• Current Issue
  • SEISMIC ANALYSIS OF REINFORCED CONCRETE FRAME WITH BUCKLING RESTRAINED BRACE UNDER FAR AND NEAR FAULTS

    Today, Reinforced Concrete Frame with Buckling Restrained Brace (RCF-BRB) are commonly used as lateral resisting systems in seismic areas. Two characteristics of higher energy dissipation capacity and lack of buckling behaviour, has caused that RCF-BRB have a better alternative to conventional bracing. In this study, Seismic Analysis of RCF-BRB at far and near faults is investigated. Comparison of validation of BRB by ABAQUS software with laboratory model indicates acceptable agreement. In this paper, 3- and 5 story reinforced concrete frame with BRB were subjected to 6 earthquake scaled record, and roof displacement, base shear, force-displacement curve, and absorbed energy of the frame and its components were investigated. As well as stresses and plastic strain of frame components and BRB were also evaluated to find the causes of the weakness. The results showed that the far faults record has more destructive effects than the near faults record on the RCF-BRB and it was also found that the effective components in plastic deformation of BRB, are Core, and Gusset plate.

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  • Current Issue
  • NUMERICAL INVESTIGATION OF PERFORATED STEEL PLATE SHEAR WALL UNDER FIRE CONDITION

    The stability and lateral resistance of the Steel Plate Shear Wall (SPSW) is commonly used in earthquakes prone areas due to its high flexibility and energy absorption capacity in tall steel structures. Fire can significantly reduce the lateral resistance and stability of such structures. The purpose of this paper is to investigate the performance of Perforated Steel Plate Shear Wall (PSPSW) in the face of high temperatures. Therefore, 9 steel frames, each including one floor and one span, containing perforated steel plates, were numerically modelled and their behavioural characteristics were examined at high temperatures. Numerical results show that all seismic factors such as strength, stiffness and ductility in the lateral resistance and stability of Perforated Steel Plate Shear Wall (PSPSW) are reduced against high temperatures. Also, at high temperatures, it was found that before lateral loading, permanent plastic areas are formed, especially around the perforations, which increases the sensitivity of the system to the small earthquakes.

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  • Current Issue
  • OVER-STRENGTH DESIGN OF RC BEAMS ON FOUNDATIONS IN THE SEISMIC AREA

    A rigid plastic calculation method for predicting load versus maximum load pressures related to the formation of plastic hinges in the reinforced concrete (RC) beam on Winkler soil of foundation is proposed. The utility of the proposed method is to provide a simple calculation tool for hand calculation useful to predict the foundation’s bearing capacity and for verifying the over-strength of the soil-foundation complex. It is highlighted that the plastic resources of the soil-foundation complex depend not only on the characteristics of the soil, but also on the geometrical and mechanical characteristics of beam on foundation and the characteristics of the vertical load (intensity, eccentricity). The proposed method shows good agreement with numerical model developed with MIDAS Civil code. It is also shown that a maximum ratio of longitudinal steel bars should be adopted to ensure strength hierarchy with plasticization of RC beams before soil plasticization.

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  • Current Issue
  • A NEW MECHANICAL MODEL OF A LIQUID STORAGE TANK WITH BASE ISOLATION

    To reasonably predict the seismic response of the liquid storage tank under different earthquake records, a new mechanical model is proposed based on the equivalent principle of the base shear and the overturning moment. Firstly, the velocity potential of the liquid in the storage tank is introduced by resolving the Laplace equation. Thereafter, the governing equations of motion of a liquid storage tank with base isolation are derived on the basis of Hamilton’s principle. And finally, the dynamic response processes of the liquid storage tanks of different ratios of height to radius by using the existing mechanical models, proposed mechanical model, and three-dimensional finite element model in the software ANSYS are compared. The analysis results show that the proposed mechanical model is stable and reliable whilst the predicted results are highly accurate and effective. Given the high order convective modes, the liquid sloshing height has a delayed effect.

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