گسترش کاربرد اتصالات موجی برای جلوگیری از کمانش‌های موضعی لوله‌های مدفون گاز متقاطع با گسل‌های امتداد لغز

سیدکلبادی, سیدمحمد; حسنی, نعمت; صافی, محمد

doi:10.48301/kssa.2023.390046.2486

گسترش کاربرد اتصالات موجی برای جلوگیری از کمانش‌های موضعی لوله‌های مدفون گاز متقاطع با گسل‌های امتداد لغز

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان

سیدمحمد سیدکلبادی ¹

نعمت حسنی ²

محمد صافی ²

¹ دانش آموخته دکتری، گروه مهندسی سازه و زلزله، دانشکده مهندسی عمران و محیط زیست، دانشگاه شهید بهشتی، تهران، ایران و عضو هیات علمی، گروه مهندسی عمران، دانشگاه فنی و حرفه‌ای، تهران، ایران.

² دانشیار، گروه مهندسی سازه و زلزله، دانشکده مهندسی عمران و محیط زیست، دانشگاه شهید بهشتی، تهران، ایران.

10.48301/kssa.2023.390046.2486

چکیده

یکی از مهم‌ترین چالش‌های صنعت خطوط توزیع لوله‌های مدفون گاز، محافظت آنها در برابر حرکات زمین همچون جابجایی گسل می‌باشد. اتصالات موجی می‌توانند با تغییر شکل‌های دورانی، ناحیه آسیب دیده را محدود نمایند. در این مقاله گسترش کاربرد اتصالات موجی در لوله‌های گازی مدفون متقاطع با گسل با استفاده از مدل‌سازی عددی مورد بررسی قرار می‌گیرد. اتصالات موجی می‌تواند بدون افزایش شدید مقادیر کرنش پلاستیک در ناحیۀ بحرانی، منجر به تغییر شکل‌های بزرگ ناشی از نیروهای برشی، خمشی و محوری گردد. در مدل‌سازی‌های عددی، یکی از کمیت‌های تاثیرگذار بر پاسخ لوله، طول اندرکنشی لوله و خاک است. این طول وابسته به سختی نسبی لوله و خاک دارد به طوری که طول کم موجب نتایج دور از واقعیت و طول زیاد موجب افزایش هزینۀ مدل‌سازی خواهد شد. در این مقاله طول بهینۀ مدل‌سازی 3 برابر طول پیشنهاد شده در مطالعات گذشته به‌دست آمده است که منجر به تغییرات پاسخ لوله به میزان 20 درصد می‌شود. همچنین استفاده از اتصالات موجی علاوه بر کاهش ناحیۀ بحرانی ناشی از پدیدۀ کمانش، مقادیر کرنش را حدود 80 درصد کاهش می‌دهند.

کلیدواژه‌ها

لوله‌های مدفون فولادی

اتصالات موجی

گسل امتداد لغز

طول بهینه مدل‌سازی لوله و خاک

کمانش موضعی لوله

موضوعات

مهندسی عمران

عنوان مقاله English

Development Application of Wave Connection to Prevention of Local Buckling on Buried Gas Pipelines Due to Strike-slip Faulting

نویسندگان English

Seyed Mohamad Seyed Kolbadi ¹

Nemat Hassani ²

Mohamad Safi ²

¹ PhD, Department of Structure and Earthquake Engineering, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran. And Faculty member, Department of civil engineering, Technical and Vocational University, Tehran, Iran.

² Associate Professor, Department of Structure and Earthquake Engineering, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran.

چکیده English

One of the most challenging gas pipeline transition industries is preserving the pipeline due to the hazard of ground motions such as fault movements. Wave connection can create a rotational deflection by its deformation capacity to limit the failure area of the pipeline. In this research, the application of wave connection in cross-gas transmission pipes with faults was developed. Wave bonding with high ductility capacity shows the behaviour of the plastic joint with the difference that without a significant increase in plastic strain, it will be able to provide axial, shear and rotational displacements. One of the influential parameters in the response of buried pipes is the length of the modelled pipe and soil. This length depends on relative soil-pipe stiffness. In the present research, the length of the optimized model was considered to be more than 3 times the length of the model recommended in previous studies. The results showed that this change in length will change the tube response by approximately 20%. In addition, four-node shell elements and eight-node solid elements were intended for pipes and soil, respectively. One of the greatest damages to the pipe is local buckling. The results showed that the use of wave connection will result in the complete elimination of this damage and also an 80% reduction in strain values.

کلیدواژه‌ها English

Buried Steel Pipe Wave Connection Strike

slip Fault Optimal Pipe Length Local Buckling

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