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ارزیابی میزان خرابی پل بتنی با پایههای فولادی تحت اثر بارهای انفجاری | ||
| مدل سازی در مهندسی | ||
| دوره 22، شماره 78، آبان 1403، صفحه 297-316 اصل مقاله (1.5 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22075/jme.2024.28278.2328 | ||
| نویسندگان | ||
| سهراب میراثی* 1؛ محمد مومنی2؛ احمد حسینی موردراز3 | ||
| 1استادیار، دانشکده مهندسی عمران، واحد شهرکرد، دانشگاه آزاد اسلامی، شهرکرد، ایران | ||
| 2استادیار، گروه مهندسی عمران، دانشکده مهندسی، دانشگاه فسا، فسا، ایران | ||
| 3دانشجوی کارشناسی ارشد، دانشکده مهندسی عمران، واحد بوشهر، دانشگاه آزاد اسلامی، بوشهر، ایران | ||
| تاریخ دریافت: 12 شهریور 1401، تاریخ بازنگری: 19 بهمن 1402، تاریخ پذیرش: 28 بهمن 1402 | ||
| چکیده | ||
| زیربنای سیستم حملونقل در هر کشوری شامل راهها، بزرگراهها و پلها میباشد که از این بین پلها از اهمیت بسیار بالائی برخوردارند. هر سازه در طول عمر مفید خود تحت اثر بارگذاریهای متنوعی قرار میگیرد که میزان خطرپذیری آن در برابر بارهای وارده، بر طراحی و مقاومسازی آن تأثیرگذار است. تعیین رفتار پلهایی که در گذشته و بر اساس آئیننامههای قدیم طراحی و اجرا شدهاند و امروزه نیز بهعنوان راههای دسترسی از آنها استفاده میشوند بسیار حائز اهمیت است و باید مورد ارزیابی و قضاوت قرار گیرند. از نمونه این پلهای قدیمی میتوان به پلهایی اشاره کرد که دارای پایههای فولادی هستند که با توجه به گذشت زمان، ارزیابی رفتار و میزان خرابی آنها در برابر بارهای ورودی از جمله بارهای انفجاری بیشازپیش احساس میگردد تا در صورت نیاز راهکارهایی برای ایمنسازی و مقاومسازی آنها ارائه گردد. در این مقاله با استفاده از تحلیل اجزای محدود به مطالعه موردی بر روی یک پل ارتباطی با پایههای فولادی در شهر کازرون پرداخته شده است و رفتار پل مذکور تحت اثر بارهای مختلف انفجاری مورد بررسی قرار میگیرد. برای انجام تحلیلهای موردنیاز، از نرمافزار اجزا محدود LS-DYNA استفاده شده است و خرابی موضعی پایههای پل و خرابی کلی پل با استفاده از معیار چرخش تکیهگاهی مورد ارزیابی قرار گرفته است. همچنین، با افزایش میزان ماده منفجره، میزان تغییر مکان دائمی ایجادشده در دال بتنی پل بیشتر میگردد که منجر به تغییر میزان خرابی از سطح کم به سطح متوسط میشود. علاوه بر این، نتایج نشان داد که استفاده از تیرهای فولادی در راستای طول دال بتنی پل، میزان تغییر شکلهای ایجادشده تحت اثر بارهای انفجاری را کاهش میدهد و متعاقباً میزان خرابی ایجادشده نیز کاهش مییابد همچنین نتایج نشان داد که هر چقدر عضو موردنظر به کانون انفجار نزدیکتر باشد میزان خرابی موضعی بیشتر بوده که در نهایت از محلی که خرابی موضعی بیشتر است پایه فولادی پل دچار خرابی کلی و فروریزش میگردد. | ||
| کلیدواژهها | ||
| پل بتنی با پایههای فولادی؛ بارگذاری انفجار؛ تحلیل اجزا محدود؛ ارزیابی خرابی؛ چرخش تکیهگاهی | ||
| عنوان مقاله [English] | ||
| Damage Evaluation of Concrete Bridge with Steel Piers Subjected to Explosive Loads | ||
| نویسندگان [English] | ||
| Sohrab Mirassi1؛ Mohammad Momeni2؛ Ahmad Hosseini Moorderaz3 | ||
| 1Assistant Professor, Department of Civil Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran | ||
| 2Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Fasa University, Fasa, Iran | ||
| 3MSc Student, Department of Civil Engineering, Bushehr Branch, Islamic Azad University, Bushehr, Iran | ||
| چکیده [English] | ||
| The transportation system infrastructure in any country encompasses roads, highways, and crucially, bridges. Among these components, bridges hold significant importance. Throughout their operational lifespan, structures endure various loadings that impact their design and necessitate strengthening measures. Evaluating and assessing the behavior of bridges designed and implemented decades ago, adhering to outdated regulations but still serving as access routes today, is vital. Notably, certain older bridges, particularly those with steel piers, require special attention due to the effects of aging on their behavior and susceptibility to various loads, including explosive ones. Finding solutions for ensuring their safety and implementing rehabilitation measures becomes imperative. This paper delves into a case study on a communication bridge in Kazerun city, focusing on bridges with steel piers. The investigation explores the bridge's behavior under the influence of different explosive loads through finite element analysis. The LS-DYNA finite element software was employed for the necessary analysis, evaluating both the local failure of the bridge piers and the overall failure of the entire bridge using the support rotation criterion. The study reveals that, as the explosive charge weight increases, the permanent displacement in the concrete slab of the bridge rises, leading to a shift in damage levels from low to medium. Furthermore, incorporating steel beams in the longitudinal direction of the concrete slab proves effective in reducing deformation caused by explosive loads, subsequently minimizing damage. The proximity of a specific bridge member to the explosion center correlates with a higher local failure rate. Ultimately, the areas experiencing greater local failure witness a subsequent general failure of the steel piers, bringing the bridge closer to collapse. | ||
| کلیدواژهها [English] | ||
| Concrete bridge with steel piers, Blast loading, Finite element analysis, Damage assessment, Support rotation | ||
| مراجع | ||
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