نوع مقاله : علمی - پژوهشی
نویسندگان
1 کارشناس ارشد مهندسی عمران گرایش سازه، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران
2 دانشیار، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
This article examines the seismic performance of mid-range steel flexural frame buildings with different mass irregularity percentages designed in accordance with Iranian and foreign valid regulations. For this purpose, a 6-story building located on type C soil and for the Tehran region, which has a very high earthquake risk zone, has been considered for study. Assuming that the investigated buildings were built on type C soil and on type D soil, 22 records far from the fault were analysised in terms of soil-structure interaction and different mass irregularities in height at two levels of DBE and MCE earthquakes. These buildings are simulated in OpenSees finite element software where the nonlinear behaviour of geometry and materials is considered. The results showed that in structures with rigid and flexible foundations, under two levels of earthquake in two types of soil C and D with any type of mass irregularity, the values of relative displacements and acceleration have different patterns. So that the irregular mass changes (decrease and increase) have changed the amount of relative displacements in the lower floors of the structure compared to the regular state (decrease and increase, respectively). While in the upper floors, relative displacements have been created with irregular mass changes (decrease and increase), change (increase and decrease, respectively). In all classes of the irregular structure compared to the regular structure, increasing or decreasing the irregular mass will increase and decrease the absolute acceleration values, respectively. By changing the type of soil from state C to state D, the responses of buildings increase. In general, taking into account the type of local soil (type D instead of C) has increased the amount of relative displacements with less mass irregularities and acceleration by 50% and the amount of relative displacements with more mass by 65% on average.
کلیدواژه‌ها [English]
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