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传统的有限元模型修正方法对于具有复杂多自由体系的大型桥梁结构显得束手无策,其中一个重要的原因是大型桥梁结构体系很难用有限元编程精确地表达,难以建立完整的或者缩聚的质量矩阵和刚度矩阵。该文开发了基于应用程序交互访问的有限元模型修正模式,首先在Strand7软件中建立初始的有限元模型,然后利用MATLAB建立迭代程序并调用Strand7软件,通过读写Strand7中的物理参数来更新模型,实现了大型桥梁结构有限元模型修正。该文对一座实桥进行多参考点脉冲锤击法模态试验和静载试验,基于获得的静动力试验数据和Strand7有限元模型分析结果,引入损伤函数的概念识别得到了该桥各梁的分段刚度,成功地实现了单元层次的参数识别。
One of the most important reasons for the traditional method of finite element model correction is that it is hard to describe the large-scale bridge structure with complex and free-form systems. It is very difficult to describe the large-scale bridge structural system accurately by finite element programming. It is difficult to establish a complete or polycondensation mass matrix and Stiffness matrix. In this paper, a finite element model modification mode based on interactive application program is developed. First, an initial finite element model is established in Strand7 software. Then an iterative program is created by MATLAB and the Strand7 software is called. The model is updated by reading and writing the physical parameters in Strand7 , To achieve a large bridge finite element model of the amendment. Based on the obtained static and dynamic test data and Strand7 finite element model analysis results, the concept of damage function is introduced to identify the beams of the bridge Segment stiffness, the successful realization of the unit level parameter identification.