基于试验数据的吊拉组合模型桥梁有限元模型修正

发布时间：2018-03-19 04:13

本文选题：有限元模型修正　切入点：吊拉组合桥梁　出处：《土木工程学报》2014年10期 　论文类型：期刊论文

【摘要】：为获得吊拉组合模型桥梁的基准状态,结合子结构与响应面有限元模型修正方法,建立一种新的桥梁结构有限元模型修正方法。依据构造及力学特点,划分子结构并选择待修正参数;基于方差分析,利用参数显著性检验确定待修正参数;用均匀设计方法生成待修正参数样本集,由有限元分析获得对应的响应信息后,建立每一待修正参数与目标值的响应面模型;建立自振频率和位移适应度函数线性组合的联合目标函数,利用模型桥梁的静动力试验数据,由遗传算法获得参数的修正量,实现测试结果与有限元计算结果间误差的最小化。试验结果表明:所提方法能在确保设计参数合理且具有明确物理意义的前提下,对桥梁结构有限元模型实现有效的修正。
[Abstract]:In order to obtain the reference state of the bridge, a new finite element model modification method for bridge structure is established by combining substructure and response surface finite element model modification method, according to the structural and mechanical characteristics. The molecular structure is defined and the parameters to be corrected are selected. Based on variance analysis, the parameters to be corrected are determined by using the significance test of parameters. The sample set of parameters to be modified is generated by uniform design method, and the corresponding response information is obtained by finite element analysis. The response surface model of each parameter to be modified and the target value are established, the joint objective function of linear combination of natural vibration frequency and displacement fitness function is established, and the modified parameter is obtained by genetic algorithm using the static and dynamic test data of the model bridge. The experimental results show that the proposed method can effectively modify the finite element model of bridge structure on the premise that the design parameters are reasonable and have clear physical significance.
【作者单位】：西南交通大学;
【基金】：国家重点基础研究发展计划(2013CB036300-2) 国家自然科学基金(51078316) 四川省科技计划项目(2011JY0032) 铁路科技研究开发计划项目(2011G026-E,2012G013-C)
【分类号】：U441

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