بررسی رفتار سازه‌ فولادی قاب خمشی متّکی بر پی‌های عمیق تحت اثر حرکت نسبی حاصل از شکست گسل نرمال

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری سازه، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد نور، نور، ایران

2 استادیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد نور،نور ایران

3 استادیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد نور، نور، ایران

4 استادیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه دامغان، دامغان، ایران

چکیده

زلزله‌های اخیر نشان داد که درکنار نیروهای لرزه‌ای، اندرکنش بین گسلش و سازه می‌تواند منجر به خسارت زیادی به سازه‌های سطحی و زیرزمینی شود. در این مطالعه، مدل المان محدود سه بعدی در برنامه‌ اجزاء محدود آباکوس به منظور مطالعه رفتار یک سازه‌ 9 طبقه فولادی با سیستم قاب خمشی متّکی بر سه نوع پی گسترده، گروه شمع و دیواره‌ دیافراگمی واقع بر خاک ماسه‌ای مورد استفاده قرار گرفت. تحلیل بکار گرفته شده در این مطالعات از نوع استاتیکی غیرخطی و نوع بارگذاری به صورت کنترل تغییرمکان در بستر خاک می‌باشد. عملکرد سیستم سازه-پی با در نظر گرفتن اهداف عملکردی سازه‌ای و ژئوتکنیکی نظیر نسبت دریفت طبقات، تغییرمکان پی و توزیع لنگر خمشی و نیروی برشی در طول بدنه شمع و پی مورد ارزیابی قرار گرفت. در این مطالعه، موقعیّت پی نسبت به خط اثر گسل و نوع پی به عنوان پارامترهای کلیدی در نظر گرفته شدند. نتایج تحلیل نشان داد بهترین عملکرد در کاهش نسبت دریفت ماندگار طبقات مربوط به سازه با سیستم دیواره دیافراگمی در پی است که در وضعیّتی که لبه پی به محل خط اثر گسل مماس باشد، این مقدار به 62/1 درصد می‌رسد. همچنین در اکثر حالات، در مقادیر کوچک بالاآمدگی گسل، سیستم پی گسترده دارای نشست تفاضلی کمتری نسبت به سایر پی‌های مورد بررسی در این مطالعه بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of steel moment-resisting frame relies on deep foundation under normal fault rupture

نویسندگان [English]

  • Omid Nooralizadeh 1
  • Sepideh Rahimi 2
  • Mohamad Hoseinzadeh 3
  • Mehdi Ebadi Jamkhaneh 4
1 Ph.D. Candidate of Structural Engineering,, Department of Civil Engineering, School of Engineering, Islamic Azad University Nour Branch, Nour, Iran.
2 Assistant Professor, Department of Civil Engineering, School of Engineering, Islamic Azad University Nour branch,, Nour, Iran.
3 Assistant Professor, Department of Civil Engineering, School of Engineering, Islamic Azad University Nour Branch, Nour, Iran
4 Assistant Professor, Department of Civil Engineering, School of Engineering, Damghan University, Damghan, Iran
چکیده [English]

Recent earthquakes have shown that, besides the seismic forces, the interaction between faults and structures could cause extensive damage to the surface and underground structures. Field observations showed that the need for design measures and regulations for fault loading due to fault movement in areas with active faults seems necessary. In this study, the three-dimensional finite element model in Abaqus finite element program to study the behaviour of a 9-story steel structure with a moment frame system based on three types of mat foundations, piles group, and diaphragm walls was used on sandy soil. The performance of the structural-foundation system was evaluated taking into account the structural and geotechnical performance goals such as the drift ratio of floor levels, displacement of the foundation and distribution of bending moment and shear force along with the pile and foundation. In this study, the position of the foundation relative to the fault line and the foundation type were considered as key parameters. The results of the analysis showed that the best performance in reducing the ratio of the permanent drift ratio of the floors related to the structure with the diaphragm wall system. This was in the case that the edge of the foundation is tangent to the fault line, this value reaches 1.62%. Also, in most cases, in small amounts of fault movements, the mat foundation system had a smaller difference than the other considered foundation system in this study.

کلیدواژه‌ها [English]

  • soil-structure interaction
  • normal fault rupture
  • fault angle
  • steel structure
  • permanent drift ratio

مراجع

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مهندسی سازه و ساخت
دوره 9، شماره 2 - شماره پیاپی 55
اردیبهشت 1401
صفحه 152-171

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  • تاریخ دریافت: 03 تیر 1400
  • تاریخ بازنگری: 28 شهریور 1400
  • تاریخ پذیرش: 08 مهر 1400

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