Abstract

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Title:: Experimental Study on Precast Hollow Slab Strengthened by High-strength Steel Wire Rope Suspension

Author(s):: WANG Zi-jun; ZHU Jian; WU Yun-shen; YANG Fang; FU Teng-fei; College of Civil Engineering, Nanjing Tech University

Keywords:: precast hollow slab; high-strength steel wire rope; strengthening; experimental study

Abstract:: A method to improve the bearing capacity of precast hollow slab by the combination of grouting core reinforcement and suspension reinforcement was presented. The grouting method of grouting reinforcement, the anchoring mode of suspension reinforcement, the influence of different quantity of steel wire rope on the reinforcement performance and the stress state of steel wire rope were mainly discussed. The static tests of 7 specimens under uniform load were carried out, including 2 contrast specimens, 2 grouting reinforcement specimens, and 3 steel wire rope suspension reinforcement specimens. The results show that steel wire rope suspension reinforcement can improve the ultimate bearing capacity of precast hollow slab by 45%-74%, and improve the ultimate displacement by 175%-195%. Considering the economical efficiency, construction work quantity, improvement degree of bearing capacity and the stress of prestressed reinforcement, the reinforcement effect of 4 steel wire ropes is best. The reinforcement effect is greater when the steel wire rope is closer to the middle. The reinforcement effect of the method presented is remarkable, which can be used as reference for the practical application of precast hollow slab reinforcement.