利用 4块预应力混凝土空心板的动力测试数据 ,对板的支承条件和损伤参数进行了识别。识别板的支承条件时 ,引入弹性支座 -质量体系 ,利用实测的前四阶固有频率作为已知信息 ,直接采用牛顿法求解。根据板的损伤特征 ,以线弹性断裂力学为基础 ,推导了混凝土构件裂缝截面转动刚度表达式。然后利用特征值灵敏度分析和实测的固有频率变化率对单条裂缝的位置及裂缝程度进行了识别 Based on the dynamic test data of four prestressed concrete hollow slabs, the bearing conditions and damage parameters of the slab are identified. When identifying the supporting condition of the plate, the elastic support-mass system is introduced, and the measured first four natural frequencies are used as known information and solved directly by Newton’s method. According to the damage characteristics of the slab, based on the linear elastic fracture mechanics, the rotational stiffness expression of the cracked section of the concrete member is deduced. Then, using the eigenvalue sensitivity analysis and the observed rate of change of natural frequency, the position and degree of cracks in a single crack are identified