کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
287098 509534 2016 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Critical velocity of a uniformly moving load on a beam supported by a finite depth foundation
ترجمه فارسی عنوان
سرعت بحرانی بار یکنواخت حرکت بر روی یک پرتو توسط یک پایه عمودی محدود است
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی


• Introduction of simplified models of a beam on a finite depth foundation traversed by a moving load.
• New formula for the critical velocity.
• New analytical solution for finite beams.
• Enhanced semi-analytical solution for infinite beams.

In this paper, a new formula for the critical velocity of a uniformly moving load is derived. It is assumed that the load is traversing a beam supported by a foundation of a finite depth. Simplified plane models of the foundation are presented for the analysis of finite and infinite beams, respectively. Regarding the model for finite beams, only the vertical dynamic equilibrium is considered. Then the critical velocity obeys the classical formula with an augmented mass that adds 50% of the foundation mass to the beam mass. In the model for infinite beams, the effect of shear is added in a simplified form and then the critical velocity is dependent on the mass ratio defined as the square root of the fraction of the foundation mass to the beam mass. For a low mass ratio, the critical velocity approaches the classical formula and for a higher mass ratio, it approaches the velocity of propagation of shear waves in the foundation. The formula can also account for the effect of the normal force acting on the beam. Deflection shapes of the beam are obtained semi-analytically and the influence of different types of damping is discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Sound and Vibration - Volume 366, 31 March 2016, Pages 325–342
نویسندگان
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