ارائه معیارهایی برای تعیین سطوح عملکرد لرزه‌ای سازه‌های فولادی با سیستم باربر جانبی دوگانه با تلفیق شاخص خسارت و تحلیل دینامیکی فزاینده

نوع مقاله : Articles

نویسندگان

1 دانشگاه تربیت مدرس، تهران

2 دانشگاه اراک، اراک

چکیده

در طراحی و ارزیابی سازه‌ها بر اساس عملکرد، شناسایی سطوح عملکرد سازه در سطوح خطر لرزه‌ای مشخص از اهمیت ویژه‌ای برخوردار است. در ارزیابی عملکرد لرزه‌ای سازه‌های فولادی با سیستم باربر جانبی دوگانه متشکل از قاب خمشی و مهاربندهای همگرا با تحلیل دینامیکی فزاینده، معیارهای مقبول و پذیرفته شده‌ای جهت تعیین سطوح عملکرد وجود ندارد. در این مقاله معیارهای مناسب و ساده‌ای جهت تعیین سطوح عملکرد سازه‌های فولادی با این سیستم سازه‌ای پیشنهاد گردیده است. بدین‌منظور متوسط مقادیر شاخص خسارت یک سازه‌ی مرجع با سیستم قاب خمشی در سطوح عملکرد تعیین شده با استفاده از روش راهنمای FEMA 350 محاسبه و بر مبنای این مقادیر سطوح عملکرد 22 سازه فولادی با سیستم دوگانه با حالات مختلف نامنظمی غیر هندسی در امتداد ارتفاع با تحلیل دینامیکی فزاینده تعیین شده است. بر اساس میانگین ظرفیت تغییر مکان نسبی بین طبقه‌ای در سطوح عملکرد، معیارهای مناسب و ساده‌ای جهت تعیین سطوح عملکرد سیستم سازه‌ای مذکور معرفی گردیده که بر اساس آن مقدار دریفت 9/0 درصد برای شناسایی سطح عملکرد قابلیت بهره‌برداری بی‌وقفه و دریفت 5/7 درصد یا کاهش شیب منحنی IDA به 20 درصد مقدار آن در حالت الاستیک برای تعیین سطح عملکرد آستانه فروریزش پیشنهاد شده است.

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