بررسی رفتار دیوار برشی فولادی کمانش‌تاب تحت اثر حریق

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد نور

2 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد نور، نور، ایران

3 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد نور، نور

4 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه دامغان

چکیده

در این تحقیق، رفتار دیوار برشی فولادی کمانش‌تاب تحت بارگذاری حریق و چرخه‌ای مورد بررسی قرار گرفت. دیوار فولادی نوین مورد نظر در این مطالعه از دو ورق فولادی نازک با فاصله کم از یکدیگر تشکیل شده است که بر روی هر ورق فولادی شیارهای مورب تعبیه شده است که این شیارها در خلاف جهت یکدیگر می‌باشند. مدل عددی المان محدود با سه نمونه آزمایشگاهی اعتبارسنجی شد و پس از اطمینان از نحوه مدل‌سازی، مطالعه پارامتریک با در نظر گرفتن متغیرهایی نظیر ضخامت ورق دیوار، عرض شیار، عرض نوار بین دو شیار و درجه حرارت انجام گرفت. در مجموع 256 مدل عددی المان محدود تحت تحلیل کوپل دما- تغییرمکان قرار گرفت. نتایج تحلیل‌ها نشان داد که دمای زیاد، موجب کاستن عملکرد لرزه‌ای دیوار فولادی می‌شود، به طوری که در دمای 917 درجه سلسیوس ظرفیت باربری، 92 درصد کاهش می‌یابد. علاوه بر این، با افزایش دما، نقطه تسلیم ورق و قاب در تغییرمکان کمتر اتفاق می‌افتد. میانگین کاهش مقاومت برشی در دماهای 458، 642 و 917 درجه سلسیوس به ترتیب 18، 46 و 92 درصد در مقایسه با مقاومت برشی در دمای 20 درجه سلسیوس می‌باشد. همچنین با افزایش درجه حرارت به 917 درجه سلسیوس، شکل‌پذیری به طور میانگین 75 درصد افزایش یافت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of the Behavior of Buckling-Restrained Steel Plate Shear Wall under Fire Loading

نویسندگان [English]

  • Fereydoun Masoumi-Zahandeh 1
  • Mohamad Hoseinzadeh 2
  • Sepideh Rahimi 3
  • Mehdi Ebadi-Jamkhaneh 4
1 Department of Civil Engineering, Nour branch, Islamic Azad University, Nour, Iran.
2 Department of Civil Engineering, Islamic Azad University Nour Branch, Nour, Iran
3 Department of Civil Engineering, School of Engineering, Islamic Azad University Nour Branch, Nour.
4 Department of Civil Engineering, School of Engineering, Damghan University.
چکیده [English]

In this study, the seismic behavior of an all-steel buckling-restrained (AB) steel plate shear wall (SPSW) with incline slits under fire and cyclic loading was investigated. ABSPSW was composed of two thin steel infill plates with a narrow distance from each other, which were embedded with incline slits on each plate. These slits were in opposite directions to each other. The finite element (FE) numerical model was validated with three test specimens and after ensuring the modeling strategy, the parametric study was performed by considering variables such as wall plate thickness, slit width, strip width between two slits, and degree of temperature. A total of 256 FE numerical models were subjected to coupled temperature-displacement analysis. The results of the analysis showed that the high temperature reduced the seismic performance of the ABSPSW so that at 917oC, the load-bearing capacity was reduced by 92%. In addition, with the increase in the temperature, the yield point of the infill plate and frame occurred in a small displacement. The average decrease in shear strength at 458°C, 642°C, and 917°C was 18%, 46%, and 92%, respectively, compared to the shear strength at 20°C. Also, with increasing the temperature to 917°C, ductility increased by an average of 75%.

کلیدواژه‌ها [English]

  • Fire engineering
  • Steel structures
  • Thermal effects
  • Seismic engineering
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