Quantcast Missile-Target Interaction Analysis

 

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Time-History Analysis Method.
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DOE Standard Accident Analysis For Aircraft Crash Into Hazardous Facilities
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Structural Evaluation Criteria. - std30140187


DOE-STD-3014-96
APPENDIX C
W1, V1=
total weight and impact velocity of the aircraft being
considered as a potential missile.
b.
Missile-Target Interaction Analysis
Global response analysis of the target can also be performed by considering the
interaction between the missile and the target instead of using the two-step method
described in Section 6.3.3.2. In this method, the impacting aircraft (missile) is explicitly
modeled with the building structure (target). The aircraft model shall consist of several
mass points interconnected by several nonlinear stiffness springs, and all mass points
shall have an initial velocity equal to the postulated impact velocity. Similarly, the
building model shall consist of several mass points and nonlinear springs, including
massless soil springs representing the foundation flexibility. Depending on the data
available, the aircraft and the building structure can also be represented by detailed finite
elements, instead of lumped masses and equivalent stiffness springs. Also, in either
model, the interface between the aircraft and the target, including the local stiffness and
crushing properties, can be represented in detail. Alternatively, an equivalent nonlinear
interface spring element can be developed from a separate detailed finite element model
and inserted into the overall missile-target interface model.
The response of the above missile-target interface model can be determined using one
of several nonlinear finite element computer codes available in the industry as an initial
velocity problem. The predicted deformation or strain in the various target elements shall
then be compared against the permissible values (see Section 6.3.3.3) to assess if the
target structure can withstand the impact without excessive deformation or collapse.
c.
Target Structure Modeling Guidelines
The type of analytical models used for performing global response evaluations by the
time-history analysis method should depend on the purpose of the analysis and the level
of detail necessary. Generally, an equivalent lumped mass and spring model is
adequate to compute the overall building deformation levels to determine if
C-16


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