中文摘要：

以频率作为弧形闸门主框架结构多损伤识别的主要动力参数,基于灵敏度分析方法,建立结构损伤位置及程度与结构多阶固有频率的关系矩阵,并根据此矩阵和实测频率的变化情况反解出结构的损伤位置与程度。为了反映结构不同位置的损伤对频率的影响,同时减小方程的未知量个数,给出了弧门主框架频率与损伤位置和程度的灵敏度关系图。计算结果表明：基于灵敏度分析的结构多损伤检测方法可识别弧形闸门主框架多位置发生损伤的情况,可为水工结构动力检测与损伤评估提供技术参考。

英文摘要：

Taking frequency as the main dynamic parameters identification of multiple damage of the radial gate main frame structure,the relation matrix between the natural frequencies and the structure damage location and extent was set up based on the sensitivity analysis.And the structural damage location and extent was solved based on the relation matrix and the changes of the measured frequency.In order to reflect the influence of different structural damage position on the frequency,and reduce the number of unknown variables equation,this paper gives the sensitivity relation graph of the radial gate main frame frequency and damage location and extent.The results showed that the structural multiple damage detection method based on sensitivity analysis could identify the multiple damage location of radial gate main frame,and could provide technical references for hydraulic structure dynamic detection and damage evaluation.