Research on Prestressed Loss in Curving Hole of Prestressed Concrete Structure Caused by Frictional Resistance

Abstract

Excessive prestressed loss in prestressed concrete continuous beam bridge and continuous rigid frame bridge causes structures appearing different types of diseases. By theoretical analysis on computational expression of effective prestress in curving hole, and distribution of contact stress and experiment about prestressed loss caused by frictional resistance, this paper points out the disadvantages of current effective prestress formula in curving hole. According to the research on the major influencing factors of prestressed loss in curving hole-contact status and friction coefficient μ, it plays a remarkable role on the further analysis of prestressed loss in curving hole.

Experimental Analysis on Pre-Stress Friction Loss of Crushed Limestone Sand Concrete Beams

“…CLS concrete with large elastic modulus is sensitive to the increase in concrete age, and the creep and shrinkage is more obvious than normal concrete [2]. When compared with long-term pre-stress loss [5][6][7][8], the instantaneous loss caused by friction also significantly affects the initial pre-stress force of the tendon [10][11][12][13][14][15]. The effective force inevitably decreases due to the friction loss between the pre-stressing tendon and duct [10].…”