بررسی تأثیر فرکانس‌بارگذاری بر روی پارامترهای دینامیکی مخلوط ماسه- پودر‌لاستیک با استفاده از آزمایش‌های میز‌لرزه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار دانشکده فنی دانشگاه ارومیه

2 گروه عمران دانشکده فنی دانشگاه ارومیه ایران

چکیده

مروزه استفاده از مشتقات تایرهای لاستیکی فرسوده در پروژه‌های مختلف ژئوتکنیکی به منظور جذب و کاهش ارتعاش ناشی از بارهای لرزهای و دینامیکی گسترش یافته و از این نظر بررسی تاثیر پارامترهای مختلف بر روی رفتار و مشخصات دینامیکی آنها در ترکیب با خاک از اهمیت فراوانی برخوردار می‌باشد. لذا در این مقاله تاثیر فرکانس بارگذاری بر روی پارامترهای دینامیکی مخلوط ماسه-پودر لاستیک از قبیل مدول برشی (G )و ضریب میرایی (D )مورد بررسی قرار گرفته است. یک سری آزمایش میز لرزه 1g بر روی مخلوط ماسه- پودر لاستیک انجام گرفت. نمونه های خاک دردو حالت غیر مسلح و مسلح به پودر لاستیک با درصدهای وزنی 5 ،%10 ،%15 %و 20 %پودرلاستیک، و در تراکم نسبی صفر درصد تحت بارگذاری سینوسی در فرکانس های 0/5 ،1 ،2 ،3 ،5 ،7و 9 هرتز و تحت شتاب ورودی 0/1g و 0/3g قرار گرفتند. نتایج نشان داد که در همه حالات، افزایش در فرکانس بارگذاری در تعداد سیکل یکسان، باعث افزایش در مقادیر مدول برشی و نسبت میرایی می‌شود. ضمن اینکه با افزایش کرنش برشی مدول برشی مخلوط کاهش یافته ولی نسبت میرایی افزایش می‌یابد. از طرف دیگر با افزایش درصد پودر لاستیک، از مقدار مدول برشی کاسته شده ولی بر میزان ضریب میرایی افزوده می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigating the Effect of Loading Frequency on the Dynamic Properties of SandTire Powder Mixture Using Shaking Table Tests

نویسندگان [English]

  • hadi bahadori 1
  • amin khalili 2
1 Associate Professor, Department of Civil Engineering, Urmia University
2 phd student, department of civil engineering, urmia university
چکیده [English]

Nowadays, the use of waste tires has been expanded in various geotechnical projects to absorb and reduce the vibration caused by seismic and dynamic loads, and therefore it is crucial to study the effect of different parameters on their behavior and dynamic characteristics in combination with soil. So this study examined the effects of loading frequency on dynamic properties of sand-tire powder mixtures such as shear modulus (G) and damping ratio (D). A series of 1-g shaking table tests were performed on sand-tire powder mixture. Tire powders were added to the sand with 5%, 10%, 15% and 20% in gravimetric basis and with a relative density of zero were subjected to sinusoidal loading at frequencies of 0.5, 1, 2, 3, 5, 7 and 9 Hz and input acceleration of 0.1g and 0.3g. The results showed that in all cases, the increase in frequency in the same cycles increased the shear modulus and the damping ratio. Also, with increasing shear strain, the shear modulus of the mixture decreased, but the damping ratio increased. On the other hand, by increasing the tire powder, the value of the shear modulus is reduced, but the amount of damping ratio is increased.

کلیدواژه‌ها [English]

  • Sand
  • Tire Powder
  • shaking table
  • Shear Modulus
  • Damping Ratio
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