ارزیابی الگوی بارگذاری مستطیلی در تحلیل غیر خطی پلهای با عرشه مختلط تحت اثر بار انفجار

نوع مقاله : پژوهشی

نویسندگان

• علیرضا حبیبی
• نیما خالدی

دانشگاه کردستان

10.22067/civil.v26i2.20451

چکیده

با وجود پیشرفت های چشم‌گیری که در مورد تحلیل انفجار وجود دارد، کاربردهای تحلیل غیرخطی سازه ها تحت اثر انفجار به قاب ها محدود می‌شود و رفتار سازه ای پل‌ها تحت انفجار موضوعی است که در سال های اخیر توجه محققان را به‌خود جلب نموده است. تحلیل دینامیکی غیرخطی می تواند دقیق ترین پاسخ های سازه را تحت اثر انفجار نتیجه دهد ولی استفاده از آن در بیشتر موارد به‌دلیل پیچیدگی و زمان های محاسباتی بیش از حد آن منطقی نیست.روش بار افزون به‌عنوان یک راه حل مناسب و جالب برای تحلیل غیرخطی به‌دلیل سادگی و توانایی آن برای تخمین تقاضای تغییرشکل با دقت قابل‌قبول بدون تلاش محاسباتی و مدل‌سازی حجیم تحلیل دینامیکی غیرخطی مطرح است. در این تحقیق، یک الگوی بار‌‌گذ‌اری مستطیلی برای تخمین پاسخ های غیرخطی پل‌های مرکب تحت اثر انفجار با استفاده از روش بار افزون توسعه داده می شود. به این منظور ابتدا یک روش مؤثر برای معادل‌سازی استاتیکی بارگذاری انفجار پیشنهاد می‌گردد و سپس به ارزیابی دقت تحلیل استاتیکی غیرخطی براساس الگوی بارگذاری توسعه‌یافته پرداخته می شود. نتایج حاصل از این تحقیق حاکی از آن است که روش پیشنهادی می تواند به ‌سادگی برای تخمین محافظه کارانه ی تغییرمکان حداکثر پل‌های فولادی با عرشه‌ی مختلط در اثر بارگذاری انفجار به‌‌کار رود.

کلیدواژه‌ها

• تحلیل دینامیکی غیر خطی
• تحلیل استاتیکی غیر خطی
• بارگذاری انفجار
• پلهای با عرشه مختلط
• طیف

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عنوان مقاله [English]

EvaluatingRectangular Loadingpattern in NonlinearAnalysis ofCompositeBridgesSubjected to Blast Loading

نویسندگان [English]

• AliReza Habibi
• Nima Khaledi

, University of Kurdistan, Iran.

چکیده [English]

While significant advances have been made on the blast analysis, applications of nonlinear analysis of structures under explosion have been limited to the frames and structural behavior of bridges subjected to blast is an issue that has attracted attention of researchers in recent years. Nonlinear dynamic analysis can be lead to the most accurate responses of the structure under blast but the use of it is not justified in many cases because of its complexity and excessive computing times. Pushover method is often seen to be a viable and attractive alternative to nonlinear analysis because of its simplicity and ability to estimate deformation demands with acceptable accuracy without the intensive computational and modeling effort of a nonlinear dynamic analysis. In this study, a rectangular load pattern is developed to estimate nonlinear responses of composite bridges subjected to blast using pushover method. For this purpose, first, an efficient method is proposed to determine equivalent static blast loading and then the accuracy of pushover analysis based on the developed load pattern is evaluated. It is shown that the proposed method can be easily used to conservatively estimate maximum displacement of composite steel girder bridges under explosion.

کلیدواژه‌ها [English]

• Nonlinear Dynamic Analysis
• nonlinear static analysis
• Blast Loading
• composite steel girder bridges
• spectrum

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