适于大型工程结构的移动变载荷等效冲击加载方案研究  

Investigation on equivalent impact load scheme of moving variable load for large engineering structure

作　　者：艾海峰[1] 陈志坚[1] 王路[2] 

机构地区：[1]海军工程大学船舶与动力学院,湖北武汉430033 [2]海军装备研究院舰船论证研究所,北京100161

出　　处：《舰船科学技术》2009年第5期31-34,共4页Ship Science and Technology

摘　　要：为探讨移动载荷作用下的大型工程结构采用标准有限元程序进行动态响应分析的可行性,提出了移动变载荷的冲击等效加载方案,将时变连续移动载荷等效为一系列作用位置及有效作用时间均不同的冲击载荷,加载在有限元模型上进行结构的动态响应分析。以分析移动载荷作用下梁的动态响应为例,验证了该冲击等效加载方案的可行性,分析了积分步长及载荷离散时间步长对计算结果的影响,指出在一个载荷离散时间步长内,采用8个左右的积分步长,可保证计算精度。该等效方案可以拓展到移动载荷作用下的大型结构动态响应有限元分析。The equivalent impact load scheme of moving variable load is presented to make a study of the feasibility of the dynamic response analysis of the large engineering structure under moving loads using standard finite element packages. The time varying,continuous,moving load is transformed into a series of equivalent impact loads with different loading positions and effective acting time, exerting on the finite element model for the dynamic response analysis. With an example of a beam under moving load, the feasibility of the equivalent scheme is validated. The effect of integration time steps and load discrete time steps is discussed. The computational accuracy can be satisfied as a load discrete time step covers about 8 integration time steps. The work will be extended to the dynamic response analysis of the large engineering structure under moving loads using standard finite element packages.

关 键 词：移动变载荷 等效冲击载荷 动态响应 

分 类 号：O39[理学—工程力学] P75[理学—力学]