اثر خوردگی آرماتورها بر رفتار چرخه ای پایه پل های بتن آرمه

احمدی, مسعود; عبادی جامخانه, مهدی; کماسی, مهدی

doi:10.22091/cer.2022.7589.1327

اثر خوردگی آرماتورها بر رفتار چرخه ای پایه پل های بتن آرمه

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشکده فنی مهندسی، دانشگاه آیت ا... بروجردی (ره)، بروجرد ایران.

² گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه دامغان

³ دانشکده فنی مهندسی، دانشگاه آیت الله بروجردی (ره)، بروجرد، ایران.

10.22091/cer.2022.7589.1327

چکیده

پل‌ها یکی از ارکان مهم در سیستم حمل و نقل بوده که می‌توانند تحث اثر محیط‌های مهاجم دچار زوال در عملکرد شوند. خوردگی آرماتورهای فولادی از جمله عوامل اصلی زوال عملکرد در پل‌های بتن آرمه است. تغییرات آب و هوایی خوردگی آرماتورها را تشدید کرده و قابل انتظار است که خرابی‌های بیشتری در یک بازه زمانی کوتاه ایجاد کنند. پل‌ها با اثر خوردگی آرماتورها که در مناطق لرزه‌خیزی بالا واقع شده اند، احتمالاً آسیب‌پذیری بالاتری را در طول زمان بهره‌برداری خود خواهند داشت. از اینرو بایستی عملکرد لرزه‌ای آنها به دقت مورد ارزیابی قرار گیرد. در این مطالعه، یک تحلیل المان محدود غیرخطی سه‌بعدی کارآمد بر اساس روش دینامیکی صریح برای بررسی رفتار پایه‌های پل سالم (بدون خوردگی) و دارای خوردگی بکار گرفته شده است. در تحلیل های انجام شده، تأثیر سطوح 10%، 20% و 30% خوردگی بر رفتار چرخه‌ای پایه‌های پل مورد بررسی قرار گرفته است. پارامترهای در نظر گرفته شده در این مدل‌های عددی شامل کاهش تنش پیوستگی و خصوصیات مکانیکی اصلاح شده برای بتن و فولاد (کشش و فشار) تحت اثر بارگذاری چرخه‌ای می‌باشد. مدل عددی استفاده شده از طریق مقایسه با نتایج آزمایشگاهی راستی آزمایی شده است. نتایج نشان داد که رویکرد مورد استفاده تخمین مناسبی از عملکرد پایه‌ پل‌ها تحت اثر بارهای چرخه‌ای ارائه می‌کند. همچنین کمک می‌کند تا بتوان با بررسی پل‌های موجود مواردی که اولویت بیشتری برای مقاوم سازی دارند را شناسایی کرد.

کلیدواژه‌ها

20.1001.1.2783140.1401.8.1.5.8

موضوعات

عنوان مقاله [English]

Effect of Steel Reinforcement Corrosion on Cyclic Behavior of Bridge Piers

نویسندگان [English]

Masoud Ahmadi ¹
Mehdi Ebadi-Jamkhaneh ²
Mehdi Komasi ³

¹ Department of Civil Engineering, Ayatollah Boroujerdi University, Boroujerd, Iran

² Department of Civil Engineering, School of Engineering, Damghan University.

³ Department of Civil Engineering, Ayatollah Boroujerdi University, Boroujerd

چکیده [English]

Bridges in transportation networks are susceptible to damage from the aggressive environment. Steel reinforcement corrosion is one of the main causes of deficient behavior in the reinforced concrete (RC) bridge. The corrosion of steel rebar negatively affects the serviceability and seismic performance of many RC bridges. Climate change accelerates steel reinforcement corrosion and more severe damage is expected to occur in a short period of time in the future. When these bridges are located in high seismic regions, they may experience severe earthquake events along their service life. Therefore, their seismic performance must be carefully evaluated. In this study, an efficient three-dimensional nonlinear finite element analysis based on the explicit dynamic method for sound and corroded bridge piers was established to study the effect of corrosion levels of 10, 20, and 30% on the cyclic behavior of bridge piers. The used model considers the loss of bond strength and damaged material properties of concrete and steel for compression and tension response under cyclic loading. The model is validated through a comparison with the results of the experimental test. The results revealed that the proposed method provides a good estimate of the load-carrying capacity of bridge piers. Furthermore, the used nonlinear finite element model will help identify the bridges with the highest priority for retrofitting by examining all existing bridges.

کلیدواژه‌ها [English]

Corrosion
Bridge Pier
Cyclic Loading
Ductility
Energy Dissipation

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