ETL 1110-2-563
30 Sep 04
Return Period vs. Impact Load
Return Period
1000
900
800
700
600
500
500
400
300
380
200
100
120
0
0
200
400
600
800
Force
Figure D-11. Return period versus impact load for upper guide wall
Table D-7
Factored Design Force for Upper Guide Wall
Design Return Period
Factored Impact Force
Event Loading
years
Impact Force, kips
kips
Usual
10 years
120
204
Unusual
150 years
380
532
Extreme
500 years
510
561
Note: To convert impact force to kilonewtons, multiply by 4.448.
D-11
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