تحلیل مخازن زمینی مکعبی بتنی با جداساز پایه تحت مولفه‌های انتقالی و دورانی زلزله

نوع مقاله : مقاله پژوهشی

نویسندگان

• لیلا کلانی ساروکلایی ¹
• لیلا خان محمدی ²
• بهرام نوائی نیا ³

¹ گروه مهندسی عمران، دانشکده فنی و مهندسی، موسسه آموزش عالی طبری، بابل.

² گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه پیام نور، تهران.

³ دانشکده مهندسی عمران، دانشگاه صنعتی نوشیروانی بابل، بابل.

10.22067/jfcei.2023.80361.1206

چکیده

در این پژوهش رفتار مخازن بتنی زمینی مکعبی مجهز به جداساز‌ پایه هسته سربی، تحت تحریک هم‌زمان مولفه‌های انتقالی و دورانی زلزله‌های حوزه دور از گسل با استفاده از تحلیل تاریخچه زمانی غیرخطی با احتساب اندرکنش آب و سازه مورد بررسی قرار گرفته است. بدین منظور ابتدا مولفه دورانی سه زلزله‌ حوزه دور با استفاده هم‌زمان از تئوری انتشار امواج و روابط تئوری الاستیسیته با کدنویسی در نرم‌افزار متلب تولید شد. سپس مخازن در دو حجم 500 و 1000 مترمکعب در سه حالت خالی، نیمه‌پر و پر در نرم‌افزار اجزای محدود انسیس مدل‌سازی و از تعداد مناسبی جداساز در تراز کف استفاده گردید. در مدل‌سازی اجزای محدود جداساز، مدلی متشکل از المان‌های یک‌بعدی پیشنهاد و استفاده شده که رفتار هیسترزیس آن معادل رفتار مدل سه‌بعدی جداساز لاستیکی هسته سربی می‌باشد. نتایج پژوهش نشان می‌دهد اثر کاهشی یا افزایشی مولفه دورانی زلزله بر پاسخ لرزه‌ای مخازن زمینی در حالت پر و نیمه‌پر کمتر از 10% بوده و در حالت کلی می‌توان از اثر آن بر پاسخ لرزه‌ای مخازن مکعبی زمینی صرف‌نظر نمود. همچنین به‌کارگیری جداساز در این نوع مخازن سبب افزایش پاسخ مخازن در کلیه حالت‌های مورد بررسی شده است. به طوری‌که نیروی برش پایه تا 4 برابر و تنش بلندشدگی بین 8 الی 23 برابر افزایش یافته که این اثر را می‌توان به افزایش دوره تناوب مخازن زمینی از محدوده ابتدایی طیف پاسخ به ناحیه شتاب ثابت طیف به دلیل حضور جداساز نسبت داد.

کلیدواژه‌ها

• مخزن مکعبی زمینی
• مولفه دورانی
• جداساز پایه
• اندرکنش آب و سازه
• تحلیل غیرخطی

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عنوان مقاله [English]

Dynamic analysis of concrete rectangular ground tanks equipped with base isolators due to transitional and rotational components of earthquakes

نویسندگان [English]

• leila kalani sarokolayi ¹
• Leila Khanmohammadi ²
• Bahram Navayi Neya ³

¹ Department of Structural Engineering, Faculty of Civil Engineering, Tabari University, Babol

² Department of Civil Engineering, Faculty of Engineering, Payame Noor University, Tehran, Iran.

³ Faculty of Civil Engineering, Noshirvani University of Technology, Babol.

چکیده [English]

In this research, the behavior of concrete rectangular ground tanks equipped with lead-rubber base isolators has been investigated under the simultaneous excitation of transitional and rotational components of earthquakes, using nonlinear time history analysis including water-structure interaction. For this purpose, first, the rotational component of three earthquakes was generated using the wave propagation and classic elasticity theories simultaneously. Then, the tanks equipped with appropriate number of base isolators were modeled in two volumes of 500 and 1000 m3 and three states of water level. In modeling the finite elements of the isolators, a model consisting of one-dimensional elements is proposed; whose hysteresis behavior is equivalent to the behavior of the three-dimensional model of the isolators.

The results of the research show that the decreasing or increasing effect of the rotational component of the earthquake on the seismic response of these tanks in the full and half-full state is less than 10%, and in general, its effect on the seismic response of the rectangular ground tanks can be ignored. Also, the presence of isolators in these types of tanks has increased the response of the tanks in all states. So that the base shear force has increased up to 4 times and the normal stress has increased between 8 and 23 times, which can be attributed to the increase in the period of ground tanks from the initial range of the response spectrum to the constant acceleration region of the spectrum due to the presence of the base isolators.

کلیدواژه‌ها [English]

• concrete rectangular ground tank
• rotational component
• base isolator
• water-structure interaction
• nonlinear dynamic analysis

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