ارزیابی لرزه ای پل های بتنی چند دهانه با پایه های ساخته شده از بتن فوق توانمند با استفاده از منحنی شکنندگی

نوع مقاله : مقاله پژوهشی

نویسندگان

• حامد قدیمی مقدم ¹
• فرشته امامی ²
• محمد رضا منصوری ¹

¹ گروه مهندسی عمران ، واحد علوم و تحقیقات ، دانشگاه آزاد اسلامی ،تهران،ایرا ن

² گروه مهندسی عمران، دانشکده عمران، معماری و هنر، واحد علوم تحقیقات، دانشگاه آزاد اسلامی، تهران ، ایران

10.22067/jfcei.2024.84877.1261

چکیده

پل‌ها نقش حیاتی در اتصال مسیرهای حمل‌ونقل، مدیریت ترافیک، و دسترسی به مکان‌های استراتژیک نظامی، سیاسی و اجتماعی ایفا می‌کنند که اهمیت آنها به‌ویژه در زمان بحران آشکار می‌شود. زمین‌لرزه‌ها جزء حوادث غیرقابل‌پیش‌بینی هستند که عملکرد شریان‌های حیاتی حمل‌ونقل را مختل می‌کنند و منجر به تخریب این سازه‌های مهم می‌شوند. استفاده از فناوری‌های نوآورانه، مانند بتن فوق توانمند، به‌عنوان یک راه امیدوارکننده برای افزایش انعطاف‌پذیری سازه و کاهش آسیب مطرح می‌شود. این بتن به‌واسطه طرح اختلاطی که دارد دارای ساختاری یکپارچه و همگن، نفوذپذیری پایین و دوام بالا است که می‌تواند موجب افزایش ظرفیت مقاومت پل در برابر نیروهای لرزه‌ای و محدودکردن انتشار آسیب شود. یکی از مؤثرترین روش‌ها برای ارزیابی آسیب‌پذیری لرزه‌ای پل‌ها، تحلیل شکنندگی است، روشی که با استفاده از شاخص‌های آسیب، سطوح آسیب را تحت اثر پارامترهای لرزه‌ای بیان می‌کند. این مطالعه عملکرد لرزه‌ای پل‌های شهری با سیستم تیر - دال بتنی با پایه‌هایی ساخته شده از بتن فوق توانمند با ارتفاع ۵ و ۸ متر را ارزیابی می کند؛که تجزیه‌وتحلیل آن با استفاده از نرم‌افزار CSI Bridge انجام شده و شتاب‌نگاشت‌های مناسبی از حوزه دور و نزدیک جهت تحلیل دینامیکی افزاینده (IDA) و محاسبه سطوح خسارت انتخاب گردید؛ نتایج بیان می‌کند احتمال فراگذشت آسیب در پایه‌های ساخته شده با بتن فوق توانمند نسبت به پایه‌های ساخته شده با بتن معمولی کمتر است. با بررسی سطوح شدت در میانه خسارت مشاهده می‌گردد که ظرفیت نهایی بتن فوق توانمند در سطح عملکرد فروریزش حداقل ۷ درصد و حداکثر ۲۶ درصد بهبود عملکرد نسبت به بتن معمولی داشته است.

کلیدواژه‌ها

• پل
• بتن فوق توانمند
• تحلیل دینامیکی افزاینده
• منحنی شکنندگی
• شاخص‌های آسیب

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عنوان مقاله [English]

Seismic Evaluation of Multi-Span Reinforced Concrete Bridges with Ultra High-Performance Concrete Piers Using Fragility Curves

نویسندگان [English]

• Hamed Ghadimi Moghadam ¹
• Fereshteh Emami ²
• Mohammad Reza Mansoori ¹

¹ Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

² Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

چکیده [English]

Bridges play a vital role in transportation, traffic management, and providing access to strategic locations, especially during crises. Earthquakes are unpredictable events that disrupt critical transportation routes and damage important structures. Innovative technologies, such as Ultra High-Performance Concrete (UHPC), offer hope for enhancing structural flexibility and reducing damage. UHPC, known for its uniformity, low permeability, and durability, increases the resistance of bridges to seismic forces and limits the spread of damage. One of the most effective methods for assessing seismic vulnerability is Fragility Analysis. This study evaluates urban bridges with UHPC concrete columns supporting cast-in-place concrete T-beam superstructures. The analysis was conducted using CSI Bridge software, and appropriate ground motion records were selected for Incremental Dynamic Analysis (IDA) and damage level calculations. The results indicate that the probability of damage exceeding a certain threshold in UHPC concrete piers is lower compared to those made of ordinary concrete. Examining damage intensity levels reveals that high-performance concrete improves performance by 7% in the worst-case scenario and up to 26% in the best-case scenario compared to ordinary concrete.

کلیدواژه‌ها [English]

• Bridge
• Ultra High-Performance Concrete
• Incremental Dynamic Analysis
• Fragility Curve
• Damage index

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