تاثیر عدم‌قطعیت‌های سازه‌ای دیوار برشی فولادی بر عملکرد لرزه‌ای قاب خمشی بهسازی‌شده

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری، دانشگاه سمنان، سمنان، ایران

2 دانشیار، دانشگاه سمنان، سمنان، ایران

چکیده

عدم‌قطعیت‌ها که در برآورد مسائل مهندسی سازه اجتناب‌ناپذیر هستند باعث افزایش هزینه‌های بهسازی، نتایج نادرست ارزیابی لرزه‌ای و ایجاد محافظه‌کاری در معیارهای پذیرش سطوح عملکرد سازه می‌شوند. در نظر گرفتن عدم‌قطعیت‌ها و کمی‌سازی آن‌ها در طراحی و بهسازی سازه‌ها باعث کاهش محافظه‌کاری‌های موجود شده و می‌تواند منجر به طراحی و بهسازی اقتصادی سازه‌ها گردد. در بهسازی لرزه‌ای سازه‌ها عدم‌قطعیت‌ها بر روی سازه موجود مطالعه شده و دستورالعمل‌های بهسازی توسط ضرایبی این عدم‌قطعیت‌ها را در نظر گرفته‌اند. افزودن عضو ثانویه برای بهسازی سازه موجود، ممکن است عدم‌قطعیت‌هایی را به‌همراه خود وارد محاسبات کرده و بر روی نتایج قابلیت اعتماد مؤثر باشد. ازاین‌رو در این مقاله، با هدف کمی‌سازی عدم‌قطعیت‌های دیوار برشی فولادی به بحث قابلیت اعتماد سازه بهسازی شده با دیوار برشی فولادی پرداخته‌شده است. سازه مورد مطالعه، سازه نه طبقه قاب خمشی فولادی می‌باشد که توسط دیوار برشی فولادی بهسازی شده است. برای مدل‌سازی و تحلیل سازه از نرم‌افزار اپنسیس استفاده‌شده است. سازه قبل و بعد از بهسازی و با توجه به متغیرهای احتمالاتی در نظر گرفته‌شده برای دیوار برشی فولادی، تحت تحلیل دینامیکی افزایشی قرارگرفته است. نتایج نشان دادند که  تنش تسلیم و سختی الاستیک دیوار برشی فولادی نسبت به سایر متغیرهای احتمالاتی بیشترین تاثیر را بر روی پاسخ سازه دارند. بر اساس نتایج حاصله، در نظر گرفتن عدم‌قطعیت‌ها باعث افزایش احتمال شکست شده و درنتیجه محافظه‌کاری موجود و هزینه‌های بهسازی کاهش‌یافته است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Structural Uncertainties of Steel Shear Wall on Seismic Performance of Rehabilitated Moment Frame

نویسندگان [English]

  • Mahdiye Maddahi 1
  • Mohsen Gerami 2
  • Hossein Naderpour 2
1 PhD Student, department of earthquake engineering, Semnan university, Semnan, Iran
2 Associate professor, department of earthquake engineering, Semnan university, Semnan, Iran
چکیده [English]

Uncertainties are inevitable in the estimation of structural engineering issues and increase the cost of retrofitting. In the presence of uncertainties, the results of seismic evaluation are incorrect and create conservatism in acceptance criteria at structural performance levels. Considering and quantification of uncertainties in design and rehabilitation of structures reduces the existing conservatism and can lead to the economic design and rehabilitation of structures. In the seismic rehabilitation of structures, uncertainties have been studied on existing structures and have been applied by coefficients in guidelines. Adding a secondary system to rehabilitate of existing structure can enter uncertainties into the computation and can be effective for results of reliability. Therefore, in this study, reliability of rehabilitated steel moment frame with steel shear wall has been discussed in order to quantify the uncertainty of the steel shear wall. The selected structure is a nine-storey steel moment frame of SAC project, which was rehabilitated by steel shear wall. The studied structures were analyzed pre- and post-rehabilitation, with probabilistic variables considered for steel shear wall by OpenSees software. Based on results of incremental dynamic analysis and obtained fragility curves, the values of the reliability index have been obtained for the rehabilitated structure in the presence of uncertainties. Results showed that considering of uncertainties and reducing them can reduce the existing conservatism and the cost of rehabilitation.

کلیدواژه‌ها [English]

  • Seismic Rehabilitation
  • Steel Shear Wall
  • Uncertain
  • Sensitivity analysis
  • Incremental Dynamic Analysis
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