مهندسی سازه و ساخت

مهندسی سازه و ساخت

اصلاح رابطه جابه‌جایی معادل آب ناشی از زلزله افقی در مخازن بیضوی زمینی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 سایر، دانشکده فنی و مهندسی، دانشگاه قم، قم، ایران
2 استادیار، دانشکده فنی و مهندسی، دانشگاه قم، قم، ایران
چکیده
در این تحقیق به موضوع اصلاح رابطه جابه‌جایی معادل آب ناشی از زلزله افقی در مخازن بیضوی زمینی پرداخته شده است. اساسا مخزن سازه‌ای است که برای ذخیره انواع مایع به کار می‌رود و در انواع زمینی و هوایی و نیز بتنی و فولادی، کاربرد گسترده‌ای در تصفیه‌خانه‌ها، پالایشگاه‌ها و کارخانه‌ها دارد. با توجه به اعمال نیروهای دینامیکی و هیدرودینامیکی عظیم به یک مخزن بزرگ در هنگام زلزله و اهمیت زیاد تداوم عملکرد کامل سازه مذکور در شرایط بحرانی، مطالعه رفتار لرزه‌ای آن از اهمیت بالایی برخوردار است. در بارگذاری لرزه‌ای مخازن با استفاده از روابط نظریه هازنر، پارامتر جابه‌جایی معادل آب پارامتری کلیدی در محاسبه پارامترهای مود ارتعاش مواج از قبیل فشار مواج و ارتفاع موج می‌باشد. آیین‌نامه نیروگاه‌های اتمی آمریکا رابطه ساده‌ای را برای محاسبه جابه‌جایی معادل آب ارائه نموده است. در این تحقیق برای حصول دقت محاسباتی بیشتر در مخازن بیضوی زمینی، بر اساس نتایج مدل‌سازی و تحلیل دینامیکی مخازن مذکور به روش اجزای محدود در نرم‌افزار آنسیس، با استفاده از اصول برازش آماری، رابطه مناسبی برای جابه‌جایی معادل آب به دست آمده است. به دلیل داشتن شاخص دقت بیشتر، استفاده از رابطه پیشنهادی این تحقیق به جای رابطه ارائه شده توسط آیین‌نامه نیروگاه‌های اتمی آمریکا، دقت بالاتری را در کاربردهای طراحی مخازن فراهم می‌نماید. با مطالعه نتایج این تحقیق نتیجه گردید که شاخص دقت رابطه جابه‌جایی معادل آب پیشنهادی این تحقیق، به میزان 8/44 درصد از شاخص دقت رابطه متناظر آیین‌نامه نیروگاه‌های اتمی آمریکا بالاتر می‌باشد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Modification of Water Equivalent Displacement Relation under the Horizontal Seismic Load in the Ground Elliptical Tanks

نویسندگان English

Reza Lotfi 1
Masooud Mahmoudabadi 2
Ehsan Dehghani 2
1 Other, Faculty of Engineering, University of Qom, Qom, Iran
2 Assistant Professor, Faculty of Engineering, , University of Qom, Qom, Iran
چکیده English

The water equivalent displacement under horizontal seismic load in the ground elliptical tanks has been investigated in the current study. Basically, tank is a structure used to store different types of fluid, and it is also widely used in refineries, sewage treatment plants, and factories in the form of ground and elevated tanks made from concrete and steel. Regarding the application of huge dynamic and hydrodynamic loads on a tank at the time of earthquake and the great importance of the structure’s complete function continuity in the critical situations, it is highly important to study its seismic behavior. In Housner theory, water equivalent displacement is a key parameter in calculation of convective vibration mode parameters such as convective pressure and wave height. US nuclear reactors and earthquakes code has presented a simple relation to calculate water equivalent displacement. To obtain more calculation accuracy in the ground elliptical tanks, a suitable equation has been provided in the current study for the water equivalent displacement, based on modelling and dynamic analysis results of the tanks using finite elements method in ANSYS software, by the use of principles of statistical regression. Because of higher determination index, the use of the equation proposed by this study instead of the equation presented by US nuclear reactors and earthquakes code, provides more accuracy in the tank design applications. By the study of the conclusions of this research, it was revealed that the determination index of water equivalent displacement relation developed by this research is 44.8% higher than that of the corresponding relation of US nuclear reactors and earthquakes code.

کلیدواژه‌ها English

Elliptical tanks
Hydrodynamic relations
Housner theory
Finite elements
Statistical regression
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  • تاریخ دریافت 31 خرداد 1403
  • تاریخ بازنگری 02 مهر 1403
  • تاریخ پذیرش 08 مهر 1403