«上一篇/Previous Article|本期目录/Table of Contents|下一篇/Next Article»

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

卷:

36卷

期数:

2019年04期

页码:

55-62

栏目:

出版日期:

2019-07-25

文章信息/Info

Title:

Experiment on Fatigue Flexural Behaviors of Hybrid Reinforced Concrete Beams

文章编号:

1673-2049(2019)04-0055-08

作者:

朱 鹏,许家婧,屈文俊

(同济大学 土木工程学院,上海 200092)

Author(s):

ZHU Peng, XU Jia-jing, QU Wen-jun

(College of Civil Engineering, Tongji University, Shanghai 200092, China)

关键词:

混合配筋混凝土梁;  FRP筋;  疲劳试验;  抗弯刚度

Keywords:

hybrid reinforced concrete beam;  FRP bar;  fatigue test;  flexural stiffness

分类号:

TU375.1

DOI:

-

文献标志码:

A

摘要:

为了研究混合配筋(混合配置FRP筋和钢筋)混凝土梁的抗弯疲劳性能,设计了4根混合配筋混凝土梁(1根梁承受静力荷载,3根梁承受等幅疲劳荷载),进行了疲劳试验。结果表明:混合配筋混凝土梁抗弯疲劳破坏始于受拉钢筋的疲劳断裂,GFRP筋断裂或者基体开裂剥落,随后压区顶部混凝土压碎; 破坏时纯弯段出现1条或2条主裂缝,钢筋疲劳断口光滑,未出现静力拉断时的屈服和颈缩现象; GFRP筋疲劳破坏未出现静力受拉破坏时纤维“扫帚”型破坏模式; 疲劳加载后构件产生不可恢复的残余挠度,残余挠度随着疲劳次数和疲劳上限荷载的增加而增大; 疲劳过程中纯弯段基本不出现新裂缝,均是沿已有初始裂缝扩展; 基于有效惯性矩法的刚度计算值和基于刚度解析法的刚度计算值均大于试验值,偏于不安全; 基于EN 1992-1-1:2004提出的刚度预测模型相对偏差均在10%以内,且刚度计算值小于试验值,偏于安全。

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.

参考文献/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].

相似文献/References:

[1]屈文俊,刘传名,朱 鹏.加筋混凝土梁延性系数计算方法[J].建筑科学与工程学报,2019,36(06):10.
　QU Wen-jun,LIU Chuan-ming,ZHU Peng.Calculation Method for Ductility Coefficient of Reinforced Concrete Beams[J].Journal of Architecture and Civil Engineering,2019,36(04):10.

备注/Memo

备注/Memo:

收稿日期:2018-12-10
基金项目:国家重点研发计划专项项目(2017YFC0703000); 国家自然科学基金项目(51678430)
作者简介:朱 鹏(1981-),男,河南新乡人,讲师,工学博士,E-mail:pzhu@tongji.edu.cn。

常用功能

更新日期/Last Update: 2019-07-26