砌体结构地震倒塌过程仿真及抗倒塌影响因素

发布时间：2018-09-10 08:32

【摘要】：在强震中砌体房屋易倒塌,为了对其倒塌过程仿真及对影响结构倒塌的因素进行分析,采用显式动力有限元软件ANSYS/LS-DYNA,对某结构模型进行倒塌过程仿真;同时分析了构造柱、砂浆强度、开洞率、块体密度以及窗间墙与窗下墙的刚度比等因素对砌体结构抗倒塌性能的影响。结果表明:在地震作用下,由于门窗洞口处易出现应力集中,故门窗洞口四角处先发生破坏;构造柱可以提高砌体结构的变形能力和整体性;一定程度上,砂浆强度越高,结构越难倒;墙体开洞率越大,越容易倒塌;块体强度一定时,密度相对较小有利于抗倒塌;当窗间墙与窗下墙的刚度比小于1.0时,窗间墙先于窗下墙破坏,窗间墙的破坏会加速结构的倒塌。
[Abstract]:Masonry buildings are prone to collapse during strong earthquakes. In order to simulate the collapse process of masonry buildings and analyze the factors affecting the collapse of structures, a structural model is simulated by explicit dynamic finite element software ANSYS/LS-DYNA, and the structural columns are analyzed. The effects of mortar strength, opening rate, block density and the ratio of stiffness between the window wall and the wall under the window on the collapse resistance of masonry structure are discussed. The results show that, due to the stress concentration at the openings of doors and windows, the damage occurs at the four corners of the openings of doors and windows, the deformation ability and integrity of masonry structures can be improved by structural columns, and the strength of mortar is higher to a certain extent. The more difficult the structure is, the greater the opening ratio of the wall is, the easier it is to collapse; the smaller the density of the block is when the strength of the block is constant, the less the stiffness ratio between the window wall and the wall under the window is less than 1.0, the earlier the wall between the windows is destroyed than the wall under the window. The destruction of the window wall accelerates the collapse of the structure.
【作者单位】：重庆大学土木工程学院;重庆大学山地城镇建设与新技术教育部重点实验室;
【基金】：国家科技支撑计划项目(2009BAJ28B01-02) 中央高校基本科研业务费专项资金项目(CDJXS11201167,CDJXS11200010)
【分类号】：TU364;TU352.11

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