An investigation on staggered truss systems designed for high seismic risk zone
کد مقاله : 4331-IRAST
Mahbod Pirayesh *1، محسنعلی شایانفر2
1Department of Civil engineering, Iran university of science and technology
2دانشکده مهندسی عمران دانشگاه علم و صنعت ایران
چکیده مقاله:
In this investigation the Seismic behavior of Staggered Truss structures was evaluated. For this purpose, 15 Models of Staggered truss structures, were varied by the number of stories (4-, 10-, 20-stories) and the length of Vierendeel Panel, were designed in a high seismic risk zone. Then, based on the nonlinear static analysis, the seismic parameters of the structures, such as the over-strength factor, the Ductility factor, and the modification factor, R, were determined. According to this study if the vertical and diagonal chords remain linear under the seismic loads, the over-strength factor, the ductility factor and the modification factor of the structures greatly increase. Also by increasing the demand/capacity ratios and decreasing the length of Vierendeel panels, the ductility of the structures increases. Nonlinear analysis was also shown that the seismic parameters of structures decrease and the weight of structural materials per unit area increase while the number of stories increase.
کلیدواژه ها:
staggered truss; pushover analysis; steel frame design; ductility; modification factor
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