Sensitivity analysis of cracking factors for the bottom slab crack of the pre-tensioned PC hollow slab girder bridge(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年06期
- Page:
- 56-61
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Sensitivity analysis of cracking factors for the bottom slab crack of the pre-tensioned PC hollow slab girder bridge
- Author(s):
- FENG Qi
- School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China
- Keywords:
- bridge engineering; cracking factor; pre-tensioned PC hollow girder bridge; principal tensile stress; sensitivity analysis
- PACS:
- U443.3
- DOI:
- -
- Abstract:
- To profoundly study the crack mechanism, quantify the influence and sensitivity of different factors on the principal tension stress of bottom beam cracks in PC hollow girders and the control of the bottom slab crack of these girders in designing, constructing and operating processes, a 3×20 m simply supported bridge was used as the background to establish the multi-beam and the single-beam finite element model by MIDAS FEA with its relevant rotating crack model. The multi-beam model considered one side girder and two middle girders, while the single-beam girder only considered the single beam bearing situation. Factors such as prestress tendon position deviation, prestress losing, overloading, concrete strength reduction, overall temperature difference and bearing separation were analyzed to check the influence on the principal tension stress and a linear regression model was used to compare the sensibility among different factors. The results show that the prestress loss factor plays the key influencing role to the principal tensile stress of bottom beam and it is also influenced by the factors of overload, overall temperature difference and bearing separation. Effects of prestress tendon position and concrete strength are not significant. The single beam bearing can lead to a bad bottom stress situation for the bottom beam which will aggravate the crack phenomenon. The comparison and conclusion can provide reference for the crack phenomenon of prestressed concrete hollow slab beam bridge.
Last Update: 2016-12-02