بررسی عددی تاثیر لینک‌های برشی دارای فولاد حدتسلیم پایین بر عملکرد لرزه‌ای قاب‌های بتنی

چراغی, کامبیز; رسولی‌تبار, مهرداد; خالقی, رضا

doi:10.22065/jsce.2025.519992.3714

بررسی عددی تاثیر لینک‌های برشی دارای فولاد حدتسلیم پایین بر عملکرد لرزه‌ای قاب‌های بتنی

نوع مقاله : علمی - پژوهشی

نویسندگان

کامبیز چراغی ¹

مهرداد رسولی‌تبار ²

رضا خالقی ³

¹ -کارشناس ارشد مهندسی سازه، دانشکده فنی مهندسی، دانشگاه رازی، کرمانشاه، ایران

² استادیار گروه مهندسی عمران، واحد اسلام آباد غرب، دانشگاه آزاد اسلامی، اسلام آباد غرب، ایران.

³ استادیار گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران.

10.22065/jsce.2025.519992.3714

چکیده

یکی از مؤثرترین راه‌کارهای کنترل پاسخ لرزه‌ای سازه‌ها، استفاده از میراگرهای تسلیم‌شونده است که با ورود سریع به ناحیه پلاستیک، سهم عمده‌ای از انرژی زلزله را جذب می‌کنند. در این تحقیق، تأثیر لینک‌های برشی بر عملکرد سازه‌های بتنی به‌صورت عددی مورد بررسی قرار گرفت. در گام نخست، مدل عددی با استفاده از نتایج دو نمونه آزمایشگاهی صحت‌سنجی شد. برای محاسبه سختی الاستیک و مقاومت حداکثر لینک برشی،18تحلیل عددی انجام شد و دیاگرام نیرو-جابجایی آن استخراج گردید. در ادامه، معادلات تقریبی برای سختی الاستیک و مقاومت حداکثر لینک برشی، با استفاده از روش برازش منحنی مبتنی بر نتایج عددی توسعه یافتند. سپس تأثیر این لینک‌های برشی بر رفتار قاب‌های بتنی با استفاده از روش بارافزون ارزیابی شد. متغیر اصلی مدل، نسبت سختی لینک برشی به سختی قاب تنها بود. خروجی‌های مدل شامل سختی و مقاومت جانبی، ظرفیت جذب انرژی و شکل‌پذیری قاب بودند. نتایج نشان دادند که اگر نسبت سختی الاستیک لینک برشی به قاب اولیه کمتر از ۵۰ باشد، افزایش سختی و مقاومت قاب مجهز به لینک تقریباً برابر با مجموع سختی و مقاومت لینک و قاب اولیه خواهد بود. همچنین، هنگامی که این نسبت برابر با ۵۰ باشد، شکل‌پذیری و ظرفیت جذب انرژی قاب به ‌ترتیب ۳ و 8/2 برابر افزایش می‌یابد. این نتایج بیانگر آن است که لینک‌های برشی نه تنها باعث بهبود رفتار لرزه‌ای قاب‌های بتنی می‌شوند، بلکه به‌عنوان گزینه‌ای مؤثر برای ارتقاء عملکرد سازه‌ها در طراحی مقاوم در برابر زلزله قابل مطرح شدن هستند.

کلیدواژه‌ها

میراگر تسلیمی

لینک برشی

قاب بتنی

تحلیل عددی

تحلیل بارافزون

رفتار لرزه‌ای

جذب انرژی

موضوعات

روش های عددی در مهندسی سازه

عنوان مقاله English

Numerical Investigation of the Effect of Shear Links with Low Yield Strength Steel on the Seismic Performance of Concrete Frames

نویسندگان English

Kambiz Cheraghi ¹

Mehrdad RasouliTabar ²

reza khaleghi ³

¹ Department of Civil Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran.

² Assistant professor, Department of Civil Engineering, IsG.C., Islamic Azad University, Islamabad Gharb, Iran.

³ Assistant professor, Department of Civil Engineering, Ker.C., Islamic Azad University, Kermanshah, Iran.

چکیده English

One of the most effective strategies for controlling the seismic response of structures is the use of yielding dampers, which, by quickly entering the plastic region, absorb a significant portion of the earthquake energy. In this study, the effect of shear links on the performance of concrete structures was investigated numerically. First, the numerical model was validated using the results of two experimental specimens. To calculate the elastic stiffness and the maximum strength of the shear link, 18 numerical analyses were conducted, and the corresponding force-displacement diagrams were extracted. Subsequently, approximate equations for the elastic stiffness and maximum strength of the shear link were developed through curve fitting based on the numerical results. The effect of these shear links on the behavior of concrete frames was then evaluated using the pushover analysis method. The main variable of the model was the ratio of the stiffness of the shear link to the stiffness of the bare frame. The model outputs included lateral stiffness and strength, energy absorption capacity, and ductility of the frame. The results indicated that if the ratio of the elastic stiffness of the shear link to the initial frame is less than 50, the increase in the stiffness and strength of the frame equipped with the link is approximately equal to the sum of the stiffness and strength of the link and the initial frame. Furthermore, when this ratio is equal to 50, the ductility and energy absorption capacity of the frame increase by factors of 3 and 2.8, respectively. These results suggest that shear links not only improve the seismic behavior of concrete frames but also present an effective option for enhancing structural performance in earthquake-resistant design.

کلیدواژه‌ها English

Yielding Damper

Shear Link

Concrete Frame

Numerical Analysis

Pushover Analysis

Seismic Performance

Energy Dissipation

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