ارزیابی عملکرد لرزه‌ای و تعیین سطوح عملکردی سیستم دوگانه قاب- دیوار برشی فولادی

نویسندگان
1 تهرام- تربیت مدرس
2 دانشجوی دوره دکتری، پژوهشگاه مدیریت بحران شاخص پژوه، اصفهان، ایران
3 استاد دانشگاه تربیت مدرس
چکیده
سیستم دوگانه قاب خمشی- دیوار برشی فولادی به دلیل عملکرد مناسب در ساختمان های متداول و بلند مرتبه در کشورهای زلزله خیز مورد استفاده قرار می‌گیرد. نو بودن این سیستم سازه‌ای از منظر عملکرد لرزه‌ای و بررسی سطوح عملکردی آن از یک طرف و عدم قطعیت در ویژگی‌های زلزله از طرف دیگر پراکندگی فراوانی در نتایج حاصل از پژوهشهای گذشته به وجود آورده است. در این تحقیق عملکرد لرزه‌ای سیستم دوگانه قاب خمشی- دیوار برشی فولادی به وسیله تحلیل دینامیکی غیر‌خطی فزاینده مورد بررسی عملکردی قرار گرفته و سطوح عملکردی برای این سیستم ارزیابی و تعیین شده است. برای این منظور قابی از یک ساختمان 4 طبقه با ارتفاع طبقه 5/3 متر در نظر گرفته شده است. این ساختمان مطابق استاندارد 2800 بارگذاری لرزه‌ای و بر اساس آیین‌نامه AISC360-10 و AISC Design Guide 20 طراحی لرزه‌ای شده است. جهت تحلیل دینامیکی فزاینده از 20 رکورد لرزه‌ای دور از گسل استفاده شده است. با انجام تحلیل‌های غیر‌خطی فزاینده بر روی قاب مورد نظر منحنی‌های تحلیل دینامیکی فزاینده با معیار پاسخ ماکزیمم نسبت تغییرمکان نسبی طبقات و دو معیار شدت لرزه‌ای ترسیم شده است. به منظور کاهش وابستگی نتایج به تغییرات رکورد لرزه‌ای، نتایج بر اساس دو ویژگی محتوای فرکانسی و زمان تداوم شتابنگاشت‌ها مورد مقایسه قرار گرفته است. در ادامه دو سطح عملکرد لرزه‌ای IO و CP برای سیستم دوگانه قاب خمشی- دیوار برشی فولادی مورد تعیین و ارزیابی قرار گرفته که سطح IO و CP به ترتیب متناظر دریفت 1.4 و 9 درصد می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

Evaluation of seismic performance and determine performance levels for dual steel moment- shear wall system

نویسندگان English

h sh 1
reza Bemanian 2
farhad DANESHJO 3
1 1
2 P.h.D Student, Shakhes pajouh, Esfahan, Iran
چکیده English

Dual system of. moment frame and steel sheer wall is interesting to researchers for the good performance in absorbing lateral forces such as earthquakes and for this reason used in normal and high-rise buildings in earthquake-prone countries is used. This system, has many advantages in comparison with the conventional lateral load systems. Some advantages of steel plate shear walls rather than the other systems could be mentioned as: High ductility, strength and stiffness. Being new to this system in terms of seismic performance and functional levels and uncertainty in the seismic characteristics of the other side has created dispersion in the results of previous research.

Evaluation and comparison of seismic performance of dual steel plate shear wall system is subject to far-fault ground motions is the aim of this study. To gain the aim, a four story frame with 14m in height is selected in 4-storey building with a height of 3.5 meters per floor. This building loading according to 2800 standard ad seismic design by AISC360-10 cod and AISC Design Guide 20. To verify the finite element model was used to model the driver and co-workers.

The entire infill plate and boundary elements were using shell elements. The fundamental period of the structure T was estimated 0.39 s. Twenty real earthquake records have been used far-fault acceleration with a magnitude 6 to 7.5 on the soil type II for Incremental dynamic analysis with nonlinear behavior in geometry and material specimen. The real earthquake records which represented a scenario of the probable earthquakes have been gradually increased in their intensity and applied to the frame steel plate shear walls to specify the Seismic behavior. An engineering demand parameters which appropriately characterizes the seismic response of the dual steel shear wall system and its related damage is selected. The IDA curves have been drawn for two Intensity measure the 5%-damped first-mode spectral acceleration Sa (T1; 5%) and Peak ground acceleration PGA and max inter-story drift ratio as an engineering demand parameter. each records were applied to the models incrementally by equal steps of 0.1 for IM and max inter-story drift ratio was obtained from the numerical results.The dispersion of the results by the standard deviation obtained for both intensity measured. Two seismic performance level immediate occupancy (IO) and Collapse Prevention (CP) were evaluated by conceptual definitions, Research and von Mises stress. The following dependence results were evaluated on the characteristics of records based on the frequency content of Acceleration and duration of acceleration.The finite element analyses show that the Damage Index in the elastic stage until the Instability a considerable dispersion of the results for different records. Frame at IO performance level show elastic behavior and a quick return to the original state structures and stiff behavior see and there were no fixed displacement but at CP performance level after a few seconds the system into the fixed displacement behavior. In dual steel plate shear wall system the first floor wall plate the most energy absorption through surrender among the other floor.

کلیدواژه‌ها English

Seismic Performance
Incremental dynamic analysis
Dual System
Steel shear wall
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