VERIFICATION OF THE LOCAL STRUCTURAL RESPONSE OF BUILDING STRUCTURES IN THE ANCHORAGE AREAS OF HEAVY COMPONENTS

In both nuclear and non-nuclear areas of power plants, sections of str uctures, parts of systems and components are attached to walls and flo ors by means of anchor plates with bolts, anchor sleeves and bolts and through bolts arranged either in groups or individually. In order to simplify the determination of the transfered vibrations induced by ext ernal events (e.g. earthquake, aircraft crash), it is normally assumed that the nodal point between component and concrete possesses rigid b ody characteristics and the building structure (walls, floors) is also inflexible in the anchorage area. In the course of the parametric stu dies performed, the nonlinear effects on the anchorage area of a compo nent (in this case an anchor plate and concrete slab) were calculated and the effect of these on the actual vibration behavior and the local structural responses of the building structure at the place of instal lation of heavy components were investigated. The investigations perfo rmed reveal that by taking into account the local behaviour in the anc horing point, it is possible to reduce the dynamic response considerab ly. More detailed examination of the influence of additional parameter s (especially of the geometry of the anchor plates and anchor bolts an d their material characteristics) will require further investigations aimed at establishing the characteristics of typical anchor plates.