ظرفیت لهیدگی اتصالات پیچی در ورق‌های موجدار فولادی

سیدشریفی, سیده سما; معززی مهر طهران, علیرضا

doi:10.22065/jsce.2025.503146.3644

ظرفیت لهیدگی اتصالات پیچی در ورق‌های موجدار فولادی

نوع مقاله : علمی - پژوهشی

نویسندگان

سیده سما سیدشریفی ¹

علیرضا معززی مهر طهران ²

¹ دانش آموخته‌ی کارشناسی ارشد، دانشکده‎‌ی مهندسی عمران، دانشگاه صنعتی شریف، تهران، ایران

² استادیار، گروه سازه، دانشکده مهندسی عمران، دانشگاه صنعتی شریف، تهران، ایران

10.22065/jsce.2025.503146.3644

چکیده

ورق‌های سردنورد موجدار در ساخت دیوارهای برشی، آبروها و ساخت مخازن کاربرد دارند. با توجه به تفاوت هندسی این ورق‌ها نسبت به انواع ورق صاف، انتظار می‌رود رفتار متفاوتی در این اتصالات مشاهده شود. شکاف قابل توجهی در درک و پیش‌بینی ظرفیت لهیدگی اتصالات پیچ و مهره‌ای آنها مطرح است و آیین‌نامه‌های موجود نیز در این خصوص روابط طراحی ارائه نکرده‌اند. این پژوهش با تمرکز بر این شکاف، دقت معادلات آیین‌نامه‌های طراحی موجود، AISI S100 وEC3، را در پیش‌بینی ظرفیت لهیدگی این اتصالات ارزیابی می‌کند و معادله‌ی جدیدی نیز برای محاسبه‌ی ظرفیت لهیدگی این اتصالات پیشنهاد می‌دهد. بدین منظور، با پیروی از دستورالعمل‌های AISI S905، تعداد ۵۴ مدل عددی با استفاده از روش اجزای محدود در نرم‌افزار آباکوس توسعه داده شده و بر عوامل کلیدی مانند قطر پیچ، ضخامت ورق و نوع فولاد تمرکز شده است. منطبق بر نتایج، این مطالعه ضریب لهیدگی جدیدی را برای شرایطی که نسبت قطر پیچ به ضخامت ورق (d/t) کمتر از 10 باشد، پیشنهاد می‌دهد که برخلاف مقدار ثابت استفاده‌شده درآیین‌نامه‌های طراحی AISI S100 و EC3، به‌طور خطی با افزایش نسبت d/t در این بازه کاهش می‌یابد. علاوه بر این، قطر پیچ با پارامتر جدید l جایگزین شده است که طول انحنای ورق موجدار در تماس با بدنه‌ی پیچ را نشان می‌دهد. نتایج حاکی از آن است که علیرغم پیش‌بینی نسبتاً مناسب روابط آیین‌نامه جهت کاربرد در نمونه‌های ورق موجدار، معادله پیشنهادی بواسطه‌ی در نظر گرفتن تغییرات خطی پارامتر d/t، ضمن بهبود نسبی دقت نتایج، تطابق بهتری با نتایج عددی می‌یابد.

کلیدواژه‌ها

اتصالات پیچی

ورق‌موجدار فولادی

سازه‌های سرد‌نورد

مدل‌سازی المان محدود

آیین‌نامه‌ها‌ی طراحی

موضوعات

مهندسی سازه و زلزله

عنوان مقاله English

Bearing Capacity of Bolted Connections in Steel Corrugated Sheets

نویسندگان English

SeyedehSama Seyedsharifi ¹

Alireza Moazezi Mehretehran ²

¹ M.Sc. Graduate, Civil Engineering Department, Sharif University of Technology, Tehran, Iran

² Assistant Professor, Structural Engineering Division, Civil Engineering Department, Sharif University of Technology, Tehran, Iran

چکیده English

Corrugated cold-formed steel sheets are widely utilized in the construction of shear walls, culverts, and storage tanks. Due to the geometric differences between these sheets and flat sheets, their bolted connections are expected to exhibit distinct mechanical behavior. However, there is a notable gap in the understanding and prediction of the bearing capacity of these connections, as current design standards do not provide specific equations for this purpose. This study aims to address this gap by assessing the accuracy of existing design equations in standards such as AISI S100 and EC3 for predicting the bearing capacity of bolted connections in corrugated sheets. Furthermore, a new equation is proposed to improve the prediction of bearing capacity. Following the guidelines outlined in AISI S905, 54 numerical models were developed using the Finite Element Method (FEM) implemented in ABAQUS software. The study focuses on key parameters, including bolt diameter, sheet thickness, and steel type. This study proposes a new bearing coefficient for cases where d/t<10, which, unlike the constant value used in EC3 and AISI S100, decreases linearly with the increase in d/t ratio within this range. Additionally, a new parameter, l, is introduced to replace the bolt diameter, representing the curve length of the corrugated sheet in contact with the bolt shank. The results indicate that despite the relatively accurate predictions of the design code equations for application to corrugated sheet specimens, the proposed equation, by considering the linear variations of the d/t parameter, not only improves the accuracy of the results but also achieves better alignment with the numerical outcomes.

کلیدواژه‌ها English

Bolted Connections

Corrugated Steel Sheets

Cold-Formed Structures

Finite Element Modeling

Design Codes

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