مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی آزمایشگاهی و عددی شکست لوله GRP مدفون در خاک‌‌های ماسه‌ای متراکم و غیر متراکم

نوع مقاله : علمی - پژوهشی

نویسندگان
محمد رئوف علی پوریانی 1
مهرزاد تحملی رودسری 2
الله رضا مرادی گروسی 3
محمدرضا قطب 4
1 دانشجوی دکتری، دانشکده فنی و مهندسی، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران.
2 دانشیار، دانشکده فنی و مهندسی، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران.
3 استادیار، دانشکده فنی و مهندسی، گروه مهندسی عمران، واحد سنندج، دانشگاه آزاد اسلامی، سنندج، ایران.
4 استادیار، دانشکده فنی و مهندسی، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران
10.22065/jsce.2025.487227.3564
چکیده
خطوط لوله‌ی زیرزمینی به‌عنوان زیرساخت‌های حیاتی شناخته می‌شوند و عمدتاً در انتقال انرژی و سایر سیالات مورداستفاده قرار می‌گیرند. یکی از بزرگ‌ترین تهدیدات ناشی از زلزله برای این خطوط لوله، پدیده‌ی جابجایی گسل‌هایی است که در مسیر آن‌ها قرار دارند. به همین دلیل، بررسی رفتار این خطوط لوله در خاک‌های مختلف تحت تأثیر زلزله از اهمیت ویژه‌ای برخوردار است. در مطالعه‌ی حاضر، رفتار لوله‌های مدفون از جنس GRP در خاک‌های ماسه‌ای متراکم و غیرمتراکم، به‌صورت آزمایشگاهی و عددی موردبررسی قرار گرفت. آزمایش‌ها در مقیاس کامل انجام شد و قطر و ضخامت لوله در دو مدل ثابت و به ترتیب برابر با ۲۰۰ و 9/4 میلی‌متر بود. پس از بارگذاری، تغییر مکان لوله در طول بارگذاری و لحظه‌ی شکست، همچنین نیروی وارده به آن محاسبه شد. سپس، مطالعات عددی بر اساس مدل صحت‌سنجی به‌منظور بررسی تأثیر قطر و ضخامت لوله بر این نتایج انجام گرفت. برای محاسبه‌ی ساده‌تر شکست لوله، بر اساس نتایج عددی، یک معادله‌ پیشنهاد شد. نهایتا شدت اثرگذاری متغیرهای لوله بر نتایج آن ارزیابی شد. نتایج این مطالعه نشان داد که افزایش قطر و ضخامت لوله موجب افزایش جابجایی موردنیاز در لحظه‌ی شکست و نیروی شکست می‌شود. لحظه شکست لوله بر اساس کرنش آن محاسبه گردید و مقدار آن در ماسه‌ی متراکم و غیرمتراکم تقریباً برابر با 5/1٪ به دست آمد. تأثیرگذارترین متغیر لوله بر نیروی شکست و جابجایی مطلق حداکثر آن، قطر لوله بود. تأثیر ضخامت لوله بر جابجایی حداکثر آن در خاک‌های ماسه‌ای غیرمتراکم بیشتر از خاک‌های متراکم است.
کلیدواژه‌ها
لوله‌ GRP
شریان‌های حیاتی
تحلیل آزمایشگاهی و عددی
ماسه متراکم و غیرمتراکم
اندرکنش خاک و لوله

موضوعات

عنوان مقاله English

Experimental and Numerical Investigation of GRP Pipe Failure Buried in Dense and Loose Sandy Soils

نویسندگان English

Mohammad Rauf AliPouriani 1
Mehrzad TahamouliRoudsari 2
AllahReza MoradiGaroosi 3
Mohammad Reza Ghotb 4
1 Department of Civil Engineering, College of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.
2 Department of Civil Engineering, College of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
3 Department of Civil Engineering, College of Engineering, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran.
4 Department of Civil Engineering, College of Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
چکیده English

Underground pipelines are considered critical infrastructure, primarily used for the transport of energy and other fluids. One of the major earthquake-related threats to these pipelines is fault displacement occurring along their paths. Therefore, examining the behavior of these pipelines in various soils under seismic impact is of paramount importance. This study investigates the behavior of buried GRP pipes in dense and loose sandy soils through experimental and numerical approaches. Full-scale tests were conducted, with a constant pipe diameter and thickness of 200 mm and 4.9 mm, respectively, across two models. Following loading, the pipe's displacement during loading and failure, as well as the applied force, were measured. Subsequently, numerical studies based on a validated model were carried out to assess the impact of pipe diameter and thickness on the results. A simplified failure equation was proposed based on numerical results to facilitate easier calculations. Finally, the influence of pipe variables on the outcomes was evaluated. Findings indicate that increasing the pipe's diameter and thickness led to higher displacement at the moment of failure and increased failure force. The pipe's failure moment was calculated based on strain, yielding a value of approximately 1.5% in both dense and loose sand. The most influential variable on the failure force and maximum absolute displacement was the pipe diameter. The effect of pipe thickness on maximum displacement was found to be more significant in loose sandy soils than in dense sands.

کلیدواژه‌ها English

GRP pipes
Lifelines
Experimental and Numerical analysis
Dense and loose sand
Soil-pipe interaction
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  • تاریخ دریافت 24 آبان 1403
  • تاریخ بازنگری 23 آذر 1403
  • تاریخ پذیرش 17 دی 1403