Civil Engineering Reference
In-Depth Information
M
3
F(t)
M
2
M
2
M
3
M
1
M
1
M
1
M
1
M
2
harter Stoss
weicher Stoss
Fig. 15.4
Simplified model for a directly hit structure during impact
Fig. 15.5
Replacement model to determine the local load on the impact area as proof of resistance
to punching (from [
5
])
laws for steel and concrete with non-linear stress-strain behaviour in the compres-
sion regime and cracking above the tensile strength are taken into consideration, the
local structural behaviour can be very accurately predicted with such models.
In the past numerous studies on the local behaviour of the relevant structures of
German nuclear power plants were carried out using the computational models
described above. A detailed description of the calculations and results would go
beyond the scope of this contribution. Only a general summary with respect to the
necessary wall thickness is presented here.
Depending on the strength of concrete and level of reinforcement a wall thick-
ness of between 1.50 and 1.80 m is necessary to prevent punching, i.e. the entry of
