Asian Journal of Civil Engineering

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ISSN 1563-0854

Publications in this journal

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    ABSTRACT: Utilization of industrial waste products in concrete is gaining importance all around the world due to the rise of environmental consciousness. Rubber from worn out tyres is one such waste material thought of by the researchers. Recycled rubber aggregates produce more elastic concrete, which has higher resistance to specific loads (impact loads, vibration and cyclic loads) compared to conventional concrete. Therefore, in this paper, the effect of crumb rubber on properties of Ordinary Portland Cement (OPC) Concrete and Ternary Blended Cement (TBC) Concrete of M40 grade are investigated with fly ash and silica fume as powders along with cement. TBC concrete has shown high energy absorption and higher strengths compared to OPC concrete.
    Asian Journal of Civil Engineering 08/2015; 16(7):933-941.
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    ABSTRACT: One of the ways to confront the problem of debonding failure of externally-bonded carbon fiber reinforced polymers (CFRP), used for strengthening of steel members, is to provide a proper and practical bonding detail. If the high stress-concentration zones of the bonded strip such as curtailment points of CFRP or member discontinuities are suitably detailed or reinforced, then bonding resistance will be improved. This paper describes experimentally the methods which successfully prevent the premature debonding failure of externally-laminated steel members. The double-lap shear test set up has been chosen as a frame work to compare the results. Therefore bond zones includes shear stresses and peel stresses. The mechanical clamps in different arrangements were examined as a bondenhancement detail. Also, the effect of the length of the CFRP laminate was investigated along with different types of end mechanical anchorage. Finally, a simple and efficient bonding enhancement method has been proposed, in the form of overlapping the critical debonding zones using steel plates. The test results show that both the overlapping and clamping methods considerably increase the bonding resistance, but the former method is preferable because of its simplicity for installation and because in this case further increase of strength is obtained.
    Asian Journal of Civil Engineering 01/2015; 16(1):97-110.
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    ABSTRACT: Due to the closed shape of box columns and difficult access to its inside for developing a reliable load path regarding rigid I-beam to box columns connections, in this study, some alternatives have been suggested to replace continuity plates. These alternatives are: two triangular plates, two rectangular plates and added stiff web. To evaluate the efficiency of these suggested alternatives, using ANSYS software, several beam-column connections in each alternative have been modeled. Based on the finite element results the behavior of I-beam connection to steel box column has been studied. Then the effects of suggested stiffeners on connection stiffness, strength and ductility have been investigated. The results showed that each of the suggested methods might be a good alternative for rigid connection with internal uniform continuity plates. However specimens of additional stiffened webs achieved highest connection strength and ductility.
    Asian Journal of Civil Engineering 01/2015; 16(2):219-233.
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    ABSTRACT: An analytical technique is used to solve the radius of curvature beam equation called the variational iteration method (VIM). VIM leads to high exactness of the solutions with only one repetition. It has been found that VIM is very prolific, rapid, functional, and do not demand small perturbation and is also sufficiently accurate to both linear and nonlinear problems in engineering. The obtained consequences show that the approximate solution is uniformly legitimate on the whole solution field in comparison with the numerical solution. VIM could simply be enlarged to other powerfully nonlinear problems and it could be found widely feasible in engineering and science. The results of this method (VIM) are compared with the obtained results of numerical solution that shows the results of the present method are in excellent agreement with numerical solution.
    Asian Journal of Civil Engineering 01/2015; 16(3):489-499.
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    ABSTRACT: Today for seismic behavior of structures, types of nonlinear static and dynamic analyzes are rapidly expanding. In this study, the nonlinear static method is used to evaluate the performance based on cold formed steel frames. Since these structures are typically performed with low levels, the first mode of vibration is dominate and evaluation of these structures with nonlinear static method, moreover reducing the analysis time, analytical results are obtained almost exact. In this research, after modeling 38 frames of cold formed steel with four different types of sheathing: OSB (Oriented strand board), DFP (Douglas fir plywood), CSP (Canadian softwood plywood) and GWB (Gypsum wall board) and considering different thickness of sheathings, target displacement and lateral drift ratio are calculates for different performance assessments. The results of the study in all the specimens indicates that the linear behavior of the structure is responsive to seismic design and performance point is elastic in the structural behavior.
