摘要
基于传统参数型模型修正方法,通过将悬索桥主缆划分为多段,并将每段主缆的弹性模量均作为独立的模型修正参数,提出了一种针对大跨径悬索桥有限元模型修正的改进方法——优化参数型模型修正方法。首先,根据对拟定参数的灵敏度计算选定灵敏度较大的参数;然后,进行多次有限元计算求取参数灵敏度矩阵;最后,优化参数识别条件,识别模型修正参数值。依托世界第一大跨径分体式钢箱梁悬索桥——西堠门大桥,建立桥梁结构有限元模型,并采用优化参数型方法进行模型修正。结果表明:修正所得模型各测点误差均小于5%,模型整体和局部响应与桥梁实际状态十分吻合,该方法可推广应用于大跨径悬索桥的模型修正。
Based on the traditional parameter-oriented model updating method,the main cable was divided into multiple segments,each segment's elastic modulus was set as an independent model updating parameter,then an improved method,parameter-optimized model updating method for updating long-span suspension bridge finite element model was proposed.Firstly,according to the calculated sensitivity of the drafted parameters,high-sensitivity model parameters were selected as model updating parameters.The parameter sensitivity matrix was obtained by the repeated finite element analysis;the condition of parameter identification was optimized and the model updating parameter was recognized.As an example,the finite element model of the Xihoumen bridge,the world's longest separated steel box girder suspension bridge,was built and updated by parameter-optimized model updating method.The results show that the error between the measuring points and the updated model is less than 5%,the whole and local responses of the model are very consistent with the actual state of the bridge.That proved the method could be applied for updating the long-span suspension bridge model.
出处
《上海公路》
2014年第4期24-28,共5页
Shanghai Highways
基金
浙江省自然科学基金项目(LQ14E080001)
浙江省交通投资集团科技项目(201101)
浙江省交通运输厅科研计划项目(2013H25)
浙江省交通运输厅科研计划项目(2012H06)
关键词
参数型模型修正
灵敏度
主缆分段
弹性模量
parameter-oriented model updating
sensitivity
main cable segment
elastic modulus
