Shear behavior of ultra-high-performance concrete beams prestressed with external carbon fiber-reinforced polymer tendons  

作　　者：Li JIA Zhi FANG Maurizio GUADAGNINI Kypros PILAKOUTAS Zhengmeng HUANG 

机构地区：[1]College of Civil Engineering,Hunan University,Changsha 410082,China [2]Key Laboratory for Wind and Bridge Engineering of Hunan Province,Changsha 410082,China [3]Department of Civil and Structural Engineering,The University of Sheffield,Sheffield S13JD,UK [4]Guizhou Transportation Planning Survey and Design Academe Co.Ltd.,Guiyang 550003,China

出　　处：《Frontiers of Structural and Civil Engineering》2021年第6期1426-1440,共15页结构与土木工程前沿（英文版）

基　　金：The authors sincerely appreciate the funding support from the National Natural Science Foundation of China(Grant No.51938012).The authors would sincerely acknowledge Miss Wei Zhang and Dr.Wang Qiwu for their language editing and insightful comments.

摘　　要：The ultra-high-performance concrete(UHPC)and fiber-reinforced polymer(FRP)are well-accepted high-performance materials in the field of civil engineering.The combination of these advanced materials could contribute to improvement of structural performance and corrosion resistance.Unfortunately,only limited studies are available for shear behavior of UHPC beams reinforced with FRP bars,and few suggestions exist for prediction methods for shear capacity.This paper presents an experimental investigation on the shear behavior of UHPC beams reinforced with glass FRP(GFRP)and prestressed with external carbon FRP(CFRP)tendons.The failure mode of all specimens with various shear span to depth ratios from 1.7 to 4.5 was diagonal tension failure.The shear span to depth ratio had a significant influence on the shear capacity,and the effective prestressing stress affected the crack propagation.The experimental results were then applied to evaluate the equations given in different codes/recommendations for FRPreinforced concrete structures or UHPC structures.The comparison results indicate that NF P 18-710 and JSCE CES82 could appropriately estimate shear capacity of the slender specimens with a shear span to depth ratio of 4.5.Further,a new shear design equation was proposed to take into account the effect of the shear span to depth ratio and the steel fiber content on shear capacity.

关 键 词：BEAM external prestressing ultra-high-performance concrete fiber-reinforced polymers shear behavior design equation 

分 类 号：TU528[建筑科学—建筑技术科学]