考虑几何偏差及重力影响的单层网壳冲击相似律研究  

Impact comparability rule for single layer reticulated shells considering effects of geometric deviation and gravity

作　　者：钟渝楷 姜正荣[2,3] 姚小虎[2] 石开荣[2,3] 罗斌[4] 

机构地区：[1]华南理工大学建筑设计研究院,广州510640 [2]华南理工大学土木与交通学院,广州510640 [3]华南理工大学亚热带建筑科学国家重点实验室,广州510640 [4]东南大学土木工程学院,南京211189

出　　处：《振动与冲击》2018年第3期230-236,共7页Journal of Vibration and Shock

基　　金：国家“十二五”科技支撑计划项目(2012BAJ03B06);广州市科技计划项目(201510010117)

摘　　要：根据Π定律,在考虑应变率效应的基础上,分别推导了考虑几何偏差和重力影响的相似律表达式。根据已有文献的试验模型,采用非线性有限元软件LS-DYNA建立数值模型进行对比,验证有限元分析方法的可靠性。在此基础上,分别考虑几何偏差和同时考虑几何偏差及重力的影响,建立分析模型对相似关系进行验证,并将计算结果与未修正模型进行对比。研究表明:当考虑几何偏差或同时考虑几何偏差及重力影响时,修正模型均能获得满足相似关系的结果,并较好地预测原型的动态响应,具有较高的精度;而未修正模型预测结果与原型误差很大,不能用于工程实践。According to the Π principle,based on considering the strain-rate effect,the impact comparability rule for single layer reticulated shells considering geometric deviation and gravity,respectively was derived. According to the test model published in literature,the corresponding FE numerical model was built using the nonlinear FE software LSDYNA,its computing results were compared with the test model's results measured to verify the correctness of the FE analysis method. Then FE analysis models for single layer reticulated shells were constructed using LS-DYNA only considering geometric deviation and simultaneously considering geometric deviation and gravity to verify the derived comparability rule. The computation results were compared with those of the models unmodified( not considering geometric deviation and/or gravity). It was shown that when only considering the effect of geometric deviation or simultaneously considering geometric deviation and gravity,the FE models modified can obtain the results to satisfy the comparability rule; the FE models modified can predict dynamic responses of the prototype better with a higher precision,while prediction results of the FE models unmodified have larger errors compared to those of the prototype,and they cannot be used in practical engineering.

关 键 词：相似律 单层网壳 几何偏差 重力 

分 类 号：O383[理学—流体力学]