تحليل كاهندگي تقاضاي لرزه¬اي قابهاي خمشي فولادي برحسب فاصله از گسل
محورهای موضوعی : آنالیز سازه - زلزله
ایوب مهری ده نو
1
,
حسن آقابراتی
2
,
مهدی مهدوی عادلی
3
1 - گروه مهندسی عمران، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران
2 - گروه مهندسی عمران، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران
3 - گروه مهندسی عمران، واحد تهران غرب، دانشگاه آزاد اسلامی، تهران، ایران
کلید واژه: تحلیل دینامیکی غیر خطی, آمار بیزین, حوزۀ دور و نزدیک گسل, تقاضای لرزه¬ای,
چکیده مقاله :
در تخمین تقاضای لرزه‌ای سازه¬ها عدم‌قطعیت‌های متعددی وجود دارد که فاصله تا گسل یکی از مهم‌ترین آنها می‌باشد. اما بنظر می‌رسد که با توجه به ماهیت متفاوت حوزه نزدیک گسل، این تأثیر فاصله بر تقاضای لرزه‌ای، در حوزه دور و نزدیک گسل متفاوت خواهد بود. ارزیابی این موضوع و تعیین تفاوت تأثیر فاصله گسل تا ساختگاه بر تقاضای لرزه‌ای قابهای خمشی فولادی در حوزه دور و نزدیک گسل با استفاده از تحلیل دینامیکی غیرخطی و آمار بیزین هدف اصلی در این تحقیق می‌باشد. استفاده از تحلیل دینامیکی غیرخطی بمنظور پوشش دادن رفتار واقعی غیرخطی سازه در سطوح عملکرد نزدیک فروریزش و استفاده از آمار بیزین با هدف پوشش دادن کلیۀ عدم¬قطعیت¬های موجود انتخاب شده است. در تحقیق حاضر و به منظور نیل به اهداف مورد نظر، در دو قاب خمشی فولادی مشابه سه طبقۀ و پانزده طبقه، پس از مدلسازی غیر خطی آنها در محیط نرم افزار اپن¬سیس، تحت اثر پنج گروه چهل¬تایی شتابنگاشت که بجز فاصله تا گسل آنها، سایر مشخصات این شتابنگاشت¬ها یکسان انتخاب شده بود تحلیل دینامیکی غیرخطی افزاینده گردیدند و نتایج حاصل در تعیین تقاضای لرزه¬ای آنها مورد استفاده قرار گرفت که با توجه به اینکه تنها متغیر در این تحلیل فاصله تا گسل می‌باشد، می¬توان اختلاف نتایج را به این متغیر نسبت داد. بر اساس نتایج حاصل در این تحقیق از دیدگاه آماری بین تأثیر تغییرات فاصله بر تقاضای لرزه¬ای در حوزۀ دور و نزدیک گسل تفاوت وجود دارد که این تفاوت تابع متغیرهایی همچون رفتار خود قاب و سطح عملکرد آن خواهد بود.
There are many uncertainties in the estimation of the seismic demand of structures, and the distance to the fault is one of the most important ones. But it seems that due to the different nature of the area near the fault, this effect of distance on the seismic demand will be different in the area near and far from the fault. Evaluating this issue and determining the difference between the distance between the fault and the building on the seismic demand of steel bending frames in the area near and far from the fault is the main goal of this research. In the current research and in order to achieve the desired goals, in two similar steel bending frames with three and fifteen floors, after their nonlinear modeling in the OpenSsees software, under the effect of five groups of 40 accelerometers, except for the distance to their fault Other characteristics of these records were chosen the same, nonlinear dynamic analysis was added and the results were used to determine their seismic demand, considering that the only variable in this analysis is the distance to the fault, the difference in the results can be attributed to ratio variable. Based on the results of this research, from a statistical point of view, there is a difference between the effect of distance changes on the seismic demand in the far and near fault areas, and this difference will depend on variables such as the behavior of the frame itself and its performance level.
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