Elasticplastic beam-on-foundation subjected to mass impact or impulsive loading
A mass-spring model is developed to analyze elasticplastic beam-on-foundations (BoFs) under mass impact or impulsive loading. A general analytical procedure is proposed and it is shown that three phases, i.e. a transient phase, an elastic unloading phase and a final elastic vibration phase, exist in an elasticplastic BoF after the dynamic loading. Similar to the quasi-static analysis given by Chen and Yu [Int. J. Mech. Sci. 42 (2000) 2261], an elasticplastic BoF under dynamic loading may undergo various deformation scenarios, depending merely on some dimensionless parameters. Both its own characteristics and the external loading parameters govern the dynamic behavior of an elasticplastic BoF. The plastic hinge migration and the propagation of plastic deformation in the foundation occur in both quasi-static and dynamic cases; however, the failure modes of elasticplastic BoFs are different under those two loading conditions.
mass impact impulsive loading mass-spring model elasticplastic bof dynamic behavior