强震作用下砌体结构倒塌过程仿真分析
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摘要
四川汶川地震中大量砌体房屋倒塌,造成巨大人员伤亡。为研究和预防砌体结构震害,本文概述了多层砌体房屋的主要震害特点,研究了砌体结构地震倒塌分析方法、失效单元与结构倒塌等关键技术问题。利用动力有限元程序LS-DYNA模拟了砌体结构的倒塌过程。仿真计算的结果与真实倒塌过程吻合较好,说明通过合理选取计算参数和计算模型,可以对这种特殊的复杂破坏过程进行模拟分析和仿真。通过再现倒塌过程,发现了结构在强震作用下的薄弱环节,为提高砌体结构抗震性能研究、建立结构防倒塌机制提供了有力的技术支撑。
A mass of buildings,especially the masonry buildings,collapsed during the Wenchuan Earthquake.It caused the death of nearly 70000 peaple.To research and prevent the damage to masonry structure,the authors overview the earthquake damage features of imulti-story masonry buildings,analyze the simulation of collapses of masonry structure due to earthquakes and research invalid elements and key technological problems in structural collapse for analyzing it.They use LS-DYNA software to simulate the collapse of masonry structure.Computer simulation result is similar to the real collapsing process.Selecting correct parameters and module,we can simulate and analyze this complex collapsing process.Through repeating the collapsing process,we can find the weak link in the structure under an earthquake.It not only develop earthquake resistacne of structures,but also provide a full technology support in building earthquake resistance systems.
A mass of buildings,especially the masonry buildings,collapsed during the Wenchuan Earthquake.It caused the death of nearly 70000 peaple.To research and prevent the damage to masonry structure,the authors overview the earthquake damage features of imulti-story masonry buildings,analyze the simulation of collapses of masonry structure due to earthquakes and research invalid elements and key technological problems in structural collapse for analyzing it.They use LS-DYNA software to simulate the collapse of masonry structure.Computer simulation result is similar to the real collapsing process.Selecting correct parameters and module,we can simulate and analyze this complex collapsing process.Through repeating the collapsing process,we can find the weak link in the structure under an earthquake.It not only develop earthquake resistacne of structures,but also provide a full technology support in building earthquake resistance systems.
引文
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[8]周岑.考虑倒塌的钢筋混凝土桥梁地震反应全过程仿真分析研究[D].上海:同济大学,2003.
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[10]彭斌,顾祥林.砌体结构倒塌反应的图形仿真技术[J].同济大学学报,2004,32(10):15-19.
[2]Motohiko Hakuno,Kimiro Meguo.Simulation of concrete-frame collapse due to dynamic loading[J].Journal of Engineering Mechanics,1993,119(9):1709-1723.
[3]江见鲸,贺小岗.工程结构计算机仿真[M].北京:清华大学出版社,1996.
[4]Matthew Gilbert,Tom Molynesux,Brian Hobbs.Numerical modeling of unreinforced masonry walls subject to lateral Impact[C]//Proceedings of11th International Block/Brick Masonry Conference,Shanghai,1997:1250-1259.
[5]Xing J B,Cheng YM.Anumerical approach to the failure of masonry structure[C]//International Conference On Computational Methods in Struc-tural and Geotechnical Engineering,HongKong,1994:1459-1462.
[6]顾祥林,彭斌,黄庆华.结构抗震分析中的计算机仿真技术[J].自然灾害学报,2007,16(2):92-100.
[7]胡晓斌,钱稼茹.结构连续倒塌分析与设计方法综述[J].建筑结构,2006,36(S1):79-83.
[8]周岑.考虑倒塌的钢筋混凝土桥梁地震反应全过程仿真分析研究[D].上海:同济大学,2003.
[9]赵红垒.黄河淤泥多孔砖砌体结构的力学性能数值分析[D].郑州:郑州大学,2006.
[10]彭斌,顾祥林.砌体结构倒塌反应的图形仿真技术[J].同济大学学报,2004,32(10):15-19.
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