ETL 1110-2-563
30 Sep 04
e. Design of upper guide wall for barge impact.
Table D-5
Percentiles for Impact Load
(1) Based on the criteria for return period dis-
Return Period
Impact Force
cussed in paragraph B-3 and Table B-1 of this ETL,
Percentile
years
kips
return periods for the impact design for the upper
10%
1.11
3.02
guide wall are selected as shown in Table D-6. These
20%
1.25
6.03
return periods were selected for this design due to the
30%
1.43
10.07
variations in the experiment data for the different load
40%
1.67
15.52
conditions. The usual and extreme data have a larger
50%
2
22.79
uncertainty since there were limited number of
60%
2.5
32.97
experiments that fit those load levels. Most of the
70%
3.33
47.68
experimental data fell closer to the unusual load
condition, so the return period selected was near the
80%
5
71.45
midpoint of the two bounds for that load condition as
90%
10
120.13
shown in Table B-1.
95%
20
175.94
96%
25
197.26
Table D-6
97%
33.33
223.14
Design Force for Upper Guide Wall
98%
50
260.89
Event Loading
Design Return Period, years
99%
100
327.72
99.25%
133.33
357.13
Usual
10
99.50%
200
395.44
Unusual
150
99.80%
500
508.99
Extreme
500
99.90%
1000
575.08
(2) From the percentiles and data, a graphical
99.98%
5000
731.97
representation of the return periods and loads is
99.99%
10000
796.68
shown in Figure D-11. This graph shows the impact
Note: To convert impact force to kilonewtons, multiply by
4.448.
loads for each return period selected for the design.
These impact forces selected do not include the load
factors for each of the design cases as defined in
EM 1110-2-2104. A summary table with the load
factors included for the design of the wall is shown in
Table D-7.
D-10
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