摘要
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。
Based on the dynamic testing data of four prestressed concrete hollow slabs, this paper presents the results of parameter identification on boundary conditions and damage states of the slabs. In the identification of boundary conditions, the support of the slabs are simulated as an elastic support-mass system and the first four order natural frequencies are used as input information in identification. Based on the linear fracture mechanics, the rotational stiffness formula for the cracking section in a concrete beam or slab is developed. Then the location and degree of single crack in the slabs are identified by the eigenvalue sensitivity analysis and the increment of the measured frequencies.
出处
《计算力学学报》
EI
CAS
CSCD
北大核心
2001年第4期458-462,共5页
Chinese Journal of Computational Mechanics
基金
国家自然科学基金资助项目 ( 5 99780 1 5 )
关键词
混凝土空心板
动力测试
损伤诊断
断裂力学
工程结构
牛顿法
Cracks
Dynamic mechanical analysis
Eigenvalues and eigenfunctions
Fracture mechanics
Fracture testing
Prestressed beams and girders
Prestressed concrete
Stiffness
