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DOE-STD-3014-96
APPENDIX C
or
fy
fyd  2 1
0.59
fc
Pv
(C 6-18)
c
0.2
0.9
L
where:
Pv
=
punching shear load (lb);
c
=
side length of the loaded area (in.) ( = square root of loaded area);
d
=
effective depth of the section (in.);
=
reinforcement ratio;
f'c
=
concrete compressive strength (psi);
L
=
distance between adjacent loads acting on the same panel (may
be taken as infinity for typical aircraft engine impact, unless more
than one engine are postulated to impact a given panel
simultaneously);
and where fy
=
yield strength of reinforcement.
C.6.3.3 Global Response Evaluation.
C.6.3.3.2 Time-History Analysis Method.
a.
Determination of Force Time-History by Scaling
Impact force time-histories for a number of actual aircraft types have been developed
using methods which are similar or identical to Riera's method (Reference 10) outlined in
Section 6.3.3.2. These are shown in Reference 2. In the absence of sufficient data on a
specific aircraft, its impact forcing function can be approximated by scaling one of the
forcing functions given in Reference 2. The aircraft type selected should be one whose
C-14


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