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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 7, Issue 6 - Dec 2010
Volume 7, Issue 5 - Oct 2010
Volume 7, Issue 4 - Aug 2010
Volume 7, Issue 3 - Jun 2010
Volume 7, Issue 2 - Apr 2010
Volume 7, Issue 1 - Feb 2010
Selecting the target year
The virtual penetration laboratory: new developments for projectile penetration in concrete
Adley, Mark D. ; Frank, Andreas O. ; Danielson, Kent T. ; Akers, Stephen A. ; O`Daniel, James L. ;
Computers and Concrete, volume 7, issue 2, 2010, Pages 87~102
DOI : 10.12989/cac.2010.7.2.087
This paper discusses new capabilities developed for the Virtual Penetration Laboratory (VPL) software package to address the challenges of determining Penetration Resistance (PR) equations for concrete materials. Specifically, the paper introduces a three-invariant concrete constitutive model recently developed by the authors. The Advanced Fundamental Concrete (AFC) model was developed to provide a fast-running predictive model to simulate the behavior of concrete and other high-strength geologic materials. The Continuous Evolutionary Algorithms (CEA) automatic fitting algorithms used to fit the new model are discussed, and then examples are presented to demonstrate the effectiveness of the new AFC model. Finally, the AFC model in conjunction with the VPL software package is used to develop a PR equation for a concrete material.
Comparing finite element and meshfree particle formulations for projectile penetration into fiber reinforced concrete
O`Daniel, James ; Adley, Mark ; Danielson, Kent ; DiPaolo, Beverly ; Boone, Nicholas ;
Computers and Concrete, volume 7, issue 2, 2010, Pages 103~118
DOI : 10.12989/cac.2010.7.2.103
Penetration of a fragment-like projectile into Fiber Reinforced Concrete (FRC) was simulated using finite element (FE) and particle formulations. Extreme deformations and failure of the material during the penetration event were modeled with multiple approaches to evaluate how well each represented the actual physics of the penetration process and compared to experimental data. A Fragment Simulating Projectile(FSP) normally impacting a flat, square plate of FRC was modeled using two target thicknesses to examine the different levels of damage. The thinner plate was perforated by the FSP, while the thicker plate captured the FSP and only allowed penetration part way through the thickness. Full three dimensional simulations were performed, so the capability was present for non-symmetric FRC behavior and possible projectile rotation in all directions. These calculations assessed the ability of the finite element and particle formulations to calculate penetration response while assessing criteria necessary to perform the computations. The numerical code EPIC contains the element and particle formulations, as well as the explicit methodology and constitutive models, needed to perform these simulations.
The use of RKPM meshfree methods to compute responses to projectile impacts and blasts nearby charges
Choi, Hyung-Jin ; Crawford, John ; Wu, Youcai ;
Computers and Concrete, volume 7, issue 2, 2010, Pages 119~143
DOI : 10.12989/cac.2010.7.2.119
This paper presents results from a study concerning the capability afforded by the RKPM (reproducing kernel particle method) meshfree analysis formulation to predict responses of concrete and UHPC components resulting from projectile impacts and blasts from nearby charges. In this paper, the basic features offered by the RKPM method are described, especially as they are implemented in the analysis code KC-FEMFRE, which was developed by Karagozian & Case (K&C).
Integration of the microplane constitutive model into the EPIC code
Littlefield, David ; Walls, Kenneth C. ; Danielson, Kent T. ;
Computers and Concrete, volume 7, issue 2, 2010, Pages 145~158
DOI : 10.12989/cac.2010.7.2.145
In this work the implementation of a production-level port of the Microplane constitutive model for concrete into the EPIC code is described. The port follows guidelines outlined in the Material Model Module (MMM) standard used in EPIC to insure a seamless interface with the existing code. Certain features of the model were not implemented using the MMM interface due to compatibility reasons; for example, a separate module was developed to initialize, store and update internal state variables. Objective strain and deformation measures for use in the material model were also implemented into the code. Example calculations were performed and illustrate the veracity of this new implementation.
