焊接结构响应的多目标模拟及模型修正敏感参数分析

本文主要研究复杂结构模拟和模型修正过程中的两个关键问题,即多级目标一致逼近模型的建立和模型修正的敏感参数分析.研究过程针对一个焊接结构钢桁架的缩尺试样进行,利用该钢桁架结构试验提供的多目标一致逼近建模和模型修正所需的结构细节和试验测试结果,研究这类焊接结构的多目标模拟过程,使建立的模型能够同时逼近三个测试目标,即钢桁架结构的整体动力特性、构件名义应力和焊接细节处的局部热点应力;并通过影响因素计算分析探讨该模型修正过程中需要考虑的主要敏感参数.研究结果表明,钢桁架结构的约束参数、焊接结构的焊缝厚度和焊缝弹性模量是模型修正中应该考虑的主要参数.以上分析结果为这类结构的多目标模型修正奠定了基础.

Multi-objective Modeling of Welded Structures and Analysis on Sensitive Model Parameters

Two key issues of complex structural modeling and model updating are studied in this paper,which include the development of structural model to simulate multiply objectives of the structural response and analysis on sensitive parameters for model updating.The research is performed with a steel truss with typical welded details in reduced scale,which is experimental studied for the purpose of providing test data for this research.The FE model of the truss is developed to describe accurately the three tested results of the structural response,that is,dynamic properties,nominal stresses of structural components and local hot stresses on the welded details.The main sensitive parameters of model updating selected through analysis of influencing factors are preliminarily identified as the weld thickness,Young's modulus of welds and boundary condition of the steel truss.The obtained results from the analyses on model parameter sensitivity would be useful for the further research on the model updating with multi-objectives and multifactor.