ارزیابی شکنندگی لرزه‌ای قاب‌های خمشی بتنی ویژه‌ منظم و نامنظم با لحاظ اثر غیرخطی چشمه‌ اتصال و اندرکنش خاک- فونداسیون- سازه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران.

2 دانشیار گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

ارزیابی دقیق شکنندگی لرزه‌ای قاب‌های خمشی بتن‌آرمه‌ ویژه مستلزم در نظر گرفتن عوامل مؤثر بر پاسخ غیرخطی سازه‌ها است. در پژوهش حاضر، یک چارچوب یکپارچه برای ارزیابی شکنندگی این قاب‌ها ارائه شده است که اثرات اندرکنش خاک- فونداسیون- سازه، رفتار غیرخطی چشمه‌ اتصال تیر به ستون، طول دهانه‌ قاب، نوع و محل قرارگیری نامنظمی‌های سازه‌ای در ارتفاع به صورت همزمان در نظر گرفته می‌شوند. سازه‌های پنج طبقه براساس ضوابط لرزه‌ای آیین‌نامه‌های ایران و ACI318-19 طراحی و در نرم‌افزار OpenSees مدل‌سازی شده‌اند. ارزیابی عملکرد لرزه‌ای با استفاده از تحلیل دینامیکی افزایشی و مجموعه‌ای از شتاب‌نگاشت‌های حوزه‌ دور از گسل دستورالعمل FEMA P695 انجام شده و حداکثر تغییرمکان نسبی بین طبقه‌ای به‌عنوان تقاضای لرزه‌ای در نظر گرفته شده است. در ادامه، منحنی‌های شکنندگی برای چهار سطح عملکرد استخراج گردیده‌اند. نتایج به‌دست آمده نشان داد که نامنظمی سختی جانبی در طبقه‌ اول، در هر دو پیکربندی قاب، بیشترین اثر نامطلوب را بر شکنندگی لرزه‌ای سازه دارد. همچنین، درقاب‌های با دهانه‌ کوتاه، تمرکز جرم در طبقه‌ اول و در قاب‌های با دهانه‌ بلند، تمرکز جرم در طبقه‌ سوم، موجب افزایش آسیب‌پذیری لرزه‌ای شد. بر این اساس، ملاحظه شد که اثر نوع و محل وقوع نامنظمی‌ها به مشخصات هندسی قاب وابسته است و این وابستگی در حضور اندرکنش خاک- فونداسیون- سازه و رفتار غیرخطی چشمه‌ اتصال تیر به ستون افزایش می‌یابد. نادیده گرفتن این عوامل در ارزیابی شکنندگی قاب‌های خمشی بتن‌آرمه‌ ویژه با الگوهای مختلف نامنظمی می‌تواند به برآورد نادرستی از آسیب‌پذیری لرزه‌ای سازه منجر شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Seismic Fragility Assessment of Regular and Irregular Special RC Moment-Resisting Frames Considering Nonlinear Joint Panel Effect and Soil-Foundation-Structure Interaction

نویسندگان [English]

  • Maryam Zare Aghbolagh 1
  • Hamed Rahman Shokrgozar 2
  • Vahid Akrami 2
1 Ph.D. Student, Department of Civil Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.
2 Associate Professor, Department of Civil Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.
چکیده [English]

Accurate assessment of the seismic fragility of special reinforced concrete (RC) moment-resisting frames requires consideration of the factors influencing the nonlinear response of the structure. In the present study, a novel and unified framework for assessing the seismic fragility of such frames is developed, in which the effects of soil–foundation–structure interaction (SFSI), nonlinear beam-to-column joint behavior, span length, and the type and vertical location of structural irregularities are simultaneously considered. For this purpose, five-story structures were designed in accordance with the seismic provisions of the Iranian codes and ACI 318-19, and the finite-element models were developed using OpenSees. Seismic performance was evaluated through incremental dynamic analysis using a suite of far-field ground-motion records selected in accordance with FEMA P695. The maximum inter-story drift ratio was adopted as the engineering demand parameter, and the fragility curves were developed based on four seismic performance levels. The results showed that lateral stiffness irregularity in the first story had the most adverse effect on the seismic fragility of structures in both configurations. In addition, mass concentration at the first story in short-span frames and at the third story in long-span frames increased seismic vulnerability. Accordingly, it was observed that the effects of the type and location of irregularities depend on the geometric characteristics of the frame, and this dependency becomes more pronounced in the presence of SFSI and nonlinear beam-to-column joint behavior. Therefore, neglecting these factors in the seismic fragility assessment of special RC moment-resisting frames with various irregularity patterns may lead to inaccurate estimates of structural seismic vulnerability.

کلیدواژه‌ها [English]

  • Special Reinforced Concrete Moment-Resisting Frames
  • Beam-to-Column Joint
  • Soil-Foundation-Structure Interaction
  • Incremental Dynamic Analysis
  • Fragility Curve

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