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爆炸荷载作用下简支梁的动力响应分析

发表时间:2013-02-15  浏览量:1268  下载量:516
全部作者: 胡世高,卜荣丽,段卫东
作者单位: 武汉科技大学理学院
摘 要: 采用爆炸动力学和振动力学研究简支梁在爆炸载荷作用下复杂的动态响应,得出简支梁在爆炸载荷作用下的响应分为2个阶段——有荷载作用的受迫振动阶段及无荷载作用的自由振动阶段。随后建立扰度和应力之间的关系式,得到2个振动阶段任意时刻梁上某一点的弯曲应力,这为判断梁是否屈服提供了依据。最后,通过一个具体算例分别将理论推导结果和数值模拟结果进行比较,得到在受迫振动阶段两最大挠度相差8%左右,自由振动阶段两者相差10%左右。
关 键 词: 工程力学;动力响应;数值模拟;理论计算
Title: Dynamic response analysis of a simply supported beam under blast loading
Author: HU Shigao, BU Rongli, DUAN Weidong
Organization: College of Science, Wuhan University of Science and Technology
Abstract: Explosive dynamics and vibration mechanics theory were used to analyse the complex dynamic response of a simply supported beam under blast concentrated loading. The analysis showed that the reponse of a simply supported beam under blast concentrated loading had two stages, the first one was forced vibration under blast concentrated loading and the second one was free vibration. Then the relationship between deflection and stress was established to get the stress of one point at either stage that provided basis to judge whether the beam was damaged. At last, the relative errors of the maximum deflection were about 8% at the first stage and about 10% at the second stage by comparing theoretical results with numerical simulation results of a specific example.
Key words: engineering mechanics; dynamic response; numerical simulation; theoretical calculation
发表期数: 2013年2月第3期
引用格式: 胡世高,卜荣丽,段卫东. 爆炸荷载作用下简支梁的动力响应分析[J]. 中国科技论文在线精品论文,2013,6(3):263-267.
 
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