Influences of Installment Tensioning Technology on Bearing Capacity of Rectangular Prestressed Concrete Beam

Abstract

To obtain the relationship between use of installment tensioning technology and the bearing capacity of prestressed concrete beams, tensile and cyclic loading tests are conducted on five rectangular prestressed concreted specimens. Two types of prestressed tensioning methods are adopted in the tests, one uses installment tensioning technology to tension beams on days 4, 12, and 8, 12, respectively, and the other adopts the conventional method to tension the beam on day 28 only. The age of concrete, number of times tensioned, and the prestress value of early tensioning are considered in tests. Results show that use of installment tensioning technology has no effect on the bending failure pattern of prestressed concrete beams, but it reduces prestress loss and increases crack and yield loads.

Keywords

Installment tensioning technology / Prestressed concrete beam / Bearing capacity / Prestress loss

References

[1] Jun Xie, Guoliang Wang, Xiaohua Zheng. State-of-art of long-term deflection for long-span prestressed concrete box-girder bridge. J Highw Transp Res Dev, 2007, 24(1): 47-50 (in Chinese)

[2] Cuiyun Liu, Chuanzhou Dong. Development trend and construction techniques of foreign PC continuous beam bridges. World Bridges, 2011, 6: 36-39 (in Chinese)

[3] Zhi Fang, Jian Wang. Vertical prestressing loss in the box girder of long-span PC continuous bridges. China Civil Eng J, 2006, 39(5): 78-84 (in Chinese)

[4] Xiedong Zhang, Hao Zhan, Hongbo Shu, et al. Research of closure construction techniques for long-span prestressed concrete continuous girder bridge. Bridge Constr, 2005, 2: 63-66 (in Chinese)

[5] Qing Jiang, Xianguo Ye, Yimin Zhang, et al. Experimental research on cracking resistance of prestressed high-strength reinforced concrete beams. J Build Struct, 2014, 35(12): 51-57 (in Chinese)

[6] Wei Xiong, Hongyan Ding. Research on the influence of pre-stress tensioning on creep of concrete beams at early ages. Build Struct, 2014, 44(14): 24-27 (in Chinese)

[7] Ministry of Housing and Urban-Rural Development of the People’s Republic of China (2012) GB/T 50152-2012 standard for test method of concrete structures. China Architecture & Building Press, Beijing (in Chinese)

[8] Zhi Fang, Jianqun Wang, Xin He, et al. Full-scale model test of loading behaviour of prestressed concrete simply supported box girders. China J Highw Transp, 2011, 24(6): 49-56 (in Chinese)

[9] Jiping Ge, Zhiqiang Wang, Dawen Peng, et al. Experimental research on the static performance of high-speed railway box girder model under repeated loading. J Wuhan Univ Technol (Transportation Science and Engineering), 2013, 37(4): 741-744 (in Chinese)