Numerical procedures for extreme impulsive loading on high strength concrete structures
Danielson, Kent T. ; Adley, Mark D. ; O`Daniel, James L. ;
Computers and Concrete, volume 7, issue 2, 2010, Pages 159~167
DOI : 10.12989/cac.2010.7.2.159
This paper demonstrates numerical techniques for complex large-scale modeling with microplane constitutive theories for reinforced high strength concrete, which for these applications, is defined to be around the 7000 psi (48 MPa) strength as frequently found in protective structural design. Applications involve highly impulsive loads, such as an explosive detonation or impact-penetration event. These capabilities were implemented into the authors` finite element code, ParaAble and the PRONTO 3D code from Sandia National Laboratories. All materials are explicitly modeled with eight-noded hexahedral elements. The concrete is modeled with a microplane constitutive theory, the reinforcing steel is modeled with the Johnson-Cook model, and the high explosive material is modeled with a JWL equation of state and a programmed burn model. Damage evolution, which can be used for erosion of elements and/or for post-analysis examination of damage, is extracted from the microplane predictions and computed by a modified Holmquist-Johnson-Cook approach that relates damage to levels of inelastic strain increment and pressure. Computation is performed with MPI on parallel processors. Several practical analyses demonstrate that large-scale analyses of this type can be reasonably run on large parallel computing systems.
Flexural and tensile properties of a glass fiber-reinforced ultra-high-strength concrete: an experimental, micromechanical and numerical study
Roth, M. Jason ; Slawson, Thomas R. ; Flores, Omar G. ;
Computers and Concrete, volume 7, issue 2, 2010, Pages 169~190
DOI : 10.12989/cac.2010.7.2.169
The focus of this research effort was characterization of the flexural and tensile properties of a specific ultra-high-strength, fiber-reinforced concrete material. The material exhibited a mean unconfined compressive strength of approximately 140 MPa and was reinforced with short, randomly distributed alkali resistant glass fibers. As a part of the study, coupled experimental, analytical and numerical investigations were performed. Flexural and direct tension tests were first conducted to experimentally characterize material behavior. Following experimentation, a micromechanically-based analytical model was utilized to calculate the material`s tensile failure response, which was compared to the experimental results. Lastly, to investigate the relationship between the tensile failure and flexural response, a numerical analysis of the flexural experiments was performed utilizing the experimentally developed tensile failure function. Results of the experimental, analytical and numerical investigations are presented herein.
Constitutive property behavior of an ultra-high-performance concrete with and without steel fibers
Williams, E.M. ; Graham, S.S. ; Akers, S.A. ; Reed, P.A. ; Rushing, T.S. ;
Computers and Concrete, volume 7, issue 2, 2010, Pages 191~202
DOI : 10.12989/cac.2010.7.2.191
A laboratory investigation was conducted to characterize the constitutive property behavior of Cor-Tuf, an ultra-high-performance composite concrete. Mechanical property tests (hydrostatic compression, unconfined compression (UC), triaxial compression (TXC), unconfined direct pull (DP), uniaxial strain, and uniaxial-strain-load/constant-volumetric-strain tests) were performed on specimens prepared from concrete mixtures with and without steel fibers. From the UC and TXC test results, compression failure surfaces were developed for both sets of specimens. Both failure surfaces exhibited a continuous increase in maximum principal stress difference with increasing confining stress. The DP tests results determined the unconfined tensile strengths of the two mixtures. The tensile strength of each mixture was less than the generally assumed tensile strength for conventional strength concrete, which is 10 percent of the unconfined compressive strength. Both concretes behaved similarly, but Cor-Tuf with steel fibers exhibited slightly greater strength with increased confining pressure, and Cor-Tuf without steel fibers displayed slightly greater compressibility.