Asian Journal of Civil Engineering

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  • ISSN
    1563-0854

Publications in this journal

  • Asian Journal of Civil Engineering 09/2014; 16(1):127-134.
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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.
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    ABSTRACT: Appropriate modeling of connections behavior is needed for seismic evaluation of structures. However, large dispersion is observed in welded steel moment frame connections performance during recent earthquakes and experimental tests. In this study, the effect of dispersion in pre-Northridge connections characteristics is investigated. Two mid-rise steel moment frames are designated. Various types of fractures in beam-column connections with various configurations are modeled. Sensitivity study is carried out on parameters affecting the structural response for two probability levels by implementation of nonlinear dynamic analysis. Results show that variation in connection characteristics moderately affects the displacement demands of structures.
    Asian Journal of Civil Engineering 01/2013; 14(2):253-268.
  • Asian Journal of Civil Engineering 12/2012;