مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی جامع اثر خواص مواد و هندسه بر پاسخ ارتعاشی فرابتن

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، دانشکده مهندسی عمران، آب و محیط زیست، دانشگاه شهید بهشتی، تهران، ایران
2 دانشیار، دانشکده مهندسی عمران، آب و محیط زیست، دانشگاه شهید بهشتی، تهران، ایران
3 استادیار، دانشکده مهندسی عمران، آب و محیط زیست، دانشگاه شهید بهشتی، تهران، ایران
چکیده
فرابتن با عملکرد دینامیکی ارتقاء یافته بر پایه خواص ویژه فرامواد، در جهت کاهش ارتعاشات به کمک بتن مهندسی‌شده توسعه یافته است. در پژوهش حاضر، میزان تأثیرگذاری پارامترهای طراحی سلول واحد فرابتن با در نظر گرفتن اندرکنش میان این پارامترها بر روی نوار ممنوعه با استفاده از روش تحلیل حساسیت جامع موریس ارزیابی شد. برای این منظور، براساس مفهوم جرم مؤثر منفی، از مدل‌سازی عددی به منظور دستیابی به نمودار پراکندگی استفاده شد. پارامترهای مورد بررسی در این پژوهش شامل چینش هندسی، نسبت حجمی مواد، خواص الاستیک و چگالی مادۀ ماتریس، پوشش و هستۀ سلول واحد فرابتن بودند. در این راستا تحلیل حساسیت مش‌ با معیار همگرایی فرکانس‌های نوار ممنوعه انجام گرفته است. علاوه بر این با استفاده از مفهوم ناحیه کاهش ناپذیر اول بریلوئن، اثر اشکال زاویه‌دار و هموار کاربردی در هسته و پوشش با نسبت حجمی یکسان مواد، بر فرکانس‌های بالا و پایین نوار ممنوعه بررسی شد. تحلیل جامع انجام شده برای ارزیابی حساسیت پارامترهای مواد و هندسۀ سلول واحد فرابتن، نشان می‌دهد که پارامترهای هندسی شعاع پوشش و طول سلول واحد جزء تأثیرگذارترین پارامترهای فرابتن بودند. همچنین از میان خواص الاستیک و چگالی سلول واحد، مدول الاستیسیته پوشش به عنوان پارامتر مهم شناسایی شد. یافته‌های حاصله، مبنایی را جهت طراحی بهینه فرابتن به منظور کنترل ارتعاشات در سازه‌ها فراهم می‌آورد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Comprehensive analysis to investigate the effect of geometry and material properties on dynamic response of Metaconcrete

نویسندگان English

Ali Akbar Ozmaei 1
mohammad safi 2
Hamid Bayesteh 3
1 Master Student, Dept.of civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran
2 Associate Professor, Dept.of civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran
3 Assistant Professor, Dept.of civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran
چکیده English

Metaconcrete with enhanced dynamic performance, based on the special properties of metamaterials, has been developed for vibration reduction using engineered concrete. In the present study, the influence of metaconcrete unit cell design parameters, considering the interaction between these parameters, on the band gap was evaluated using the global Morris sensitivity analysis method. To this end, based on the concept of negative effective mass, numerical modelling was used to obtain the dispersion curve. The parameters investigated in this study included the geometric arrangement, the volume ratio of materials, and the elastic properties and density of the metaconcrete unit cell's matrix material, coating, and core. In this regard, a mesh sensitivity analysis was conducted using the convergence criterion of the band gap frequencies. Furthermore, using the concept of the first irreducible Brillouin zone, the effect of applied angular and smooth shapes in the core and coating, with the same material volume ratio, on the upper and lower frequencies of the band gap was investigated. The comprehensive analysis conducted to evaluate the sensitivity of the material and geometric parameters of the metaconcrete unit cell indicates that the geometric parameters of coating radius and unit cell length were among the most influential metaconcrete parameters. Also, among the elastic properties and density of the unit cell, the elastic modulus of the coating was identified as an important parameter. The obtained findings provide a basis for the optimal design of metaconcrete for vibration control in structures.

کلیدواژه‌ها English

Metaconcrete
Band Gap
Metamaterial
Vibration Isolation
Unit Cell
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  • تاریخ دریافت 23 اردیبهشت 1404
  • تاریخ بازنگری 18 مرداد 1404
  • تاریخ پذیرش 18 شهریور 1404