ارزیابی خسارت سد بتنی دو قوسی باتوجه‌به سرعت و فرکانس متوسط ناشی از موج انفجار در میدان نزدیک

نجفی, محسن; کارکن, محمد; قنبری, اکبر; پرویز, محسن

ارزیابی خسارت سد بتنی دو قوسی باتوجه‌به سرعت و فرکانس متوسط ناشی از موج انفجار در میدان نزدیک

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشجوی دکتری، گروه مهندسی عمران، واحد لارستان، دانشگاه آزاد اسلامی، لارستان، ایران

² استادیار گروه عمران، دانشکده مهندسی، واحد لارستان ،دانشگاه آزاد اسلامی، لارستان، ایران

³ دکتری تخصصی، گروه مهندسی عمران، واحد تهران شرق، دانشگاه آزاد اسلامی، تهران، ایران

چکیده

سد‌ها یکی از اجزاء حیاتی جوامع بشری و از سرمایه‌های مهم استراتژیک هر جامعه‌ای می‌باشند که نقش قابل‌توجهی در توسعه پایدار کشور دارند. در این پژوهش به ارزیابی خسارت ناشی از انفجار سد بتنی دو قوسی با توجه‌به سرعت و فرکانس متوسط ناشی از انفجار در میدان نزدیک پرداخته‌شده است. مدل ماده مورداستفاده در شبیه‌سازی عددی مواد منفجره، هوا، آب و بتن است که با نرم‌افزار LS-DYNA مدل‌سازی گردیده است. روش حل مسئله مورداستفاده جهت بارگذاری انفجار در مدل‌سازی LBE می‌باشد. با استفاده از این روش انتشار موج فشار ناشی از انفجار و یافتن نقاط بحرانی بدنه سد در مقابل انفجار موردبررسی قرارگرفته است. سپس با توجه به تغییر در عمق انفجار، فاصله از بدنه سد بتنی و بار انفجاری، پاسخ‌های ساختاری و ویژگی‌های خسارت سد در سناریوهای مختلف انفجار بررسی‌شده است. همچنین با استفاده از پارامترهای لرزش از قبیل حداکثر مجموع برداری سرعت ذرات (PVS) و میانگین فرکانس (MF) به ارزیابی و پیشنهاد طیف ترکیبی، به روشی جهت طراحی سد مقاوم در برابر انفجار و یافتن فاصله ایمن در مواقع بحرانی رسیده است. در پایان دو طیف PVS-MF پیشنهادی با لحاظ وزن خرج و فاصله آنها جهت دسته‌بندی بهینه و مفید خسارت سد، به‌صورت حالت جزئی، متوسط و شدید خسارت جهت ارزیابی اولیه و بحرانی پیشنهاد گردیده است.

کلیدواژه‌ها

20.1001.1.20086849.1402.14.2.3.5

عنوان مقاله [English]

Evaluation of Damage of Double Curvature Arch Concrete Dam According to the Mean Frequency and Velocity Caused by the Blast Wave in the Near-Field

نویسندگان [English]

Mohsen Najafi ¹
Mohamed Karkon ²
Akbar Ghanbari ²
Mohsen Parviz ³

¹ Ph.D. Candidate, Department of Civil Engineering, Larestan Branch, Islamic Azad University, Larestan, Iran

² Department of Civil Engineering, Larestan Branch, Islamic Azad University, Larestan, Iran.

³ Ph.D. Department of Civil Engineering, East Tehran Branch, Islamic Azad UniversityIran, Tehran,

چکیده [English]

Dams are one of the vital components of human societies and one of the strategically important assets of any society with a significant role in the sustainable development of the country. In this research, the damage caused by the blast of a double curvature arch concrete dam has been evaluated according to the mean velocity and frequency caused by the blast in the near-field. The model of the material used is the numerical simulation include the explosives, air, water, and concrete, which has been modeled. The problem-solving method used to apply the blast in modeling is Load Blast Enhanced. Using this method, the propagation of the pressure wave caused by the blast and finding the critical points of the dam body against the blast have been investigated. Then, the structural responses and the dam damage characteristics in different blast scenarios have been investigated according to the change in the blast depth, the distance from the concrete dam body, and the blast load. Also, by using vibration parameters such as peak velocity summation (PVS) and mean frequency (MF), the combined spectrum has been evaluated and proposed as a way to design a blast-resistant dam and find a safe standoff distance in case of emergency. Finally, two PVS-MF spectra have been suggested according to the charge weight and their distance for optimal and useful classification of dam damage according to three modes: slight, moderate, and severe, for initial and critical evaluation.

کلیدواژه‌ها [English]

LS-DYNA
Damage
Explosion
Concrete Arch Dam

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