ATC 58 Performance Assessment Calculation Tool PACT

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
• Probability of
• Death
• Dollars
• Downtime

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)
• Structural system
• Nonstructural systems and components
• Contents
• 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

• Intensity-based assessments
• what are the chances of losses of given amount
  if the building is subjected to ground motion of
  specific intensity
• Scenario-based assessments
• what are the chances of experiencing more than
  10M damage from a M6 on the San Andreas Fault
• Time-based assessment
• 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.