用参数识别技术进行桥梁结构损伤识别

Bridge Structural Damage Assessment by Parameter Identificat ion

以有限元为工具,把桥梁结构模型中各单元的等效面积、惯性矩以及板壳单元的厚度作为识别参数,建立识别参数对于各种量测的灵敏度矩阵。测取结构某些部位的位移与应变,以此为基准与原先结构的分析结果进行比较,建立综合误差向量。通过优化方法调整当前计算模型的参数,使结构响应与相应的试验值最大程度地吻合,从而得到结构参数变化的信息。以此为基础实现桥梁结构的损伤判别。

With the finite element as the tool and the equivalent area, the inertia moment and the thickness of board shell unit of the beam elements as the identification parameters,the various measured sensitivity matrix corresponding to the identif ication parameters are established to measure the displacement and strain of som e structural parts.The results are compared with the previous structural analysi s to establish the comprehensive error vector. By taking the optimization method , the current computation model is adjusted to make the structure response match ing with the corresponding test value to the greatest extent, thus obtaining the information of the variation of structure parameters. On this basis, the assess ment of the bridge structure damage can be completed.