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چیدمان بهینه ابر مهاربندهای کمانشناپذیر بهمنظور بهینهسازی رفتار سازههای بلند تحت بار انفجار | ||
علوم و فناوریهای پدافند نوین | ||
مقاله 10، دوره 11، شماره 2 - شماره پیاپی 40، تیر 1399، صفحه 211-230 اصل مقاله (2.99 M) | ||
نوع مقاله: مقاله پژوهشی | ||
نویسندگان | ||
رضا کامگار* 1؛ نوراله مجیدی2؛ هیثم حیدرزاده3 | ||
1دانشگاه دولتی شهرکرد، دانشکده ی فنی و مهندسی، گروه مهندسی عمران، اتاق 57 | ||
2دانشکده ی فنی و مهندسی دانشگاه دولتی شهرکرد | ||
3گروه مهندسی عمران - دنشکده فنی و مهندسی - دانشگاه دولتی شهرکرد | ||
تاریخ دریافت: 11 خرداد 1398، تاریخ بازنگری: 28 شهریور 1398، تاریخ پذیرش: 25 خرداد 1399 | ||
چکیده | ||
استفاده از مهاربندهای کمانشناپذیر در دهه هشتاد میلادی در ژاپن شروع شد و به دنبال آن در نقاط دیگر دنیا ادامه یافت. استفاده از این نوع مهاربندها سبب رفع بسیاری از نقایص رفتاری مربوط به مهاربندهای فولادی متداول میشود که ناشی از اختلاف مابین ظرفیت کششی و فشاری آنها است. در این مقاله تأثیر نحوه جانمایی ابر مهاربندهای کمانشناپذیر بر پاسخ سازههای بلند تحت بار انفجار بررسی میشود. برای این منظور یک سازه 30طبقه به دوازده حالت مختلف توسط ابر مهاربندهای کمانشناپذیر مقاومسازی میشود و بر مبنای بیشینه پاسخ سازه تحت بار انفجار بهترین حالت جانمایی برای ابر مهاربند معرفی میشود. در این راستا سازه تحت چهار حالت بار انفجار ناشی از انفجار1000 و 1200 کیلوگرم TNT در فاصلههای 5 و 10 متری از سازه قرار میگیرد و عملکرد سازه با استفاده از مفاهیم جابجایی بام، چرخش سازه، دریفت طبقات، برش و ممان پایه بررسی میشود. نتایج نشان میدهند که با کاهش مقدار وزن ماده منفجره و همچنین افزایش مقدار فاصلهماده منفجره از سازه مقدار اثرات تخریبی و بیشینه پاسخ سازه کاهشیافته و سازه به سطح ایمن عملکردی (IO) بازگردانده شده است. همچنین نتایج نشان میدهد که حالت اصلی A1، بهترین حالت جانمایی برای ابر مهاربندهای کمانشناپذیر است و در این حالت میزان فولاد مربوط به ابر مهاربند بیش از 16درصد کاهش مییابد. | ||
کلیدواژهها | ||
ابر مهاربند کمانش ناپذیر؛ بار انفجار؛ دریفت طبقات؛ رفتار غیرخطی؛ رفتار چرخهای | ||
عنوان مقاله [English] | ||
Optimum Layout of Mega Buckling-Restrained Braces to Optimize the Behavior of Tall Buildings Subjected to Blast Load | ||
نویسندگان [English] | ||
R. Kamgar1؛ N. Majidi2؛ H. Heidarzadeh3 | ||
1Shahrekord University, Shahrekord, Iran | ||
2Shahrekord University, Shahrekord, Iran | ||
3Civil Engineering Department, Shahrekord University | ||
چکیده [English] | ||
The use of buckling-restrained braces began in Japan at 1980s and was then followed by other countries all over the world. Many behavioral problems associated with the conventional steel braces might be neglected when this type of bracing system is used, due to the difference between their tension and compression strength capacity. In this paper, the effect of mega buckling-restrained braces on the response of tall structures subjected to the blast load is investigated. For this purpose, a 30-story structure is retrofitted by mega buckling-restrained braces in twelve different modes. Then, the best positioning of this control system is introduced based on the maximum response of the structure. In this regard, the structure is subjected to four states of blast loads produced by 1000 and 1200 kilograms of TNT at a distance of 5 and 10 meters from the structure. The results showed that by decreasing the amount of blast material and also increasing the distance of TNF from the structure, the damaging effects and also the maximum response of the structure reduced; and therefore, the structure went to the safe level (IO). The results also indicated that the A1 state is the best positioning for the controlled system, in which the maximum displacement of the roof, the maximum rotation of the structure is less than these values for the original structure (the structure with the conventional braces system). Also, the A1 state can be chosen as the best candidate for placement of the controlled system since it reduces the weight of the bracing system more than 16% rather than this value for the original structure. | ||
کلیدواژهها [English] | ||
Mega Buckling-Restrained Braces, Blast Load, Drift Stories, Nonlinear Behavior, Hysteretic Behavior | ||
مراجع | ||
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