1 ATC 58 Performance Assessment Calculation Tool (PACT) 2 What is PACT
PACT is intended to be an open-source engineer-friendly software system coded entirely in VB 6.0 and Fortran.
It is a small part of a very large effort (ATC-58)
PACT is an implementation of the PEER PBEE methodology
3 What Goes Into PACT
PACT gathers and stores very Basic Building Information
To the extent needed to define
basic proportions (plan dimensions story heights perimeter length)
Nonstructural systems and components
User specified correlation of damage for performance groups (currently binary)
Extent of other information needed is a function of users expertise
Basic Assessment (very little if any)
Modification of default quantities
Enhanced Assessment (from little to extensive)
Specification of detailed quantities and repair costs
Adding new and modifying existing performance groups and fragility functions
Engineering Demand Parameters
Estimates of story drifts and accelerations at each floor
(H-Dir-1 H-Dir-2 and Non-directional)
4 Performance Group Damage States and Fragilities 5 Correlation of Damage 6 What does PACT do with this information
PACT takes the basic building information provided and
a set of engineering demand parameters for the building (say results of 5 10 or 20 nonlinear dynamic response analyses for a given scenario or hazard level PACT gathers and stores very Basic Building Information and
It performs simulations using Cholesky Decomposition to generate 100s of realizations
Based on these realizations PACT generates probability of loss curves for the entire building a particular floor a particular direction or a single component.
Results are presented in a uniform fashion across various levels of generalization and can be saved and exported to Excel text files and various graphic formats.
PACT is an XML based product and all of the input intermediate and output data is preserved in a hierarchical format that can be retrieved modified and enhanced at any time.
7 Performance Group Damage States and Fragilities 8 Correlation of Damage 9 Let us take a look at it!
Viewer Discretion Is Advised
PACT is a product still under development and every thing about it changes several times everyday.
What I show you is basically the Enhanced Assessment Option. I comment on where and how the Basic Assessment Option would be different
For complete legal jargon see me after this session.
We have the informed consent of the audience. Proceed!
10 A demonstration of PACT as is now 11 PACT Analysis Types
what are the chances of losses of given amount if the building is subjected to ground motion of specific intensity
what are the chances of experiencing more than 10M damage from a M6 on the San Andreas Fault
what are the chances of losses exceeding a given amount over a given time period
12 Time-based Assessment
You already saw how intensity and scenario based assessments are done.
For time-based assessment the user is asked to upload or enter a hazard curve.
13 Time-based Assessment
Then the user is asked to associate a set of previous runs with particular points on the hazard curve.
PACT then performs integrations generating a loss surface and annualized loss curves.
Annualized loss curves may be combined and manipulated exactly as other loss curves.
14 Thank you.
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