东南大学学报（英文版）2023，Vol.39Issue(4)：323-332,10.DOI:10.3969/j.issn.1003-7985.2023.04.001
基于谱元法的周期连续梁接头竖向刚度损伤识别
Damage identification for vertical stiffness of joints of periodic continuous beams based on spectral element method
摘要
Abstract
Continuous beam bridges deteriorate during service because of environmental conditions.The stiffness of the supports of the continuous beam degenerates or even fails,severely affecting normal use.To identify the damage to the supports of periodic continuous beams,a damage identification method for vertical stiffness of the joints of periodic continuous beams based on the spectral element method(SEM)is proposed.The beam element adopts an Euler beam,with each cell comprising a beam unit and a joint.The dynamic stiffness matrix of a cell in a beam element is obtained using the SEM.Combined with the joint equilibrium equations,the transfer matrix of a periodic continuous beam can be established.The propagation constant is obtained by solving the eigenvalues of the transfer matrix.An objective function based on the propagation constant is proposed to identify the vertical stiffness damages of the joints of a periodic continuous beam using the interior point method.The proposed method is extensively validated through numerical case studies.Results demonstrate that this method can accurately identify the position and degree of damage to the vertical stiffness of a joint for single-and multi-parameter damage identification.关键词
接头/周期连续梁/波传播/谱元法/传播常数Key words
joints/periodic continuous beam/wave propagation/spectral element method/propagation constant分类
建筑与水利引用本文复制引用
朱宏平,申泽辉,翁顺..基于谱元法的周期连续梁接头竖向刚度损伤识别[J].东南大学学报（英文版）,2023,39(4):323-332,10.基金项目
The National Natural Science Foundation of China(No.52078233,51838006). （No.52078233,51838006）
