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IMPLEMENTING SEISMICALLY ROBUST ACCELERATED BRIDGE CONSTRUCTION in CALIFORNIA
Mark Mahan, PhD, P.E.Ron Bromenschenkel, P.E.
California Department of Transportation
BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 1
ISU Spring Transportation Seminar SeriesApril 1, 2016
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 2
San Mateo-Hayward Bridge Widening (2002)
• Up to 270 feet of structure completed per week • 5.15 mile long portion of south bay crossing• PC Hollow Piles• PC Cap Tubs• PC Girders• PC Deck Forms
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 3
California Experience:• Three major California earthquakes.• Influence of earthquakes on Caltrans’ Seismic Design Criteria
(SDC).
Concepts of “Confinement”, “Continuity”, and “Balance” in the SDC.
Proof of Ductility in California Columns.
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 4
1971 San Fernando EQ: Collapse of multiple structures including Route I-5/I-405 Separation Structure resulted in a drastic increase in “Confinement” reinforcement in columns.
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 5
Caltrans’ new confined columns
Confinement:Caltrans’ SDC 4.1.1
∆C > ∆D
Caltrans’ pre- 1971 columns,1994 damage.
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 6
Caltrans’ post-1989 Column Testing
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 7
Caltrans’ post-1989 Column Testing
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 8
1989 Loma Prieta Earthquake: The San Francisco-Oakland Bay Bridge lost a deck segment due to insufficient hinge seat.
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 9
1989 Loma Prieta Earthquake: The Cypress Viaduct collapsed partly due to excessive joints in the structure
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 10
Caltrans’ columns and shafts, new construction
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 11
Caltrans’ hinge seat, before 1971
Continuity:• Caltrans’ SDC 7.2.5.4 and 7.8.3
Equation 7.5, minimum 24” seat width for in-span hinges and Equation 7.46, minimum 30” at abutments.
• Caltrans’ Cast-In-Place, post-tensioned box girder bridges have excellent continuity and framing. They meet the SDC requirements.
• Do Pre-Cast bridges meet the continuity requirements?
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 12
1994 Northridge Earthquake: I-5/SR-14 collapse, lack of stiffness and mass “Balance”from bent to bent.
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 13
1994 Northridge Earthquake: I-5/SR-14 collapse.
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 14
BENT 2
BENT 3
BENT 4
BENT 6
BENT 5
m2 m5m3 m4 m6
k2k3 k4 k5
k6
FRAME 1 FRAME 2
T1 T2
BENT 3
k2 k1
Caltrans’ Seismic Design Criteria
Balance:Caltrans’ SDC 7.1.1, Any two bents or columns:
Adjacent bents or columns:
50.0≥
imejk
jmeik
75.0≥
imejk
jmeik
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 15
UCSD 4-foot Diameter Column Test
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 16
UCSD 4-foot Diameter Column Test
Test IDEQ
Record Magnitude Scale Table PGA Target Ductility
2 Loma Prieta 1 6.9 1.0 0.409 2
3 Loma Prieta 2 6.9 1.0 0.526 4
5 Kobe-Takatori 6.9 -0.8 -0.533 8
7 Kobe-Takatori 6.9 1.0 0.646 ?
8 Kobe-Takatori 6.9 -1.2 -0.829 ?
9 Kobe-Takatori 6.9 1.2 0.819 ?
10 Kobe-Takatori 6.9 1.2 0.851 ?
Videos 3, 5, 10 are shown as examples of performance
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 17
Video 3 at ductility demand of 4Video 5 at ductility demand of 8Video 10 at ductility demand beyond 8
UCSD 4-foot Diameter Column Test
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 18
• Single Column Bents supported on fixed foundation μD ≤ 4
• Multi-Column Bents supported on fixed or pinned footings μD ≤ 5
• Columns designed for ductility values of 4 and 5 are proved to perform to ductility values of 8 to 10 in laboratory testing.
• CIP post-tensioned box girder and properly detailed PC bridges can meet the above seismic requirements.
Summary of Cast-In-Place (CIP) practice
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 19
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 20
0
5,000,000
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20,000,000
25,000,000
30,000,000
35,000,000
40,000,000
1980 1985 1990 1995 2000 2005 2010 2015
Western States Population: US Census Bureau
.California
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.Utah
.Nevada
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CA
WAAZUTNVAK
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 21
CISN ShakeMapLoma Prieta EQM6.9October 198963 lives lost$ 6,000,000,000 damage
CISN ShakeMapNapa EQM6.0August 20140 lives lost$ 1,000,000,000 damage (est)
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 22
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 23
ABC Column Connection Research
Testing at University of Nevada, Reno
PC Column with partially debondedbars plunged into UHPC filled voids
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 24
PC Girder Continuity through Bent Caps
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 25
PC Girder Continuity through Bent Caps
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 26
ISOLATED ABC BRIDGE LIFE CYCLE COST ANALYSIS
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 27
ISOLATED ABC BRIDGE LIFE CYCLE COST ANALYSIS
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 28
PC Shear Key Concept (2013)
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 29
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 30
Proposed Type II shaft with PC Column
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 31
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 32
Patch Spalls, 1009, 23%
Potholes, 90, 2%
Rehab, 100, 2%
Resurface, 109, 3%
Overlay, 188, 4%
Methacrylate, 2646, 59%
Replace, 2, 0%Misc, 307, 7%
CA BRIDGE DECK REPAIR 2005-2015
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 33
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 34
Caltrans positive moment connections for joining PC girders to bent capsare based on proof testing done at Iowa State University.
Six details are being developed to provide designers with options atdifferent ABC (and non-ABC) sites.
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35
Strand tails lapped and hooked, then tied into place for longitudinal continuity
PC Girder ContinuityHwy 50, El Dorado Hills, CA (2013)
BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 36
PC multi-column bentsusing pinned bases canoffer construction fit-uptolerance challenges. .
This detail allows the PCcolumn to be spun orshifted to better alignwith top of column barsbeing inserted into a PCcap.
PC Column with adjustable Pipe Pin base
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37
Excerpt from two-span Caltrans ABC pilotproject featuring PC columns, inverted T bentcap, and PC girders. Looped strand girdercontinuity detail used.
BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS
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38BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS
Excerpt from second two-span Caltrans ABC pilotproject featuring PC columns, drop-bent cap, and PCgirders. Hooked strand girder continuity detail used.
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 39
Comments?
Questions?
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BACKGROUND • RESEARCH • DETAILS • GUIDANCE • PROJECTS 40
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6’-diameter column/shaft test at UCLA
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6’-diameter column/shaft test at UCLA
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