مهندسی سازه و ساخت

مهندسی سازه و ساخت

ارزیابی لرزه‌ای خط لوله گاز فرا ساحل در ساحل خلیج‌فارسی و تحلیل قابلیت اعتماد آن با لحاظ نمودن اندرکنش خاک و لوله

نوع مقاله : علمی - پژوهشی

نویسندگان
1 فارغ التحصیل مقطع کارشناسی ارشد مهندسی عمران-سازه، دانشکده فنی و مهندسی، دانشگاه شهید مدنی آذربایجان، تبریز، ایران.
2 استادیار گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه شهید مدنی آذربایجان، تبریز، ایران.
3 دانشیار گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه شهید مدنی آذربایجانتبریز، ایران.
چکیده
در سال‌های اخیر استفاده از لوله‌های فراساحل در خلیج‌فارس افزایش زیادی داشته است. این افزایش، نیاز رو به رشد برای انرژی و پیشرفت در ساخت و استفاده از منابع نفت و گاز در دریاها می‌باشد. با افزایش استفاده از لوله‌های فراساحل، ضرورت بررسی ایمنی و احتمال خرابی این لوله‌ها هنگام وقوع زلزله بیش از پیش گردیده است. در این پژوهش، مدل‌سازی عددی خطوط لوله گاز فراساحلی غیر مدفون با استفاده از نرم‌افزار SAP2000 V.14 مورد توجه قرار گرفته است و اثر انتشار موج لرزه‌ای و پاسخ‌های لوله‌های دریایی بر روی بافت‌های مختلف خاک به دو حالت خوابیده روی بستر دریا و دهانه آزاد مورد بحث و بررسی قرار گرفته است. تحلیل قابلیت اعتماد لرزه‌ای خط لوله با استفاده از نرم‌افزار OpenSees جهت یافتن شاخص قابلیت اعتماد (β) و احتمال خرابی سالانه خط لوله دریایی بر اساس روش‌های تحلیل قابلیت اعتماد FORM، SORM و FOSM برای حالات حدی مختلف لرزه‌ای به ترتیب زلزله سطح طراحی (DEQ)، زلزله سطح بهره‌برداری (SEQ)، زلزله سطح حداکثر (MEQ) و بیشینه زلزله محتمل (MPE) انجام و بررسی شده است. نتایج نشان داد در حالت دهانه آزاد به علت آزاد بودن دهانه لوله به طول 80 متر، جابجایی ناشی از حرکات لرزه‌ای زمین حداکثر است. بیشینه جابجایی‌های لرزه‌ای خط لوله در حالت دهانه آزاد در مقایسه با حالت خوابیده خط لوله بر روی بستر دریا، در حدود 4 برابر می‌باشد. به لحاظ طراحی خط لوله دریایی با دهانه آزاد با حالت انتهایی ثابت، وقتی از لحاظ بهره‌برداری قابل اعتماد می‌باشد که احتمال خرابی سالانه لوله دریایی مربوط به شرایط سرویس کوچک‌تر یا مساوی 01/0 و شاخص قابلیت اعتماد لرزه‌ای β بزرگ‌تر یا مساوی 2 باشد.

تحلیل قابلیت اعتماد نشان می‌دهد خطر خرابی سالانه خطوط لوله دریایی قابل کنترل است و با انتخاب مناسب روش تحلیل قابلیت اعتماد، می‌توان به طراحی ایمن خطوط لوله گاز فراساحلی کمک کرد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Seismic assessment of an offshore gas pipeline along the Persian Gulf coastline and analysis of its reliability, considering soil-pipe interaction

نویسندگان English

Maasoumeh Kokama 1
Mohammad Reza Emami Azadi 2
Nazila Kardan 3
1 Graduated MsC Student in Civil Engineering-Structure, Department of Civil Engineering, Faculty of Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran.
2 Assistant Professor, Department of civil Engineering, Faculty of Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran
3 Associate Professor, Department of Civil Engineering, Faculty of Engineering, Azarbaijan Shahid Madani Universiy, Tabriz, Iran.
چکیده English

In recent years, the use of offshore pipelines in the Persian Gulf has increased greatly. With the increase in the use of offshore pipes, the need to check the safety and the possibility of damage of these pipes during an earthquake has increased. In this research, numerical modeling of non-buried offshore gas pipelines using SAP2000 V.14 software is considered and the effect of seismic wave propagation and responses of offshore pipelines with free and fixed end conditions on different soil textures. It has been discussed and investigated in two ways lying on the sea bed and open mouth. Seismic reliability analysis of the pipeline using OpenSees software to find the reliability index (β) and the annual failure probability of the marine pipeline based on the FORM, SORM and FOSM reliability analysis methods for different seismic limit states respectively. Design level earthquake (DEQ), operational level earthquake (SEQ), maximum level earthquake (MEQ) and maximum probable earthquake (MPE) have been conducted and investigated. The results showed that in the case of free opening due to the free opening of the pipe with a length of 80 meters, the displacement caused by the seismic movements of the earth is maximum. The maximum seismic displacements of the pipeline in the state of open mouth are about 4 times compared to the state of the pipeline lying on the sea bed. In terms of the design of a marine pipeline with a free opening with a fixed end state, it is reliable in terms of operation when the annual probability of marine pipeline failure related to service conditions is less than or equal to 0.01 and the seismic reliability index β is greater or be equal to 2.

The findings can be instrumental in improving the safety and reliability of offshore pipelines.

کلیدواژه‌ها English

Sea pipeline
Seismic Reliability Analysis
Persian Gulf
Seismic load
Opensees
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  • تاریخ دریافت 06 آذر 1402
  • تاریخ بازنگری 03 بهمن 1402
  • تاریخ پذیرش 30 فروردین 1403