ارزیابی مدل قاب جایگزین جهت تعیین مؤلفه‌های نیرویی ستون‌های قاب خمشی بتنی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد سازه، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

2 دانشیار، دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران.

3 دانش آموخته دکتری سازه، دانشکده عمران، دانشگاه صنعتی شریف، تهران، ایران.

چکیده

امروزه تحلیل‌های دینامیکی غیرخطی در حوزه‌ی تحقیقات و طراحی مهندسی سازه و زلزله کاربرد فراوانی داشته و به طور گسترده در طراحی براساس عملکرد سازه‌ها، طراحی براساس تاب‌آوری، و همچنین سایر زمینه‌های احتمالاتی و بهینه‌سازی، مورد استفاده قرار می‌گیرد. از آنجایی که این تحلیل‌ها، هزینه‌ی محاسباتی بالایی را به محققان تحمیل می‌کند، در بسیاری از این تحلیل‌ها از مدل‌های ساده شده استفاده می‌شود. قاب جایگزین یک مدل ساده شده برای قاب‌های خمشی فولادی و بتنی است که از طرفی پاسخ‌های تغییرمکانی قاب را با دقت خیلی خوبی پیش‌بینی می‌کند و از طرف دیگر، زمان تحلیل را تا چند برابر کاهش می‌دهد. علی‌رغم ارزیابی‌های متعدد مدل قاب جایگزین در تحلیل‌های دینامیکی غیرخطی، تحلیل‌های دینامیکی فزاینده و تعیین منحنی‌های شکنندگی، دقت این مدل جهت پیش‌بینی پاسخ‌های نیرویی مورد بررسی قرار نگرفته است. از آنجایی که در ارزیابی عملکردی سازه‌ها، بررسی اعضای نیرو کنترل جهت جلوگیری از ایجاد مکانیزم نامطلوب شکست، از اهمیت ویژه‌ای برخوردار است. در این تحقیق ابتدا پاسخ‌های نیرویی ستون‌های قاب اصلی تحت رکورد زلزله با استفاده از یک روش تحلیلی از پاسخ‌های قاب جایگزین به دست آمد. سپس، دقت پاسخ‌های به دست آمده، مورد ارزیابی قرار گرفت. نتایج ارزیابی‌های انجام شده نشان داد که مدل قاب جایگزین لنگر خمشی، نیروی برشی، و نیروی محوری را به طور میانگین بین 0.8 تا 1.2 پاسخ ستون‌های قاب اصلی پیش‌بینی می‌کند که میزان پراکندگی پاسخ‌ها نیز برای رکوردهای مختلف کمتر از 0.2 است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Robustness Evaluation of Substitute Frame Model for Determination of Force Actions in Columns of RC Moment Frames

نویسندگان [English]

  • Sajedeh Abbasgholinia 1
  • Horr Khosravi 2
  • Shaghayegh Vaseghiamiri 3
1 MSc Student of Structural Engineering, Department of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
2 Associate Professor, Faculty of Civil Engineering, Noshirvani University of Technology, Babol, Iran.
3 PhD of structural engineering, Department of Civil Engineering, Sharif University of Technology, Tehran, Iran
چکیده [English]

Nowadays, extensive nonlinear dynamic analysis is widely used in different fields of research and design of structural and earthquake engineering. It has been applied in performance-based design, resilience-based design, and also other probabilistic fields and optimization. This extensive analysis imposes a high computational cost on the researcher. However, using simplified models is an appropriate approach. The Substitute Frame is a simplified model for steel and RC moment frames, which on the one hand predicts the displacement responses of the frame with very good accuracy and on the other hand, reduces the analysis time by several times. Despite numerous evaluations of the substitute frame model in nonlinear dynamic analyses, incremental dynamic analyses, and fragility analyses, the model's accuracy has not yet been investigated for predicting moment frames' force responses. In performance-based engineering, force-control actions should be designed to prevent the undesirable failure mechanism. Hence, in this study, first, the force response of the columns was predicted using the substitute frame model, and then its accuracy was evaluated comparing to the original frame response. The results of evaluations showed that the substitute frame predicts the columns bending moments, shear forces, and axial forces of the original frame with more than 90% accuracy.

کلیدواژه‌ها [English]

  • Substitute frame model
  • Simplified model
  • RC moment frames
  • Force-control elements
  • Columns force actions

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