摘要
在混合试验中,当子结构边界自由度较多时,其边界条件往往难以完全实现,而边界条件的缺失势必改变原结构的受力状态,影响结构性能评估的准确性。为此,提出基于模型更新的在线数值模拟方法,称之为考虑不完整边界条件的新型混合试验方法。该方法建立具有相同本构关系的两套数值模型,分别用于整体结构数值计算和物理子结构本构模型参数识别。由于结构反应由整体结构数值模型求得,边界条件自然得到满足;而且数值模型的本构参数不断根据物理试件的试验结果在线修正,提高了数值计算的准确性。以物理试件的恢复力为追踪目标,采用基于梯度的优化方法在线估计并更新材料本构模型参数;以Matlab和Open Sees为计算平台完成了边界条件不完整的钢筋混凝土框架结构虚拟混合试验。结果表明,该方法几乎消除了边界条件不足带来的不利影响,提高了混合试验的模拟精度。
Hybrid simulation is a powerful and cost-effective technique to evaluate structural dynamic performance.However,when the boundary of a physical substructure has many DOFs,its boundary condition is difficult to be fully realized,while absence of boundary conditions is bound to change the stress state of the original structure and eventually affects the correctness of structure evaluation. Here,an online numerical simulation method based on model updating was proposed,it was called a novel hybrid simulation method considering incomplete boundary conditions. With the proposed method,two sets of numerical models with the same constitutive relation were built to be applied in the finite element（ FE） analysis of the whole structure and the constitutive model parametric recognition of a physical substructure,respectively. The boundary conditions were naturally satisfied because a structure＇s response was obtained with the whole structure＇s numerical model,and the numerical model＇s constitutive parameters were constantly modified online based on the test results of physical specimens to improve the correctness of numerical calculation. Virtual hybrid simulations of a RC frame structure under incomplete boundary conditions were conducted. The results showed that the effect of incomplete boundary conditions is almost eliminated and the accuracy of the proposed hybrid simulation is improved.
作者
吴斌
宁西占
许国山
王贞
WU Bin1,2 NING Xizhan1,2 XU Guoshan1,2 WANG Zhen1,2(1. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China; 2. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, Chin)
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第15期150-155,共6页
Journal of Vibration and Shock
基金
国家重点研发计划课题(2016YFC0701106)
国家自然科学基金(51161120360
51408157
51778190)
高等学校博士学科点专项科研基金(20132302110065)
黑龙江省自然科学基金(LC201423)
关键词
混合试验
不完整边界条件
参数识别
模型更新
hybrid simulation
incomplete boundary conditions
parametric recognition
model updating
作者简介
吴斌男，博士，教授，1970年生
