ارزیابی انرژی موجک برای ارتعاش شمع منفرد مدفون در ماسه تحت اثر زلزله¬های حوزه دور و نزدیک
محورهای موضوعی : آنالیز سازه - زلزله
نوید حسن پوری نوتاش
1
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روزبه دبیری
2
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مسعود حاجیعلیلو بناب
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لاریسا خدادادی
4
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فریبا بهروز سرند
5
1 - دانشجوی دکتری، گروه مهندسی عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
2 - دانشیار، گروه مهندسی عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
3 - استاد، گروه مهندسی ژئوتکنیک، دانشکده عمران، دانشگاه تبریز، تبریز، ایران
4 - استادیار، گروه مهندسی برق، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
5 - استادیار، گروه مهندسی عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
کلید واژه: شمع, زلزله¬های حوزه دور و نزدیک, تبدیل موجک, Abaqus, MATLAB,
چکیده مقاله :
ارزیابی عملکرد شمع در برابر بارگذاری های لرزه‌ای یکی از مسائل مهم در مهندسی ژئوتکنیک به شمار می‌رود. رویکردهای مختلفی در ارزیابی این عملکرد مورد استفاده قرار می‌گیرند که می‌توان به رویکردهای پیوسته و گسسته اشاره نمود. در رویکرد پیوسته می‌توان از تحلیل‌های دوبعدی و سه بعدی استفاده نمود. یکی از معایب بسیار مهمی که در تحلیل‌های سه بعدی شمع می‌توان به آن اشاره نمود، افزایش هزینه‌های محاسباتی است. بنابراین، بهبود دقت تحلیل‌های دوبعدی به منظور کاهش هزینه‌های محاسباتی امری اجتناب‌ناپذیر است. در مطالعه حاضر، رفتار شمع منفرد مدفون در خاک ماسه تک¬لایه و دولایه تحت دو رکورد زلزله (حوزه دور و نزدیک) با استفاده از نرم¬افزار المان محدود Abaqus مورد ارزیابی قرار گرفت. در گام بعد، پردازش سیگنال داده¬های شتاب- زمان مقطع شمع با استفاده از تبدیل موجک انجام گرفت. براساس نتایج، انرژی موجک برای سیگنال سرشمع تحت رکورد حوزه نزدیک بیشتر از رکورد حوزه دور به¬دست آمد. به¬طوری¬که برای خاک تک¬لایه و دولایه به¬ترتیب در حدود 11% و 41% افزایش در انرژی موجک محاسبه شد. این افزایش در انرژی موجک ناشی از افزایش قابل ملاحظه جابه¬جایی افقی شمع تحت رکوردهای حوزه نزدیک گسل در مقایسه با رکوردهای حوزه دور است. بنابراین، با انجام تحلیل سیگنال مبتنی بر تبدیل موجک پیوسته بر روی شتاب افقی مقطع شمع می¬توان اطلاعات مناسبی از نوع رکورد زلزله به¬لحاظ نزدیکی و دوری از گسل تعیین نمود.
Evaluating pile performance against seismic loading is one of the most important issues in geotechnical engineering. Various approaches are used in the evaluation of this performance, which can be referred to as continuous and discrete approaches. In the continuous approach, two-dimensional and three-dimensional analyzes can be used. One of the very important disadvantages that can be pointed out in the three-dimensional analyzes of piles is the increase in computational costs. Therefore, improving the accuracy of two-dimensional analyzes in order to reduce computational costs is inevitable. The present study has used Abaqus finite element software to evaluate the response of a single pile embedded in single— and double-layer sand under two earthquake records (far-field and near-field). The subsequent stage involved employing the wavelet transformation technique to analyze the signal derived from the pile cross-section. The present study utilized the acceleration time histories of the pile head as the input signal for wavelet transformation. The result showed that the wavelet energy for the pile head signal was higher in the near-field record than in the far-field record. The analysis indicated an 11% and 41% increase in wavelet energy for single-layer and double-layer profiles, respectively. This increase in wavelet energy is due to the significant increase in horizontal displacement of the pile under near-field records compared to far-field records. Therefore, by implementing signal processing analysis employing continuous wavelet transformation on the horizontal acceleration of the pile section, relevant information regarding the type of earthquake records that occurred at the site can be extracted.
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