A novel micromechanical model of residual fracture energy of hooked-end steel fiber reinforced concrete exposed to high temperature

被引:25
作者
Zhang, Yao [1 ,2 ,3 ,4 ]
Ju, J. Woody [3 ,4 ]
Xu, Fei [1 ,2 ]
Yan, Zhiguo [3 ]
Zhu, Hehua [3 ]
机构
[1] Shijiazhuang Tiedao Univ, Struct Hlth Monitoring & Control Key Lab Hebei Pr, Shijiazhuang 050043, Hebei, Peoples R China
[2] Shijiazhuang Tiedao Univ, State Key Lab Mech Behav & Syst Safety Traff Engn, Shijiazhuang 050043, Hebei, Peoples R China
[3] Tongji Univ, Dept Geotech Engn, 1239 Siping Rd, Shanghai 200092, Peoples R China
[4] Univ Calif Los Angeles, Dept Civil & Environm Engn, Los Angeles, CA 90095 USA
基金
中国国家自然科学基金;
关键词
Residual fracture energy; Micromechanical model; Hooked-end steel fiber reinforced concrete; High temperature; Fire resistance; PULL-OUT BEHAVIOR; REACTIVE POWDER CONCRETE; CEMENTITIOUS COMPOSITE; MECHANICAL-PROPERTIES; ELASTIC PROPERTIES; SHEAR-STRENGTH; FRAMEWORK; STRAIGHT; CRACKING; CHINA;
D O I
10.1016/j.conbuildmat.2020.122211
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
It remains challenging to quantitatively describe the relationship between the incorporation of fibers and the residual fracture energy of hooked-end steel fiber reinforced concrete (HSFRC) exposed to high temperature. The residual fracture energy contributed by the hooked-end steel fiber is classified into two types: (i) the energy consumed by frictions including the fiber sliding friction, the Coulomb friction at the hook corner, and the friction induced by the fractured matrix; (ii) the deformation energy by straightening the hooked ends. Based on the pullout energy of the single fiber, we develop a micromechanical model to predict the residual fracture energy of HSFRC considering the thermal deterioration of the cementitious matrix and the steel fiber exposed to temperature levels ranging from 20 degrees C to 800 degrees C. This novel micromechanical model, validated by previously published experimental data, is then utilized to study the effects of the fiber length, diameter, volume fraction, and the yielding tensile strength and the matrix type upon the residual fracture energy of HSFRC. Interestingly, we find that tuning the fiber length, diameter, and volume fraction can achieve more remarkable improvements in the fire resistance of HSFRC than regulating the initial yielding tensile strength of steel fibers and the matrix type. Our micromechanical model could, therefore, enable the computational optimal design of fire-resistant HSFRC. (C) 2020 Published by Elsevier Ltd.
引用
收藏
页数:11
相关论文
共 58 条
[1]   Bonding Mechanisms and Strength of Steel Fiber-Reinforced Cementitious Composites: Overview [J].
Abdallah, Sadoon ;
Fan, Mizi ;
Rees, David W. A. .
JOURNAL OF MATERIALS IN CIVIL ENGINEERING, 2018, 30 (03)
[2]   Pull-out behaviour of straight and hooked-end steel fibres under elevated temperatures [J].
Abdallah, Sadoon ;
Fan, Mizi ;
Cashell, K. A. .
CEMENT AND CONCRETE RESEARCH, 2017, 95 :132-140
[3]   Bond-slip behaviour of steel fibres in concrete after exposure to elevated temperatures [J].
Abdallah, Sadoon ;
Fan, Mizi ;
Cashell, K. A. .
CONSTRUCTION AND BUILDING MATERIALS, 2017, 140 :542-551
[4]   Effect of elevated temperature on pull-out behaviour of 4DH/5DH hooked end steel fibres [J].
Abdallah, Sadoon ;
Fan, Mizi ;
Rees, David W. A. .
COMPOSITE STRUCTURES, 2017, 165 :180-191
[5]   Creep behavior of steel fiber reinforced reactive powder concrete at high temperature [J].
Abid, Muhammad ;
Hou, Xiaomeng ;
Zheng, Wenzhong ;
Hussain, Raja Rizwan ;
Cao, Shaojun ;
Lv, Zhihao .
CONSTRUCTION AND BUILDING MATERIALS, 2019, 205 :321-331
[6]  
Alwan J.M., 1999, CONCR SCI ENG, V29, P1027
[7]  
[Anonymous], 2005, EN14651 BS
[8]   Influence of high temperature on strength, ultrasonic velocity and mass loss of calcium carbonate whisker reinforced cement paste [J].
Cao, Mingli ;
Ming, Xing ;
Yin, Hong ;
Li, Li .
COMPOSITES PART B-ENGINEERING, 2019, 163 :438-446
[9]   Effect of inclination angle on hooked end steel fiber pullout behavior in ultra-high performance concrete [J].
Cao, Y. Y. Y. ;
Yu, Q. L. .
COMPOSITE STRUCTURES, 2018, 201 :151-160
[10]   Modeling the pullout of wire-drawn steel fibers [J].
Chanvillard, G .
CEMENT AND CONCRETE RESEARCH, 1999, 29 (07) :1027-1037