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بررسی اثر فاکتور شکل در مولفههای انرژی در محیط دانهای تحت بارگذاری چرخهای به روش المان مجزا | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 6، دوره 56، شماره 9، 1403، صفحه 1193-1216 اصل مقاله (2 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2024.22238.7937 | ||
| نویسندگان | ||
| هاله مشگین قلم؛ مهرداد امامی تبریزی* ؛ محمدرضا چناقلو | ||
| دانشکده مهندسی عمران و مرکز تحقیقات زلزله دانشگاه صنعتی سهند، تبریز، ایران | ||
| چکیده | ||
| میراگرهای دانهای به طور گسترده در کاربردهای مختلف از جمله زیر شالودهها برای جلوگیری از انتقال امواج زلزله به طبقات ساختمان استفاده میشوند. با توجه به اینکه شکل هندسی دانهها یکی از مهمترین خصوصیات اثرگذار در رفتار استهلاکی مجموعه مصالح دانهای میباشد، لذا در این تحقیق به بررسی تاثیر فاکتور شکل در مولفههای انرژی پرداخته شده است. بدین منظور، مدل عددی بر اساس روش المان مجزا و با نرم افزار PFC 2D مطابق یک مدل آزمایشگاهی و تحت اثر بارگذاری چرخهای شبیه سازی و اعتبار سنجی گردید. از المان کلامپ برای شبیه سازی دانهها در سه شکل دایره معرف مصالح گرد گوشه و مربع و مثلث معرف مصالح تیزگوشه، استفاده شد. در نهایت مدلهای ترکیبی متشکل از دانههایی با سه شکل مذکور برای شبیه سازی ایجاد شدند. نتایج حاکی از آنست که در شرایط محصور شده و در اثر تغییر شکل دانهها، بیش از 80% انرژی کل به صورت انرژی کرنشی الاستیک ذخیره یا در اثر لغزش بین دانهها تلف میشود و سهم انرژیهای جنبشی و میرایی در حدود 10 تا 15 درصد انرژی کل میباشد. همچنین اگر نسبت شعاع بزرگترین دایره محاطی به شعاع کوچکترین دایره محیطی در اطراف دانه تیز گوشه به 1 نزدیکتر شود (دانه مربعی شکل)، میزان انرژی استهلاکی میرایی بیشتر و اگر نسبت مذکور کمتر شود (دانه مثلثی شکل)، انرژی استهلاکی در اثر اصطکاک افزایش مییابد. به طور کلی در سیستمهای دانهای، استفاده از ترکیب دانههای تیز گوشه و گرد گوشه با نسبت مساوی جهت استهلاک انرژی دارای عملکرد مناسبی میباشد. | ||
| کلیدواژهها | ||
| مولفههای انرژی؛ شکل دانه؛ محیط دانهای؛ بارگذاری چرخهای؛ روش المان مجزا | ||
| موضوعات | ||
| روش های عددی؛ مکانیک خاک و پی | ||
| عنوان مقاله [English] | ||
| Investigating the effect of particle shape on energy components in granular media under cyclic loading | ||
| نویسندگان [English] | ||
| Haleh Meshginghalam؛ Mehrdad EMAMI Tabrizi؛ Mohammad Reza Chenaghlou | ||
| Ph.D. Candidate, Civil Engineering Faculty, Sahand University of Technology (SUT) | ||
| چکیده [English] | ||
| Granular dampers installed at the foundation can effectively reduce vibration in the upper stories during an earthquake. Given that particle shape is a crucial property influencing the mechanical behavior of granular materials, this study investigates the effect of particle shape on energy components and the macroscopic response of granular media. The numerical model was analyzed using the discrete element method (PFC 2D), based on an existing laboratory model and subjected to cyclic loading. Following verification, clump elements were employed to simulate particles in three shapes: a circle to represent rounded particles and a square and triangle for angular particles. Combined models featuring these three shapes were also utilized in the simulations. The results indicate that under confined conditions, over 80% of the total energy is stored as elastic strain energy or dissipated due to sliding between particles. The contribution of kinetic and damping energy accounts for approximately 10 to 15% of the total energy. Angular square-shaped particles enhance dissipated energy through damping, while triangular-shaped particles increase energy dissipation due to sliding. For optimal energy dissipation in granular media, a mixed-use of rounded and angular particles in equal proportions is recommended. | ||
| کلیدواژهها [English] | ||
| Energy Components, Particle Shape, Granular Media, Cyclic Loading, Discrete Element Method | ||
| مراجع | ||
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