LEVEL
1/
PERFORMANCE 2/
CONSEQUENCES
HIGH
5.0
0.0000001
NORMAL
MAINTENANCE
GOOD
4.0
0.00003
MAINTENANCE WITH
TRAFFIC MAINTAINED
ABOVE AVERAGE
3.0
0.001
DOWNTIME FOR
REPAIRS
BELOW AVERAGE
2.5
0.006
FREQUENT OUTAGES
FOR REPAIRS
POOR
2.0
0.023
FREQUENT AND
EXTENDED OUTAGES
FOR REPAIRS
UNSATISFACTORY
1.5
0.07
EXTENSIVE
REHAB
REQUIRED
HAZARDOUS
1.0
0.16
EMERGENCY
ACTION TO
ALLEVIATE HAZARDS
1/ Beta = Reliability Index determined using a lognormal distribution of the performance
function.
2/ Probability of unsatisfactory performance is the probability that the value of the performance
function will exceed the limit state, or that an unsatisfactory event will occur. For example, if the
performance function is defined in terms of miter gate impacts, and the probability of
unsatisfactory performance is .023, then 23 of every 1000 impacts will result in damage which
causes a shutdown.
D-8. Outline for Reliability Analysis Report. The probability based Reliability Analysis Report
(RAR) should be presented in enough detail to fully substantiate the recommended plan. It should
contain complete checked computations and should contain the information described in the
following paragraphs.
a. Pertinent Information. The RAR should contain all data pertinent to the project or
component being evaluated. Pertinent data includes the following:
(1) Color photographs of the component being evaluated. These photographs should be
of sufficient detail to clearly indicate the problem being addressed and should be easily identified
with respect to the location on the structure.
(2) Repair data including cause of damage, method of repair, cost of repair, and the time
in which the structure was out of service to accomplish the repair.
(3) Survey data indicating any observed changes in alignment, and movement of the
component being investigated. The movement should be documented to indicate the changes
D-6
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