ATC-63 Quantification of Building System Performance and Response Parameters ATC-63 FEMA P-695 Quantification of Building Seismic Performance Factors LATBSDC Annual Meeting May 7, 2010 ATC-63 FEMA P FEMA P - - 695 Quantification of 695 Quantification of Building Seismic Performance Building Seismic Performance Factors Factors LATBSDC Annual Meeting May 7, 2010 Jon A. Heintz Applied Technology Council Director of Projects
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ATC-63 Quantification of Building System Performance and Response Parameters
ATC-63
FEMA P-695 Quantification of
Building Seismic Performance
Factors
LATBSDC Annual Meeting
May 7, 2010
ATC-63
FEMA PFEMA P--695 Quantification of 695 Quantification of
Building Seismic Performance Building Seismic Performance
FactorsFactors
LATBSDC Annual Meeting
May 7, 2010
Jon A. Heintz
Applied Technology Council
Director of Projects
ATC-63 Quantification of Building System Performance and Response Parameters
• Project Context
• Background/Scope/Basis of Methodology
• Methodology Overview
• Example Application to Concrete Moment
Frame Systems
• General Findings and Observations
OutlineOutlineOutline
ATC-63 Quantification of Building System Performance and Response Parameters
• Primary – Create a methodology for determining Seismic
Performance Factors (SPF’s) “that, when properly
implemented in the design process, will result in the
equivalent earthquake performance for buildings different
lateral-force-resisting systems”
• Secondary – Evaluate a sufficient number of different
lateral-force-resisting systems to provide a basis for Seismic
Code committees (e.g., BSSC PUC) to develop a simpler
set of lateral-force-resisting systems and more rational
SPF’s (and related design criteria) that would more reliably
achieve the inherent earthquake safety performance
objectives of building codes
ATC-63 Quantification of Building System Performance and Response Parameters
• New Buildings – Methodology applies to the seismic-force-resisting system of new buildings and may not be appropriate for non-building structures and does not apply to nonstructural systems.
• NEHRP Provisions (ASCE 7-05) – Methodology is based on design criteria, detailing requirements, etc. of the NEHRP Provisions (i.e., ASCE 7-05 as adopted by the BSSC for future NEHRP Provisionsdevelopment) and, by reference, applicable design standards
• Life Safety – Methodology is based on life safety performance (only) and does not address damage protection and functionality issues (e.g., I = 1.0 will be assumed)
• Structure Collapse – Life safety performance is achieved by providing an acceptably low probability of partial collapse and global instability of the seismic-force-resisting system for MCE ground motions
• MCE Ground Motions – MCE ground motions are based on the spectral response parameters of the NEHRP Provisions (ASCE 7-05), including site class effects
Scope and Basis of the MethodologyScope and Basis of the MethodologyScope and Basis of the Methodology
ATC-63 Quantification of Building System Performance and Response Parameters
Ground Motion Record SetGround Motion Record SetGround Motion Record Set
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
0 0.5 1 1.5 2 2.5 3 3.5 4
Period (seconds)
Spectral Acceleration (g)
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Standard Deviation - Ln (Sa)
Median Spectrum - Far-Field Set
• Far-Field Record Set:
R > 10 km
• Large Magnitude Events:
Moment magnitude, M > 6.5
• Equal Weighting of Events: ≤ 2 records per event
• Source Type: Both Strike-Slip and Thrust Fault Sources
• Site Conditions: Rock or Stiff Soil Sites, Vs > 180 m/s
ATC-63 Quantification of Building System Performance and Response Parameters
Technical Approach of the MethodologyTechnical Approach of the MethodologyTechnical Approach of the Methodology
• Conceptual Framework – Methodology incorporates cutting edge (nonlinear/probabilistic) performance-based analysis methods while remaining true to the basic concepts and definitions of seismic performance factors of ASCE 7-05 and the NEHRP Provisions(e.g., global pushover concept as described in the Commentary of FEMA 450)
ASCE 7-05/NEHRP
Design Provisions
(e.g., base shear)
V = CsW
Performance-Based
Analysis Methods
Probabilistic Collapse
Fragility
Nonlinear (Incremental)
Dynamic Analysis
ATC-63 Quantification of Building System Performance and Response Parameters
Overview of the MethodologyOverview of the MethodologyOverview of the Methodology
ATC-63 Quantification of Building System Performance and Response Parameters
Peer ReviewRequirements
Test Data Requirements
Design Information Requirements
Analysis
Methods
Ground
Motions
Methodology
Elements of the MethodologyElements of the MethodologyElements of the Methodology
ATC-63 Quantification of Building System Performance and Response Parameters
Notional Flowchart of ProcessNotional Flowchart of ProcessNotional Flowchart of Process
Develop
Design Rules
Develop
Test Data
Notes
“Homework” phase
Characterize System
BehaviorDefine Archetypes
YesPeer Review applies
to total processReview and Documentation
P[Collapse] < LimitTrial value of the R
factor acceptable?
Evaluate System PerformanceEvaluate CMR values
(and overstrength)
Perform Pushover
and NDAAnalyze Archetype Models
Design archetypes
(w/trial of R Factor)Develop Archetype Models
No
ATC-63 Quantification of Building System Performance and Response Parameters
Notional Collapse Fragility – One Data PointNotional Collapse Fragility Notional Collapse Fragility –– One Data PointOne Data Point
-0.6
-0.3
0
0.3
0.6
0 2 4 6 8 10 12 14 16 18 20
Time (Seconds)
Acceleration (g's)
1989 Loma Prieta - Corralitos (128 deg.)
Scaled Ground
Motion Record
+Joe’s
Beer!Beer!
Food!Food!
Building
(Joe’s Bar)
Incipient
Collapse
=
Evaluation of a individual structure (one configuration/set
of performance properties) to failure using one ground
motion record scaled to effect incipient collapse
ATC-63 Quantification of Building System Performance and Response Parameters
Greater uncertainties will require larger median collapse margins
to satisfy maximum collapse probability at MCE
Collapse
Probability at
MCE?
ATC-63 Quantification of Building System Performance and Response ParametersATC-63 Quantification of Building System Performance and Response Parameters
Table 3-1 Quality Rating for Design Requirements
Completeness and
Robustness
Confidence in Basis of Design Requirements
High Medium Low
High. Extensive safeguards against poor behavior. All important design and quality assurance issues are addressed.
(A) Superior (B) Good (C) Fair
Medium. Reasonable safeguards against poor behavior. Most of the important design and quality assurance issues are addressed.
(B) Good (C) Fair (D) Poor
Low. Questionable safeguards against poor behavior. Many important design and quality assurance issues are not addressed.
(C) Fair (D) Poor --
Quality RatingsQuality RatingsQuality Ratings
ATC-63 Quantification of Building System Performance and Response Parameters
Total Collapse UncertaintyTotal Collapse UncertaintyTotal Collapse Uncertainty
• Design Requirements: A-Superior
• Test Data: B-Good
• Nonlinear Model: A-Superior
Uncertainty - Nonlinear Model A - Superior
Uncertainty - Quality of Design Requirements Uncertainty - Quality of Test Data A - Super. B - Good C - Fair D - Poor
A - Superior 0.55 0.55 0.65 0.80
B - Good 0.55 0.60 0.70 0.85
C - Fair 0.65 0.70 0.80 0.90
D - Poor 0.80 0.85 0.90 1.00
ATC-63 Quantification of Building System Performance and Response Parameters