ارزیابی پاسخ تیرهای بتن مسلح تحت اثر بارهای انفجاری و تعیین محدوده پاسخ‌های متأثر از ایمپالس

حسینی, سید احمد; نجفی الموتی, محمد حسن

ارزیابی پاسخ تیرهای بتن مسلح تحت اثر بارهای انفجاری و تعیین محدوده پاسخ‌های متأثر از ایمپالس

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ استادیار، دانشگاه صنعتی مالک اشتر، تهران، ایران

² کارشناسی ارشد، دانشگاه صنعتی مالک اشتر،تهران، ایران

چکیده

در تعیین پاسخ سازهها تحت بارهای دینامیکی، پاسخ محدودة ارتعاش آزاد به علت حذف بار از معادلات، حالتی خاص محسوب می‌شود. ازآنجاکه قرارگیری پاسخ بیشینة سازهها در محدودة ارتعاش آزاد، معمولاً تحت اثر بارهای ضربه‌ای مثل بار انفجار رخ می‌دهد، دانستن این مسئله که بار انفجار و خود سازه باید دارای چه ویژگی‌هایی باشند تا پاسخ سازه در محدوده ارتعاش آزاد قرار گیرد، مسئله‌ای مهم در تحلیل سازه‌ها در برابر بارهای دینامیکی محسوب می‌شود. به همین منظور در این تحقیق، تیرهای بتن مسلح با استفاده از معادلات حرکت حاکم بر سیستمهای یک درجه آزادی، مورد بررسی قرار گرفتند. پس از حل معادلات حرکت در حالت ارتعاش آزاد و استخراج روابط خیز، از صحت این روابط با استفاده از تحقیقات آزمایشگاهی معتبر، مدل اجزا محدود و دستورالعمل UFC 3-340-02، اطمینان حاصل شد. در ادامه، روابط و نمودارهایی جهت تعیین محدوده پاسخهای متأثر از ایمپالس ارائه گردید.

کلیدواژه‌ها

20.1001.1.26762935.1402.14.4.2.8

موضوعات

عمران- سازه

عنوان مقاله [English]

Evaluation of the Response of RC Beams Under the Effect of Explosive Loads and Determination of the Range of Responses Affected by Impulse

نویسندگان [English]

seied ahmad hosseini ¹
Mohammad hasan Najafialmooti ²

¹ Assistant Professor malek ashtar University of Technology, Tehran, Iran

² Master's degree, ، Malek Ashtar University of Technology, Tehran, Iran

چکیده [English]

In determining the response of structures under dynamic loads, the response of the free vibration range is considered a special case due to removing the load from the equations. Since the maximum response of structures in the range of free vibration usually occurs under the effect of shock loads such as blast load, knowing what characteristics the blast load and the structure itself must have so that the response of the structure is in the range of free vibration. , is considered an important issue in the analysis of structures against dynamic loads. For this purpose, in this research, reinforced concrete beams were investigated using the equations of motion governing single-degree-of-freedom systems. After solving the equations of motion in the free vibration state and extracting the yield relations, the correctness of these relations was ensured by using valid laboratory research, finite element model and UFC 3-340-02 guidelines. In the following, relations and diagrams were presented to determine the range of responses affected by impulse.

کلیدواژه‌ها [English]

Free Vibration
Blast Loading
Reinforced Concrete Beams
SDOF System
Impulse Effect Range

مراجع

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21. Hosseini, S. A.; Najafi, M. H.; “Parametric Analysis of Reinforced Concrete Beams under Blast Load”; Adv. Defence Sci. & Technol. 2023, 14(1), 1-10 (In Persian). https://dor.isc.ac/dor/20.1001.1.26762935.1402.14.1.1..1