نشریه علمی سازه و فولاد

نشریه علمی سازه و فولاد

منحنی بار-خیز ورق دیوار برشی فولادی نیمه‌مقید در لبه‌ها و ارائه یک رابطه کاربردی برای برآورد مقدار خیز ماکزیمم حد الاستیک ورق

نوع مقاله : مقاله پژوهشی

نویسنده
گروه مهندسی عمران، مجتمع آموزش عالی تربت جام، تربت جام، ایران
چکیده
ورق­های نازک در دیوارهای برشی فولادی نیمه­مقید در لبه­ها (SSSW) در بارهای جانبی کوچک، کمانش کرده و این کمانش منجربه خیز (تغییرشکل خارج از صفحه) در ورق می­شود. شروع کمانش ورق در بارهای جانبی کوچک باعث می­شود تا ورق دیوار در ناحیۀ وسیعی دارای رفتار پس­کمانشی الاستیک ­باشد. برای مهندسان سازه و معماری، آگاهی از مقدار خیز ورق در بارهای مختلف، بسیار حائز اهمیت است؛ لذا بررسی تغییرات بار جانبی نسبت به خیز نظیر آن در ناحیۀ پس از کمانش الاستیک، دارای اهمیت بهسزایی است. در تحقیقات گذشته، دستگاه معادلات فن­کارمن برای بهدستآوردن میدان تغییرمکان ورق دیوار در ناحیۀ پسکمانشی الاستیک با استفاده از روش گالرکین حل شده و با استفاده از ظرفیت برشی نهایی، منحنی دوخطی ایده­آل بار جانبی-تغییرمکان افقی دیوار، تقریب زده شده و یک رابطه برای سختی الاستیک این دیوارها ارائه شده است. در این مقاله با استفاده از نتایج بهدستآمده از حل دستگاه معادلات فن­کارمن برای دیوارهای مختلف (تغییرات در عرض، ارتفاع، ضخامت ورق دیوار و تغییرات در ستون فرعی کنار دیوار)، خیز ورق دیوار در ناحیۀ الاستیک محاسبه شده و منحنی نیروی برشی-خیز در این ناحیه رسم شده است. همچنین یک رابطۀ کاربردی برای برآورد مقدار خیز ماکزیمم حد الاستیک ورق دیوار (خیز ماکزیمم متناظر با اولین نقطه از تسلیم ورق دیوار)، با استفاده از یادگیری ماشین و بهکارگیری تکنیک رگرسیون خطی، ارائه شده است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Load-Deflection Curve of Semi-Supported Steel Shear Wall, and Presentation of a Practical Relationship for Estimating the Maximum Elastic Deflection of the Plate

نویسنده English

Seyed Ebrahim Sadat Kholerdi
Assistant professor, Department of Civil Engineering, University of Torbat-e Jam, Torbat-e Jam, Iran
چکیده English

Thin plates in semi-supported steel shear walls (SSSW) buckle under small lateral loads, and this buckling leads to deflection (out-of-plane displacement) in the plate. The onset of buckling at small lateral loads causes the wall plate to exhibit elastic post-buckling behavior over a wide range. For structural and architectural engineers, knowing the amount of plate deflection under different loads is crucial. Therefore, investigating the variation of lateral load with respect to the corresponding deflection in the elastic post-buckling region is of significant importance. In previous research, the von Kármán plate equations have been solved using the Galerkin method to obtain the displacement field of the wall plate in the elastic post-buckling region. Utilizing the ultimate shear capacity, a bilinear idealization of the lateral load-horizontal displacement curve of the wall has been approximated, and a relationship for the elastic stiffness of these walls has been presented. In this paper, using the results obtained from solving the von Kármán equations for different walls (variations in width, height, plate thickness, and changes in the secondary column), the deflection of the wall plate in the elastic region is obtained, and the load-deflection curve in this region is plotted. Furthermore, a practical relationship is presented for estimating the maximum elastic deflection of the wall plate (the maximum deflection corresponding to the first yield point of the wall plate), using machine learning and applying linear regression techniques.

کلیدواژه‌ها English

Semi-Supported Steel Shear Wall
Elastic Post-Buckling
Plate Deflection
Von-Karman Equation
Machine Learning
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  • تاریخ دریافت 17 شهریور 1404
  • تاریخ پذیرش 27 مهر 1404
  • تاریخ اولین انتشار 27 مهر 1404
  • تاریخ انتشار 01 تیر 1404