The TWIA Expert Panel held a public meeting to inform the public about the progress of the panel’s work thus far, to allow the public to observe the panel discussing its work, and to give the public an opportunity to comment and ask questions.
Presentation on Recommendations:
Bob Bailey, Exponent, Inc. Representative
- Commissioners discretion to use ideas
- Meeting is used to propose ideas
- A flow chart is used to understand the formation of the data base
- Recommendations have been made and will be presented to the commissioner
- Information serves as input
- Hazards module- times the history of the wind and surge that occurs
- Damage estimation module- input from structural features and outputs from hazard module to see the damage done
- Economics loss module- takes into consideration industrial losses
- A report is then generated
- Policy holder to review the output then provides opportunity to recalculate the estimates
- Policy holder input is important and taken into consideration
Andrew Kennedy, Member of Board of Directors for Applied Technology Council
- Environmental inputs that will be needed then will lead to slab cases
- There is a need for full wind and surge information corresponding wave and surge history
- Most important recommendation- observational wind field that is based on observations and will help produce history
- Waves and surge- larger scale model
- Recommending to use wind model and combine components from large scale models
- Computational models take a while to set up and need to be up before storms
- Modules are developed but the implementation is a longer process
- Damage estimation module- requires computations and determines why the structure collapsed
- Wind damage for computing losses that is taken when there is the probability of surge reaching its maximum
- Recommend using a procedure made for Texas, using measurements
Bill Coulbourne, Director of Wind and Flood Hazard Mitigation
- Wind damage
- Looks at loads from ASCE 7- minimum design standards
- Need info about internal info from the building
- Looking at pressures for both roofs and walls
- Gust effect factor takes the building in the account and brought from ASCE 7
- There is a lot of variability in wind pressures
- Looking at the pressures of the roof is important
- Module takes in a lot of different variations
- Resistance is provided by the strength of a material
- Develop performance equations have to be made
- Many performance functions are looked at and interior damage- following FEMAS approach
- Resistances- are in pounds
- Research of the literature has been done
- 30 experts were asked on variability
- There are 3 different variability’s that are all in the model
- Additional variability in different parts of the building- roof, wall, to foundation
- Variability is created by age and deterioration (looked at in 5yr increments)
Sam Amoroso, Forte & Tablada, Inc. Representative
- Economic Loss Module
- TWIA should rely on adjusters that would estimate the amount of work and cost
- Economic Loss Module will include estimates for the interiors
- TWIA adjusters are to have better knowledge on what is in the interior
- TWIA should not rely on a module
- Report generation module- requires info from sources
- Data from wind and storm search hazards would be included
- Economic loss results would be determined by TWIA
- Report to be archived with TWIA with policy holder to adjust any inputs
- Slides are shared on a specific case
- Peak of a surge can occur before the wind
- Methodology says that the slabs can be destroyed by storm surge and waves
- Methodology on a property worked out well but that may have just been luck
- There is the ability to collect average damage ratio
- In general there is a comparison to the average damage module
Bob Bailey, Exponent, Inc. Representative
- Shares summary for meeting- methodology purpose
- Get a contract in place with someone that will work with you
- Don’t wait until 7 day warning- do advanced preparation
- Acquire field measurements
- Continually validate the module
- If Methodology is adopted see how it worked as a tool
Peer Review:
- TDI to solicit peers to find individuals
- Finalized at end of month
- 28 day review period to provide feedback and then we will respond
- Later to present model with any adjustments
- Residential Slab only
Open time for questions:
- Staff Answer- In the case of the structures, we are clear on what we think matters