نشریه علمی سازه و فولاد

نشریه علمی سازه و فولاد

نقش مقاوم‌سازی در بهبود تاب‌آوری لرزه‌ای مخازن فولادی روزمینی ذخیره مایعات

نوع مقاله : مقاله پژوهشی

نویسندگان
گروه مهندسی عمران ، واحد قزوین ، دانشگاه آزاد اسلامی، قزوین، ایران
چکیده
زمینۀ پژوهش: مخازن فولادی زمینی ازجمله زیرساخت‌های حیاتی در صنایع نفت، گاز و پتروشیمی هستند که تداوم بهره‌برداری ایمن از آن‌ها پس از زلزله، از منظر اقتصادی، زیست‌محیطی و ایمنی، اهمیت ویژه‌ای دارد. یکی از عوامل اصلی مؤثر بر آسیب‌پذیری لرزه‌ای این مخازن، نحوۀ اتصال آن‌ها به پی و امکان وقوع بلندشدگی در ناحیۀ پایه است. در مخازن مهارنشده، بلندشدگی پایه می‌تواند موجب تمرکز تنش، بروز تغییرشکل‌های نامطلوب، کمانش موضعی جداره و کف، کاهش ظرفیت بهره‌برداری و حتی نشت مواد خطرناک شود. از این‌رو، ارزیابی راهکارهای مؤثر برای کنترل این پدیده و ارتقای تاب‌آوری لرزه‌ای مخازن، از مباحث مهم در طراحی عملکردمحور به‎شمار می‌آید. هدف این پژوهش، بررسی اثر سیستم مهار مکانیکی بر بهبود رفتار لرزه‌ای و افزایش تاب‌آوری مخازن فولادی زمینی و مقایسۀ عملکرد آن با مخازن مهارنشده در سطوح مختلف خطر لرزه‌ای است.
روش پژوهش: در این پژوهش، رفتار لرزه‌ای یک مخزن فولادی زمینی مجهز به سیستم مهار مکانیکی مطالعه و با نمونۀ مشابه مهارنشده مقایسه شد. ارزیابی عملکرد با انجام تحلیل‌های لرزه‌ای در سطوح مختلف خطر صورت گرفت تا میزان تأثیر سیستم مهار بر پاسخ سازه، سطح آسیب‌پذیری و قابلیت حفظ یا بازیابی عملکرد مشخص شود. به این منظور، سه سطح خطر متناظر با دوره‌های بازگشت ۷۵، ۴۷۵ و ۹۷۵ ساله در نظر گرفته شد. معیارهای اصلی ارزیابی شامل حفظ بازده عملکردی، شدت آسیب‌های سازه‌ای، پایداری عملیاتی و امکان بازگشت مخزن به شرایط بهره‌برداری پس از زلزله بود.
یافته‌ها: نتایج نشان داد در سطح خطر با دوره بازگشت ۷۵ ساله، تفاوت معناداری میان عملکرد مخازن مهارشده و مهارنشده مشاهده نمی‌شود و هر دو سامانه رفتار قابل‎قبولی دارند. بااین‎حال، در سطح طراحی پایه با دوره بازگشت ۴۷۵ ساله، مخازن مهارنشده با اُفت عملکردی در حدود ۴ تا ۶ درصد مواجه شدند، درحالی‎که مخازن مجهز به مهار مکانیکی پایداری عملیاتی خود را حفظ نمودند. همچنین در سطح خطر ۹۷۵ ساله، مخازن مهارنشده دچار آسیب‌های شدید سازه‌ای و خساراتی شدند که بازسازی آن‌ها ازنظر اقتصادی نامطلوب ارزیابی شد؛ در مقابل، مخازن مهارشده تنها وارد مرحلۀ بازیابی شدند و پس از انجام تعمیرات، قابلیت بازگشت به عملکرد اولیه را حفظ کردند.
نتیجه‌گیری: بر اساس نتایج این پژوهش، استفاده از سیستم مهار مکانیکی با کاهش بلندشدگی پایه و محدودنمودن آسیب‌های موضعی جداره، موجب بهبود عملکرد لرزه‌ای و ارتقای تاب‌آوری مخازن فولادی زمینی می‌شود. از این‌رو، به‌کارگیری این سیستم می‌تواند به‌عنوان راهکاری مؤثر در طراحی و بهسازی لرزه‌ای مخازن، به‌ویژه در مناطق با خطر لرزه‌ای متوسط و زیاد، مورد توجه قرار گیرد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

The Role of Retrofitting in Improving the Seismic Resilience of Aboveground Steel Liquid Storage Tanks

نویسندگان English

Amirhoessin Jamlapour
mehran Seyed Razzaghi
Masood Yakhchalian
Ph.D. Student, Department of Civil Engineering, Qa .c., Isalamic Azad university, Qazvin, Iran
چکیده English

Background: Aboveground steel storage tanks are critical infrastructure in the oil, gas, and petrochemical industries, and maintaining their safe operation following an earthquake is of particular importance from economic, environmental, and safety perspectives. One of the main factors contributing to the seismic vulnerability of these tanks is their connection to the foundation and the potential for base uplift. In unanchored tanks, base uplift can lead to stress concentration, undesirable deformations, local buckling of the shell and bottom plate, reduced operational capacity, and even leakage of hazardous materials. Therefore, evaluating effective measures to control this phenomenon and improve the seismic resilience of storage tanks is an important aspect of performance-based design. This study investigates the effect of a mechanical anchorage system on the seismic performance and resilience of aboveground steel storage tanks and compares its effectiveness with that of an unanchored tank under different seismic hazard levels.
Methods: The seismic behavior of an aboveground steel storage tank equipped with a mechanical anchorage system was investigated and compared with that of a similar unanchored tank. Performance was evaluated through seismic analyses at different hazard levels to assess the effects of anchorage on structural response, vulnerability, and the ability to maintain or recover operational performance. Three hazard levels corresponding to return periods of 75, 475, and 975 years were considered. The main evaluation criteria included functional performance, structural damage severity, operational stability, and the ability of the tank to return to its operational condition following an earthquake.
Results: The results showed that at the 75-year hazard level, no significant difference was observed between the anchored and unanchored tanks, and both configurations exhibited acceptable performance. At the 475-year design-level hazard, the unanchored tank experienced an approximately 4%–6% reduction in functional performance, whereas the mechanically anchored tank maintained operational stability. At the 975-year hazard level, the unanchored tank suffered severe structural damage, making repair economically impractical. In contrast, the anchored tank remained in a recoverable state and was able to recover its initial operational performance after repair.
Conclusion: The results indicate that the use of a mechanical anchorage system improves the seismic performance and resilience of aboveground steel storage tanks by reducing base uplift and limiting local shell damage. Therefore, mechanical anchorage can be considered an effective strategy for the seismic design and retrofit of storage tanks, particularly in areas with moderate to high seismic hazard

کلیدواژه‌ها English

Seismic Resilience
Ground-Supported Steel Tanks
Anchorage Condition
Nonlinear Seismic Response
Damage Assessment
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دوره 20، شماره 52 - شماره پیاپی 53
در حال انجام
تابستان 1405
صفحه 34-56

  • تاریخ دریافت 25 خرداد 1405
  • تاریخ بازنگری 29 تیر 1405
  • تاریخ پذیرش 01 مرداد 1405
  • تاریخ اولین انتشار 01 مرداد 1405
  • تاریخ انتشار 01 تیر 1405