ارزیابی امکان رخداد گسیختگی پیشرونده در قابهای خمشی فولادی(معمولی، متوسط و ویژه) بر اثرحذف ستون

مهدی زاده, کوروش; کرم الدین, عباس

doi:10.22065/jsce.2017.89028.1231

ارزیابی امکان رخداد گسیختگی پیشرونده در قابهای خمشی فولادی(معمولی، متوسط و ویژه) بر اثرحذف ستون

نوع مقاله : علمی - پژوهشی

نویسندگان

¹ دانشجوی دکتری مهندسی عمران، دانشگاه فردوسی مشهد، مشهد، ایران

² دانشیار، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

10.22065/jsce.2017.89028.1231

چکیده

ساختمانها در طول عمر مفید خود ممکن است تحت تاثیر تهدیدات خارجی مختلفی قرار گیرند. این تهدیدات می توانند با آسیب رساندن به المانهای اصلی ساختمان باعث گسترش خرابی و گسیختگی پیشرونده در سازه گردند. طی دهه های اخیر محققین تلاش گسترده ای در مورد نحوه ی مقابله با پدیده های غیر طبیعی مانند انفجار، تصادف و خرابکاری های تروریستی نموده اند. در این تحقیق یک سازه ی 5 طبقه ی فولادی با سیستم های قاب خمشی معمولی، متوسط ویژه ( معادل شکل پذیری های کم، متوسط و زیاد) بر اساس آئین نامه های داخلی طراحی و ضوابط هر کدام کنترل شده اند. در ادامه با انتخاب یک قاب میانی، امکان رخداد گسیختگی پیشرونده در اثر حذف ستون های کناری و میانی هر سه قاب بر اساس دستورالعمل های GSA و UFC بررسی شده است. با تعریف مفاصل پلاستیک متمرکز در انتهای المانها و با استفاده از پارامترهای کاهندگی مقاومت و سختی حاصل از مطالعات آزمایشگاهی سایر محققین، رفتار دینامیکی غیر خطی قابها در اثر حذف ستون بررسی شده است. نتایج نشان می دهد که امکان آسیب قاب های خمشی فولادی ویژه بیش از قابهای خمشی متوسط و معمولی می باشد. همچنین نتایج مشخص می کند که بر خلاف مقاوم سازی های لرزه ای که فراهم کردن شکل پذیری روشی مهم برای کاهش آسیب ساختمانها می باشد، در خرابی های ناشی از بارهای ثقلی، بیشتر بودن مقاومت و سختی اعضا می تواند گسترش خرابی را محدود نماید.

کلیدواژه‌ها

موضوعات

خرابی پیشرونده

عنوان مقاله [English]

Evaluation the possibility of the occurrence of progressive collapse in steel moment frames (ordinary, intermediate and special) due to sudden column removal

نویسندگان [English]

Kourosh Mehdizadeh ¹
Abbas Karamodin ²

¹ PhD Candidate, Department of Civil Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

² Associate Professor, Department of Civil Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

چکیده [English]

Buildings during their useful life may be affected by different external threats. These threats can harm the key elements of buildings and thus lead to progressive collapse. In recent decades, researchers have been working extensively on how to deal with abnormal events such as explosions, accidents and terrorist attacks. In this study, a typically 5-story steel structure with ordinary, intermediate and special (low, medium and high ductility levels) moment frames designed based on internal regulations and all criteria have been controlled. Then by selecting a middle two-dimensional frame, the possibility of occurrence of progressive collapse caused by the sudden removal of corner and middle columns of all three frames have been investigated based on the guidelines of the GSA and the UFC. By defining the concentrated plastic hinges at the element ends and by using the strength and stiffness attenuation parameters resulted from laboratory studies of other researchers, non-linear dynamic behavior of frames due to sudden removal of columns have been investigated. Results show that the possibility of damage to special moment frame is more than the intermediate and ordinary moment frames. Also the results indicate unlike the seismic retrofitting that providing ductility is an important method to reduce damages to the buildings, for damages caused by gravity loads, higher strength and stiffness can limit the progress of damages.

کلیدواژه‌ها [English]

Steel Moment Resistance Frame
Progressive collapse
Ductility
Deterioration
GSA Guideline
UFC Guideline

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