2 - Structural Precast Concrete Structures in Seismic Areas _USA Experience - Jason Krohn
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Transcript of 2 - Structural Precast Concrete Structures in Seismic Areas _USA Experience - Jason Krohn
Structural Precast Concrete Structures in Seismic Areas
USA experience
INTERNATIONAL SEMINAR ON PRECAST
CONCRETE STRUCTURES
- Precast Structures in the World -
21 October 2010
Structural Precast Concrete Structural Precast Concrete
Structures in Seismic Areas Structures in Seismic Areas
USA experienceUSA experience
INTERNATIONAL SEMINAR ON PRECAST INTERNATIONAL SEMINAR ON PRECAST
CONCRETE STRUCTURESCONCRETE STRUCTURES
-- Precast Structures in the World Precast Structures in the World --
21 October 201021 October 2010Jason Krohn, P.E.
Managing Director, Technical Activities
Precast/Prestressed Concrete Institute
Chicago, IL, USA
PCI - Technical InstitutePCI - Technical Institute
1. Industry Standing
2. Clearly Stated Purpose
3. Broad Professional Involvement
4. Governance and Consensus
5. Research
6. Validation
7. Dissemination
8. Certification of Personnel
9. Certification of Fabrication Process
10.Independent Audits
11.Feedback and Recourse
12.Continuing Commitment
Characteristics of Technical Institutes
PCI’s Continuing CommitmentPCI’s Continuing Commitment
• PCI founded in 1954
• PCI certification established in 1967
• Over 50 on-going technical committees
• Full staff of technical, marketing, and administrative support
• Annual allocated budget
PCI MembershipPCI Membership
• 263 Producer Members
• 88 Supplier Associate Members
• 128 Erector Associate Members
• 2,123 Individual Members– 1,120 Professionals
– 135 Associate Professionals
– 149 Affiliates
– 634 Students
– 85 Life Members
• PCI Journal
• Ascent
• Aspire
• PCI Design Handbook, 7th Edition
• PCI Bridge Design Manual
PCI’s PublicationsPCI’s Publications
US Diaphragm PracticeUS Diaphragm Practice
• Double Tees (Topped or Untopped)
US Diaphragm PracticeUS Diaphragm Practice
• Hollowcore
Observed Diaphragm Challenges Observed Diaphragm Challenges
• 1994 Northridge Earthquake (6.7 Mw)
• 2010 Mexicali, Mexico (7.2 Mw)
Technical Institute CharacteristicTechnical Institute Characteristic
5. Research
• Address problems
• Drive continuous improvement
• Support/fund practical research
• Publish internal research results
• Disseminate external research results
Development of a Seismic Design Development of a Seismic Design
Methodology for Precast DiaphragmsMethodology for Precast Diaphragms
Robert Fleischman, Dichuan Zhang, and Ge Wan
University of Arizona
Clay Naito, Richard Sause, Liling Cao, Rui Ren, and Wesley Peter
Lehigh University
Jose Restrepo, Matt Schoettler, Andrea Belleri, and Carlos Blandon
University of California at San Diego
Jorge Rivera
The Rose School
S.K. Ghosh
S.K. Ghosh Associates, Inc.
Diaphragm Seismic Design Methodology (DSDM) Project
PCI Research & Development PCI Research & Development
Producer Members
University of CaliforniaSan Diego
Jose’ Restrepo, PI
Producer Members
Lehigh UniversityClay Naito, PI
Richard Sause, Co-PI
Industry Advisory Panel
Industry LiaisonS. K. Ghosh, Co-PI
University of ArizonaRobert FleischmanConsortium Leader
DSDM Task Group
DSDM ConsortiumDSDM Consortium
the forces, displacements and deformations for which the
diaphragm should be designed
the existing diaphragm connection details that can
provide this performance
the required stiffness of the diaphragm relative to the
lateral force resisting system (LFRS).
Develop an industry endorsed seismic design
methodology for precast concrete diaphragms including:
Charles Pankow Foundation (CPF) deliverable is the development,
demonstration and codification of a precast concrete diaphragm
system for high seismic zones
DSDM Research ObjectivesDSDM Research Objectives
Half-Scale Shake Table TestHalf-Scale Shake Table Test
7.0 m
4.9 m16.5 m
DSDM Shake Table Test FactsDSDM Shake Table Test Facts
• Shake Table Facts
– 4+ year long research project
– 3.5 = Floor aspect ratio
– 16 significant input ground motions
– 640 sensors to capture response
– 14 cameras to help with visualization
1.080.61MCEBerkeley, CAHigh
Note: DBE = design-basis earthquake; MCE = maximum considered earthquake;
g = acceleration due to gravity; PGA = peak ground acceleration
0.720.41DBEBerkeley, CAHigh
1.140.59DBESeattle, WAModerate
1.490.30DBEKnoxville, TNLow
Scale factorScaled PGA, gTarget levelSiteSeismicity
Structure Level (University of California San Diego)
Diaphragm Level (University of Arizona)
Detail Level (Lehigh University)
Diaphragm seismic force
Diaphragm flexibility limit
Overstrength among diaphragm reinf.
Diaphragm strength and stiffness
FpxFpxFpx
FE Pushover Analysis 3D FE Dynamic Analysis
MDOF Dynamic Analysis Scaled Shake Table Test
√√√√
Strength and ductility characteristics of typical diaphragm details
Connection classification
Full-Scale Detail Tests Hybrid Testing of Joints
Design DeliverablesDesign Deliverables
Appropriate Diaphragm
Design Force, ΩFpx
Structure Level Diaphragm Level Detail Level
Appropriate Capacity wrt
Reinforcement GroupsAppropriate Detailing of
Reinforcing Elements
Design PhilosophyDesign Philosophy
DSDM Project FundingDSDM Project Funding
• US $2.5 million research program
– National Science Foundation
– George E. Brown Jr. Network for Earthquake Engineering Simulation
– Charles Pankow Foundation
– Precast/Prestressed Concrete Institute
– Precast, prestressed concrete industry
Concrete Tech Knife River Central Premix Gibbons Erectors Nelson Stud
Splice Sleeve
Design Procedures and CodificationDesign Procedures and Codification
• 2009 NEHRP Provisions, Part 3– Now published
• ICC-Evaluation Report– ~18 month timeframe
• ACI-ASCE 550 standard document– Reference within ACI 318-14 and IBC 2015
• PCI Journal articles
PCI Journal ArticlesPCI Journal Articles
• For more information:
Winter 2009
Sept-Oct 2005
Nov-Dec 2005
PCI Website: www.pci.orgPCI Website: www.pci.org
Thank you!Thank you!
For more information contact:
Jason Krohn, PE
1-312-786-0300
www.pci.org