Asian Journal of Civil Engineering

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ISSN 1563-0854

Publications in this journal

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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: Alkali Activated Slag (AAS) concrete is a combination of blast furnace slag and alkaline solution that is used as a binder. In this paper, Taguchi method was used to design of AAS mixtures. By considering four affecting factors including concentration of sodium hydroxide (NaOH) solution, sodium hydroxide to sodium silicate ratio, alkaline solution to slag ratio, and aggregate content, the optimal mixture design that provides the maximum compressive strength and flexural strength was identified. To verify the results, the optimal mixture was produced and tested. The mixture resulted in more compressive strength and flexural strength than other mixes.
    Asian Journal of Civil Engineering 01/2015; 16:505-513.
  • Asian Journal of Civil Engineering 09/2014; 16(1):127-134.
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    ABSTRACT: This paper devoted to analysis of cracked truss type structures. For this purpose, five common cracked bar finite elements, according to the laws of fracture mechanics, are first introduced and verified. Parameters which affect the stiffness matrix of the cracked element are also evaluated. In this paper, a procedure for calculation of stress intensity factor (SIF) by employing cracked element is proposed. A simple cracked truss structure is finally studied. Furthermore, this article could be considered as a relatively comprehensive source of the common cracked bar elements.
    Asian Journal of Civil Engineering 01/2014; 15(4):517-533.
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    ABSTRACT: This paper deals with to determine the first natural frequency of tall buildings consists of framed tube, shear core, belt truss and outrigger system with multiple jumped discontinuities in the cross section of framed tube and shear core. In this paper, the continuous approach was accepted and by using energy method and Hamilton’s variational principle, the governing equation for free vibration of tall building can be obtained. The entire length of tall building is partitioned into uniform segments between any two successive discontinuity points and therefore partial differential equation of motion, by applying the separation of variables method on time and space, is reduced to an ordinary differential equation with constant coefficients for each segment. Tall building characteristics matrix can be derived based on the boundary conditions and the continuity conditions applied at the partitioned points. This matrix is particularly used to find combined system natural frequencies and mode shapes. A numerical example has been solved to demonstrate the reliability of this method. The results of the proposed mathematical model give a good understanding of the structure’s dynamic characteristics; it is easy to use, yet reasonably accurate and suitable for quick evaluations during the preliminary durations.
    Asian Journal of Civil Engineering 01/2014; 15.
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    ABSTRACT: In the present study, compressive strength of normal concrete together with gas permeability of concrete containing various percentages of TiO2 and ZnO nanoparticles were investigated and the results were compared with each other and with that of the normal concrete. More types of tests were carried out on the specimens including X-ray diffraction (XRD) and Scanning electron microscopy (SEM). The results indicated that TiO2 nanoparticles decreased the compressive strength after 28 days of curing; however, the permeability of concrete was lowered. Moreover, it seems that by adding TiO2 nanoparticles up to 4wt% of the cement the mechanical and physical properties of concrete may improve. The ZnO nanoparticles strongly retard the setting time and increasing the amount of ZnO nanoparticles in the mixture, thoroughly stops the hydration process within the concrete and prohibits the formation of mortar. As concluded from XRD diagrams, it seems that an amorphous layer of Zn(OH)2 is the main reason that prohibits C3S phase to participate in hydration process. Besides, with increase in percentage of the ZnO nanoparticles in concrete mixture, the lower compressive strength was obtained.
    Asian Journal of Civil Engineering 01/2013; 14(4):517-531.