TRANSIENT STRESS ANALYSIS OF SIMPLY SUPPORT BEAM EXCITED UNDER MOVING LOAD

Abstract

ABSTRACTIn this paper, an experimental and numerical study of dynamic deflection and dynamic bending stressof beam structure under moving load has been carried out. The moving load is constant in magnitudeand 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(0.2and 0.25) m/s . The theoretical analysis is based On Euler- Bernoulli theory and Fourier seriessolution. A finite element model of a beam vibrating under moving load is established by ANSYSsoftware. The comparison between the numerical dynamic stresses of beam via ANSYS software withthe experimental results showed that the percentage error of (15%). Effect of the speed and loadvariables on the dynamic stress and dynamic deflection is investigated. It is concluded that theinfluence of variable speed on the dynamic deflection and dynamic bending stress is more than theeffect of variable load on them. On the other hand, the dynamic bending stress is more sensitive to thevariable speed and load than the dynamic deflection. Dynamic bending stress and dynamic deflectiondue to moving load could become significantly higher than those obtained with the stationary loads,thus they must be considered.