نشریه مهندسی عمران امیرکبیر

نشریه مهندسی عمران امیرکبیر

مقایسه روش متداول و روش انرژی در ارزیابی شکنندگی قاب خمشی فولادی

نوع مقاله : مقاله پژوهشی

نویسندگان
گروه مهندسی عمران، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران.
چکیده
روش های تولید منحنی های شکنندگی در ساختمان ها عموما مبنی بر ماکزیمم دریفت طبقات استوار است. مرادی و عبدالمحمدی در سال 2020 روشی مبتنی بر انرژی را ارائه دادند. آنها بیان کردند با در نظر گرفتن انرژی کرنشی پلاستیک در سازه های بلند مرتبه به عنوان پارامتر تقاضای مهندسی نیز می توان شکنندگی را استخراج کرد. هدف از این تحقیق مقاسه روش مبتنی بر ماکزیمم دریفت طبقات و روش مبتنی بر انرژی در سازه ختمان های 4، 8 و 12 طبقه فولادی است. برای این منظور سازه ها پس از طراحی اولیه به صورت غیر خطی در نرم افزار PERFORM-3D مدلسازی شده و در معرض 20 رکورد حوزه نزدیک قرار گرفتند. منحنی هیا دینامیکی افزاینده (IDA) با دو روش انرژی و ماکزیمم دریفت استخراج و با یکدیگر مقایسه شده است. در نهایت با محاسبه حالات حدی انرژی در دو سطح ایمنی جانی و آستانه فروریزش، منحنی های شکنندگی در این دو سطح به همراه سطح الاستیک محاسبه و با روش مبتنی بر ماکزیمم دریفت مقایسه شده است. نتایج نشان داده است در سازه های کوتاه و میان مرتبه روش مبتنی بر ماکزیمم دریفت شکنندگی را به صورت محافظه کارانه تر نسبت به روش انرژی ارائه می دهد. به عنوان مثال احتمال فراگذشت 50% از سطح LS در روش انرژی برای سازه های 4، 8 و 12 طبقه به ترتیب در بیشینه شتاب 1g، 1/25g و1/45g در روش متداول به ترتیب در بیشینه شتاب 0/65g، 0/9g و 1g رخ داده است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Comparison of Conventional and Energy-Based Methods in Fragility Assessment of Steel Moment-Resisting Frames

نویسندگان English

Hossein Dehrouyeh
Ali Delnavaz
reza Farokhzad
mehran seyed razaghi
PHD candidate, Department of Civil Engineering, Qa. c., Islamic Azad University, Qazvin, Iran.
چکیده English

Methods for generating fragility curves in buildings are generally based on the maximum inter-story drift. Moradi and Abdolmohammadi (2020) proposed an energy-based method. They stated that by considering the plastic strain energy in high-rise structures as an engineering demand parameter, fragility can also be derived. The aim of this study is to compare the maximum inter-story drift-based method and the energy-based method in 4-, 8-, and 12-story steel buildings. For this purpose, after initial design, the structures were modeled nonlinearly in PERFORM-3D software and subjected to 20 near-fault ground motion records. Incremental Dynamic Analysis (IDA) curves were extracted using both the energy and maximum drift methods and compared with each other. Finally, by calculating the energy limit states at two performance levels—Life Safety (LS) and Collapse Prevention (CP)—the fragility curves at these two levels, along with the elastic level, were computed and compared with the maximum drift-based method. The results showed that in low- and mid-rise structures, the maximum drift-based method provides a more conservative fragility estimation compared to the energy-based method. For example, the probability of exceeding 50% of the LS level in the energy-based method for 4-, 8-, and 12-story buildings occurs at peak accelerations of 1g, 1.25g, and 1.45g, respectively, while in the conventional method this occurs at peak accelerations of 0.65g, 0.9g, and 1g, respectively.

کلیدواژه‌ها English

Fragility
Energy-based method
Drift-based method
Incremental Dynamic Analysis (IDA) curves
Steel moment-resisting frame
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