基于模态参数的桥梁结构模型边界条件参数修正

ccording to the complex boundary condition of real bridge structure, appendix restrain parameters of structure boundary were detailed analyzed. The appendix horizontal and torsional restrain parameters were selected as research object. The least square constrained optimization inversion method was used to establish the question of reverse of bridge structure boundary appendix parameters based on tested and calculated mode parameters. The first order perturbation of eigen-value and eigen-vector based on matrix perturbation theory were substituted into the constrained optimization inversion equation, so the solving efficiency was improved greatly, and the iteration method was used to improve the precision. The corresponding program was made, and the example of a maglev railway girder shows that fairly well precise bridge structure boundary appendix parameters can be reserved with only former several modes parameters through four times of iteration calculation.