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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Computers and Concrete
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Volume & Issues
Volume 1, Issue 4 - Nov 2004
Volume 1, Issue 3 - Aug 2004
Volume 1, Issue 2 - May 2004
Volume 1, Issue 1 - Feb 2004
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Tools for forensic analysis of concrete structures
Vecchios, Frank J. ; Bentz, Evan C. ; Collins, Michael P. ;
Computers and Concrete, volume 1, issue 1, 2004, Pages 1~14
DOI : 10.12989/cac.2004.1.1.001
Computer-based analysis tools for forensic assessment of reinforced concrete structures are presented. The analysis tools, mostly in the form of nonlinear finite element procedures, are based on the concepts and formulations of the Modified Compression Field Theory. Relevant details regarding their formulation are provided. Development of realistic constitutive models and corroboration of the analysis procedures, through comprehensive experimental programs, are discussed. Also presented are graphics-based pre- and post-processors, which are of significant aid in structural modeling, input of data, and interpretation of analysis results. The details and results of a case study, illustrating the application and value of such analytical tools, are also discussed.
Computer aided reinforcement design of RC structures
An, Xuehui ; Maekawa, Koichi ;
Computers and Concrete, volume 1, issue 1, 2004, Pages 15~30
DOI : 10.12989/cac.2004.1.1.015
In this study, a design process for reinforced concrete structures using the nonlinear FEM analysis is developed. Instead of using the nonlinear analysis to evaluate the required performance after design process, the nonlinear analysis is applied before designing the reinforcement arrangement inside the RC structures. An automatic reinforcement generator for computer aided reinforcement agreement is developed for this purpose. Based on a nonlinear FEM program for analyzing the reinforced concrete structure, a smart fictitious material model of steel, is proposed which can self-adjust the reinforcement to the required amount at the cracking location according to the load increment. Using this tool, the reinforcement ratio required at design load level can be decided automatically. In this paper, an example of RC beam with opening is used to verify the proposed process. Finally, a trial design process for a real size underground RC LNG tank is introduced.
Numeric simulation of near-surface moisture migration and stress development in concrete exposed to fire
Consolazio, Gary R. ; Chung, Jae H. ;
Computers and Concrete, volume 1, issue 1, 2004, Pages 31~46
DOI : 10.12989/cac.2004.1.1.031
A methodology is presented for computing stresses in structural concrete members exposed to fire. Coupled heat and moisture migration simulations are used to establish temperature, pore pressure, and liquid-saturation state variables within near-surface zones of heated concrete members. Particular attention is placed on the use of coupled heat and multiphase fluid flow simulations to study phenomena such as moisture-clogging. Once the state variables are determined, a procedure for combining the effects of thermal dilation, mechanical loads, pore pressure, and boundary conditions is proposed and demonstrated. Combined stresses are computed for varying displacement boundary conditions using data obtained from coupled heat and moisture flow simulations. These stresses are then compared to stresses computed from thermal analyses in which moisture effects are omitted. The results demonstrate that moisture migration has a significant influence on the development of thermal stresses.
An analytical and computational study on energy dissipation along fracture process zone in concrete
Zhao, Yanhua ; Xu, Shilang ; Li, Zongjin ;
Computers and Concrete, volume 1, issue 1, 2004, Pages 47~60
DOI : 10.12989/cac.2004.1.1.047
The influence of the fracture process zone (FPZ) on the fracture properties is one of the hottest topics in the field of fracture mechanics for cementitious materials. Within the FPZ in front of a traction free crack, cohesive forces are distributed in accordance with the softening stress-separation constitutive relation of the material. Therefore, further crack propagation necessitates energy dissipation, which is the work done by the cohesive forces. In this paper
, the local fracture energy characterizing the energy consumption due to the cohesive forces, is discussed. The computational expression of
in the FPZ can be obtained for any stage during the material fracture process regarding the variation of FPZ, whether in terms of its length or width.
, the average energy consumption along the crack extension region, has also been computed and discussed in this paper. The experimental results obtained from the wedge splitting tests on specimens with different initial notch ratios are employed to investigate the property of the local fracture energy
and the average value
over the crack extension length. These results can be used to indicate the influence of the FPZ. Additionally, changes in the length of the FPZ during the fracture process are also studied.
Computational modeling of cracking of concrete in strong discontinuity settings
Oliver, J. ; Huespe, A. ; Pulido, M.D.G. ; Blanco, S. ;
Computers and Concrete, volume 1, issue 1, 2004, Pages 61~76
DOI : 10.12989/cac.2004.1.1.061
The paper is devoted to present the Continuum Strong Discontinuity Approach (CSDA) and to examine its capabilities for modeling cracking of concrete. After introducing the main ingredients of the CSDA, an isotropic continuum damage model, which distinguishes tension and compression states, is used to implicitly induce a projected traction separation-law that rules the cracking phenomena. Criteria for onset and propagation of material failure and specific finite elements with embedded discontinuities are also briefly sketched. Finally, some representative numerical simulations of cracking, in plain and reinforced concrete specimens, using the CSDA are presented.
Cracking behavior of RC shear walls subject to cyclic loadings
Kwak, Hyo-Gyoung ; Kim, Do-Yeon ;
Computers and Concrete, volume 1, issue 1, 2004, Pages 77~98
DOI : 10.12989/cac.2004.1.1.077
This paper presents a numerical model for simulating the nonlinear response of reinforced concrete (RC) shear walls subject to cyclic loadings. The material behavior of cracked concrete is described by an orthotropic constitutive relation with tension-stiffening and compression softening effects defining equivalent uniaxial stress-strain relation in the axes of orthotropy. Especially in making analytical predictions for inelastic behaviors of RC walls under reversed cyclic loading, some influencing factors inducing the material nonlinearities have been considered. A simple hysteretic stress-strain relation of concrete, which crosses the tension-compression region, is defined. Modification of the hysteretic stress-strain relation of steel is also introduced to reflect a pinching effect depending on the shear span ratio and to represent an average stress distribution in a cracked RC element, respectively. To assess the applicability of the constitutive model for RC element, analytical results are compared with idealized shear panel and shear wall test results under monotonic and cyclic shear loadings.
Performance of structural-concrete members under sequential loading and exhibiting points of inflection
Jelic, I. ; Pavlovic, M.N. ; Kotsovos, M.D. ;
Computers and Concrete, volume 1, issue 1, 2004, Pages 99~113
DOI : 10.12989/cac.2004.1.1.099
The article reports data on, and numerical modelling of, beams exhibiting points of inflection and subjected to sequential loading. Both tests and analysis point to inadequacies in current codes of practice. An alternative design methodology, which is strongly associated with the notion that contraflexure points should be designed as "internal supports", is shown to produce superior performance even though it requires significantly less secondary reinforcement than that advocated by codes.