پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

اثر تعامل دینامیکی خاک و شمع بر پل‌های دارای عرشه دال-تیر با استفاده از روش اجزای محدود

نوع مقاله : مقاله پژوهشی

نویسنده
دانشکده فنی مهندسی، دانشگاه آزاد اسلامی واحد اصفهان، اصفهان، ایران
چکیده
درک دقیق رفتار سازه‌ها در هنگام زلزله همواره یکی از چالش‌های مهندسان بوده است. افزایش آگاهی در این زمینه می‌تواند به بهبود مقررات و طراحی‌های ایمن‌تر منجر شود. یکی از مهم‌ترین گام‌ها در درک این رفتار، فهم رفتار خاک و سازه در هنگام زلزله است. خاک به دلیل رفتار غیرخطی خود، پاسخ لرزه‌ای سازه را تغییر داده و حرکت خاک تحت تأثیر وجود سازه قرار می‌گیرد. تأثیر پاسخ سازه بر رفتار غیرخطی خاک و به‌طور متقابل، نوع پاسخ و رفتار لایه خاک زیربنایی در حضور سازه، پدیده‌ای به نام تعامل خاک-سازه را شکل می‌دهد. اثرات تعامل خاک-سازه و اهمیت تغییرات در پاسخ لرزه‌ای سازه از طریق تحلیل این مجموعه رفتاری عموماً قابل چشم‌پوشی نیست. این اثرات ممکن است باعث افزایش یا کاهش پاسخ لرزه‌ای سازه یا دیگر پارامترهای لرزه‌ای ناشی از نیروی زلزله شوند. همچنین این امکان وجود دارد که با وقوع این تغییرات، توزیع نیرو در اعضای سیستم مقاومت جانبی نیز تغییر کرده (کاهش یا افزایش یابد) و بر ایمنی، کارایی یا دوام آنها تأثیر بگذارد. در این مطالعه، اثر تعامل دینامیکی خاک و شمع بر پل‌های دارای عرشه دال-تیر با استفاده از روش اجزای محدود مورد بررسی قرار گرفته است. برای این منظور، با استفاده از نرم‌افزار اجزای محدود آباکوس، یک پل با عرشه دال بتن‌آرمه و فونداسیون عمیق، با در نظر گرفتن و بدون در نظر گرفتن اثرات تعامل بررسی شده است. در این پژوهش، تنش‌ها، کرنش‌ها، جابجایی‌ها و شتاب‌های عرشه پل مطالعه شدند. نتایج نشان داد که در نظر گرفتن تعامل خاک و شمع (PI)، تنش ماکزیمم مجموعه پل در مدل مورد مطالعه را افزایش داده است. با این حال، بررسی‌های دقیق‌تر نشان داد که تعامل خاک و سازه باعث کاهش تنش در عرشه و فونداسیون پل و افزایش میزان تنش در پشت شمع و گروه شمع‌ها می‌شود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

The Effect of Dynamic Soil-Pile Interaction on Bridges with Slab-Girder Decks Using the Finite Element Method

نویسنده English

Moein Zargar
Islamic Azad University Isfahan Branch, Isfahan, Iran
چکیده English

Understanding the precise behavior of structures during earthquakes has always been a challenge for engineers. Increasing awareness in this field can lead to improved regulations and safer designs. One of the most critical steps in comprehending this behavior is understanding the response of soil and structures during seismic events. Due to its nonlinear behavior, soil alters the seismic response of structures, while the presence of a structure influences soil movement. The interaction between the structural response and the nonlinear behavior of the underlying soil forms a phenomenon known as soil-structure interaction (SSI). The effects of SSI and the significance of its impact on the seismic response of structures are generally not negligible. These effects may either amplify or reduce the seismic response of structures and other earthquake-induced parameters. Additionally, changes in force distribution within the lateral resistance system may occur, potentially affecting the safety, efficiency, or durability of structural elements. In this study, the dynamic interaction between soil and piles in slab-girder deck bridges is investigated using the finite element method. To this end, a bridge with a reinforced concrete slab deck and deep foundation is analyzed using the ABAQUS finite element software, considering and neglecting soil-structure interaction effects. The research examines the stresses, strains, displacements, and accelerations of the bridge deck. The results indicate that considering pile-soil interaction (PI) increases the maximum stress in the bridge system. However, a more detailed analysis reveals that SSI reduces stress in the bridge deck and foundation while increasing stress behind the piles and within the pile group.

کلیدواژه‌ها English

Soil-Structure Interaction (SSI)­
؛ ؛ ؛ ؛ ؛ ؛ , Seismic Response­
؛ ؛ ؛ ؛ ؛ ؛ , Finite Element Analysis (FEA)
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