مهندسی سازه و ساخت

مهندسی سازه و ساخت

مطالعه پارامتری رفتار چرخه ای دیوار برشی بتنی پس از آتش

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشیار، دانشکده ی مهندسی عمران و معماری، دانشگاه شهید چمران اهواز ، اهواز، ایران
2 استادیار، دانشکده ی مهندسی عمران و معماری، دانشگاه شهید چمران اهواز ، اهواز، ایران
3 فارغ التحصیل کارشناسی ارشد - مهندسی سازه، دانشکده ی مهندسی عمران و معماری، دانشگاه شهید چمران اهواز ، اهواز، ایران
چکیده
برای سازه‌های بتنی در معرض آتش‌سوزی و بار حرارتی نه تنها تحقیق در مورد ظرفیت تحمل باقیمانده آن‌ها لازم است، بلکه مواردی که روی عملکرد سیکلیک (چرخه‌ای) پس از آتش‌سوزی تمرکز دارند نیز از اهمیت بالایی برخوردار است. با توجه به این نکته، در تحقیق حاضر رفتار مکانیکی و سیکلیک دیوار برشی بتنی بعد از آتش‌سوزی با استفاده از روش عددی اجزای محدود و نرم‌افزار المان محدود آباکوس مورد مطالعه قرار گرفته است. از آنجا که طبق مطالعات مهمترین عامل در رفتار بتن در آتش‌سوزی زمان حرارت دهی می‌باشد، لذا این پارامتر به عنوان متغیر اصلی تحقیق در نظر گرفته شده‌ است. در مطالعه پارامتریک حاضر، متغیرهای ضخامت دیوار برشی (پارامتر هندسی) و نوع سنگدانه (پارامتر فنی) به عنوان عوامل موثر در رفتار بتن در آتش‌سوزی در نظر گرفته شده‌اند. در این راستا، 7 مدل مورد بررسی قرار گرفته‌اند. نتایج تحقیق نشان داد افزایش پارامتر مدت زمان آتش‌سوزی، شار حرارتی و دما در سطح دیوار بتنی و میلگردهای فولادی را افزایش می‌دهد. همچنین تنش تسلیم بتن و فولاد هر دو کاهش و کرنش تسلیم و نهایی آن‌ها افزایش می‌یابد. از دیگر نتایج تحقیق می‌توان به بدون تاثیر بودن افزایش ضخامت دیوار برشی بتنی بر انرژی حرارتی منتقل شده در واحد زمان و بر واحد سطح دیوار بتنی اشاره کرد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

A parametric study of the cyclic behavior of concrete shear wall after fire.

نویسندگان English

Abbas Rezaeian 1
Farhad Hosseinlou 2
Bijan Bahadori Birgani 3
1 Associate Professor, Faculty of Civil Engineering and Architecture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
2 Assistant Professor, Faculty of Civil Engineering and Architecture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
3 Master's degree in structural engineering, Faculty of Civil Engineering and Architecture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
چکیده English

For concrete structures exposed to fire and thermal load, in addition to researching their residual bearing capacity, it is also important to study their seismic performance after fire. Therefore, in the present research, the mechanical and cyclical behavior of concrete shear wall after fire has been studied using finite element method and ABAQUS software. Since, according to studies, the most important factor in the behavior of concrete in fire is the heating time, so this parameter is considered as the main variable of the research. In this parametric study, the variables of shear wall thickness (geometric parameter) and aggregate type (technical parameter) are considered as effective factors in the behavior of concrete in fire. In this regard, 7 models have been investigated. The results of the research showed that increasing the fire duration parameter increases the heat flux and temperature on the surface of the concrete wall and steel rebars. The results of the research show that the maximum von Mises stress of the concrete wall has increased by 22.7% and 44.446%, respectively, by increasing the duration of the fire from 0 to 90 and 150 minutes. Increasing the duration of fire reduces the yield strength and ultimate strength of steel bars by 17% and 15%, respectively. Yield strain, rupture strain and ultimate strain have also increased by 32.5%, 5.05% and 5.4%, respectively.

کلیدواژه‌ها English

Cyclic behavior
fire
concrete shear wall
thermal flux
parametric study
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  • تاریخ دریافت 21 آبان 1402
  • تاریخ بازنگری 16 خرداد 1403
  • تاریخ پذیرش 25 شهریور 1403