Blast resistant design of structure to terrorist explosion

The paper deals with the presentation of structure assessment, loaded by explosion of terrorist charge. Evaluations of structures loaded by an explosion based on dynamic displacement and rotation round the central line of plate, wall or beam systems during the action of a dynamic load of this type have been of very topical interest in recent times, as regards the process of evaluating the effects of an explosion on a structure. For structure response calculation the empirical formulas of the explosion load parameters were used. These formulas were derived by the authors for small charges. For determination of explosion effects and structure response were used 3-D analysis, based on detail modelling of the structure. This procedure entails two important uncertainties in the case of bent structures, i.e. a suitable choice of the ductility factor and the material strengthening factor. During very rapid reshaping of the structure, both factors are very important for structure analysis. The damage of these structure parts were therefore weighted accordance with the angle of rotation of middle axis/surface and limit stress state/internal forces of selected structure. The own limit values of angles of failure determined experimentally upon explosion load of brick-layered, reinforced concrete and window glass are compared with results of other authors. The internal forces in the structure are considered as a part of the evaluation of the limit bearing capacity conditions, based on load combinations and reduction by the ductility factor q. The resulting internal forces are then evaluated on the basis of design standards for the appropriate structure material type, or as a variant, also according to its increased strength using factor k(1). An example of a specific building was used to discuss the explosion and the building safety hazard for a terrorist charge.