ارزیابی عملکرد ساختمان‌های قاب خمشی بتن مسلح واقع بر شالوده سطحی با لحاظ کردن تأثیر اندرکنش خاک و سازه

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

دانشکده مهندسی، دانشگاه کاشان

چکیده

     رفتار غیر خطی سیستم خاک و سازه با تحمیل انعطاف­پذیری مازاد بر سیستم و اتلاف انرژی چرخه­ای در فصل مشترک خاک و شالوده تقاضای لرزه­ای سازه را تغییر می­دهد. در این مقاله، از روش تیر بر روی شالوده غیر خطی وینکلر برای ارزیابی تأثیر اندرکنش خاک- پی- سازه بر عملکرد لرزه­ای ساختمان­ها استفاده می­شود. مجموعه­ای از ساختمان­های بتن مسلح 4، 8، 12 و 16 طبقه با سیستم قاب خمشی ویژه واقع بر سه نوع خاک سخت، متوسط و نرم توسط نرم­افزار OpenSees مدل­سازی و تحلیل ‌شده‌اند. از روش­های تحلیل استاتیکی غیر خطی و تحلیل دینامیکی افزایشی جهت ارزیابی عملکرد لرزه­ای ساختمان­های بتن مسلح در شرایط پایه ثابت و انعطاف­پذیر استفاده ‌شده است. نتایج تحلیل نشان می­دهد که اندرکنش خاک و سازه، به خصوص با نرم­تر شدن خاک و افزایش تعداد طبقات ساختمان، می­تواند نقشی اساسی در رفتار قاب­های ساختمانی شامل افزایش پریود سیستم، تغییر ضریب اصلاح پاسخ، افزایش دریفت طبقات، کاهش سطح عملکرد و تغییر احتمال فروریزش سازه ایفا نماید. لذا بر اساس نتایج به دست آمده، اکتفا به نتایج تحلیل­های متداول (بدون درنظر گرفتن اندرکنش) دقت ارزیابی عملکرد سازه را خدشه­دار نموده و ممکن است به طرح غیر واقعی سازه منجر گردد.

کلیدواژه‌ها


عنوان مقاله [English]

Seismic Performance Assessment of RC MRF Buildings on Shallow Foundations Incorporating Soil-Structure Interaction

نویسندگان [English]

  • Ali Mohamadi
  • Hossein Tahghighi
Faculty of Engineering, University of Kashan
چکیده [English]

For the structure resting on a flexible medium, the dynamic response of the structure will be different from the fixed-base condition owing to the interaction between the soil and the structure. Nevertheless, the common practice in seismic performance assessment assumes that structures are fixed to their base, which maybe a realistic hypothesis only when these are founded on relatively solid rock or very stiff soil. In the case of a flexible-base structure, in addition to the added rocking component to the horizontal motion of the structure, a part of the structure’s vibrating energy will transmit to the soil layer and can be dissipated due to radiation damping resulting from the wave propagation and hysteresis damping of the soil materials (Lou et al., 2011). Soil-structure interaction (SSI) are generally shown to be more pronounced in the case of soft soil formations and high-rise structures modifying considerably the dynamic characteristics of the building and finally its response (Tahghighi and Rabiee, 2017). The objective of the present research is to study whether SSI may affect the seismic performance and vulnerability of reinforced concrete moment resisting frame (MRF) buildings.

کلیدواژه‌ها [English]

  • Soil-structure interaction
  • Performance assessment
  • Reinforced concrete frame
  • Pushover analysis
  • Incremental dynamic analysis
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