بررسی تاثیر شکل هندسی شکاف‌ها بر رفتار لرزه‌ايی میراگر شکاف‌دار فولادی در مهاربند همگرا
محورهای موضوعی : آنالیز سازه - زلزله
شهرزاد پاهنگ
1
,
لیلا حسین زاده
2
1 - گروه مهندسی عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
2 - گروه مهندسی عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
کلید واژه: میراگر شکاف دار, شکل هندسی شکاف, مهاربند همگرا, سختی, مقاومت, جذب انرژی,
چکیده مقاله :
با توجه به چالش‌های مربوط به بهبود مقاومت ساختمان‌ها در برابر ارتعاشات و بهینه‌سازی طراحی آن‌ها در برابر زلزله، در سال‌های اخیر روش‌های متعددی توسعه یافته است. یکی از این روش‌ها استفاده از میراگرهای فولادی است. در میان انواع میراگرها، میراگرهای شکاف دار به عنوان یک جایگزین نوید بخش برای تکنیک‌های متداول مورد استفاده در صنعت ساخت و مهندسی سازه ظاهر شده‌اند. عملکرد این میراگرها می‌تواند تحت تأثیر عوامل مختلفی از جمله ویژگی‌های هندسی و نحوه قرارگیری شکاف‌ها قرار گیرد.این مطالعه به بررسی تأثیر هندسه شکاف بر رفتار لرزهای میراگرها می‌پردازد. به این منظور، در حالی که مساحت شکاف ثابت نگه داشته شده است، سه شکل مختلف شکاف لوبیایی، بیضی، و لوزی مورد تحلیل قرار گرفتند. میراگرها با این اشکال شکاف در سه ارتفاع مختلف ۱۴۰ میلیمتر، ۲۱۰ میلیمتر، و ۲۸۰ میلیمتر مدل‌سازی شدند. نتایج نشان می‌دهد که شکل شکاف به طور قابل توجهی بر پارامترهای کلیدی لرزهای مانند سختی، مقاومت نهایی و جذب انرژی تأثیر می‌گذارد. در میان اشکال بررسی شده، شکافهای لوزی شکل عملکرد برتری نسبت به شکافهای لوبیایی و بیضی نشان دادند. علاوه بر این، افزایش ارتفاع میراگر به کاهش عملکرد لرزهای منجر شد که سختی، بیشترین تأثیر را تجربه کرد.
Considering the challenges related to improving buildings' resistance to vibrations and optimizing their design against earthquakes, several methods have been developed in recent years. One such method involves the use of steel dampers. Among them, slotted dampers have emerged as a promising alternative to conventional techniques used in the construction and structural engineering industries. The performance of these dampers can be influenced by various factors, including their geometric properties and the arrangement of the slots.This study investigates the effect of slot geometry on the seismic behavior of the dampers. To this end, while keeping the slot area constant, three different slot shapes, bean, oval, and rhombus, were analyzed. Dampers with these slot shapes were modeled at three different heights: 140 mm, 210 mm, and 280 mm. The results indicate that the slot shape significantly influences key seismic parameters such as stiffness, ultimate strength, and energy absorption. Among the shapes studied, the rhombus-shaped slots demonstrated superior performance compared to the bean- and oval-shaped ones. Furthermore, an increase in damper height led to a decrease in seismic performance, with stiffness experiencing the most significant.
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