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

مهندسی عمران فردوسی

مقاله 3، دوره 36، شماره 4 - شماره پیاپی 44، دی 1402، صفحه 35-54   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jfcei.2023.80361.1206

نویسندگان

لیلا کلانی ساروکلایی¹؛ لیلا خان محمدی²؛ بهرام نوائی نیا^{* 3}

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

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

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

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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