Response of Damped Orthotopic Stiffened Plates Subjected to a Stepped Triangular Blast Loading

摘要

The response of structural components subjected to a stepped triangular blast loading had been the subject of a great deal of research. Much of these researches had been concentrated on the response of plates to impulsive loads. Complexity of these problem would increases appreciably when effects due to stiffeners configuration and effects of structural damping were considered. In this paper the behavior of orthotropic damped plates with different stiffener configurations subjected to a stepped triangular blast loading is described. The aim of this work is to determine the dynamic response of stiffened orthotropic plates to a stepped trianggular blast loading and to determine the effect of stiffeners configuration and blast loading duration on the plate failure. The natural frequencies of the orthotropic plate were solved from two transcendental equations, while the eigen functions of the system are solved using the Modified Bolotin Method (MBM). The stepped traingular blast loading is further integrated using the Duhamel integration method to find the total dynamic response of the system. The numerical results give new insight into the effect of stiffeners configuration, structural damping and time duration of the blast loading on the plate response.