مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی آزمایشگاهی اثر طول وصله‌ بر عملکرد لرزه‌ای المان‌های مرزی دیوار برشی بتن‌آرمه مسلح شده با میلگردهای S500

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری، گروه عمران، دانشکده فنی و مهندسی، دانشگاه ارومیه، ارومیه، ایران
2 استاد، گروه عمران، دانشکده فنی و مهندسی، دانشگاه ارومیه، ارومیه، ایران
3 استادیار، گروه عمران، دانشکده فنی و مهندسی، دانشگاه ارومیه، ارومیه، ایران
4 پژوهشگر پسادکتری، دانشگاه تبریز، تبریز، ایران
چکیده
زلزله‌های اخیر، آسیب‌پذیری دیوارهای برشی بتن‌آرمه با تراکم کم آرماتور را آشکار ساخته‌اند؛ به‌طوری‌که مکانیزم‌های شکست رایجی نظیر گسیختگی آرماتورها و کمانش خارج از صفحه در المان‌های مرزی به‌کرات مشاهده شده است. در پاسخ به این چالش، آیین‌نامه‌های معتبری نظیر ACI 318 و NZS 3101 در نسخه‌های اخیر، نسبت حداقل آرماتور طولی در المان‌های مرزی را افزایش داده‌اند. با این وجود، تأثیر طول وصله بر رفتار این المان‌ها هنوز به طور جامع مورد مطالعه قرار نگرفته است. پژوهش حاضر به بررسی آزمایشگاهی اثر طول وصله و نوع آرماتور بر مکانیزم‌های شکست المان‌های مرزی می‌پردازد. برنامه آزمایشی شامل پنج نمونه با طول وصله متفاوت بود که سه نمونه تحت بارگذاری یکنوا و دو نمونه تحت بارگذاری چرخه‌ای قرار گرفتند. نتایج موید آن است که در آزمایشات تحت بار یکنوا در دو نمونه‌ گسیختگی آرماتور در بر فونداسیون و تنها در یک نمونه در انتهای وصله رخ داده و وقوع گسیختگی در انتهای وصله منجر به کاهش حدود 30 درصدی ظرفیت تغییرشکل محوری المان مرزی شده است. عدم گسیختگی آرماتور در انتهای وصله در دو نمونه نشانگر فعال نشدن اثر وصله در این دو آزمایش است. این در حالیست که در هر دو نمونه آزمایش شده تحت بار چرخه‌ای شکست در انتهای وصله رخ داده و کاهش ظرفیت تغییرشکل محوری باز هم بیشتر است. نتایج نشانگر اثر مخرب وصله روی ظرفیت تغییرشکل محوری المان‌های مرزی بوده و در ضمن نشان می‌دهد که ارزیابی اثر وصله با انجام آزمایش تحت بارگذاری یکنوا منجر به نتایج گمراه‌کننده‌ای می‌گردد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

An Experimental Investigation into the Effects of Splice Length on the Seismic Performance of RC Shear Wall Boundary Elements Reinforced with S500 Rebars

نویسندگان English

Ramin Mozaffari 1
Saeed Tariverdilou 2
Changiz Gheyratmand 3
Mojtaba Razavi 4
1 PhD Candidate, Department of Civil Engineering, Faculty of Engineering, Urmia University, Urmia, Iran
2 Proffessor, Department of Civil Engineering, Faculty of Engineering, Urmia University, Urmia, Iran
3 , Department of Civil Engineering, Faculty of Engineering, Urmia University, Urmia, Iran
4 Postdoctoral Researcher, Department of Civil Engineering, University of Tabriz, Tabriz, Iran
چکیده English

Recent earthquakes have revealed the vulnerability of reinforced concrete shear walls with low reinforcement ratios, where common failure mechanisms such as fracture of reinforcement and out-of-plane buckling in boundary elements have been frequently observed. In response to this challenge, reputable codes such as ACI 318 and NZS 3101 have increased the minimum longitudinal reinforcement ratio in boundary elements in their recent editions. However, the effect of splice length on the behavior of these elements has not yet been comprehensively studied. The present research investigates the experimental effect of splice length and reinforcement type on the failure mechanisms of boundary elements. The experimental program included five specimens with different splice lengths, three of which were subjected to monotonic loading and two to cyclic loading. The results indicate that in monotonic loading tests, reinforcement fracture occurred at the foundation interface in two specimens and only at the end of the splice in one specimen. The occurrence of fracture at the end of the splice led to an approximately 30% reduction in the axial deformation capacity of the boundary element. The absence of reinforcement fracture at the end of the splice in two specimens indicates that the splice effect was not activated in these two tests. In contrast, in both specimens tested under cyclic loading, failure occurred at the end of the splice, and the reduction in axial deformation capacity was even greater. The results demonstrate the detrimental effect of splices on the axial deformation capacity of boundary elements and further indicate that evaluating the effect of splices through monotonic loading tests leads to misleading results.

کلیدواژه‌ها English

Boundary Elements
Concrete Shear Walls
Lap Splice Length
Rebar Fracture
Seismic Performance
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  • تاریخ دریافت 11 تیر 1404
  • تاریخ بازنگری 05 شهریور 1404
  • تاریخ پذیرش 24 شهریور 1404