ارزیابی اجزای محدود پایه های پل بتن مسلح معمولی و تقویت شده با FRP تحت سناریوهای مختلف انفجار نزدیک

انصاری, مختار; صفائیان حمزه‌کلائی, ناصر

doi:10.22065/jsce.2024.432016.3305

ارزیابی اجزای محدود پایه های پل بتن مسلح معمولی و تقویت شده با FRP تحت سناریوهای مختلف انفجار نزدیک

نوع مقاله : علمی - پژوهشی

نویسندگان

مختار انصاری ¹

ناصر صفائیان حمزه‌کلائی ²

¹ استادیار، دانشکده مهندسی، دانشگاه بزرگمهر قائنات، قائن، ایران

² استادیار،دانشکده مهندسی، دانشگاه بزرگمهر قائنات، قاین، ایران

10.22065/jsce.2024.432016.3305

چکیده

امروزه برای اطمینان از سرویس‌رسانی پل در سطوح مختلف آسیب انفجار و بهبود عملکرد آنها از ورق‌های FRP استفاده می‌شود. در این تحقیق، عملکرد ستون پایه پل بتن‌مسلح معمولی و تقویت‌شده با پوشش FRP تحت سناریوهای مختلف انفجار سطحی از نوع نزدیک با نرم‌افزار آباکوس مورد بررسی قرار گرفته‌است. در این تحقیق ابتدا اثر شکل مقطع بر عملکرد پایه پل با در نظر گرفتن 4 مقطع مختلف (مستطیلی، مربعی، جعبه‌ای و دایره‌ای) با سطح مقطع و فولادگذاری یکسان بررسی شد. در تمامی مدل‌ها، ابتدا یک افزایش شدید در برش پایه سیستم در لحظه وقوع انفجار رخ داده و سپس نیروها به‌صورت نوسانی کاهش یافت؛ ولی پاسخ بیشینه مقطع مستطیلی در زمان کمتری پس از وقوع انفجار اتفاق افتاد. بررسی شاخص‌های عملکردی مختلف نظیر بیشینه مقدار تنش، تغییر مکان، برش پایه، جذب انرژی و میزان خرابی تحت سناریوهای مختلف انفجار نشان داد که مقطع مستطیلی و دایره‌ای به‌ترتیب بهترین عملکرد و بیشترین آسیب را داشته‌اند. پس از ارزیابی و انتخاب مقطع مستطیل به عنوان مرجع، اثر وزن ماده منفجره و فاصله منبع انفجار مورد بررسی قرار گرفت. با افزایش ‌TNT از 100 به 200 و 300 کیلوگرم، تغییرمکان بیشینه (به‌ترتیب %220 و %419)، جذب انرژی کرنش پلاستیک (%140 و %302) و همچنین شدت خرابی افزایش ولی ظرفیت برشی کاهش یافت. با این وجود، فاصله منبع انفجار اثر بیشتری بر عملکرد پایه پل داشته است. با افزایش فاصله انفجار از 1 به 3 و 5 متر، بیشینه تغییر مکان (%96 و %98)، ظرفیت برشی (53% و 61%) و جذب انرژی کرنش خمیری (%92 و 95%) کاهش یافت. اما با افزایش ‌TNT حتی در فاصله ایمن، شدت آسیب افزایش یافت. در انتها، مقاوم‌سازی ستون با تنها یک لایه پوشش FRP، ظرفیت باربری سیستم را تا اندازه 5/28 درصد افزایش داد و تغییر مکان بیشینه 30 درصد کاهش یافت.

کلیدواژه‌ها

پایه پل بتن مسلح

پوشش الیاف پلیمری

بار انفجار نزدیک

تحلیل اجزای محدود

نرم‌افزار آباکوس

موضوعات

مهندسی پل

عنوان مقاله English

Finite Element Analysis-Based Evaluation of Normal and FRP-Coated Concrete Bridge Piers Under Close-in Blast Loading Scenarios

نویسندگان English

Mokhtar Ansari ¹

Naser Safaeian Hamzehkolaei ²

¹ Assistant Professor,Faculty of Engineering, Bozorgmehr University of Qaenat. Qaen, Iran

² Assistant Professor. Faculty of engineering, Bozorgmehr University of Qaenat, Qaen, Iran

چکیده English

Nowadays, Fibre-reinforced polymer sheets are used to ensure the serviceability of the bridge at different levels of damage after the explosion and to improve their performance. In this study, the performance of the FRP-coated reinforced concrete bridge piers under various explosion scenarios was investigated using Abaqus software. The effect of section shape was examined by considering rectangular, square, box, and circular sections with equal cross-sectional area and reinforcement. All models exhibited a sharp increase in base shear at the beginning of the explosion, followed by a decrease in an oscillatory manner. However, the rectangular section showed the maximum response in a shorter time. The investigation of performance indicators such as maximum stress, displacement change, base shear, energy absorption, and damage level under different explosion scenarios showed that the rectangular and circular sections had the best performance and the most damage, respectively. The effect of TNT weight and blast distance was also examined. Increasing the TNT weight from 100 to 200 and 300 kg led to an increase in maximum displacement (220% and 419%, respectively), plastic strain energy absorption (140% and 302%), and damage intensity, while shear capacity decreased. However, the explosion distance had a more significant effect on structural performance. With an increase in the explosion distance from 1 to 3 and 5 meters, the maximum displacement, shear capacity, and strain energy absorption decreased by 96% and 98%, 53% and 61%, and 92% and 95%, respectively. For a specific TNT value at a safe distance, the column does not suffer noticeable damage. However, as the TNT weight increased, even at a safe distance, the severity of damage increased. Furthermore, column retrofitting with only one FRP layer increased the system's capacity by 28.5% while reducing the maximum displacement by 30%.

کلیدواژه‌ها English

Reinforced concrete bridge pier

Fiber-Reinforced Polymer

Close-in Blast-loading

Finite element analysis

software

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