爆炸荷载作用下框架结构的连续倒塌机理分析  

MECHANISM ANALYSIS ON PROGRESSIVE COLLAPSE OF RC FRAME STRUCTURE UNDER BLAST EFFECT

作　　者：阎石[1] 王积慧[1] 王丹[1] 张亮[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《工程力学》2009年第A01期119-123,129,共6页Engineering Mechanics

基　　金：建设部科技攻关项目(05-k1-36)

摘　　要：利用爆炸计算软件和商用有限元软件,采用有限元方法对外部地面爆炸荷载引起的钢筋混凝土框架结构的倒塌机理进行了初步研究。首先,采用爆炸模拟软件对不同炸药量和爆炸距离作用下,框架结构承受的爆炸压力进行了数值模拟。然后,使用有限元软件并采用静力移除法,对指定爆炸压力作用下的框架结构的动力响应、损伤位置和程度、连续倒塌的全过程进行数值模拟。最后,明确了爆炸荷载传递的路径、方式及引发的最终倒塌结果。数值分析结果表明:采用有限元方法可以有效模拟框架结构爆炸响应的全过程。结构损伤或倒塌破坏的程度与炸药量、爆炸距离、结构形式和抗力等因素有关。所提出的方法、结论和防范措施等为防止类似结构连续倒塌的设计提供依据。A mechanism analysis on a reinforced concrete frame structure under blast effects was numerically performed by using explosive simulation software and finite element method （FEM）. Firstly, a simulation of blast pressures on the structure is conducted considering the effect of explosives amount and explosion distance. Then, the FEM, together with the static member removing method （SMRM）, is applied to simulate numerically the whole process of dynamic responses, including damage positions, damage degrees, and progressive collapse under the given blast pressures. Finally, the load transferring mechanism and the final collapse mechanism of the frame structure were demonstrated. The numerical results show that the proposed method could effectively simulate the behavior of the structure under the blast responses. The damage degree was relatd to the amount and position of explosives, shape and resistance of the building etc. This analysis may provide a referrence for the design of anti-progressive-collapse structures.

关 键 词：爆炸效应 钢筋混凝土框架 损伤评估 连续倒塌 机理分析 

分 类 号：O383.2[理学—流体力学] TU973.214[理学—力学]