Civil Engineering Reference
In-Depth Information
Fig. 15.7
Global model of
a reactor building—
deformed structure due to
an aircraft impact
For some convoy facilities the 0.5 g concept was used for the verification of the
integrity of the primary circuit and other components after an aircraft impact
according to RSK-LL due to induced vibrations. The loads of the components
were replaced by static loads consisting of masses and accelerations of 0.5 g in
all directions. This represents a simplified approach.
Furthermore floor response spectra can be determined to account for the
dynamic processes for the load case airplane crash in the design. Using complex
models which calculate the vibration characteristics of the entire construction as
realistically as possible, the system responses from all possible impact directions
and impact locations are calculated. The foundation and the masses and stiffnesses
of the actual construction play an important role in this. To account for the
inevitable variations in e.g. the foundation parameters the relevant parameters of
the model are varied according to engineering best estimate and covering response
spectra are developed. Comparable to the design case earthquakes a close cooper-
ation between civil and mechanical engineering is necessary. The impact action
effects are transferred to the components via the structure including the ground
where they induce vibrations. The resulting forces from the reaction of the com-
ponents must be reintroduced into the structure and dissipated via the ground.
For those facilities that were explicitly designed in accordance with the RSK-LL
against an aircraft impact the induced vibrations of the components were either
calculated and designed accordingly or the 0.5 g concept was applied. The necessary
