基于能量原理的建筑物爆破振动破坏机理及研究思路
首发时间:2009-07-01
摘要:爆破地震效应是一个包含建(构)筑物本身以及爆破地震波多种因素的综合性现象。在分析爆破地震波特性和建筑物受震破坏机理的基础上,将爆破地震波产生、传播及对建筑物的影响看作一种能量传递和转化的过程,构建了以能量原理为基础的爆破地震效应研究模型。针对建筑物受震能量破坏机理的研究表明,最大瞬时输入能量能较好的表达能量和结构位移的关系,同时也很好的体现了爆破振动三要素及结构动力特性对建筑物受震破坏的影响。另外,在对研究问题实体模型和简化理论模型分析讨论的基础上,提出基于能量原理的建筑物爆破振动破坏研究的总的思路如下:以能量为主线,从爆破过程(能量源)和传播介质出发,研究爆破地震波的特征,其次研究建筑物对爆破地震波的响应特征,最后研究爆破地震效应的评价和控制。
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Failure mechanism and research ideas for structure under blasting vibration based on energy theory
Abstract:The blasting seismic effect is a comprehensive phenomenon which includes such factors as characteristics of blasting vibration and structures. Characteristics of blast-induced seismic and failure mechanism of buildings under blasting vibration are analyzed. Considering the birth, dissemination, and effect of blast-induced seismic as a transferred and transformed process of energy, a model for studying effect of blast-induced seismic is established based on energy theory. The research on failure mechanism shows that the maximal momentary input energy can express the relationship between energy and displacement of structure, and can reflect the influence of three parameters of blasting vibration and characteristics of structure on building damage. After analyzing and discussing the solid and theoretical model of the problem, a research ideal for studying structure failure under blasting vibration based on energy theory is put forward. This idea suggests that energy is focused on when studying blasting seismic effect. Firstly, characteristics of blasting vibration are studied in terms of energy source and dissemination medium. Then the dynamic response of buildings, especially the energy response is analyzed and discussed. At last, a method of safety assessment on blast-induced seismic must be proposed.
Keywords: blasting vibration energy theory structure failure mechanism research ideals
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