Plastic Dynamic Response On Reinforced Concrete Structure Subjected To The Explosive Loading

The plastic dynamic response of the reinforced concrete beam-slab structure subjected toexplosion load is the major project of the study on the structural antiknock dynamics, alsomeans a lot to both theory and practical engineering. This paper did research on the plasticstress and deformation response of the reinforced concrete beam subjected to explosion load,taking a simply supported beam as an example. Main contents are as follows:1. The explosion load on architectural structure was discussed, and both unconstrainedand constrained explosion loads were simply introduced. The affection of the wholearchitectural structure subjected to explosion shock wave was described macroscopically, andcomparisons of a few common simplified models of explosion load overpressure schedulecurve and their parameters were made.2. Rigid-plastic model was used to do research on the dynamic response of the reinforcedconcrete simple-supported beam. The explosion load was simplified into triangular loaddistribution with both ascent stage and descent stage, applied to the reinforced concretesimple-supported beam in the form of uniform load, thus researching the relationship betweenthe maximal deformation and the time. Based on the relevant theory of plastic hinge, therelationship between the location of plastic hinge and the motion law of the beam wasestablished, then the transformation law of deflection, velocity and rotation etc. parameters ofthe beam over time was obtained. Finally, the maximum residual deflection formula of simplysupported beam subjected to the explosion load was obtained.3. Based on the nonlinear finite element technique, the dynamic response of reinforcedconcrete beam subjected to the explosion load was analyzed with LS-DYNA, the large-scaleexplicit dynamic finite element analysis software. Taking the reinforced concretesimple-supported beam in a real experiment as an example, the propagation process of theshock wave and the changing process of the beam’s stress and strain after the explosion wasreconstructed with the numerical simulation of LS-DYNA. Comparing the numerical resultswith that theoretical results, the changing condition of the beam’s stress and stain agreed well.