Inelastic columns subjected to pulse loading.
Defibaugh, Carl F.
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This paper reports an investigation of the dynamic behavior of a pin-ended inelastic column subjected to a half-sine displacement pulse at one end applied with small eccentricity,, The rates of end displacement are such that the effects of axial inertia are considered negligible,, The column is replaced by a lumped parameter mathematical model and the equations for the model are solved by a high speed digital computer. The stress-strain relation during loading is assumed to be of the Ramberg-Osgood type„ Unloading occurs along a line with slope equal to that of the tangent at the origin,, Slendemess ratios of 50, 70, and 100 and two different values of eccentricity are considered in the investigation. The maximum load supported by the column and the residual lateral deflection at the center of the column are found as functions of the displacement pulse height and of the displacement pulse duration. It Is shown that an inelastic column, like the elastic column, can support dynamic loads considerably in excess of the static load capacity. It Is also shown that within the range of pulse durations studied, the smallest residual deflections generally accompany the largest maximum loads.
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