مهندسی سازه و ساخت

مهندسی سازه و ساخت

یک روش طراحی کاربردی مبتنی بر سطح عملکرد برای بهسازی لرزه‌ای سازه‌های بتنی بلندمرتبه مجهز به دیوار برشی فولادی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 استادیار، دانشکده مهندسی عمران، موسسه آموزش عالی اشراق، بجنورد، ایران
2 مهندسی عمران (ژئوتکنیک)، دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی شیراز، شیراز، ایران
3 دانش آموخته کارشناسی ارشد سازه، دانشکده مهندسی عمران، دانشگاه آزاد اسلامی، واحد شوشتر، شوشتر، ایران
4 استادیار، گروه مهندسی عمران، دانشکده فنی و مهندسی خوی، دانشگاه صنعتی ارومیه، ارومیه، ایران
چکیده
استفاده از سیستم دیوار برشی فولادی (SSW) برای بهسازی عملکرد سازه‌های فولادی بسیار مرسوم است؛ با این حال استفاده از این سیستم برای تقویت سازه‌های بتنی چندان مورد توجه قرار نگرفته است. هدف از مقاله حاضر، ارائه یک روش کاربردی مبتنی بر سطح عملکرد برای بهسازی لرزه‌ای قاب‌های بتنی خمشی بلندمرتبه مجهز به SSW می‌باشد. بدین منظور، ابتدا قاب‌های بتنی 15، 20 و 25 طبقه در دو حالت مبنا و بهسازی شده با SSW در نرم‌افزار ETABS مد‌لسازی گردید. پس از طراحی اولیه قاب‌ها و فراخوانی آن‌ها در نرم‌افزار Opensees، رفتار لرزه‌ای آن‌ها با انجام تحلیل تاریخچه زمانی غیرخطی تحت اثر زلزله ارزیابی شد. توزیع جابجایی نسبی (دریفت) و نیروی برشی میان‌طبقه‌ای قاب‌ها در دو حالت مذکور و در سطوح عملکرد ایمنی جانی (LS) و آستانه فروریزش (CP) مطابق با محدودیت‌های آئین‌نامه‌ای بررسی شد. نتایج نشان داد که روش بهسازی لرزه‌ای پیشنهادی برای قاب‌های بتنی، با افزایش مقاومت و سختی جانبی، علاوه بر یکنواخت نمودن توزیع جابجایی نسبی (دریفت) در راستای ارتفاع سازه، قادر به کاهش قابل توجه بیشینه دریفت میان‌طبقه‌ای (بیش از 60%) می‌باشد. همچنین ظرفیت برشی میان‌طبقه‌ای برای قاب‌های بهسازی شده درحدود 20% تا 30% در سطوح عملکرد مختلف افزایش یافت. به‌عنوان یک نتیجه کلی مشخص شد که قاب‌های بتنی بلندمرتبه در حالت مبنا به‌دلیل نداشتن یک سیستم مقاوم باربر جانبی، قادر به جذب نیروهای افقی زلزله نمی‌باشند. ازاین‌رو حداکثر ظرفیت پلاستیک قاب‌ها برای مستهلک نمودن انرژی ورودی بسیج نمی‌گردد. این در حالی است که بهسازی SSW، توزیع غیریکنواخت دریفت و نیروی برشی میان‌طبقه‌ای منطبق بر مقادیر بیشینه مجاز آئین‌نامه‌ای، به‌طور مؤثرتری تغییر می‌کند.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

A practical performance level-based design method for seismic retrofitting of high-rise flexural concrete structures equipped with steel shear walls

نویسندگان English

Saeed Lari 1
Meisam Mahboubi Niazmandi 2
Vahid Hatami Dezdarani 3
Sajjad Gholipour 4
1 Assistant Professor, Department of Civil Engineering, Eshragh Institute of Higher Education, Bojnourd, Iran
2 Ph.D. in Civil (Geotechnical) Engineering, Department of Civil and Environmental Engineering, Shiraz University of technology, Shiraz, Iran
3 Ms.C Graduated, Department of Civil Engineering, Islamic Azad University, Shoushtar Branch, Shoushtar, Iran
4 Assistant Professor, Department of Civil Engineering, Engineering Faculty of Khoy, Urmia University of Technology, Urmia, Iran
چکیده English

Using steel shear wall (SSW) system is very common to improve the performance of steel structures; However, the use of this system to strengthen concrete structures has not been given much attention. The present paper aimed to proposed a practical performance-based level method for seismic improvement of high-rise flexural concrete frames equipped with SSW. To this end, 15, 20 and 25-story high-rise concrete frames in both base and retrofitted modes with SSW system have been modeled in ETABS. After calling them in Opensees, their seismic behavior has evaluated by performing nonlinear time history analysis under earthquakes. The inter-story drift and shear force of the frames have investigated in two abovementioned modes at the levels of life safety performance (LS) and collapse prevention (CP) according to guidelines limitations. The results showed that concrete frames equipped with SSW as an intelligent system, by increase in the lateral stiffness, in addition to uniformizing the drift distribution along the height, can significantly reduce the maximum middle story drift (more than 60%). Also, the shear capacity of the middle stories for the retrofitted concrete frames increased about 20% to 30% at different performance levels. Consequently, it was found that high-rise concrete frames in the base modes, due to the lack of a strong lateral load-bearing system, are not able to absorb the horizontal forces applied by the earthquake. Also, frames do not have a good ability to present a hysterical behavior of energy. Therefore, the maximum plastic capacity of the frames is not mobilized to dissipate the input energy. However, by using the SSW system, the non-uniform drift distribution and the shear force of the middle stories change more effectively in line with the height of the structure in accordance with the maximum allowable drift values of the regulations.

کلیدواژه‌ها English

Practical seismic retrofitting
High-rise flexural concrete frames
Steel shear wall (SSW) system
Performance levels
Time history analysis
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  • تاریخ دریافت 10 تیر 1403
  • تاریخ بازنگری 02 آبان 1403
  • تاریخ پذیرش 13 آذر 1403