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بررسی اثر هم زمانی بارهای لرزهای و انفجاری در قابهای بتن مسلح | ||
| نشریه مهندسی عمران و محیط زیست | ||
| مقاله 7، دوره 55، شماره 120، آذر 1404، صفحه 75-88 اصل مقاله (7.83 M) | ||
| نوع مقاله: مقاله کامل پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22034/ceej.2024.61249.2348 | ||
| نویسندگان | ||
| غلامرضا استادی اصل* ؛ سمیه ملایی؛ علی شاه محمدی | ||
| گروه مهندسی عمران، دانشگاه بناب، آذربایجان شرقی | ||
| چکیده | ||
| زلزله و انفجار ازجمله نیروهای دینامیکی مهم می باشند که میتوانند موجب ایجاد خرابی های شدید در سازه شوند. انفجار تأسیسات الکتریکی و مکانیکی موجود در ساختمان ها پس از وقوع زلزله و یا بالعکس، ایجاد زمینلرزههای القایی در پی انفجارهای مهیب زیرزمینی، اهمیت بررسی اثر هم زمانی بارهای لرزهای و انفجاری را نشان میدهد. با این وجود، توجه به تفاوت ماهیتی بارهای انفجار و زلزله و مشکلات مربوط به آزمایشهای عملی و یا حتی مدل سازی هم زمانی این دو حالت، موجب شده تحقیقات در این زمینه بسیار اندک باشد. در این پژوهش با استفاده از حلگر صریح نرم افزار اجزای محدود ABAQUS یک قاب بتن مسلح تحت سناریوهای مختلف هم زمانی بار زلزله و انفجار تحلیل گردید. این سناریوها شامل حالات مختلفی از انفجار قبل از و یا در حین زلزله، راستای اثر متعامد یا موازی زلزله و انفجار و انفجار در وجه روبه رو، جانبی و یا داخل قاب بود. مهمترین یافتهها نشان داد که در هر سه حالت انفجار روبه روی قاب، انفجار جانبی و انفجار داخلی در شرایط بارگذاری زلزله و انفجار متعامد نسبت به بارگذاری همراستا، آسیب بیشتری به سازه وارد گردید. تحت سناریوهای انفجار در مقابل سازه، جابه جایی طبقات بیشتر به بار انفجار وابسته بوده و بار زلزله نقش تعیین کنندهای نداشته است. به طوری که حداکثر جابه جایی در قابل حدود 22 میلیمتر در هر دو حالت انفجار قبل از زلزله و انفجار و زلزله هم زمان یکسان بوده است. آسیبهای ناشی از وقوع انفجار در وجه روبه رویی قاب عمدتاً متوجه ستونها و پای ستون، آسیبهای ناشی از انفجار جانبی متوجه تیرها و در نهایت، آسیبهای ناشی از انفجار داخلی متوجه تیرها و ستونهایی بود که بر محل قرارگیری ماده منفجره محیط بودند. سناریوهایی که در آن ها انفجار در طی جنبش نیرومند زمینلرزه اتفاق میافتاد، نسبت به حالت انفجار قبل از زلزله، بحرانی تر بوده و آسیب بیشتری به سازه وارد میکرد. همچنین، در حالت انفجار داخلی، با وجود مقدار بسیار کمتر وزن خرج انفجاری (13 کیلوگرم) در قیاس با دو حالت انفجار روبه رویی و جانبی، آسیب های شدید و گسترده در دهانه میانی طبقه اول و همچنین سایر قسمتهای سازه مشاهده میشود. در نتیجه، بحرانیترین حالت بارگذاری مربوط به انفجار داخلی باشد. | ||
| کلیدواژهها | ||
| قاب بتن مسلح؛ زلزله؛ انفجار؛ هم زمانی زلزله و انفجار؛ ABAQUS | ||
| مراجع | ||
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