|Table of Contents|

Experiment on Fatigue Flexural Behaviors of Hybrid Reinforced Concrete Beams(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年04期
Page:
55-62
Research Field:
Publishing date:

Info

Title:
Experiment on Fatigue Flexural Behaviors of Hybrid Reinforced Concrete Beams
Author(s):
ZHU Peng;  XU Jia-jing;  QU Wen-jun
(College of Civil Engineering, Tongji University, Shanghai 200092, China)
Keywords:
hybrid reinforced concrete beam;  FRP bar;  fatigue test;  flexural stiffness
PACS:
TU375.1
DOI:
-
Abstract:
In order to study the fatigue flexural behaviors of hybrid(combination of FRP bars and steel bars)reinforced concrete beam, four beams(one beam was subjected to static loading and three beams were subjected to fatigue loading)were designed, and the fatigue test was carried out. The results show that the fatigue failure of the specimen starts with fatigue fracture of one tension steel bar, followed by the broken or matrix stripping of GFRP bars, and ends with concrete crushing at the top. One or two major cracks occur when flexural fatigue failure occurs. The fatigue fracture surface of steel bars is smooth, and no yielding or necking occurs. The fatigue failure mode of GFRP bars is different with the broomlike failure mode in static tensile test. The irrecoverable residual deflection of component occurs after fatigue loading. The residual deflection increases with the upper limit of fatigue loading and fatigue cycles. Cracks propagate along the existing cracks, and no new crack occurs in the pure bending zone during fatigue process. The calculation values of flexural stiffness based on effective moment of inertia and the calculations values of flexural stiffness based on stiffness analytic method are both larger than the test results, which is unsafe. The relative deviation of proposed flexural stiffness based on EN 1992-1-1:2004 is less than 10%, and the calculation values of flexural stiffness are less than the test results and safer.

References:

[1] 庞 蕾.截面等耐久性混合配筋混凝土构件受力性能研究[D].上海:同济大学,2016.
PANG Lei. Investigation of Concrete Members Reinforced with Steel and FRP Bars for Sectional Equal Durability[D].Shanghai:Tongji University,2016.
[2]庞 蕾,屈文俊,李 昂.混合配筋混凝土梁抗弯计算理论[J].中国公路学报,2016,29(7):81-88.
PANG Lei,QU Wen-jun,LI Ang.Calculation of Flexural Strength for Concrete Beams Reinforced with Hybrid(FRP and Steel)Bars[J].China Journal of Highway and Transport,2016,29(7):81-88.
[3]AIELLO M A,OMBRES L.Structural Performances of Concrete Beams with Hybrid(Fiber-reinforced Polymer-steel)Reinforcements[J].Journal of Composites for Construction,2002,6(2):133-140.
[4]QU W J,ZHANG X L,HUANG H Q.Flexural Behavior of Concrete Beams Reinforced with Hybrid(GFRP and Steel)Bars[J].Journal of Composites for Construction,2009,13(5):350-359.
[5]LEUNG H Y,BALENDRAN R V.Flexural Behaviour of Concrete Beams Internally Reinforced with GFRP Rods and Steel Rebars[J].Structural Survey,2003,21(4):146-157.
[6]LAU D,PAM H J.Experimental Study of Hybrid FRP Reinforced Concrete Beams[J].Engineering Structures,2010,32(12):3857-3865.
[7]REFAI A E,ABED F,AL-RAHMANI A.Structural Performance and Serviceability of Concrete Beams Reinforced with Hybrid(GFRP and Steel)Bars[J].Construction and Building Materials,2015,96:518-529.
[8]PANG L,QU W J,ZHU P,et al.Design Propositions for Hybrid FRP-steel Reinforced Concrete Beams[J].Journal of Composites for Construction,2016,20(4):04015086.
[9]宋玉普.混凝土结构的疲劳性能及设计原理[M].北京:机械工业出版社,2006.
SONG Yu-pu.Fatigue Behavior and Design Principle of Concrete Structures[M].Beijing:China Machine Press,2006.
[10]查全璠,肖建庄.钢筋混凝土梁疲劳性能国内外研究综述[J].世界桥梁,2004(3):30-34.
ZHA Quan-fan,XIAO Jian-zhuang.An Overview of Domestic and Foreign Researches of Fatigue Behavior of Reinforced Concrete Beams[J].World Bridges,2004(3):30-34.
[11]CEB-FIP,Fib Model Code for Concrete Structures 2010[S].
[12]GB/T 228.1—2010,金属材料拉伸试验:第1部分:室温试验方法[S].
GB/T 228.1—2010,Metallic Materials — Tensile Testing — Part 1:Method of Test at Room Temperature[S].
[13]GB/T 30022—2013,纤维增强复合材料筋基本力学性能试验方法[S].
GB/T 30022—2013,Test Method for Basic Mechanical Properties of Fiber Reinforced Polymer Bar[S].
[14]ACI 215R-74-1992,Considerations for Design of Concrete Structures Subjected to Fatigue Loading[S].
[15]REED-HILL R E.Physical Metallurgy Principles[M].New Delhi:Affiliated East-west Press,2008.
[16]马达洛夫 N A.钢筋混凝土受弯构件在重复荷载下的性能研究[M].谢君斐,译.北京:科学出版社,1964.
MADALOV N A.Flexual Performance of Steel Reinforced Concrete Members Under Cyclic Load[M].Translated by XIE Jun-fei.Beijing:Science Press,1964.
[17]BALAGURU P N,SHAH S P.A Method of Predicting Crack Widths and Deflections for Fatigue Loading[J].ACI Special Publication,1982,75(5):153-175.
[18]BISCHOFF P H.Reevaluation of Deflection Prediction for Concrete Beams Reinforced with Steel and Fiber Reinforced Polymer Bars[J].Journal of Structural Engineering,2005,131(5):752-767.
[19]ZHU P,XU J J,QU W J,et al.Experimental Study of Fatigue Flexural Performance of Concrete Beams Reinforced with Hybrid GFRP and Steel Bars[J].Journal of Composites for Construction,2017,21(5):04017036.
[20]GB 50010—2010,混凝土结构设计规范[S].
GB 50010—2010,Code for Design of Concrete Structures[S].
[21]EN 1992-1-1:2004,Eurocode 2:Design of Concrete Structures.Part 1-1:General Rules and Rules for Buildings[S].

Memo

Memo:
-
Last Update: 2019-07-26