Implementation of an Advanced Macroelement Beam Model under Moving Load (Case Study: Iranian Railroad Projects)

This study aims to present a new three-dimensional moving macroelement for the numerical analysis of beam on elastic foundation under loads as railroad track vibration. Our research is based case conducted in Iranian Railroad Projects. Due involving large number elements, vibration beams tracks with standard elements time-consuming. Two approaches are used and combined this improve realistic models. The former use degrees freedom that can be lieu elements. latter ensure do not approach boundaries model, thus leading boundary errors. Accordingly, element was formulated at different velocities allow correct evaluation trains’ acceleration deceleration effect. linear model. Examples conditions were included evaluate effects parameters. One important aspect formulation asymmetric nature stiffness damping matrices due velocity load. In method, sufficient no end condition effect exists. However, because may more critical parameter than displacement, must determined acceleration, well. achievements include formulating interaction lateral torsional freedom, possibility calculating probable warping cross-sectional slenderness both directly introducing dependent degree also determining model length vibrational Besides, reduction time prominent feature