ارزیابی نیروهای طراحی لرزه‌ای مخازن هوایی ذخیره مایعات بر اساس طیف طرح استاندارد 2800 و نشریة شمارة 38 در پهنه با خطر نسبی خیلی زیاد زلزله

امیدی نسب, فریدون

doi:10.30478/jcsm.2023.404123.1333

ارزیابی نیروهای طراحی لرزه‌ای مخازن هوایی ذخیره مایعات بر اساس طیف طرح استاندارد 2800 و نشریة شمارة 38 در پهنه با خطر نسبی خیلی زیاد زلزله

نوع مقاله : مقاله پژوهشی

نویسنده

فریدون امیدی نسب

دانشیار سازه، دانشکده فنی و مهندسی، دانشگاه لرستان، خرم آباد، ایران

10.30478/jcsm.2023.404123.1333

چکیده

بطور کلی مخازن هوایی ذخیره مایعات به علت شکل‌پذیری و ظرفیت جذب انرژی کم برای سطح نیروهای لرزه‌ای بالاتری نسبت به ساختمان‌ها طراحی می‌شوند. به طوریکه برای یک مخزن با شکل‌پذیری کم، ضریب برش پایه آن در حدود 6 تا 7 برابر بزرگتر از ضریب برش پایه یک ساختمان شکل‌پذیر است و برای یک مخزن با شکل‌پذیری بالا، این نسبت در حدود 3 تا 4 برابر در تمام استانداردها می‌باشد. در استاندارد 2800، ویرایش چهارم برای مخازن هوایی ذخیره مایعات ضریب رفتار 2 و 3 لحاظ شده است. در نشریه 38 ضریب رفتار برای مخازن هوایی مطابق با استاندارد 2800 ارائه شده است. نتایج نشان داد که در استاندارد 2800، نسبت ضریب برش پایه مخزن به ضریب برش پایه ساختمان شکل‌پذیر در پهنه با خطر نسبی خیلی زیاد به ترتیب برای مخازن با ضریب رفتار 3 و 2 در پریودهای کوتاه، به ترتیب برابر با 3.5 و 5،25 بوده در حالیکه این مقدار در نشریة 38 به ترتیب 4 و 6 حاصل شده است. همچنین نتایج نشان دادکه مقدار نسبت ضریب برش پایه مخازن به ساختمان در پریودهای کوتاه، برای هر دو ضریب رفتار و چهار نوع خاک در نشریة 38 به مقدار 14 درصد بیشتر از نتایج ویرایش چهارم استاندارد 2800 است. مقدار نسبت ضریب برش پایه مخازن به ساختمان در پریودهای بلند، برای هر دو ضریب رفتار و چهار نوع خاک در نشریة 38 به مقدار حداکثر 36 درصد کمتر از نتایج ویرایش چهارم استاندارد 2800 است.

کلیدواژه‌ها

موضوعات

تحلیل و طراحی سازه های بتنی

عنوان مقاله [English]

Evaluation of Seismic Design Forces of Liquid Storage Elevated Tanks based on Standard Design 2800 and Publication No. 38 in the Area with very High Relative risk of Earthquake

نویسنده [English]

Fereydoon Omidinasab

Associate Professor, Department of Engineering, Lorestan University, Khorramabad, Iran

چکیده [English]

Generally, elevated tanks of liquid storage are designed for higher seismic forces than buildings due to their ductility and low energy absorption capacity. So that for a tank with low ductitlity, its base shear coefficient is about 6 to 7 times larger than the base shear coefficient of a ductile building and for a tank with high ductility, this ratio is about 3 to 4 times higher than all standards. In standard 2800, the fourth edition for elevated tanks of liquid storage behavior coefficient 2 and 3 is considered. In standard 2800, the fourth edition for air tanks of liquid storage behavior coefficient 2 and 3 is considered. In the publication, No. 38 coefficients of behavior for elevated tanks are presented in accordance with the standard 2800. The results showed that in standard 2800, the ratio of the base shear coefficient of the tank to the base shear coefficient of the ductile building in the relatively high risk zone for tanks with behavior coefficients of 3 and 2 in short periods was 3.5 and 5,25, respectively, while this value was obtained in No. 38 publications 4 and 6, respectively. The results also showed that the ratio of base shear coefficient of tanks to buildings in short periods for both behavior coefficients and four soil types in publication No. 38 was 14% higher than the results of the fourth edition of standard 2800

کلیدواژه‌ها [English]

Elevated Tanks
Design Spectrum
Standard 2800
Ductility
Seismic Design Force
Publication No. 38

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