Abstract
ABSTRACT
In this paper, an experimental and numerical study of dynamic deflection and dynamic bending stress
of beam structure under moving load has been carried out. The moving load is constant in magnitude
and travels at a uniform speed. The dynamic analysis of beam-type structure is done by taking three
(39.24, 58.86 and 78.48) N concentrated loads; each one of them travels at two uniform speeds(0.2
and 0.25) m/s . The theoretical analysis is based On Euler- Bernoulli theory and Fourier series
solution. A finite element model of a beam vibrating under moving load is established by ANSYS
software. The comparison between the numerical dynamic stresses of beam via ANSYS software with
the experimental results showed that the percentage error of (15%). Effect of the speed and load
variables on the dynamic stress and dynamic deflection is investigated. It is concluded that the
influence of variable speed on the dynamic deflection and dynamic bending stress is more than the
effect of variable load on them. On the other hand, the dynamic bending stress is more sensitive to the
variable speed and load than the dynamic deflection. Dynamic bending stress and dynamic deflection
due to moving load could become significantly higher than those obtained with the stationary loads,
thus they must be considered.
