مهندسی سازه و ساخت

مهندسی سازه و ساخت

رفتار لرزه‌ای دیوارهای برشی بتنی با میلگردهای دارای وصله و غلاف

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری، گروه عمران، دانشگاه آزاد اسلامی واحد مهاباد، مهاباد،ایران
2 دانشیار، دانشکده محیط‌زیست، دانشگاه صنعتی ارومیه، ارومیه، ایران.
3 استادیار گروه مهندسی عمران ، واحد مهاباد ، دانشگاه آزاد اسلامی ، مهاباد، ایران
4 استادیار، گروه عمران، دانشگاه آزاد اسلامی، واحد مهاباد، مهاباد، ایران
چکیده
دیوارهای برشی بتنی به عنوان یکی از اعضای اصلی باربر جانبی در صنعت ساختمان کاربرد گسترده ای دارند. محدودیت‌های اجرایی باعث می‌شود دیوار عموما با وصله پوششی اجرا گردد. وجود وصله پوششی امکان لغزش را برای میلگرد طولی در ناحیه اتصال فراهم می‌سازد که درصورت رخداد لغزش منجر به کاهش شکل پذیری و عملکرد لرزه‌ای نامطلوب دیوار می‌گردد. برای بررسی دقیقتر این موضوع پس از صحت سنجی نتایج عددی حاصله با نتایج آزمایشگاهی تحقیقات پیشین، رفتار 24 مدل دیوار که به لحاظ قطر میلگرد طولی، طول وصله پوششی، درصد میلگرد عرضی و جداسازی میلگرد از بتن با یکدیگر متفاوت هستند به صورت عددی و المان محدود مورد مطالعه قرار گرفت. مدلهای انتخابی با درنظر گرفتن مقاومت پیوند و لغزش در ناحیه اتصال با روش های تحلیلی عددی و المان محدود تحت بار ثقلی و بار جانبی چرخه‌ای استاتیکی مورد بررسی قرار گرفت. با مقایسه نتایج بدست آمده شامل منحنی های هیسترزیس، شکل پذیری، استهلاک انرژی، کرنش میلگرد و گسترش ترک ها با دیوار با میلگرد یکپارچه نشان داد که در دیوار های دارای وصله وجود وصله پوششی میلگرد طولی باعث لغزش میلگرد در ناحیه اتصال شده و در دیوارهای با میلگرد قطر 18 و 20 میلیمتر شکل پذیری در حدود 2 برابر کاهش یافت. نتایج نشان داد شکل پذیری دیوارهای دارای وصله را می‌توان با استفاده از روش غلافگذاری تا حد 50% افزایش داد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Seismic behavior of concrete shear wall with lap-spliced rebar and sleeve

نویسندگان English

Jalal Hasankhani 1
Erfan Shafei 2
Reza SojoudiZadeh 3
Seyed Jamil Ghaderi 4
1 PhD Candidate, Department of Civil Engineering, Mahabad Branch, Islamic Azad University,Mahabad, Iran
2 Associate Professor, Department of Environmental Engineering, Urmia University of Technology, Urmia, Iran.
3 Assistant Professor, Department of Civil Engineering, Mahabad Branch Islamic Azad University, Mahabad, Iran
4 Assistant Professor, Department of Civil Engineering, Mahabad Branch Islamic Azad University, Mahabad, Iran
چکیده English

Reinforced concrete shear walls have a wide range of applications as one of the main lateral load-bearing elements in the construction industry. Implementation constraints often require the use of longitudinal rebar lap-spliced. The presence of rebar lap-spliced allows for longitudinal rebar slippage in the connection zone, which, if it occurs, leads to a reduction in ductility and undesirable seismic performance of the wall. To further investigate this issue, after validating the numerical results with obtained previous laboratory experiments, the behavior of 24 wall models with different longitudinal rebar diameters, lap-spliced lengths, percentage of longitudinal rebar, and rebar debonding were studied numerically and using finite element analysis. The selected models, considering bond strength and slippage at the connection zone, were examined under gravity and cyclic lateral loading using numerical and finite element methods. By comparing the obtained results, including hysteretic curves, ductility, energy dissipation, rebar strain, and crack propagation, with walls using continuous rebar, it was demonstrated that the presence of lap-spliced in the wall causes rebar slippage in the connection zone. Additionally, in walls with 18mm and 20mm rebars diameter, ductility was reduced by approximately 2 times. The results indicated that the ductility of walls with lap-spliced can be increased by up to 50% using debonding methods.

کلیدواژه‌ها English

reinforced concrete shear wall
seismic performance
over-lapping rebar lap splice
sleeving
rebar bond-slip
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  • تاریخ دریافت 12 شهریور 1402
  • تاریخ بازنگری 05 آذر 1402
  • تاریخ پذیرش 08 دی 1402