基于信赖域算法的连续梁桥动力损伤识别

对于大型复杂的既有桥梁结构,进行整体的动力健康检测和评估存在着识别参数多,识别精度差等问题。结合有限元模型修正技术,引入有效弹性模量损伤因子和损伤分布函数的概念,通过在Matlab环境下调用ANSYS有限元程序中的APDL语言进行桥梁结构的有限元建模,利用信赖域算法调整参数,实现了对连续梁桥的动力损伤识别,数值算例表明该方法能准确、有效地判断桥梁结构的损伤发生、损伤区域以及损伤程度。

Damage Identification of Continuous Girder Bridge's Dynamic Behavior Based on Trust Region Algorithm

For large and complex bridge structure,it is existed that there are so many identified parameters and the identified precision is not enough.The effective elastic module's damage factor and the damage distributed function is introduced to solve the problem by FE model updating.By calling subprogram of the APDL language and using trust region algorithm,identification of continuous girder bridge's damage region and damage extent is realized.It is suggested that the method can correctly and effectively estimate whether bridge structure occurs damage,damage region and damage extent by a numerical example.