Numerical assessment of continuous prestressed NSC and HSC members with external CFRP tendons

被引：7

作者：

Lou, Tiejiong ^{[1
,2
]}

Min, Di ^{[1
]}

Sun, Wei ^{[2
]}

Chen, Bo ^{[1
]}

机构：

[1] Wuhan Univ Technol, Key Lab Roadway Bridge & Struct Engn, Wuhan 430070, Hubei, Peoples R China

[2] Univ Southampton, Fac Engn & Phys Sci, Southampton SO17 1BJ, Hants, England

来源：

COMPOSITE STRUCTURES | 2020年 / 234卷

基金：

欧盟地平线“2020”;

关键词：

CFRP tendons; High-strength concrete; Continuous member; Structural response; CONCRETE BEAMS; MOMENT REDISTRIBUTION; FLEXURAL DUCTILITY; ANCHORAGE SYSTEM; BEHAVIOR; PERFORMANCE; PREDICTION;

D O I：

10.1016/j.compstruct.2019.111671

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Carbon fiber reinforced polymer (CFRP) is a promising material for prestressing tendons. This study assesses the structural performance of continuous prestressed members with external CFRP tendons, focusing on the effect of using high-strength concrete (HSC) instead of normal-strength concrete (NSC). A nonlinear model is introduced and numerical tests are then carried out. Three concrete cylinder compressive strengths of 40, 60 and 90 MPa are used. The area of external CFRP tendons varies from 200 to 1700 mm(2). The results show that the effect of using HSC instead of NSC heavily depends on the area of external CFRP tendons. In general, HSC members with external CFRP tendons exhibits considerably different response characteristics from those of NSC ones, including cracking, deformations, tendon and rebar stresses, neutral axis depths and so on. The concrete grade influence on moment redistribution is found to be negligible, provided that the members demonstrate favorable ductility. The rules in ACI 318-14 concerning the unbonded tendon stress and the redistribution of moments are evaluated.

引用

页数：15

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