پیوندهای مفید
آمار
| تعداد نشریات | 8 |
| تعداد شمارهها | 438 |
| تعداد مقالات | 5,650 |
| تعداد مشاهده مقاله | 7,684,111 |
| تعداد دریافت فایل اصل مقاله | 6,340,188 |
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 | ||
|
[1] S.L. Kramer, Geotechnical earthquake engineering, Pearson Education India, 1996. [2] X. Wang, Y. Liu, F. Nicot, Energy processes and phase transition in granular assemblies, International Journal of Solids and Structures, 289 (2024) 112634. [3] N. Okada, S. Nemat-Nasser, Energy dissipation in inelastic flow of saturated cohesionless granular media, Geotechnique, 44(1) (1994) 1-19. [4] S. Thevanayagam, T. Kanagalingam, T. Shenthan, Intergrain friction, contact density, and cyclic resistance of sands, in: Proc. of 2003 Pacific Conference on Earthquake Engineering, Christchurch, New Zealand, 2003. [5] B. Asmar, P. Langston, A. Matchett, J.K. Walters, Energy monitoring in distinct element models of particle systems, Advanced Powder Technology, 14(1) (2003) 43-69. [6] B. Asmar, P. Langston, J. Walters, A. Matchett, T. Yanagida, Distinct element model of energy dissipation in vibrated binary particulate mixtures, Particulate science and technology, 24(4) (2006) 395-409. [7] T. Yanagida, A. Matchett, J. Coulthard, Energy dissipation of binary powder mixtures subject to vibration, Advanced Powder Technology, 12(2) (2001) 227-254. [8] S. Lenart, The use of dissipated energy at modeling of cyclic loaded saturated soils, Earthquake Engineering: New Research. Nova Science Publishers, Inc., New York, (2008). [9] U. El Shamy, C. Denissen, Microscale characterization of energy dissipation mechanisms in liquefiable granular soils, Computers and Geotechnics, 37(7-8) (2010) 846-857. [10] U. El Shamy, C. Denissen, Microscale energy dissipation mechanisms in cyclically-loaded granular soils, Geotechnical and Geological Engineering, 30 (2012) 343-361. [11] P. Xia, L. Shao, W. Deng, Mechanism study of the evolution of quasi-elasticity of granular soil during cyclic loading, Granular Matter, 23 (2021) 1-15. [12] H. Xiao, Z. Zhang, Y. Chi, M. Wang, H. Wang, Experimental study and discrete element analysis on dynamic mechanical behaviour of railway ballast bed in windblown sand areas, Construction and Building Materials, 304 (2021) 124669. [13] K.J. Hanley, X. Huang, C. O'Sullivan, Energy dissipation in soil samples during drained triaxial shearing, Géotechnique, 68(5) (2018) 421-433. [14] J. Keishing, X. Huang, K.J. Hanley, Energy dissipation in soil samples during cyclic triaxial simulations, Computers and Geotechnics, 121 (2020) 103481. [15] L. Tong, Y. Gao, Y.-H. Wang, DEM simulations of energy dissipation in sand under static and cyclic loading, Journal of Testing and Evaluation, 49(1) (2021) 28-44. [16] F. Terzioglu, J.A. Rongong, C.E. Lord, Influence of particle sphericity on granular dampers operating in the bouncing bed motional phase, Journal of Sound and Vibration, 554 (2023) 117690. [17] M. Sánchez, C.M. Carlevaro, L.A. Pugnaloni, Effect of particle shape and fragmentation on the response of particle dampers, Journal of Vibration and Control, 20(12) (2014) 1846-1854. [18] H. Pourtavakoli, E.J. Parteli, T. Pöschel, Granular dampers: does particle shape matter?, New Journal of Physics, 18(7) (2016) 073049. [19] W. Xiong, Q.-m. Zhang, J.