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ضرورت مدلسازی چشمه اتصال تیر به ستون در سازههای بتنآرمه دارای زوال رفتاری | ||
| نشریه مهندسی عمران امیرکبیر | ||
| دوره 56، شماره 7، 1403، صفحه 845-864 اصل مقاله (2.06 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2024.22089.7900 | ||
| نویسندگان | ||
| احمدرضا فخریت؛ ساسان معتقد* ؛ محمدصادق شهیدزاده | ||
| گروه عمران، دانشکده مهندسی، دانشگاه صنعتی خاتم الانبیاء بهبهان، بهبهان، ایران | ||
| چکیده | ||
| چشمه اتصال هسته مرکزی قرار گرفته در محل اتصال تیر و ستون در قاب است. هدف این مقاله بررسی تأثیر مدلسازی چشمه اتصال در رفتار سازههای بتنی با قاب خمشی بر نتایج تحلیل است. به این منظور دو قاب خمشی بتنی 8 و 12 طبقه با استفاده از نرم افزار اپنسیس مدلسازی و پاسخهای تحلیلهای استاتیکی چرخهای غیر خطی، آنالیز دینامیکی غیر خطی و دینامیکی افزایشی غیر خطی در حالات با و بدون مدلسازی چشمه اتصال با یکدیگر مقایسه شده است. در همه حالات زوال رفتاری طبق مدل ایبارا، مدینا و کراوینکر مد نظر قرار گرفته است. نتایج نشان داد اختلاف در ارزیابی استاتیکی مدلها بسیار کم است و حضور و عدم حضور چشمه اتصال در آنالیز استاتیکی تأثیر قابل توجهی در نتایج ندارد. در آنالیز دینامیکی تأثیر چشمه اتصال قابل ملاحظه است. با بررسی منحنی شکنندگی سازه مشاهده شد که مدل با چشمه اتصال در سطوح شدت پایینتری به آستانه فرو ریزش میرسد. همچنین در تحلیل تاریخچه زمانی غیر خطی پاسخ سازه مشاهده شد زمانی که سازه در ناحیه خطی است و جابجاییهای سازه کم است اثر مدلسازی و عدم مدلسازی چشمه اتصال ناچیز است، اما با ورود سازه به ناحیه غیر خطی جابجایی نسبی در حضور چشمه اتصال بیشتر است. | ||
| کلیدواژهها | ||
| قاب خمشی بتنآرمه؛ مدل ایبارا-مدینا-کراوینکلر؛ تحلیل دینامیکی؛ چشمه اتصال؛ اپنسیس | ||
| موضوعات | ||
| اتصالات بتنی؛ رفتار لرزه ای سازه بتنی | ||
| عنوان مقاله [English] | ||
| The Necessity of Modeling the Column Beam Joint Panel Zone in Reinforced Concrete Structures with Behavioral Degradation | ||
| نویسندگان [English] | ||
| ahmadreza fakhriyat؛ Sasan Motaghed؛ Mohammad Sadegh Shahidzadeh | ||
| Department of Civil Engineering, Faculty of Engineering, Behbahan Khatam Alanbia University of Technology, | ||
| چکیده [English] | ||
| This study investigates the impact of incorporating panel zones into the numerical modelling of reinforced concrete moment-resisting frames (RC MRFs). Eight- and twelve-story RC MRF models were created using OpenSees software. The effects of panel zone inclusion were analyzed by comparing the results of nonlinear static (cyclic), dynamic, and incremental dynamic analyses. All models employed the Ibarra-Medina-Krawinkler (IMK) degradation model to account for material behaviour. The static analyses revealed minimal differences between models with and without panel zones. However, the influence of panel zones became significant in the dynamic analyses. Fragility curves demonstrated that models incorporating panel zones reached the collapse limit state at lower earthquake intensity levels. Additionally, the nonlinear time-history analysis showed that while panel zone effects were negligible in the linear response range, structures with modelled panel zones exhibited larger displacements upon entering the nonlinear region. These findings highlight the importance of considering panel zones in numerical models, particularly when evaluating the seismic performance of RC MRFs. Panel zones play a crucial role in capturing the inelastic response and collapse behaviour of structures under earthquake loading. | ||
| کلیدواژهها [English] | ||
| Moment Resistant Reinforced Concrete Bending Frame, Ibarra-Medina-Krawinkler Model, Dynamic Analysis, panel Zone, OpenSees Software | ||
| مراجع | ||
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