پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

ارزیابی پارامترهای مؤثر بر پاسخ لرزه‌ای پل‌های راه‌آهن با عرشه جعبه‌ای بتن مسلح

نوع مقاله : مقاله پژوهشی

نویسنده
دانشکده فنی مهندسی، دانشگاه آزاد اسلامی واحد اصفهان، اصفهان، ایران
چکیده
با بررسی آمارهای اداره کل راه‌آهن و سازه‌های فنی راه‌آهن، می‌توان گفت تا پایان سال ۱۳۹۷، تعداد ۲۸۹۸۴ پل در شبکه ریلی کشور وجود داشت که از این تعداد، ۲۲۳ پل از نوع جعبه‌ای بتنی بودند. به دلیل مزایای این پل‌ها، امکان استفاده از این نوع پل در پروژه‌های بیشتری وجود دارد. افزایش استفاده از پل‌های جعبه‌ای بتنی نیازمند تحقیقات بیشتر و در نظر گرفتن تمامی جنبه‌های طراحی و اجرای چنین پل‌هایی است. در این مطالعه، مدل‌سازی دینامیکی پل‌های راه‌آهن با عرشه جعبه‌ای بتن مسلح مورد بررسی قرار گرفته است. برای این منظور، سه پل با ارتفاع پایه‌های مختلف و همچنین سه پل با تعداد دهانه‌های مختلف انتخاب شده‌اند. سپس، اجزای محدود مراحل مذکور در نرم‌افزار آباکوس مدل‌سازی شده‌اند. برای شبیه‌سازی شرایط بارگذاری زلزله، از شتاب‌نگاری لرزه‌ای ال سنترو استفاده شده است. همچنین، بارگذاری استاندارد مجله شماره ۱۳۹ سازمان مدیریت و برنامه‌ریزی ایران (قوانین بارگذاری پل‌ها) برای اعمال بار قطار استفاده شده است. در نهایت، تأثیر ارتفاع پایه‌های پل و همچنین تعداد دهانه‌ها بر جابجایی نسبی و دوره سازه مورد مطالعه با استفاده از روش اجزای محدود و نرم‌افزار آباکوس بررسی شد. نتایج نشان می‌دهند که افزایش تعداد دهانه‌ها نرخ حداکثر جابجایی پل‌ها را افزایش می‌دهد. همچنین، با افزایش تعداد دهانه‌ها در تمامی حالت‌های ارتعاشی، دوره سازه افزایش می‌یابد. از سوی دیگر، افزایش ارتفاع پایه‌ها میزان جابجایی پل را افزایش می‌دهد و همچنین با افزایش ارتفاع پایه‌های پل، دوره پل افزایش می‌یابد.
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

Examining the statistics of the General Directorate of Railways and Technical Structures of the Railway, it can be said that by the end of 1397, there were 28984 bridges in the country's railway network, of which 223 bridges were made of concrete boxes. Due to the advantages of these bridges, it is possible to use this type of bridge in more projects. Increasing the use of concrete box bridges requires more research and considering all aspects of design and implementation of such bridges. In this study, the dynamic modeling of railway bridges with reinforced concrete box deck has been discussed. For this purpose, three bridges with different base heights and also three bridges with different number of openings have been selected. Then, the limited components of the mentioned steps in Abacus software are modeled. In order to simulate the conditions of earthquake loading, El Centro seismic mapping acceleration has been used. Also, the standard loading of the magazine No. 139 of the Management and Planning Organization of the IRAN (the rules of loading the bridges) has been used in order to apply the train load. Finally, the effect of the height of the bridge pedestals as well as the number of openings on the relative displacement and period of the study structure was investigated using finite element method and Abacus software. The results show that increasing the number of openings will increase the maximum displacement rate of bridges. Also, with increasing number of openings in all vibration modes, the structural period increases. On the other hand, increasing the height of the pedestals increases the amount of displacement of the bridge, in addition as the height of the bridge pedestals increases, the amount of the bridge period increase.

کلیدواژه‌ها English

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