Experimental Study on Strengthening Hollow Concrete Bridge Piers With Prestressed Wire Ropes
In order to reinforce the vertical cracks in bridge piers,suppress crack propagation,and prevent the new cracks,four experiments of strengthening hollow concrete bridge piers were conducted by circular prestressed wire-ropes to investigate the distribution law of the wire-ropes tension,the concrete radial pressure,and the circumfer-ential strain on the concrete surface.The experimental results indicate that the tension in the wire ropes and the cor-responding concrete radial pressure are the maximum at the tensioning end and gradually decrease as they move away from the tensioning end due to the pre-tension loss caused by the frictional resistance between the wire-ropes and the concrete pier surface;The circumferential strain on the concrete surface decreases along the circumference as it moves away from the tensioning end and decreases vertically as it moves away from the wire-ropes.Based on the experimental results,a friction coefficient of 0.18 and a corresponding maximum pre-tension loss of 43％were calculated.A corresponding finite element model was established.The finite element calculation results aligned well with the experimental results.An effective reinforcement region,where the circumferential strain exceeding 50x10-6,is defined.Under the arrangement of multiple wire-ropes,a relatively large effective reinforcement area can be es-tablished,thus the reinforcement efficacy of prestressed wire-ropes will be verified.
万方数据
维普
