Elastic-Workhardening SDF (Single-Degree-of-Freedom) System Subjected to Random Blast Excitations

摘要

An above ground explosion generates a shock wave in air, or airblast, and is accompanied by some duration of strong wind. Especially, the airblast from a nuclear detonation can cause extremely high air pressures and has a relatively long period of duration. When structures under design may be subjected to this sort of loading condition, it is necessary to analyze the behaviors of the structures when subjected to this kind of input to determine whether the structures can survive or not. The present phase of investigation developed a model to characterize the permanent set of SDF, bilinear hysteretic system subject to blast type loading. From that model, the elastic structural response was characterized. A computer program VAR.F was developed compute the moments of critical measures of inelastic response. The means and variances the maximum displacement response of the permanent set and of the energy of dissipation are all useful in probabilistic analyses in structural design or in damage assessment of structures subjected to blast-type loadings.