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Analysis of Bond Behavior of Steel Bar-to-concrete Interface After Exposure to Elevated Temperatures(PDF)

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

Issue:
2020年06期
Page:
91-99
Research Field:
Publishing date:

Info

Title:
Analysis of Bond Behavior of Steel Bar-to-concrete Interface After Exposure to Elevated Temperatures
Author(s):
ZHOU Mo-wei1;  GAO Wan-yang1; 2;  HU Ke-xu3
1. School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 3. Department of Disaster Mitigation for Structures, Tongji University, Shanghai 200092, China
Keywords:
RC structure;  bond behavior;  analytical model;  after exposure to elevated temperatures;  interface
PACS:
TU375
DOI:
-
Abstract:
Based on the thick-walled cylinder model with uniform pressure at inner surface, the damaged concrete cover around the deformed bar was divided into two parts according to the stress state, including a partially cracked inner part and an uncracked outer one. For the inner cylinder, the smeared cracking assumption and tension softening behavior of the cracked concrete was taken into account with the stiffness reduction along the radial direction. Also, the reductions in the elastic modulus, tensile strength and fracture energy of concrete after exposure to elevated temperatures were properly considered. Based on the theoretical analysis of the ultimate splitting failure between steel bar and concrete damaged by high temperatures, the calculation method and analytical model of the interfacial bond strength between steel bar and concrete after exposure to high temperatures was deduced, which was related to the size and material properties of steel bar and concrete. Moreover, a linear relationship between the radius of the inner cracked cylinder and the end slip of the reinforcing steel bar was proposed, and thus the interfacial bond stress-slip relationship was obtained. The accuracy of the analytical model was validated by comprising the predicted results with available pull out test data on the steel bar-to-concrete interface(including 118 bond strength data and 15 bond stress-end slip curves). The results show that the analytical model has good accuracy, and can be widely used for the analysis and prediction of interfacial bond strength after high temperature in drawing test with different parameters.

References:

[1] 吴 波,唐贵和.近年来混凝土结构抗火研究进展[J].建筑结构学报,2010,31(6):110-121. WU Bo,TANG Gui-he.State-of-the-art of Fire-resistance Study on Concrete Structures in Recent Years[J].Journal of Building Structures,2010,31(6):110-121.
[2]HADDAD R H,AL-SALEH R J,AL-AKHRAS N M.Effect of Elevated Temperature on Bond Between Steel Reinforcement and Fiber Reinforced Concrete[J].Fire Safety Journal,2008,43(5):334-343.
[3]MORLEY P D,ROYLES R.Response of the Bond in Reinforced Concrete to High Temperatures[J].Magazine of Concrete Research,1983,35(123):67-74.
[4]HLAVICKA E L V.Bond After Fire[J].Construction and Building Materials,2017,132:210-218.
[5]LU J,LIU H B,CHEN Z H,et al.Experimental Investigation Into the Post-fire Mechanical Properties of Hot-rolled and Cold-formed Steels[J].Journal of Constructional Steel Research,2016,121:291-310.
[6]YANG H F,LAN W W,QIN Y H,et al.Evaluation of Bond Performance Between Deformed Bars and Recycled Aggregate Concrete After High Temperatures Exposure[J].Construction and Building Materials,2016,112:885-891.
[7]BINGOL A F,GUL R.Residual Bond Strength Between Steel Bars and Concrete After Elevated Temperatures[J].Fire Safety Journal,2009,44(6):854-859.
[8]TEPFERS R.Cracking of Concrete Cover Along Anchored Deformed Reinforcing Bars[J].Magazine of Concrete Research,1979,31(106):3-12.
[9]王小惠.锈蚀钢筋混凝土梁的承载能力[D].上海:上海交通大学,2004. WANG Xiao-hui.Load Carrying Capacity of Corroded Reinforced Concrete Beams[D].Shanghai:Shanghai Jiao Tong University, 2004.
[10]徐秉业,王建学.弹性力学[M].北京:清华大学出版社,2007. XU Bing-ye,WANG Jian-xue.Elasticity[M].Beijing:Tsinghua University Press,2007.
[11]CEB-FIP Model Code 1990,Design Code[S].
[12]BARZEGAR-JAMSHIDI F,SCHNOBRICH W C.Nonlinear Finite Element Analysis of Reinforced Concrete Under Short Term Monotonic Loading[R].Urbana:University of Illinois at Urbana-champaign,1986.
[13]BAZANT Z P,OH B H.Crack Band Theory for Fracture of Concrete[J].Materials and Structures,1983,16(3):155-177.
[14]PANTAZOPOULOU S J,PAPOULIA K D.Modeling Cover-cracking Due to Reinforcement Corrosion in RC Structures[J].Journal of Engineering Mechanics,2001,127(4):342-351.
[15]BAZANT Z P,CHERN J C.Stress-induced Thermal and Shrinkage Strains in Concrete[J].Journal of Engineering Mechanics,1987,113(10):1493-1511.
[16]HILSDORF H K,BRAMESHUBER W.Code-type Formulation of Fracture Mechanics Concepts for Concrete[J].International Journal of Fracture,1991,51(1):61-72.
[17]ZHANG B,BICANIC N.Fracture Energy of High-performance Concrete at High Temperatures Up to 450 ℃:The Effects of Heating Temperatures and Testing Conditions(Hot and Cold)[J].Magazine of Concrete Research,2006,58(5):277-288.
[18]ZHANG B,BICANIC N,PEARCE C J,et al.Residual Fracture Properties of Normal-and High-strength Concrete Subject to Elevated Temperatures[J].Magazine of Concrete Research,2000,52(2):123-135.
[19]BAKER G.The Effect of Exposure to Elevated Temperatures on the Fracture Energy of Plain Concrete[J].Materials and Structures,1996,29(6):383-388.
[20]NIELSEN C V,BIEANIC N.Residual Fracture Energy of High-performance and Normal Concrete Subject to High Temperatures[J].Materials and Structures,2003,36(8):515-521.
[21]TANG W C,LO T Y.Mechanical and Fracture Properties of Normal-and High-strength Concretes with Fly Ash After Exposure to High Temperatures[J].Magazine of Concrete Research,2009,61(5):323-330.
[22]YU K Q,YU J T,LU Z D.Average Fracture Energy for Crack Propagation in Postfire Concrete[J].Advances in Materials Science and Engineering,2013,2013:143208.
[23]GAO W Y,DAI J G,TENG J G,et al.Finite Element Modeling of Reinforced Concrete Beams Exposed to Fire[J].Engineering Structures,2013,52:488-501.
[24]KHALAF J,HUANG Z H,FAN M Z.Analysis of Bond-slip Between Concrete and Steel Bar in Fire[J].Computers & Structures,2016,162:1-15.
[25]POTHISIRI T,PANEDPOJAMAN P.Modeling of Mechanical Bond-slip for Steel-reinforced Concrete Under Thermal Loads[J].Engineering Structures,2013,48:497-507.

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