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Updating ASCE 31 and 41 A Report from the ASCE Standards Committee on Seismic Rehabilitation Chris Poland, S.E. – Chair Robert Pekelnicky, S.E. – Vice-Chair Degenkolb Engineers ASCE Standards for Seismic Rehabilitation ASCE 31 Seismic Evaluation of Existing Buildings Deficiency based

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updating asce 31 and 41 a report from the asce standards committee on seismic rehabilitation

Updating ASCE 31 and 41A Report from the ASCE Standards Committee on Seismic Rehabilitation

Chris Poland, S.E. – Chair

Robert Pekelnicky, S.E. – Vice-Chair

Degenkolb Engineers

asce standards for seismic rehabilitation
ASCE Standards for Seismic Rehabilitation

ASCE 31 Seismic Evaluation of Existing Buildings

Deficiency based

Three tiered evaluation procedure

Performance based

Focuses on validating buildings

2003

ASCE 41 Seismic Rehabilitation of Existing Buildings

Tool kit of procedures and acceptance criteria

Force based and displacement based analysis

Systematic and Simplified procedures

Performance based

2008

asce 31 41 update
ASCE 31/41 Update
  • Committee reconvened on December 9 and will operate under new format similar to ASCE 7.
  • Updates to ASCE 31 and 41 in 3 years
  • Combine and/or streamline ASCE 31 and 41 for a seamless transition.
asce 31 issues
ASCE 31 Issues
  • Step function between ASCE 31 and 41
  • Does not use same seismic hazard as 41
  • Nonstructural Checklists too extensive
  • Tier 1 Life Safety Checklists could be simplified
  • Does not address resiliency and down time, but could with some additions
asce 41 issues
ASCE 41 Issues
  • Does not currently use RTE hazards
  • Global damage parameters needed
  • SSI procedures need refinement
  • Many acceptance criteria overly conservative
  • LSP is overly conservative
  • Solicit and accept modifications from materials standards organizations
  • Case studies needed
  • Transition from guideline to standard may have resulted in unnecessary requirements
slide6

Policies for Achieving Resilience

  • Advocate for a Resilient City through transparent hazard declaration.
  • Refine and declare the hazard level and performance categories used in design.
  • Predict performance accurately
  • Tailor performance to response needs
  • Residential structure must allow occupants to shelter in place
  • Keep the big picture in mind
  • Speak with a common voice
  • Refer to 2/09 Urbanist at www.spur.org