Damage Detection Method of Simply Supported Beams Based on Difference of Nearby Difference Curvature Index
Key Laboratory of Building Structural Retrofitting and Underground Space Engineering of Ministry of Education, School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China
| Abstract: | In order to improve the effectiveness and convenience of damage identification of two-span continuous beams, a new damage identification index Di based on the deflection data of beam under concentrated load, which takes local flexural stiffness and shear stiffness as damage identification parameter, was proposed. The damage detection method based on Di includes four main steps: arranging vertical deflection measurement points at equal intervals on the beam body and applying a concentrated load F at the mid span position of one of the spans. After measuring the yi value at each measurement point, the differential deflection curvature value 1/ρi can be calculated; After obtaining specific values of Di according to the definition, a graph with Di as the vertical coordinate and the positions of each measuring point on the longitudinal axis of the beam as the horizontal coordinate can be drawn; The mutation position on the graph can indicate the location of the damage: if the mutation starts from point j, it indicates that the damage occurs in the area between measurement points j+1 and j+2; By selecting any two values from Di-1, Di, and Di+1 and solving the corresponding definition equation simultaneously, the degree of beam damage characterized by the relative change in local stiffness can be determined. The results of numerical example validation indicate that this method has good damage identification performance. |
| Keywords: | Building Structure; Continuous Beam; Damage; Deflection; Curvature |
| DOI: | 10.57237/j.cear.2023.01.005 |
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Received: 27 April 2023
Accepted: 16 May 2023
Published Online: 25 May 2023
Funding
| 1. | 长江学者和创新团队发展计划教育部创新团队 (IRT13075) |
| 2. | 山东省高等学校土木结构防灾减灾协同创新中心项目 (XTP201924) |
| 3. | 山东建筑大学博士科研基金项目 (XNBS1205) |
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