In this paper, the behavior of steel frames with gypsum board infill walls is studied through finite element simulation. For this purpose, a typical steel frame with infill wall which had been previously tested is considered as a benchmark model. The accuracy of a numerical model is verified by calibrating the results of the finite element simulation against those of a corresponding experimental specimen. In the next step, a parametric study is performed on four models in order to study the effects of gypsum board thickness, inclusion of fibers as reinforcement in the infill wall, and local strengthening of the peripheral regions of the infill wall. Each of these factors is related to considerable performance improvement such as strength and ductility of the models. It is observed that adding fibers to the infill wall leads to increase in the strength and ductility of the models up to 3.2 and 6.3 times, respectively. Doubling the thickness of the infill wall results in an increase of 6.7 and 3.3 times in strength and stiffness, respectively; however, this modification causes a significant decrease in the ductility of the infilled frames. Negligible improvement in strength and ductility is achieved through local strengthening of the peripheral regions of the infill walls, whereas it leads to a 30% increase in the stiffness of the models.
The objective of present study is to improve the performance of steel structures, Implementing ADAS yielding damper, by means of non-linear analysis. ANSYS software is utilized to model ADAS damper. 3 buildings of 5, 10 and 15 stories are studied with and without damper. Non-linear method was used to analyze. Load, displacememt, ductility, energy absorption and total strength graphs of different samples were compared. The results represent that in the 5-story structure, addition of ADAS damper leads a 3 time increment of total strength, 57% increment of ductility and 164% increment of energy damping. In the 10-story structure, addition of ADAS damper leads a 143% increment in total strength, a 25% increment in ductility and 104% increment of energy absorption. In 15-story structure, addition of ADAS damper leads a 24% increment in total strength, a 11% increment in ductility and a 40% increment in energy absorption. Maximum ductility is related to the model 6 with a value of 6.03 and the minimum ductility is obtained in model 1 with a value of 3.12. The maximum total strength is related to model 6, equal to 2913 tons and model 1 is related to minimum total strength of 632 tons. When comparing the energy absorption, model 1 and model 6 had the minimum and the maximum values relatively. To conclude, ADAS damper has the highest effect on short structures. The best performance of ADAS damper in comparison with the same sructure without damper is observed in 5-story buildings.
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