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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 14, Issue 6 - Dec 2014
Volume 14, Issue 5 - Nov 2014
Volume 14, Issue 4 - Oct 2014
Volume 14, Issue 3 - Sep 2014
Volume 14, Issue 2 - Aug 2014
Volume 14, Issue 1 - Jul 2014
Volume 13, Issue 6 - Jun 2014
Volume 13, Issue 5 - May 2014
Volume 13, Issue 4 - Apr 2014
Volume 13, Issue 3 - Mar 2014
Volume 13, Issue 2 - Feb 2014
Volume 13, Issue 1 - Jan 2014
Selecting the target year
Modeling of post-tensioned one-way and two-way slabs with unbonded tendons
Kim, Uksun ; Huang, Yu ; Chakrabarti, Pinaki R. ; Kang, Thomas H.K. ;
Computers and Concrete, volume 13, issue 5, 2014, Pages 587~601
DOI : 10.12989/cac.2014.13.5.587
A sophisticated finite element modeling approach is proposed to simulate unbonded post-tensioned concrete slabs. Particularly, finite element contact formulation was employed to simulate the sliding behavior of unbonded tendons. The contact formulation along with other discretizing schemes was selected to assemble the post-tensioned concrete system. Three previously tested unbonded post-tensioned two-way and one-way slabs with different reinforcement configurations and boundary conditions were modeled. Numerical results were compared against experimental data in terms of global pressure-deflection relationship, stiffness degradation, cracking pattern, and stress variation in unbonded tendons. All comparisons indicate a very good agreement between the simulations and experiments. The exercise of model validation showcased the robustness and reliability of the proposed modeling approach applied to numerical simulation of post-tensioned concrete slabs.
Implication of rubber-steel bearing nonlinear models on soft storey structures
Saiful Islam, A.B.M. ; Hussain, Raja Rizwan ; Jumaat, Mohammed Zamin ; Mahfuz ud Darain, Kh. ;
Computers and Concrete, volume 13, issue 5, 2014, Pages 603~619
DOI : 10.12989/cac.2014.13.5.603
Soft storey buildings are characterised by having a storey that has a large amount of open space. This soft storey creates a major weak point during an earthquake. As the soft stories are typically associated with retail spaces and parking garages, they are often on the lower levels of tall building structures. Thus, when these stories collapse, the entire building can also collapse, causing serious structural damage that may render the structure completely unusable. The use of special soft storey is predominant in the tall building structures constructed by several local developers, making the issue important for local building structures. In this study, the effect of the incorporation of an isolator on the seismic behaviour of tall building structures is examined. The structures are subjected to earthquakes typical of the local city, and the isolator is incorporated with the appropriate isolator time period and damping ratio. A FEM-based computational relationship is proposed to increase the storey height so as to incorporate the isolator with the same time period and damping ratio for both a lead rubber bearing (LRB) and high-damping rubber bearing (HDRB). The study demonstrates that the values of the FEM-based structural design parameters are greatly reduced when the isolator is used. It is more beneficial to incorporate a LRB than a HDRB.
Prediction of compressive strength for HPC mixes containing different blends using ANN
Lingam, Allam ; Karthikeyan, J. ;
Computers and Concrete, volume 13, issue 5, 2014, Pages 621~632
DOI : 10.12989/cac.2014.13.5.621
This paper is aimed at adapting Artificial Neural Networks (ANN) to predict the compressive strength of High Performance Concrete (HPC) containing binary and quaternary blends. The investigations were done on 23 HPC mixes, and specimens were cast and tested after 7, 28 and 56 days curing. The obtained experimental datas of 7, 28 and 56 days are trained using ANN which consists of eight input parameters like cement, metakaolin, blast furnace slag and fly ash, fine aggregate, coarse aggregate, superplasticizer and water binder ratio. The corresponding output parameters are 7, 28 and 56 days compressive strengths. The predicted values obtained using ANN show a good correlation between the Experimental data. The performance of the 8-9-3-3 architecture was better than other architectures. It concluded that ANN tool is convenient and time saving for predicting compressive strength at different ages.
Earthquake safety assessment of an arch dam using an anisotropic damage model for mass concrete
Xue, Xinhua ; Yang, Xingguo ;
Computers and Concrete, volume 13, issue 5, 2014, Pages 633~648
DOI : 10.12989/cac.2014.13.5.633
The seismic safety of concrete dams is one of the important problems in the engineering due to the vast socio-economic disasters which may be caused by collapse of these infrastructures. The accuracy of the risk evaluation associated with these existing dams as well as the efficient design of future dams is highly dependent on a proper understanding of their behaviour due to earthquakes. This paper develops an anisotropic damage model for arch dam under strong earthquakes. The modified Drucker-Prager criterion is adopted as the failure criteria of the dynamic damage evolution of concrete. Some process fields and other necessary information for the safety evaluation are obtained. The numerical results show that the seismic behaviour of concrete dams can be satisfactorily predicted.
An investigation of water magnetization and its influence on some concrete specificities like fluidity and compressive strength
Khorshidi, N. ; Ansari, M. ; Bayat, M. ;
Computers and Concrete, volume 13, issue 5, 2014, Pages 649~657
DOI : 10.12989/cac.2014.13.5.649
In this paper, effects of magnetic water on different properties of cement paste including fluidity, compressive strength, time of setting and etc, has been studied in concrete laboratory of Sahand University of Technology. For production of magnetic water, three devices including an AFM called device(made in UAE), a device marked AC(made in Germany) and finally a device was designed and made in Concrete Laboratory of Sahand University of Technology) have been used. The results show that, intensity and direction of magnetic field, velocity and time of water passing through magnetic device, and amount and type of Colloidal particles have direct effects on properties of magnetic water and using such a water in making cement paste, increases its fluidity and compressive strength up to 10%.
Bayesian updated correlation length of spatial concrete properties using limited data
Criel, Pieterjan ; Caspeele, Robby ; Taerwe, Luc ;
Computers and Concrete, volume 13, issue 5, 2014, Pages 659~677
DOI : 10.12989/cac.2014.13.5.659
A Bayesian response surface updating procedure is applied in order to update the parameters of the covariance function of a random field for concrete properties based on a limited number of available measurements. Formulas as well as a numerical algorithm are presented in order to update the parameters of response surfaces using Markov Chain Monte Carlo simulations. The parameters of the covariance function are often based on some kind of expert judgment due the lack of sufficient measurement data. However, a Bayesian updating technique enables to estimate the parameters of the covariance function more rigorously and with less ambiguity. Prior information can be incorporated in the form of vague or informative priors. The proposed estimation procedure is evaluated through numerical simulations and compared to the commonly used least square method.
Investigation of nonlinear behaviour of reinforced concrete frames having different stiffening members
Gursoy, Senol ;
Computers and Concrete, volume 13, issue 5, 2014, Pages 679~694
DOI : 10.12989/cac.2014.13.5.679
The selected carrier systems of reinforced concrete frame buildings are quite important on structural damages. In this study are examined comparatively nonlinear behaviours of reinforced concrete frames which having different stiffening members under a horizontal load. In that respect, the study consists of six parametric models. With this purpose, nonlinear structural analyses of reinforced concrete frames which having different stiffening members were carried out with LUSAS which uses the finite element method. Thus, some conclusions and recommendations to mitigate the damage of reinforced concrete buildings in the future designs are aimed to present. The obtained results revealed that in terms of performance, the x-shaped diagonal elements can be used as an option to shear walls. In addition, it was found that frame-2, frame-3 and frame-4 showed a better performance than traditional frame system (frame-1).