A precise solution for prediction of fiber-reinforced concrete behavior under flexure  

作　　者：R.AHMADI P.GHODDOUSI M.SHARIFI V.Mojarrad BAHREH 

机构地区：[1]Building and House Research Center,Tehran 13145-1996,Iran [2]Department of Civil Engineering,Iran University of Science and Technology,Tehran 16846-13114,Iran [3]Department of Civil Engineering,Sharif University of Technology,Tehran 11365-11155,Iran

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2011年第7期495-502,共8页浙江大学学报（英文版）A辑（应用物理与工程）

摘　　要：This paper presents a precise solution to predict the behavior of steel fiber reinforced concrete(SFRC) under the four point bending test(FPBT).All the force components at the beam section(before and after cracking) are formulated by applying these assumptions:a realistic stress-strain model is used for concrete behavior in compression,a linear response is considered for the uncracked tension region in a concrete constitutive model,and an exponential relationship is proposed as a stress-crack opening in the crack region which requires two parameters.Then the moment capacity of the critical cracked section is calculated by using these forces and satisfying equilibrium law at the section.Parametric studies are done on the behavior of SFRC to assess the sensitivity of the solution.Finally,this solution is validated with some existing experimental data.The result shows the proposed solution is able to estimate the behavior of SFRC under FPBT.This paper presents a precise solution to predict the behavior of steel fiber reinforced concrete （SFRC） under the four point bending test （FPBT）. All the force components at the beam section （before and after cracking） are formulated by applying these assumptions： a realistic stress-strain model is used for concrete behavior in compression, a linear response is considered for the uncracked tension region in a concrete constitutive model, and an exponential relationship is proposed as a stress-crack opening in the crack region which requires two parameters. Then the moment capacity of the critical cracked section is calculated by using these forces and satisfying equilibrium law at the section. Parametric studies are done on the behavior of SFRC to assess the sensitivity of the solution. Finally, this solution is validated with some existing experimental data. The result shows the pro- posed solution is able to estimate the behavior of SFRC under FPBT.

关 键 词：Steel fiber reinforced concrete(SFRC) Flexure Stress-crack opening Four point bending test(FPBT) 

分 类 号：TU528[建筑科学—建筑技术科学]