CALCULATION OF IMPACT OF ELASTIC STRUCTURES WITH INTERNAL DAMPING

Abstract

There are some types of structures impact problems where we have to calculate with elastic structures. One of these accidental situations is the impact (drop) of different heavy loads on the existing reinforced concrete slabs and walls of the reactor building during transportation. The other situation is the impact of neighbour building parts of nuclear buildings in the case of earthquake. In these cases it is very important for the reactor hermetic containment to stay in elastic region. It is well known that dynamic stress values are influenced by external and internal damping in the dynamic analysis of elastic structures. There are some adequate numerical methods for the analysis of structures with several degrees of freedom under external damping. An algorithm has been presented in this paper for the analysis of dynamic excess displacements of structures by modal analysis, for cases the effects of internal friction have to be reckoned with. The developed algorithm and numerical method have been tested on examples. The mentioned factors showed important effects, justifying to be reckoned with in the analysis of real structures.