Validation of simplified models for the analysis of reinforced concrete beams exposed to gas explosions

This paper addresses structural performance of reinforced concrete beams in residential buildings exposed to the effects of explosions. Eighteen beams were defined and analysed with simplified models. Their flexural response was assessed assuming a system with a single degree of freedom, whereas the reaction forces were determined by applying dynamic equilibrium to the members. Simplifying assumptions therefore had to be made, particularly in connection with the resistance function. To validate those assumptions, the beams were subsequently analysed using a finite element model into which complex issues such as material non-linearity or the effect of gravitational loads on dynamically loaded beams can be adequately factored. The numerical results were found to agree closely with the simplified model predictions, particularly with respect to flexural behaviour. The reaction forces calculated differed by about 5-23 %.