مطالعه آزمایشگاهی تاثیر بار ثقلی بر مشخصه های لرزه ای دیوارهای برشی سرد نورد شده فولادی دارای پوشش پرسلان

صولت تفتی, سعید رضا; جواهری تفتی, محمدرضا; ورعی, حسام

doi:10.22065/jsce.2025.514914.3694

مطالعه آزمایشگاهی تاثیر بار ثقلی بر مشخصه های لرزه ای دیوارهای برشی سرد نورد شده فولادی دارای پوشش پرسلان

نوع مقاله : علمی - پژوهشی

نویسندگان

سعید رضا صولت تفتی ¹

محمدرضا جواهری تفتی ²

حسام ورعی ³

¹ دانشجوی دکتری، گروه مهندسی عمران، واحد تفت، دانشگاه آزاد اسلامی، یزد، ایران

² استادیار، گروه مهندسی عمران، واحد یزد، دانشگاه آزاد اسلامی، یزد، ایران

³ استادیار، گروه مهندسی، موسسه آموزش عالی آل طه، تهران، ایران

10.22065/jsce.2025.514914.3694

چکیده

استفاده از پرسلان با هر نقش و نگار دلخواه برای پوشش قاب فولادی سبک علاوه بر تأمین مقاومت سازه‌ای ما را از نماسازی نیز بی‌نیاز می‌سازد. برای شناخت بیشتر رفتار لرزه‌ای دیوارهای برشی ساخته‌شده از قاب فولادی سبک با پوشش جدید پرسلان، هشت نمونه قاب فولادی سردنوردشدۀ تمام مقیاس با چهار پیکربندی مختلف‌ دارای پوشش پرسلان به ابعاد 2/4×1/2 متر در دو گروه یکسان، یکی با بار ثقلی و دیگری بدون بار ثقلی، تحت بار جانبی چرخه‌ای استاندارد آزمایش ‌شدند. مودهای گسیختگی در تمام مراحل بارگذاری برای تعیین عوامل تأثیرگذار بر شکل‌‌پذیری نمونه‌ها مورد توجه و بررسی واقع گردیدند. با استفاده از داده‌های به دست آمده از آزمایشات، ظرفیت باربری و رفتار نیرو-جابجایی نمونه‌ها برای ارزیابی ضریب رفتار این نوع دیوارها مشخص و آنالیز شدند. میانگین ضریب رفتار پیکربندی‌ها حدود 4 ارزیابی گردید و با مقادیر آئین‌نامه‌ای مقایسه شد. سایر مشخصه‌های لرزه‌ای نمونه‌ها‌ نظیر ضریب بزرگنمایی نیز محاسبه شدند‌ و رابطۀ ضریب بزرگنمایی با ضریب رفتار و مقاومت افزون هر گروه بدست آورده شد به‌طوریکه نسبت ضریب بزرگنمایی به ضریب رفتار را برای هر دو گروه تقریباً یکسان و برابر با مقاومت افزون (حدود 1/6) نشان داد. مقایسۀ منطقی تغییرات هر مشخصه لرزه‌ای به ازای پیکربندی‌های گوناگون بین دو گروه آشکار ساخت که حضور بار ثقلی از تأثیر تغییر پیکربندی بر مشخصه‌های‌ لرزه‌ای کاسته است. مقادیر محاسبه‌شده نشان دادند که اثر بار ثقلی روی میانگین هر یک از خصوصیات لرزه‌ای (به جز بیشینه ارتفاع مجاز) پیکربندی‌های مختلف ناچیز بوده است. علیرغم ثابت بودن ارتفاع نمونه‌ها، بیشینه ارتفاع مجاز آنها و تأثیر قابل ملاحظۀ بار ثقلی روی این مشخصۀ لرزه‌ای مطرح گردیدند و در نهایت به‌کارگیری ورق ضخیم‌تر از 0/7 میلیمتر و رعایت بیشینه ارتفاع 9/6 متر برای این سیستم سازه‌ای جدید توصیه شدند.

کلیدواژه‌ها

سازه فولادی سبک

پوشش پرسلان

اجرای خشک

ضریب رفتار

ارتفاع مجاز

ضریب بزرگنمایی

بار ثقلی

موضوعات

سازه های جدار نازک

عنوان مقاله English

An Experimental Investigation of Gravity Load Influence on the Seismic Characteristics of Porcelain-Sheathed Cold-Formed Steel Shear Walls

نویسندگان English

Caeed Reza Sowlat Tafti ¹

mohamadreza javaheri tafti ²

Hesam Varaee ³

¹ PhD Candidate, Department of Civil Engineering, Taft Branch, Islamic Azad University, Yazd, Iran

² Assistant Professor, Department of Civil Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran

³ Assistant Professor, Department of Engineering, Ale Taha Institute of Higher Education, Tehran, Iran

چکیده English

The use of porcelain with any desired pattern to cover light steel frames not only provides structural strength but also eliminates the need for facade construction. To better understand the seismic behavior of shear walls made from cold-formed steel frames with the innovative porcelain sheathing (SPS-CFS walls), eight full-scale SPS-CFS wall specimens with four different configurations and dimensions of 2.4×1.2 m² were tested under standard cyclic lateral loading in two identical groups: with gravity loading and without gravity loading. Failure modes were observed and analyzed throughout all loading stages to identify factors affecting the specimens' ductility. Using data obtained from the tests, the load-bearing capacity and force-displacement behavior of the specimens were determined and analyzed to evaluate the response modification factor (R) for this type of walls. The average R-factor for the configurations was assessed to be approximately 4 and compared with code values. Other seismic characteristics of the specimens, such as the deflection amplification factor (Cd), were also calculated. The relationship between Cd, R, and the over-strength factor (Ω0) was determined for each group. It demonstrated that the Cd/R ratio was nearly equal to Ω0 (approximately 1.6) for both grops identically. A logical comparison of variations in each seismic characteristic across different configurations between the two groups revealed that the presence of gravity loading reduced the impact of configuration changes on seismic properties. Calculated values indicated that the effect of gravity loading on the average of each seismic characteristic (except for maximum allowable height) across different configurations was negligible. Despite the specimens' fixed height, the maximum allowable height and the significant influence of gravity loading on this seismic characteristic were discussed. Finally, the use of sheet steel thicker than 0.7 mm and adherence to a maximum height of 9.6 meters were recommended for this innovative structural system.

کلیدواژه‌ها English

Light steel structure

Porcelain sheathing

Dry set

Response factor

Allowable height

Magnification ratio

Gravitational load

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