ارزیابی نیازهای لرزه‌ای قاب بتن آرمه مسلح به دیوار برشی فولادی تحت زلزله‌های متوالی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران.

2 دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

چکیده

زلزله‌های متوالی در مقایسه با زلزله‌های منفرد اثرات نامطلوبی برروی سازه‌ها از جمله تجمع آسیب‌های سازه‌ای و غیرسازه‌ای داشته و به دلیل عدم فرصت کافی جهت بازسازی سازه، احتمال تخریب سازه افزایش پیدا می‌کند. در این تحقیق تاثیر پدیده توالی لرزه‌ای بر سیستم نسبتا جدید قاب‌های خمشی بتن آرمه مسلح به دیوار برشی فولادی بررسی شده است. بر این اساس چهار قاب 4، 8 ،12 و24 طبقه که نماینده‌ای از سازه‌های کوتاه، متوسط، بلند می‌باشند، در نرم‌افزار المان محدود مدل‌سازی و در برابر چهار مجموعه شتاب‌نگاشت منفرد و متوالی قرار گرفته و با انواع روش‌های اعمال زلزله‌های متوالی شامل روش‌های واقعی (As Recorded)، تکراری (Back to Back) و تصادفی (Randomized) و تحت چهار مجموعه شتاب‌نگاشت منفرد و متوالی تحت تحلیل دینامیکی غیرخطی قرار گرفته‌اند. سناریوهای لرزه‌ای مورد استفاده شامل زلزله‌های متوالی بحرانی ثبت شده می‌باشد. تحلیل نشان داد که پریود غالب پس‌لرزه تاثیر مهمی در پاسخ سازه پس از زلزله اصلی دارد. توالی لرزه‌ای واقعی، بیشینه نیاز دریفت طبقات را به طور متوسط 2 برابر و نیاز شکل‌پذیری را به طور متوسط 52/1 برابر نیاز نظیر آن در زلزله منفرد افزایش داده است. در توالی لرزه‌ای مصنوعی به روش تکرار، بیشینه نیاز دریفت طبقات در مقیاس‌های پس‌لرزه 1، 5/1 و 2 نسبت به زلزله اصلی به طور متوسط 2/1، 0/2 و 6/2 برابر تقاضای نظیر در زلزله منفرد می‌باشد. پس‌لرزه‌ها ممکن است جهت و مقادیر تغییر مکان‌های پسماند را در توالی‌های لرزه‌ای واقعی و مصنوعی تغییر دهند. در ادامه تحقیق معادله محاسبه تقاضای شکل‌پذیری توالی لرزه‌ای استخراج شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Assessment of the Seismic Demands of Reinforced Concrete Frames Equipped with Steel Plate Shear Wall Under Sequence Earthquakes

نویسندگان [English]

  • Hamze Rouhi 1
  • Majid Gholhaki 2
1 Department of Civil Engineering, Semnan University, Semnan, Iran
2 Department of Civil Engineering, Semnan University, Semnan, Iran
چکیده [English]

Sequential earthquakes have severe destruction on structures, including the accumulative structural and nonstructural damage, compared to single earthquakes and due to the lack of sufficient opportunity to repair of the structure, the possibility of structural damage increases. In this research, the effect of seismic sequence on the relatively new system of reinforced concrete frames equipped with steel plate shear walls has been investigated. Based on this, four systems of 4, 8, 12 and 24 stories, which represent short, intermediate, tall, are modeled in finite element software and subject to four sets of the single and sequential earthquakes and with a variety of application methods. Sequential earthquakes, including real, repetitive and randomized methods, are subjected to non-linear dynamic analysis under four sets of single and sequential acceleration. The seismic scenarios used include sequential recorded critical earthquakes. The analysis showed that the predominant period of the aftershock significantly influences the post main shock response. Real seismic sequence increases the ratio of peak inter-story drift by an average of 2 times the similar demand in a single earthquake and increases the ratio of maximum ductility demand by 1.52 times in the structure. In artificial sequence, the ratio of peak maximum inter-story drift demand increase is in 100%, 150% and 200% aftershocks. In the iteration method, it is equal to 1.2, 2.0 and 2.6 times the single earthquake. Aftershocks may change the direction and magnitude of residual displacement in real and artificial seismic sequences. Continuation of the equation to calculate the demand for seismic sequence ductility was extracted.

کلیدواژه‌ها [English]

  • Reinforced concrete frame
  • Steel plate shear wall
  • Seismic sequence
  • Drift
  • Residual
  • Non-linear dynamics

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 2
اردیبهشت 1401
صفحه 565-604

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