国科学(E辑:技术科学),2009,39(10):1709-1715.
[9]刘海卿,陈小波,王学庆,等.基于损伤指数的框架结构损伤演化研究[J].自然灾害学报,2008,17(3):29-35.
[10]王少杰.RC空间框架结构竖向倒塌全过程试验研究与数值分析[D].泰安:山东农业大学水利土木工程学院,2012.
[11]易伟建,何庆锋,肖岩.钢筋混凝土框架结构抗倒塌性能的试验研究[J].建筑结构学报,2007,28(5):104-109,117.
[12]舒赣平,凤俊敏,陈绍礼.对英国防结构倒塌设计规范中拉结力法的研究[J].钢结构,2009,2009,24(6):51-56.
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