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ارزیابی عملکرد یک ستون بتن مسلح در برابر بار انفجار با استفاده از روش تحلیل انفجاری نموی | ||
| نشریه مهندسی عمران امیرکبیر | ||
| دوره 54، شماره 4، تیر 1401، صفحه 1441-1460 اصل مقاله (2.65 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2021.19569.7202 | ||
| نویسندگان | ||
| علی سیفی نیا1؛ محمدرضا محمدی زاده* 2 | ||
| 1گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه هرمزگان | ||
| 2گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه هرمزگان، بندرعباس، ایران | ||
| چکیده | ||
| برای جامعه ی مدرن به منظور محافظت و امنیت شهروندان خود، طراحی ایمن سازه ها در برابر بارهای انفجار از اهمیت ویژه ای برخوردار است. از آنجا که اعتبارسنجی و بهینهسازی سازه های محافظ در برابر بارهای انفجار با استفاده از تست های تجربی در مقیاس واقعی، یک چالش به حساب می آید. لذا بایستی از ابزارهای عددی پیشرفته مانند روش المان محدود، حجم محدود و تفاضل محدود در این خصوص استفاده نمود. در این مطالعه، هدف ارزیابی عملکرد یک ستون بتن مسلح با استفاده از روش آماری تحلیل انفجاری نموی که الهام گرفته از روش تحلیل دینامیکی نموی است، می باشد. به منظور رسیدن به این هدف یک ستون بتنی در نرمافزار AUTODYN در فواصل مختلف به صورت افزایشی در معرض بار انفجار نیمکره در سطح زمین به صورت شبیه سازی روش همبستگی اویلری-لاگرانژی قرار می گیرد. سپس با انتخاب شاخص مناسب خرابی و حدود عملکرد چرخش تکیه گاهی اعضای فشاری بر اساس مبحث 21 از مجموعه مقررات ملی ایران و ASCE/SEI 59-11 نمودارهای IEA ترسیم و خلاصه سازی می شوند. در پایان، منحنی شکنندگی و نمودارهای فشار-ضربه برای سازه ستون به منظور تعیین سطح عملکرد از تحلیلIEA به دست میآید. نتایج نشان می دهد احتمال فراگذشت از حالت حدی درج (میزان خرابی کم) برای مقیاس شدت برابر با یک (1=IM=1⁄Z) به طور تقریبی برابر 80%، برای حالت حدی (خرابی متوسط) حدود 60% و حالت خرابی زیاد %40 است. | ||
| کلیدواژهها | ||
| تحلیل انفجاری نموی؛ تحلیل دینامیکی افزاینده؛ عملکرد؛ منحنی شکنندگی؛ نمودارهای IEA؛ فشار-ضربه | ||
| موضوعات | ||
| بارگذاری انفجاری | ||
| عنوان مقاله [English] | ||
| Evaluation Performance of a Reinforced Concrete Column Subjected to Explosion Using Incremental Explosive Analysis | ||
| نویسندگان [English] | ||
| Ali Seifinia1؛ Mohammad Reza Mohammadizadeh2 | ||
| 1Department of Civil Engineering, Faculty of Technical and Engineering, University of Hormozgan | ||
| 2Department of Civil Engineering, Faculty of Technical and Engineering, University of Hormozgan | ||
| چکیده [English] | ||
| To protect citizens and infrastructures in modern society, the safe design of structures against accidental explosion is a particular importance. In this study, the aim is to evaluate the performance of a reinforced concrete column using incremental explosive analysis (IEA), which is inspired by the method of incremental dynamic analysis. In order to achieve this goal, the concrete moment frame is designed for dead, live, and earthquake loads based on Iranian national regulations codes in Etabs software. Then, an exterior designed column related to the RC moment frame is analyzed under different ground blast intensities (hemispherical explosions at the ground level) at the stand of distances 3, 5, 7, 10, 12, 15, 17 and 20 meters. Eulerian-Lagrangian coupling method has been used to obtain the dynamic response of the structure against rapid explosion load in Autodyn. After completing the analysis and obtaining the structural response, the IEA Curves are drawn as a structural response in terms of the explosion intensity. Fragility curves also are obtained to determine the probability of exceeding each limit state. The results show that the probability of exceeding the limit state Ls-1 for intensity measure equals to 1 approximately equals to 80%, for the Ls-2 is about 60% and for the Ls-3 is 40%. Finally, the pressure-impulse diagram on a logarithmic scale is obtained as the combination of pressures and impulses which produce the column response in the three considered limit states. The results show that fragility curves and pressure-impulse diagrams, along with IEA curves provide useful information to design. | ||
| کلیدواژهها [English] | ||
| Incremental explosion analysis, Incremental dynamic analysis, Performance, Fragility curve, IEA diagrams, P-I diagram | ||
| مراجع | ||
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