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بهبود رفتار چرخه ای قاب های فاقد استاندارد لرزه ای بتن آرمه با استفاده از ورق های FRP | ||
تحقیقات بتن | ||
مقاله 6، دوره 16، شماره 2 - شماره پیاپی 42، تیر 1402، صفحه 71-84 اصل مقاله (2.17 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22124/jcr.2023.23628.1610 | ||
نویسنده | ||
محمد حسین ثقفی* | ||
استادیار، گروه مهندسی عمران، واحد سمنان، دانشگاه آزاد اسلامی، سمنان، ایران | ||
چکیده | ||
هدف این مقاله ارزیابی رفتار قاب های بتن آرمه آسیب پذیر(فاقد جزئیات لرزه ای)، بهسازی شده با روش تقویت برشی و خمشی اتصالات تیر-ستون با استفاده از ورق های FRP است. به این منظور در فاز اول تحقیق، با توجه به تمرکز عمده مطالعات پیشین بر اتصالات دو بعدی و عدم درنظرگرفتن شرایط واقعی شامل اثر دال و تیر عرضی در اتصالات، در راستای اعمال شرایط هندسی و محدودیت های اجرایی، دراین تحقیق رفتار اتصالات با اثر دال و تیر عرضی، از طریق مطالعه آزمایشگاهی استخراج شده است. به این منظور 2 نمونه آزمایشگاهی اتصال خارجی تیر-ستون بتنی با مقیاس 2/1 ساخته شده و تحت بارگذاری سیکلی با دامنه افزایشی واقع شده اند. نمونه ها شامل یک نمونه کنترلی بدون جزئیات لرزه ای ویژه و یک نمونه دیگر شامل اتصال فاقدجزئیات لرزه ای است که با ورق های FRP بهسازی شده است. در فاز دوم تحقیق، رفتار اتصالات، قاب های 5 و 10 طبقه کنترلی و بهسازی شده در نرم افزار OpenSees مدل سازی شده و رفتار چرخه ای، شکل پذیری و استهلاک انرژی تمامی قاب ها مورد بررسی قرار گرفته است. نتایج رفتار اتصالات و قاب های بهسازی شده، نشان دهنده عدم افت مقاومت، رفتار پایدار چرخه ای، کاهش اثرات پینچینگ، بهبود سختی و ظرفیت شکل پذیری ناشی ازتغییر مود رفتاری از شکست برشی اتصالات به تشکیل مفاصل پلاستیک خمشی در تیرها، بوده است. | ||
کلیدواژهها | ||
منحنی چرخه ای آزمایشگاهی؛ اتصالات خارجی تیر-ستون؛ اثر تیرعرضی و دال؛ مدلسازی عددی؛ تحلیل غیر خطی افزاینده | ||
مراجع | ||
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آمار تعداد مشاهده مقاله: 201 تعداد دریافت فایل اصل مقاله: 166 |