-f. Wang, Effect of morphological gene mutation and decay on energy dissipation behaviour of granular soils, Journal of Zhejiang University-SCIENCE A, 24(4) (2023) 303-318. [20] P. Jacobs-Capdeville, S. Kuang, J. Gan, A. Yu, Micromechanical analysis of granular dynamics and energy dissipation during hopper discharging of polydisperse particles, Powder Technology, 422 (2023) 118462. [21] S. Abedi, A.A. Mirghasemi, Particle shape consideration in numerical simulation of assemblies of irregularly shaped particles, Particuology, 9(4) (2011) 387-397. [22] L. Rothenburg, R. Bathurst, Micromechanical features of granular assemblies with planar elliptical particles, Geotechnique, 42(1) (1992) 79-95. [23] J.M. Ting, M. Khwaja, L.R. Meachum, J.D. Rowell, An ellipse‐based discrete element model for granular materials, International Journal for numerical and analytical methods in geomechanics, 17(9) (1993) 603-623. [24] A. Mirghasemi, L. Rothenburg, E. Matyas, Numerical simulations of assemblies of two-dimensional polygon-shaped particles and effects of confining pressure on shear strength, Soils and Foundations, 37(3) (1997) 43-52. [25] T. Matsushima, H. Saomoto, Discrete element modeling for irregularly Y-shaped sand grains, in: NUMGE 2002. 5th European Conference Numerical Methods in Geotechnical Engineering, 2002, pp. 239-246. [26] M.M. Shamsi, A. Mirghasemi, Numerical simulation of 3D semi-real-shaped granular particle assembly, Powder technology, 221 (2012) 431-446. [27] G. Yang, X. Yan, S. Nimbalkar, J. Xu, Effect of particle shape and confining pressure on breakage and deformation of artificial rockfill, International Journal of Geosynthetics and Ground Engineering, 5 (2019) 1-10. [28] T. Zhang, C. Zhang, J. Zou, B. Wang, F. Song, W. Yang, DEM exploration of the effect of particle shape on particle breakage in granular assemblies, Computers and Geotechnics, 122 (2020) 103542. [29] V. Gorbanpoor, M. EMAMI Tabrizi, DEM investigation of the effect of arrangement of grains on the behavior of brittle granular materials subjected to one dimensional compression, Amirkabir Journal of Civil Engineering, 54(11) (2023) 4139-4162. [30] Q. Wu, Z. Yang, X. Li, Numerical simulations of granular material behavior under rotation of principal stresses: micromechanical observation and energy consideration, Meccanica, 54 (2019) 723-740. [31] P. Jongchansitto, X. Balandraud, I. Preechawuttipong, J.-B. Le Cam, P. Garnier, Thermoelastic couplings and interparticle friction evidenced by infrared thermography in granular materials, Experimental Mechanics, 58 (2018) 1469-1478. [32] P. Jongchansitto, X. Balandraud, I. Preechawuttipong, J.-B. Le Cam, P. Garnier, Analysis of the thermomechanical response of granular materials by infrared thermography, in: Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems, Volume 7: Proceedings of the 2018 Annual Conference on Experimental and Applied Mechanics, Springer, 2019, pp. 7-11. [33] T. Zhao, Coupled DEM-CFD analyses of landslide-induced debris flows, Springer, 2017. [34] Itasca. PFC 5.0 (Particle flow code in 2 and 3 dimensions), Version 5.0, User’s manual, in, 2017. [35] K.H. Hunt, F.R.E. Crossley, Coefficient of restitution interpreted as damping in vibroimpact, (1975). [36] I. Agnolin, J.-N. Roux, Internal states of model isotropic granular packings. I. Assembling process, geometry, and contact networks, Physical Review E, 76(6) (2007) 061302. [37] M. Babić, H.H. Shen, H.T. Shen, The stress tensor in granular shear flows of uniform, deformable disks at high solids concentrations, Journal of Fluid Mechanics, 219 (1990) 81-118. [38] C.S. Campbell, Granular shear flows at the elastic limit, Journal of fluid mechanics, 465 (2002) 261-291. [39] C. Chaiamarit, X. Balandraud, I. Preechawuttipong, M. Grédiac, Stress network analysis of 2D non-cohesive polydisperse granular materials using infrared thermography, Experimental Mechanics, 55 (2015) 761-769. [40] B. Cambou, M. Jean, F. Radjaï, Micromechanics of granular materials, John Wiley & Sons, 2013. [41] C. O'Sullivan, Particulate discrete element modelling: a geomechanics perspective, CRC Press, 2011. | ||
|
آمار تعداد مشاهده مقاله: 571 تعداد دریافت فایل اصل مقاله: 554 |
||