Stress redistribution of RC beams strengthened with prestressed hybrid carbon/glass (C/G) fiber cloth

Affiliation of Author(s):航空学院

Journal:Jiaotong Yunshu Gongcheng Xuebao

Abstract:Based on solid degraded shell element, the layered shell element model was adopted for reinforced concrete (RC) beam and hybrid carbon/glass (C/G) fiber cloth, the combined shell element model was used for longitudinal reinforcement, and the prestress effect of hybrid C/G fiber cloth was simulated. A kind of nonlinear layered shell combined element for RC beam strengthened with prestressed hybrid C/G fiber cloth was established. The nonlinear effects of cracking, yielding and crushing of RC beam were described by cracking mode, Ottosen yielding criterion and Hinton crushing criterion. The changing rule of deflection, the reduction rule of stiffness and the ultimate bearing capacity of strengthened beam were analyzed, and the stress redistribution of hybrid C/G fiber cloth was studied. Calculation result shows that the nonlinear layer shell combined element analysis method is reliable, the relative error between the calculated value of characteristic load of strengthened beam and its experimental value is not more than 10%, and the nonlinear layered shell combined element has good convergence and numerical stability. Before the strengthened beam reaches cracking load, the stress redistribution coefficient of hybrid C/G fiber cloth changes little and is equal to 1.3 at cracking load. Then it increases gradually, is equal to 4.1 at yielding load and is equal to 14.8 at ultimate loads. When the beam is strengthened with common hybrid C/G fiber cloth, the high-strength property of fiber cloth cannot be fully used, and the utility degree is about 83%. When the beam is strengthened with prestressed hybrid C/G fiber cloth, the structural system of beam be improved, the high-strength property of fiber cloth can be well used, and the utility degree exceeds to 90%. © 2017, Editorial Department of Journal of Traffic and Transportation Engineering. All right reserved.

ISSN No.:1671-1637

Translation or Not:no

Date of Publication:2017-02-01

Co-author:Ye, Jian-Shu,Wang, Jing-Quan,Caijun Xue,Gao, Qi

Correspondence Author:zj

Date of Publication:2017-02-01