مهندسی سازه و ساخت

مهندسی سازه و ساخت

مطالعه‌ی تجربی سقف کامپوزیت متشکل از دال پیش ساخته‌ی بتنی با عملکرد بالا، تیر فولادی و گروت پرمقاومت به عنوان کلید برشی تحت بارگذاری گسترده

نوع مقاله : علمی - پژوهشی

نویسندگان
1 کارشناس ارشد، دانشکده مهندسی عمران، دانشگاه صنعتی اصفهان، اصفهان، ایران
2 استاد، دانشکده مهندسی عمران، دانشگاه صنعتی اصفهان، اصفهان، ایران
3 دانشیار، دانشکدة مهندسی عمران، دانشگاه صنعتی اصفهان، اصفهان، ایران
10.22065/jsce.2025.547780.3820
چکیده
در سازه‌های فولادی، انتخاب سیستم سقفی که وزن مرده‌ی سازه و میزان عملیات اجرایی را کاهش و سرعت ساخت را افزایش دهد، بسیار حائز اهمیت است. سقف‌های کامپوزیت فولادی-بتنی از رایج‌ترین سیستم‌های سقف کامپوزیت هستند؛ اما وابستگی اجرایی آن‌ها به ورق عرشه فولادی، قالب‌ بندی و بتن ‌ریزی درجا باعث می‌شود که بی نقص نباشند. در این پژوهش سقف کامپوزیت فولادی-بتنی نوینی معرفی شده است که از دال‌های پیش ساخته‌ی بتنی با عملکرد بالا (HPC)، تیرهای فولادی دارای برش گیر و گروت منبسط‌شونده‌ی پرمقاومت به عنوان کلید برشی در دو جهت طولی و عرضی تشکیل شده است. این سیستم مشکلات ذکرشده‌ی سیستم‌های سقف کامپوزیت متداول را برطرف می‌کند. دال‌های پیش‌ساخته‌ی بتنی نازک با عملکرد بالا با کاهش وزن کل سازه و نیرو‌ی زلزله، امکان استفاده از اعضای سازه‌ای ظریف‌تر را فراهم کرده و سرعت ساخت را افزایش می‌دهند. برای ارزیابی دقیق‌تر عملکرد کامپوزیت در سیستم پیشنهادی، یک نمونه‌ی کامپوزیت تحت بارگذاری گسترده قرار گرفت. این نمونه برخلاف اغلب مطالعات پیشین، دارای دو دهانه، چندین دال پیش‌ ساخته و ابعاد تمام‌ مقیاس بود. پس از تحمل 15/2 کیلو نیوتن بر متر مربع بار گسترده، نمونه‌ی کامپوزیت نه‌تنها دچار شکست نشد، بلکه تغییرشکل پلاستیک نیز تجربه نکرد. حداکثر تغییر مکان تیر میانی نمونه‌ی کامپوزیت 6/7٪ کمتر از یک سقف کامپوزیت فولادی-بتنی با بتن ریزی درجا و دارای ابعاد مشابه بود. بر اساس آیین‌نامه‌های AISC 360-22 و ASCE/SEI 7-22، نمونه‌ی کامپوزیت الزامات حداکثر تغییرمکان مجاز حالت بهره‌برداری و بارگذاری حداقل طراحی برای اغلب ساختمان‌های مسکونی و اداری را برآورده می‌سازد. این سیستم پیشنهادی یک راهکار مطمئن، کارآمد و سریع برای اجرای سقف در سازه‌های فولادی ارائه می‌دهد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Experimental study on precast HPC slab-steel composite floor with high-strength grout shear key under uniform stacking loading

نویسندگان English

Sayed Parsa Mirmoghtadaei 1
Davood Mostofinejad 2
Mohammad Reza Eftekhar 3
1 Master of Science, Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
2 Professor, Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
3 Associate Professor, Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
چکیده English

In steel structures, selecting a floor system that lowers the structure’s self-weight, reduces labor-intensive tasks, and accelerates construction is crucial. Conventional steel-concrete composite floors are among the most commonly used composite floor systems, but the need for steel decking, temporary formwork, and in-situ concreting stops them from being ideal. This study introduces an innovative steel-concrete composite floor system, comprising precast high-performance concrete (HPC) slabs, steel beams with pre-welded shear studs, and high-strength expansive grout as a shear key, in both longitudinal and transverse directions. This composite floor system eliminates the above-mentioned problems of conventional steel-concrete composite floors. Thin HPC precast slabs lower the overall structural weight and seismic forces, facilitate the use of slender structural members, and accelerate construction. For more accurate evaluation of the composite action in the proposed floor system, a composite specimen was subjected to uniform stacking loading, which, unlike most previous research studies, takes advantage of having two spans, multiple precast slabs, and full-scale size. After bearing 15.2 kN/m² of uniform stacking load, the composite specimen not only did not fail, but also did not experience plastic deformation. The maximum deflection of the specimen’s middle beam was 6.7% less than that of an equal-sized in-situ steel-concrete composite floor. According to AISC 360-22 and ASCE/SEI 7-22, the composite specimen satisfies the serviceability deflection limit and minimum design loads for most residential and office uses. The proposed composite floor offers a reliable and efficient solution that expedites flooring in steel structures.

کلیدواژه‌ها English

Precast concrete slab
HPC
Steel-concrete composite floor
High-strength grout
Uniform loading
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  • تاریخ دریافت 05 مهر 1404
  • تاریخ بازنگری 05 آبان 1404
  • تاریخ پذیرش 22 آبان 1404