scholarly journals Uniaxial Compressive Test of High Ductile Fiber-Reinforced Concrete and Damage Constitutive Model

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Mingke Deng ◽  
Jiaojiao Pan ◽  
Xingwen Liang
Keyword(s):  
Reinforced Concrete ◽  
Constitutive Model ◽  
Damage Model ◽  
Engineering Application ◽  
Strain Curve ◽  
Damage Threshold ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Uniaxial Compressive Test ◽  
Damage Constitutive Model

It has been widely recognized that the constitutive model plays an essential role in engineering application of high ductile fiber-reinforced concrete (HDC). In this research, uniaxial compressive tests were conducted on nine groups of HDC specimens with different mixture ratios and one group of mortar matrix specimens as comparison, discussing the effect of fiber content, water-cement ratio, fly ash content, and sand-binder ratio. According to the characteristics of stress-strain curve of HDC under uniaxial compression, a damage constitutive model was proposed by introducing two damage threshold parameters and then was compared with other existing models. Results indicated that the damage model curves suggested in this paper were best consistent with experimental curves and substantially demonstrate the damage evolution process as well as the cracking resistance effect of fiber bridging stress.

Research on Compressive Stress - Strain Relationship of Fiber Reinforced Concrete

2010 ◽  
Vol 168-170 ◽  
pp. 384-392 ◽  
Author(s):  
Tie Cheng Wang ◽  
Hai Long Zhao ◽  
Jin Jin Hao ◽  
Jian Quan Zu
Keyword(s):  
Reinforced Concrete ◽  
Constitutive Model ◽  
Engineering Application ◽  
Fiber Reinforced Concrete ◽  
Constitutive Relationship ◽  
Peak Strain ◽  
Test Results ◽  
Fiber Reinforced ◽  
Damage Constitutive Model ◽  
Relationship Of

The marked brittleness of concrete could be overcome by the addition of fibers. This paper experimentally investigated the mechanical properties and constitutive relationship of different fiber reinforced concrete. It is shown from the results that the compressive strength and peak strain of concrete with fiber have little improvement, but the ultimate strain, deformation capacity, toughness and energy dissipation capacity are improved greatly. The damage constitutive model recommended by the emendatory code for design of concrete structure (appendix C) (GB50010-2002) is applied for calculations and analyses according to the test results. The damage constitutive model and non-elastic constitutive model of different fiber reinforced concrete are established based on the test results. It is indicated from the analyses that the constitutive models established in this paper are in accordance with the characteristic of the fiber reinforced concrete in loading process. The damage constitutive model in appendix C in code could be applied directly in some low precision calculation and engineering application.

scholarly journals The Statistical Damage Constitutive Model of the Mechanical Properties of Alkali-Resistant Glass Fiber Reinforced Concrete

Symmetry ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1139
Author(s):  
Xianzeng Shi ◽  
Cong Zhang ◽  
Xingde Zhou
Keyword(s):  
Reinforced Concrete ◽  
Constitutive Model ◽  
Strain Curve ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Statistical Parameters ◽  
Glass Fiber Reinforced ◽  
Damage Constitutive Model ◽  
Statistical Damage Constitutive Model ◽  
Statistical Damage

Alkali-resistant glass fiber reinforced concrete (AR-GFRC) has greatly improved in terms of tensile strength, toughness, durability, and reduction of cracking, which has been proven by testing. However, the constitutive relationship of fiber reinforced concrete under complicated stress represents a complex theoretical problem. In order to investigate the microscopic damage evolution and failure mechanism of AR-GFRC, the meso-statistical damage theory, microcontinuum theory, and composite material theory were considered, and uniaxial tensile tests of two types of AR-GFRC were conducted. A new damage variable expression of the AR-GFRC was proposed, and the stress-strain curve was redefined by considering the residual strength based on experimental fitting parameters and statistical parameters. A Weibull distribution was assumed and a statistical damage constitutive model was developed of the deformation process of the AR-GFRC while considering the residual strength effect; detailed calculation methods to determine the mechanical and statistical parameters of the concrete were developed. The validation results show that the theoretical stress-strain curve of the constitutive model is in good agreement with the experimental curve and the trend is consistent.

scholarly journals Dynamic Constitutive Model Analysis of High Parameter Steel Fiber Reinforced Concrete

Symmetry ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 377 ◽  
Author(s):  
Dong Luo
Keyword(s):  
Reinforced Concrete ◽  
Constitutive Model ◽  
Steel Fiber ◽  
Strain Curve ◽  
State Equation ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Strain Rate Effects ◽  
Damage Evolution Equation

The traditional Holmquist-Johnson-Cook (HJC) constitutive model does not consider the effect of crack resistance, reinforcement and toughening effect of high parameter steel fiber on original concrete. The causes of the analysis effect of the high parameter reinforced concrete is not obvious. To address this problem, a dynamic constitutive model of high parameter steel fiber reinforced concrete is built in this paper. Based on the static constitutive model built by static force, a dynamic constitutive model is built based on the similarity between static and dynamic stress-strain curve. On this basis, the yield surface equation, state equation, and damage evolution equation of HJC constitutive model are constructed. An improved HJC constitutive model for high parameter steel fiber reinforced concrete is obtained by introducing the modification of the steel fiber reinforced, toughened, and strain rate effects into the HJC constitutive model. Dynamic analysis of high parameter steel fiber reinforced concrete is achieved by using the improved model. Experimental results show that the proposed model is effective in analyzing high parameter concrete and has strong applicability.

Constitutive Model Based on Damage Mechanics of Fiber Reinforced Concrete (FRC): A Review

2012 ◽  
Vol 238 ◽  
pp. 37-40
Author(s):  
Duo Xin Zhang ◽  
Qing Yun Wang
Keyword(s):  
Reinforced Concrete ◽  
Constitutive Model ◽  
Constitutive Modeling ◽  
Damage Mechanics ◽  
Damage Model ◽  
Constitutive Models ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Model Based ◽  
Historical Developments

In order to study the constitutive model of fiber reinforced concrete (FRC) for future, this paper emphasizes on three aspects. FRCs constitutive model based on damage mechanics has been reviewed. The knowledge and development of constitutive models is discussed based on its historical developments and logical relations. Damage model of FRCs which has been developed in recent years is summarized at macro and micro levels. The development trends of constitutive modeling for FRCs are suggested on the basis of our understanding of essential physical properties of FRC, e.g. its nonlinearity

scholarly journals Numerical analysis of steel-fiber-reinforced concrete beams using damage mechanics

2016 ◽  
Vol 9 (2) ◽  
pp. 153-191
Author(s):  
W. M. Pereira Junior ◽  
D. L. Araújo ◽  
J. J. C. Pituba
Keyword(s):  
Reinforced Concrete ◽  
Mechanical Behavior ◽  
Damage Mechanics ◽  
Steel Fiber ◽  
Concrete Beams ◽  
Damage Model ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete

ABSTRACT This work deals with numerical modeling of the mechanical behavior of steel-fiber-reinforced concrete beams using a constitutive model based on damage mechanics. Initially, the formulation of the damage model is presented. The concrete is assumed to be an initial elastic isotropic medium presenting anisotropy, permanent strains, and bimodularity induced by damage evolution. In order to take into account the contribution of the steel fiber to the mechanical behavior of the media, a homogenization procedure is employed. Finally, numerical analyses of steel-fiber-reinforced concrete beams submitted to bending loading are performed in order to show the good performance of the model and its potential.

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