بررسی رفتار دیوار‌های مرکزگرای پایه‌-گهواره‌ای و گهواره‌ای دوگانه تحت شتاب‎نگاشت‎های لرزه‌ای دور و نزدیک گسل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران

2 دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران. ایران

چکیده

 در این تحقیق، به بررسی رفتار لرز‌ه‌ای دیوارهای بتنی مرکزگرای گهواره‌ای در دو حالت پایه- گهواره‎ای و گهواره‎ای دوگانه پرداخته شد. برای تحلیل‎های لرزه‎ای از سه مجموعه شتاب‌نگاشت شامل 22 شتاب‎نگاشت دور از گسل، 14 شتاب‎نگاشت نزدیک گسل دارای پالس و 14 شتاب‎نگاشت نزدیک گسل بدون پالس استفاده ‌شد. به این منظور، سازه‎های 8، 12، 16 و 20 طبقه تحت اثر شتاب‌نگاشت‎های مزبور مورد تحلیل‌ تاریخچه - زمانی غیرخطی قرار گرفتند. براساس مساحت کابل پیش‎تنیده مورداستفاده در دیوار، سه نوع دیوار گهواره‌ای دوگانه در نظرگرفته‌شد و رفتار لرزه‎ای آن با رفتار دیوار پایه - گیردار و پایه - گهواره‌ای مقایسه شد. مدل‌سازی‎ها در نرم‌افزار OpenSEES و به‌صورت دوبعدی انجام‌شدند. برای صحت‌سنجی مدل‎سازی، از داده‎های آزمایشگاهی موجود در خصوص دیوارهای پایه - گیردار و پایه - گهواره‌ای استفاده شد. به‌منظور مطالعه‌ی تطبیقی سازه‌های موردنظر، ضرایب مطلوبیت براساس کاهش اثرات مودهای بالا و کاهش جابه‌جایی‌های نسبی پس‌ماند تعریف شد. نتایج نشان داد، به‌طور کلی شاخص مطلوبیت دیوارهای گهواره‌ای دوگانه بیشتر از سایر سیستم‎های موردمطالعه در این تحقیق است. علاوه‌بر این، کاهش مساحت کابل در بلوک تحتانی دیوارهای گهواره‌ای دوگانه در کاهش اثرات مودهای بالا بسیار مؤثر است.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of the Behavior of Self-Centering Base- and Double- Rocking Walls Subjected to Far-Field and Near-Field Earthquakes

نویسندگان [English]

  • Esmaeil Mohammadi Dehcheshmeh 1
  • Vahid Broujerdian 2
1 , Iran University of Science and Technology, Tehran, Iran
2 School of Civil Engineering,, Iran University of Science and Technology
چکیده [English]

In the present study, the seismic behavior of self-centering rocking wall systems in both types of base-rocking and double-rocking was investigated. To conduct seismic analyses, three sets of seismic records were considered including 22 Far-Field (FF) ground motions and 28 Near-Field (NF) ground motions that half of which are Pulse-like (Pulse). These ground motions were used for nonlinear time-history analysis of structures with 8, 12, 16 and 20 floors. Based on the area of prestressing cables, three types of double-rocking walls are considered and compared with the base-rocking and the fixed base walls. Numerical modelling was conducted via OpenSEES software in two-dimensional space. For the sake of validation, the available experimental data of base rocking and fixed base walls was used. To compare the seismic performance of the structures, some desirability coefficients have been defined. These coefficients were based on the reduction of the higher mode effects and the reduction of the inter-story residual drifts. The results showed that generally, the double-rocking walls provides higher desirability coefficients than the other considered systems. Furthermore, the double-rocking walls by reducing the cable area in the bottom block (R2-H1) are more

کلیدواژه‌ها [English]

  • Self-Centering System
  • Rocking Wall
  • Residual Drift
  • Post-Tensioning
  • Higher Mode Effects

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