مهندسی سازه و ساخت

مهندسی سازه و ساخت

مقایسه اقتصادی طراحی به روش LRFD با روش عملکردی در طراحی قاب‌های خمشی بتن آرمه کوتاه مرتبه تحت بارگذاری انفجاری

نوع مقاله : علمی - پژوهشی

نویسندگان
1 استادیار، دانشکده فنی و مهندسی، دانشگاه آیت الله بروجردی، بروجرد، ایران
2 دکتری، دانشکده عمران معماری و هنر، دانشگاه آزاد اسلامی و احد علوم و تحقیقات، تهران، ایران
3 استاد، دانشکده فنی و مهندسی، دانشگاه لرستان، خرم‌آباد، ایران
چکیده
با توجه به هزینه‌های بالای ساخت و بهره‌برداری یک سازه، اقتصاد نقش حیاتی را در طراحی سازه‌ها ایفا می کند. یک طراحی مناسب علاوه بر رعایت الزامات و مقررات‌های ساختمان باید از منظر اقتصادی نیز بهینه طراحی گردد. در طراحی سازه‌ها در مقابل انفجار، از آن جا که روشی مانند استفاده از ضریب رفتار وجود ندارد و ضریب رفتار موجود برای طراحی لرزه‌ای سازه‌ها در مورد رفتار سازه‌ها در مقابل انفجار صدق نمی‌کند. لذا این پژوهش به مقایسه طراحی به روش LRFD و طراحی بر اساس عملکرد در دو قاب 2 طبقه بتن آرمه بهمراه دیوار برشی بتن مسلح که تحت دو بار انفجار 1 تن TNT به فاصله 20 متری و 10 تن TNT به فاصله 30 متری از سازه قرار دارد، می‌پردازد. در ابتدا دو نمونه سامانه توام قاب خمشی و دیوار برشی بتن مسلح تحت دو حالت بارگذاری انفجار سطحی (ترکیب بار انفجاری مطابق مبحث ششم مقررات ملی ساختمان)، با انجام تحلیل‌های دینامیکی خطی، به روش LRFD طراحی شده‌اند. سپس طرح‌های حاصل در مقابل ترکیب بار فوق‌الذکر به روش دینامیکی غیرخطی تحلیل شده و سطوح عملکرد تامین شده توسط این سازه‌ها، مورد ارزیابی قرار گرفته‌اند. در مرحله بعد مدل‌های مذکور، به روش طراحی براساس عملکرد، جهت تامین سه سطح عملکرد قابلیت بهره‌برداری بی‌وقفه، ایمنی جانی و آستانه فرو ریزش طراحی شده‌اند. نتایج نشان می‌دهد که اختلاف قابل توجهی میان وزن مصالح مصرفی طرح حاصل از روش LRFD و طرح‌های حاصل از طراحی برای سطوح عملکرد IO، LS و CP مشاهده می‌شود. این اختلاف در انفجار 30 تن TNT در قاب‌ با دیوار برشی در دهانه‌های کناری به ترتیب برابر 10، 41 و 48 درصد و در مدل دیوار برشی در دهانه‌ی وسط به ترتیب برابر 7، 54 و 60 درصد می‌باشد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Economic comparison of LRFD design with functional design in the design of short-rise reinforced concrete flexural frames under explosive loadinge

نویسندگان English

Pouya Hassanvand 1
Sajjad Mohammadian Abi 2
Mojtaba Hosseini 3
1 Assistant professor, Department of civil engineering, Ayatollah Boroujerdi university, Boroujerd, Iran
2 Ph.D, Department of civil engineering, Islamic Azad University science and research Branch, Tehran, Iran
3 Professor, Department of civil engineering, Lorestan university, khoramabad, Iran
چکیده English

Given the high costs associated with the construction and operation of a structure, economics plays a crucial role in structural design. A proper design, in addition to meeting building requirements and regulations, must also be optimized from an economic standpoint. In designing structures to withstand explosions, there is no method analogous to using a behavior factor, and the existing behavior factor for seismic design does not apply to the behavior of structures against explosions. This research compares LRFD design and performance-based design in two 2-story reinforced concrete frames with reinforced concrete shear walls subjected to two explosions: 1 ton of TNT at a distance of 20 meters and 10 tons of TNT at a distance of 30 meters from the structure. Initially, two samples of combined moment frame and reinforced concrete shear wall systems under two surface explosion loading conditions (explosive load combination according to the sixth chapter of the National Building Regulations) have been designed using the LRFD method through linear dynamic analyses. Subsequently, the resulting designs have been analyzed against the aforementioned load combination using non-linear dynamic analysis, and the performance levels provided by these structures have been evaluated. In the next step, the mentioned models have been designed using the performance-based design method to achieve three performance levels: Immediate Occupancy, Life Safety, and Collapse Prevention. The results indicate a significant difference between the weight of materials used in the designs resulting from the LRFD method and those designed for IO, LS, and CP performance levels. This difference in the 30-ton TNT explosion in frames with shear walls in the side spans is 10, 41, and 48 percent, respectively, while in the shear wall model in the middle span, it is 7, 54, and 60 percent, respectively.

کلیدواژه‌ها English

Explosion
LRFD
Performance-based
Design Economic
Design Performance Levels
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دوره 13، شماره 02 - شماره پیاپی 103
اردیبهشت 1405
صفحه 104-126

  • تاریخ دریافت 03 تیر 1404
  • تاریخ بازنگری 09 شهریور 1404
  • تاریخ پذیرش 26 شهریور 1404