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| Investigation on damage diagnosis of concrete hollow slabs |
| Revised:August 15, 2000 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20014090 |
| KeyWord:concrete hollow slabs,dynamic test,damage diagnosis,fracture mechanics |
| YI Wei jian LIU Xia |
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| Abstract: |
| Based on the dynamic testing date of four prestress 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 rotation stiffness formula of 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. |
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