عمران و پروژه
اعتبار،چابکی،پاسخگویی

معرفی المان ElasticFoundation جهت مدل‌سازی اندرکنش خاک - سازه در نرم‌افزار OpenSees

https://doi.org/10.22034/cpj.2024.480635.1324
دوره 6، شماره 11 - شماره پیاپی 69
بهمن 1403
صفحه 61-77
عمران و پروژه

نوع مقاله : مقاله پژوهشی

نویسندگان

مروارید حاجیان 1
رضا عطارنژاد 2

1 دانشجوی مقطع دکتری مهندسی سازه، دانشگاه تهران، تهران، ایران

2 استاد دانشکده عمران، دانشگاه تهران، تهران، ایران

چکیده
‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬ اندرکنش خاک-سازه می‌تواند مشخصات دینامیکی سازه‌ها را تغییر دهد. ازین‌رو ضروریست تا در روش‌های طراحی، اثرات انعطاف‌پذیری بستر نیز درنظر گرفته شود. از آن‌جایی که مدل‌سازی خاک به صورت محیط پیوسته، از نظر محاسباتی پیچیده و زمان‌بر است، در این مطالعه المان دوبعدی جدیدی تحت عنوان ElasticFoundation در نرم‌افزار OpenSees پیشنهاد شده است که همانند المان تیر عمل کرده ولی می‌تواند اثرات اندرکنش اینرسی خا ک – سازه را به سادگی درنظر بگیرد. این المان برپایه‌ی روش المان تیر بر روی بستر دوپارامتری با ماتریس سختی پیشنهادی، توسعه یاقت. برای رسیدن به این هدف، از استخراج نتایج حاصل از تحلیل عددی و غیرخطی 25 سازه‌ شامل ساختمان‌های 1، 3، 5، 10 و 15 طبقه استفاده شد. به کمک این نتایج، ماتریس‌ سختی جدیدی برای تعریف المان دوبعدی ElasticFoundation معرفی شده است.

سپس، به کمک داده‌های تجربی موجود در ادبیات فنی، دقت و صحت اعتبار این المان پیشنهادی بررسی گردید. نتایج این تحقیق نشان دادند که بیشینه‌ی جابه‌جایی جانبی در سازه‌ی تجربی و مدل پیشنهادی بسیار نزدیک بهم و حدوداً برابر با 24 میلی‌متر بودند. همچنین متوسط جابه‌جایی نسبی طبقات نیز در مدل پیشنهادی و نمونه‌ی آزمایشی به ترتیب برابر با 01/0 و 02/0 بود. بدین ترتیب، المان خاک - فونداسیون پیشنهادی به درستی توانست رفتار خاک - فونداسیون را در مقایسه با مدل‌سازی پیوسته کامل خاک، تخمین بزند. این المان اثرات ابعاد پی، ضریب ایمنی قائم پی، مشخصات خاک، تعداد طبقات سازه و دوره‌ی تناوب سازه را در نظر می‌گیرد.

کلیدواژه‌ها

المان خاک و پی
اندرکنش خاک و سازه (SSI)
روش اجزای محدود (FEM)
بستر وینکلر
المان تیر دو پارامتری
نرم‌افزار OpenSees
موضوعات

عنوان مقاله English

Introducing the ElasticFoundation element for modeling soil-structure interaction in OpenSees software

نویسندگان English

Morvarid Hajian 1
Reza Attarnejad 2
1 PhD. candidate, School of civil Engineering, University of Tehran, Tehran, Iran
2 Professor, School of civil Engineering, University of Tehran, Tehran, Iran
چکیده English

The soil- structures interaction can alter the dynamic properties of the structures. Hence, it is essential to take into account the impacts of substrate flexibility when designing methods. As soil modeling in a continuous medium is computationally complex and time-consuming, a new two-dimensional element called ElasticFoundation was introduced in OpenSees. This element functions as a beam element and helps mitigate the impact of soil-structure inertial interaction. This component was created using the beam element on a two-parameter elastic foundation with a new suggested stiffness matrix. In order to reach this objective, the outcomes from both numerical and non-linear analysis of 25 structures were utilized, spanning buildings with 1, 3, 5, 10, and 15 stories. Using these findings, a fresh stiffness matrix was implemented to characterize the two-dimensional ElasticFoundation element.

Next, the accuracy and validity of this suggested element were verified using experimental data found in the technical literature. The findings of this study revealed that the experimental structure and the proposed model had nearly identical maximum lateral displacement of 24 mm. Moreover, the mean story drifts in the suggested model and the actual sample were 0.01 and 0.02, respectively. Therefore, the suggested soil-foundation element could accurately predict the soil-foundation behavior in comparison to complete soil continuum modeling. This element considered the impact of foundation size, foundation's vertical safety factor, soil properties, building's number of stories, and structure's frequency.

کلیدواژه‌ها English

  • Soil-structure interaction
  • Finite Element Method
  • Winkler model
  • beam on two-parameter elastic foundation
  • OpenSees Software
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  • تاریخ دریافت 06 مهر 1403
  • تاریخ بازنگری 10 آبان 1403
  • تاریخ پذیرش 11 آبان 1403
  • تاریخ اولین انتشار 11 آبان 1403
  • تاریخ انتشار 01 بهمن 1403

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