In this lesson, you will learn how to update and optimize the preservation model and see how the results are affected by modified cost data.

Update and optimize the preservation model.

1. In the Preservation module, from the Element drop-down list, select element 110 - R/Conc. Open Girder.
2. From the Environment drop-down list, select 4-Severe.
3. Click on the Metric radio button.
4. Click the Elicit Cost module tools button. The Expert Transition Probability Cost Elicitation window will open.
5. At the bottom of the screen, click the Edit Off pencil icon so it says Edit On. You will now be able to make changes.
6. Change the "Unit Cost ($)" for Action 1-Clean and Patch from $269.32 to $20 for State 3-Delams and Spalls. Change the "Unit Cost ($)" for Action 2-Replace from $926.84 to $300 for State 4-Analysis warranted.
7. Click File | Close to close the Cost Elicitation window. A prompt to save changes will appear.
8. Click Yes to save changes to Expert Transition Probability Cost Elicitation.
9. Click the Update module tools button. The Model Update Settings window will appear.
10. Click the checkboxes so only Update Probability Model, Update Just This Element, Use Experts, Update Cost Model, and Backup Before Update are checked. Note that historical inspection data may be used to update the deterioration models if an adequate inspection history exists.
11. Click OK. After running, a prompt will indicate that the deterioration model update run succeeded.
12. Click OK. After running, a prompt will indicate that the Cost Model Update run succeeded.
13. Click OK. Notice that the costs for State 3, Action 1 and State 4, Action 2 have changed.
14. Click the Optimize module tools button. A prompt will ask if you wish to continue.
15. Click OK. The MR&R model estimation process will run. After running, a prompt will indicate that the run succeeded.
16. Click OK. Notice that the recommended actions, designated by the double arrow, for States 3 and 4 have changed.
17. Click the Restore module tools button. A prompt will appear asking if you wish to continue.
18. Click Yes. Notice that the cost for State 3, Action 1 and State 4, Action 2 have been restored to the previous values and the recommended actions for States 3 and 4 have also been restored.

• Both costs and deterioration should be updated before performing the optimization. Generally the deterioration models should be rebuilt rather than updated (leaving the Update Only checkbox unchecked.)

In this lesson, you have learned how to update and optimize the preservation model and how the results are affected by modified cost data.