مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی تأثیر استفاده از بازشوهای نواری در عملکرد سازه و المان های مرزی دیوارهای برشی فولادی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 استاد، دانشکده مهندسی عمران، دانشگاه صنعتی شریف، تهران، ایران
2 کارشناس ارشد، دانشکده مهندسی عمران، دانشگاه صنعتی شریف، تهران، ایران
3 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه صنعتی شریف، تهران، ایران
چکیده
دیوارهای برشی فولادی با طراحی مطلوب به عنوان یک سیستم باربر جانبی کارآمد در سازه‌ها تلقی می‌شوند و یکی از مسائل مهم در این سیستم، ضرورت وجود بازشوها بوده که متأثر از دلایل اجرایی، محدودیت‌های معماری و الزامات سازه‌ای است. در این پژوهش، با ایجاد بازشو به‌صورت نوارهایی در کناره‌های دیوار برشی فولادی و جدا کردن بخشی از اتصال آن به ستون‌ها و تیرها، میزان اثرگذاری آن در تغییرات تنش‌های اعمالی به ستون‌های کنار دیوار و نیز اثر آن بر عملکرد لرزه‌ای سازه بررسی می‌شود. همچنین، برای بررسی تأثیر ایجاد بازشوهای نواری، بازشوهای مستطیلی با نسبت ابعادی متفاوت در چارچوب 25 مدل مختلف و با شرایط اتصال گیرداری و مفصلی درنظر گرفته‌شده و سپس نسبت‌های مقاومت خمشی، نیروهای محوری و برشی و تغییرمکان نسبی جانبی سازه‌ها با یکدیگر مقایسه شده است. نتایج مدلسازی‌ها نشان می‌دهد بازشوهای افقی تأثیر مخرب‌تری بر روی ستون‌ها و بازشوهای قائم اثر مخرب‌تری بر روی تیرها خواهند داشت. با تضعیف سیستم باربر جانبی با تعبیه بازشوهای نواری، تغییرات در تنش حاصل از نیروی محوری، لنگر و اندرکنش این دو در ستون‌ها، نتایج متفاوتی به همراه دارد، به‌طوری‌که در سازه با سیستم دوگانه، تضعیف دیوار برشی منجر به اضافه شدن نیروی بیشتری به قاب خمشی و به تبع آن، افزایش تنش‌های مذکور در ستون‌ها می‌شود و در اتصال مفصلی، به‌طورکلی تفاوت تنش‌های ستون محسوس نمی‌باشد. برای بازشوهای قائم، نسبت جابه‌جایی جانبی نسبی دیوارهای با بازشو به دیوار بدون بازشو در حالت اتصال گیرداری و مفصلی به ترتیب در بازه 02/1 تا 71/1 و 05/1 تا 09/3 بوده و برای بازشوهای افقی مقادیر فوق به ترتیب 22/1 تا 36/6 و 15/1 تا 98/9 می‌باشد و بیشینه مقادیر مربوط به بازشوهای سرتاسری است. همچنین، استفاده از بازشو با مساحت کمتر از 25/0 مترمربع منجر به کاهش محسوس عملکرد لرزه‌ای سازه نخواهد شد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

An investigation into the effects of strip openings on the structural performance of perforated steel plate shear walls

نویسندگان English

Alireza Khaloo 1
Sina Kavei 2
Hatef Abdoos 3
1 Professor, Department of Civil Engineering, Sharif University of Technology, Tehran, Iran
2 Master of Structural Engineering, Department of Civil Engineering, Sharif University of Technology, Tehran, Iran
3 PhD student, Department of Civil Engineering, Sharif University of Technology, Tehran, Iran
چکیده English

Steel Plate Shear Walls (SPSWs) are being increasingly utilized as one of the efficient lateral load-resisting systems in seismic zones. Adopting openings in the infill plate of SPSWs is sometimes essential owing to the architectural requirements, structural reasons, as well as constructional limitations. This study aims at investigating the influence of strip openings on the structural performance of perforated steel plate shear walls with different infill plate boundary conditions. In this regard, a variety of perforated SPSWs with vertical and horizontal strip openings are designed and then numerically simulated possessing different aspect ratios and opening features. The effects of the dimensions and orientations of the strip openings are evaluated through response parameters in terms of drift and stress ratios corresponding to the flexural strength, axial and shear forces. According to the simulation results, in general, introduction of the horizontal and vertical openings attenuates the stiffness of perforated SPSWs, and in turn, the drift response of the structure becomes more pronounce. A non-dimensionalized parameter is also introduced to indicate how the boundary conditions and opening dimensions affect the drift response of the structure. The results indicate that an increase in the width and length of the opening can exacerbate the induced stress values corresponding to the axial forces, flexural moments, and their combination in the columns and beams. In addition, the use of perforated SPSW with opening of less than 0.25m2 can offer similar seismic performance as compared to that of SPWS with infill plate and without opening.

کلیدواژه‌ها English

Steel Plate shear wall
Strip opening
Numerical modelling
Lateral bearing capacity
Boundary elements
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  • تاریخ دریافت 09 مرداد 1402
  • تاریخ بازنگری 13 مهر 1402
  • تاریخ پذیرش 30 آبان 1402