Papers by mona haghighifar
American Journal of Engineering and Applied Sciences, 2018
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Journal of Materials Research and Technology
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American Journal of Engineering and Applied Sciences, 2018
Nowadays, using infill isolators in Reinforced Concrete (RC) structures is very common. In earlie... more Nowadays, using infill isolators in Reinforced Concrete (RC) structures is very common. In earlier research this infill isolators are usually considered as non-structural elements, but in recent researches it was demonstrated that infill has considerable effects on natural period, stiffness, strength and overall behavior of structure specially when it is subjected to seismic ground motions. In this study a one-bay two-story masonry infilled RC frame is considered for a laboratory sample and various layouts of Carbon Fiber Reinforced Polymer (CFRP) layers have been used to retrofit and strengthen of masonry infill wall. These specimens have been modeled in ABAQUS and analyzed under cyclic loading with Finite Element Method (FEM). FEM analysis have been carried out using ABAQUS/Explicit software and analysis type have been chosen dynamic explicit. Finally, results of Finite Element Analysis have been compared against the experimental results. The effect of different CFRP configurations of retrofitting on ductility, ultimate lateral load capacity, stiffness and energy dissipation capacity of specimens have been discussed. Thereupon the best configuration has been proposed in terms of cost effectiveness and ductility. The results showed that in the frame with infill wall comparing with bare frame, load capacity increased about 277.35% and by comparing infilled frame with or without CFRP, it can be concluded that using CFRP can increase lateral load capacity of masonry infilled RC frames.
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During the period 1980 to the present few researchers such as Dean (1993) and Komar and MC Dougal... more During the period 1980 to the present few researchers such as Dean (1993) and Komar and MC Dougal (1994) and some others have tried to provide the appropriate equations of seabed shape changes according to different parameters such as the diameter of the seabed grain, grains of density, wave break height and other parameters under equilibrium beach profile. These equations determine the important parameters for the design of coastal structures and ports have many mistakes, that this caused the higher risk of design.This research tries to preset the most accurate EBP 1 equations for some important Iranian beaches located on the southern coasts of the Caspian Sea. This leads to future improves in design of port facilities and structures by minimizing the probable errors and risks due to more accurate EBPs. The results of this study show that the suggested equilibrium profile equation of Dean reasonably is in a good agreement with the behavior of the cross-shore profile of the Southern Caspian Sea. By applying the equations of equilibrium profiles and comparing those to the shores of the Southern Caspian Sea, can be seen that the Dean Equilibrium profile is more compatible with the profile of the Caspian Sea Coast.
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American Journal of Engineering and Applied Sciences, 2018
Civil engineers have considered Fiber Reinforced Polymer (FRP) materials to enhance the performan... more Civil engineers have considered Fiber Reinforced Polymer (FRP) materials to enhance the performance of structural members subjected to static and dynamic loading conditions. However, there are some design limitations due to uncertainty in the behavior of such strengthened members. This fact is particularly important when considering the complex nature of the nonlinear behavior of materials, the impact loading conditions and geometry of the members having FRP systems. In this research, a new analytical model is developed to analyze structural members strengthened with FRP systems and subjected to impact loading conditions. ABAQUS based finite element code was used to develop the proposed model. The model was validated against nine beams built and tested with various configurations and loading conditions. Three sets of beams were prepared and tested under quasistatic and impact loadings by applying various impact height and Dynamic Explicit loading conditions. The first set consisted of two beams, where one of the beams was reinforced with steel bars and the other was externally reinforced with GFRP sheet. The second set consisted of six beams, with five of the beams were reinforced with steel bars and one of them wrapped by GFRP sheet. The last set was tested to validate the response of concrete beams reinforced by FRP bar. In addition, beams were reinforced with glass and carbon fiber composite bars tested under Quasi-Static and Impact loading conditions. The impact load was simulated by the concept of a drop of a solid hammer from various heights. The numerical results showed that the developed model can be an effective tool to predict the performance of retrofitted beams under dynamic loading condition. Furthermore, the model showed that FRP retrofitting of RC beams subjected to repetitive impact loads can effectively improve their dynamic performance and can slow the progress of damage.
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Papers by mona haghighifar