Destructive test on mechanical behavior of existingprestressed wide hollow slabs(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年04期
- Page:
- 64-70
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Destructive test on mechanical behavior of existingprestressed wide hollow slabs
- Author(s):
- YI Hanbin; LI Chuanxi; WU Houxuan; JIANG Xianglin
- (1. School of Civil Engineering, Changsha University of Science and Technology, Changsha 410076, Hunan,China; 2. Jiangxi Ganyue Expressway CO. LTD, Nanchang 330025, Jiangxi, China;3. Jiangxi Transportation Institute, Nanchang 330200, Jiangxi, China)
- Keywords:
- bridge engineering; hollow slab; destructive test; ultimate bearing capacity; nonlinear finite element analysis
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to accurately evaluate the bearing capacity performance of wide hollow slab, based on Changzhang Highway reconstruction and expansion project, a prototype test of two prestressed concrete wide hollow slabs in service for 20 years has been carried out with the opportunity of demolition and reconstruction of Xiaojiang Bridge. In this experiment, two 1 500 kN jacks were used to load the hollow slabs until the specimens were damaged, the failure modes of the components and the relationship between the deflections and strains during the loading process were analyzed. Based on the degradation of layered shell element method, a finite element analysis program considering the consideration of material and geometric nonlinearity was compiled, and the program was used to simulate the whole process of the test. The results show that the failure mode of the component is crushed by the roof concrete, and the typical bending structure of the middle cross section is formed by the plastic hinge，the cracking load of No.1 and No.2 beam is 360 and 320 kN, the corresponding deflection is 22 and 16 mm respectively. While loading to failure, the failure load of No.1 and No.2 is 880 and 800 kN, the corresponding deflection is 556 and 540 mm respectively, which shows that the component has better ductility. The cracking and failure loads calculated by the numerical simulation are 360 and 920 kN, which is 1.00 and 1.05 times as much as that of the test value of No.1, 1.13 and 1.15 times as much as that of the test value of No.2. The numerical simulation results are in good agreement with the experimental results, which shows that the nonlinear finite element program developed by the authors can simulate the whole failure process of the prestressed reinforced concrete flexural members well, according to the test results and theoretical calculations, the live load factors of No.1 and No.2 beams are 3.16 and 2.77, and the safety factors are 1.57 and 1.43 respectively, indicating that the component has good bearing capacity. 2 tabs, 11 figs, 23 refs.
Last Update: 2018-08-03