Force bearing performance test of precast segmetal bridge beams with different tendon ratios under different loads(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年01期
- Page:
- 58-68
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Force bearing performance test of precast segmetal bridge beams with different tendon ratios under different loads
- Author(s):
- YUAN Ai-min; HEYu; DAI Hang; SUN Da-song
- 1. School of Civil and Transportation Engineering, Hohai University, Nanjing 210098, Jiangsu,China; 2. School of Civil Engineering, Southeast University, Nanjing 210096, Jiangsu, China; 3. Jiangsu Province Communications Planning and Design Institute Limited Company, Nanjing 210005, Jiangsu, China
- Keywords:
- bridge engineering; segmental prestressed concrete beam (SPCB); hybrid tendon; combined load; structural behavior; bending bearing capacity
- PACS:
- U441
- DOI:
- -
- Abstract:
- Segmental prestressed concrete beams (SPCB) with hybrid tendons have been widely used in construction of bridge structures, and the performance of which is affected by two important factors: tendon ratio and combined load (bending and shear). This paper presented an experimental investigation of structural behaviors of SPCB under four different tendon ratios and two types of loads. Comparison between this test results and the similar tests at home and abroad was carried out, and a new calculation formula of flexural bearing capacity was presented. The results show that the maximum deflection and the joint opening location are different under different types of load. The interaction of shearing and bending reduces the vertical load and vertical deflection, and the concentrated loading increases the height of compressive region for beams and the width of joint opening. For beams with different tendon ratios, the more internal tendons it has, the higher the cracking moment and the failure moment are, and the greater the height of compressive region is, the smaller the width of joint opening will be. Furthermore, the stress increment of external tendons is approximately 35%-55% of the ultimate strength. When the segmental beam is subjected to concentrated load and the reinforcement ratio ρ is less than 2%, flexural failure occurs after concrete crushing. When the reinforcement ratio ρ is greater than 2%, flexural and shear failure occurrs, and there is a sliding between segments. If beams are subjected to one-third loading, only flexural failure occurrs. Formula presented in this paper is in accordance well with the test results on the basis of considering fully of the ultimate stress of prestressed steel and the effect of prestressed steel in compressive region.
Last Update: 2016-02-01