    Asian Journal of Civil Engineering 01/2015; 16(6):789-802.
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    ABSTRACT: In this paper two recently developed meta-heuristic optimization methods, known as Colliding Bodies Optimization (CBO) and Enhanced Colliding Bodies Optimization (ECBO), are used for optimum nodal ordering to minimize bandwidth of sparse matrices. The CBO is a simple optimization algorithm which is inspired by a collision between two objects in one-dimension. Each agent is modeled as a body with a specified velocity and mass. A collision happens between pairs of bodies and the new positions of the colliding bodies are updated based on the collision laws. The enhanced colliding bodies optimization (ECBO) utilizes memory to save some best so-far-solution to improve the performance of the CBO without increasing the computational cost. This algorithm utilizes a mechanism to escape from local optima. The bandwidth of some graph matrices, which have equivalent pattern to structural matrices, is minimized using these approaches. Comparison of the obtained results with those of some existing methods shows the robustness of these two new meta-heuristic algorithms for bandwidth optimization.
    Asian Journal of Civil Engineering 01/2015; 16(4):535-545.
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    ABSTRACT: Quartic B-spline time integration method has been recently proposed for solving linear problems in structural dynamics. This paper developed this method to nonlinear dynamic analysis of single-degree-of-freedom (SDOF) systems under exploding loads. Using quartic B-spline basis function, this method gained second order of acceleration at each time-step. Thus it benefits from high accuracy compared to the methods in the literature. In this research, in order to applying the iterative process in the procedure, firstly, a series of standard formulas were derived from previous formulation. Then the Newton-Raphson iterative method used to develop new formulation for solving nonlinear dynamic problems. Finally, for the new scheme, a simple step-by-step algorithm is implemented and presented to calculate dynamic response of SDOF systems. The validity and effectiveness of the proposed method is demonstrated with two examples. The results were compared with those from the famous numerical method. The comparison shows that the proposed method is a fast and simple procedure with trivial computational effort.
    Asian Journal of Civil Engineering 01/2015; 16(2):183-202.
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    ABSTRACT: The aim of this paper is determining the probability of seismic vulnerability of two building, 8 and 5 storied, reinforced concrete residential building as examples of existing buildings in high risk area, in Tabriz. These structures have been modeled in 3D frame in SAP2000 software [17] and excitation with selected twenty ground motion records. Each record have 15 synthetic records. As a result, a total of 300 records were entered into SAP2000. We evaluate the ISDR at each storey and retain the maximum value to give an overall idea of the building damage level. By comparing structures response together and with damage states, it can be concluded that the structures reach to initially predicted performance. The study presented in this article summarizes the vulnerability analysis for the case studies of Tabriz in East Azerbaijan (the north-west of Iran). These buildings are of regular shape with 8 and 5 numbers of stories. The analysis consider seven damage states, from none to complete collapse, complying with Rossetto and Elnashai [15] classification.
    Asian Journal of Civil Engineering 01/2015; 16(8):1089-1101.
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    ABSTRACT: Nowadays, old existing buildings with less load carrying capacity are usually strengthened by the application of a suitable strengthening method. Such methods include the use of steel bracing, FRP jacketing or wrap, concrete jacketing, steel plating, shear wall and hybrid methods. However, there are the possibilities of selecting a strengthening method without comparing for the most efficient method, due to time constraint or little knowledge about strengthening methods. These will however, lead to ignoring the differences among the strengthening methods. In the present study, information about strengthening methods is highlighted as obtained from the survey. According to this information, decision selection program is set up, where different strengthening methods are encoded with their characteristics of solving problems. A case study is applied herewith to check the efficiency of the decision selection program. The recommended strengthening methods are ascertained to be relatively more economical, efficient and time saving.
    Asian Journal of Civil Engineering 01/2015; 16(2):203-218.