Diagnosis of Civil Engineering Structures Under Severe
Accidental Loading
Dr. Charles Shahrokh Ghavamian, NECS
Nuclear facilities, which undergo licence renewal, modifications,
or decommissioning may require studies to demonstrate their
capacity to withstand the consequences of different type of
accidents among which the impact of heavy hard objects (i.e.
containers, steel plates, structural element, etc).
In literature these are commonly named as hard, low velocity
missiles, opposite to situations such as airplane impact,
which are considered high velocity, soft missiles.
This presentation concerns several examples of studies using
RADIOSS to demonstrate the capacity of the software to simulate
strongly non-linear mechanisms necessary to study the safety
of reinforced concrete structures to resist drop load accidents.
After a brief presentation of the mechanical model and finite
element modelling and material constitutive laws, the results
are presented and commented. Conclusions are confronted to
more simplified analysis techniques to evaluate their quality.
In fact, while the literature is quite rich in experimental
data and analytical formula for high velocity collisions,
the situation is the opposite for low velocity impacts. That
is why 3D non-linear transient analyses carried out by RADIOSS
are compared to simplified engineering techniques.
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