Design and Constructionftp.dot.state.tx.us/pub/txdot-info/brg/0212_webinar/... · 2012-02-21 ·...
Transcript of Design and Constructionftp.dot.state.tx.us/pub/txdot-info/brg/0212_webinar/... · 2012-02-21 ·...
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Design and Construction
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Design
*What is Lean-on-Bracing?
*Benefits of Lean-on-Bracing
*How to design a Lean-on-Bracing System
Construction & Research Results
*US 82 Underpass @ 9th Street
*US 82 Underpass @ 19th Street EB & WB
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Research Report 1772-1
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*Fewer cross frames –
Significant Cost Savings
*Improved Fatigue Performance
*Reduced Construction Timeline
*Simplifies Future Inspections
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βt = Torsional system brace stiffness
βb = Brace stiffness
βsec = Cross Section stiffness (web
distortional stiffness)
βg = In-plane girder stiffness
1
𝛽𝑏+
1
𝛽𝑔 +
1
𝛽𝑠𝑒𝑐=
1
𝛽𝑡
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Ideal Total Stiffness
Required System Stiffness
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Braces @ Mid-span
Braces @ supports b1
E S2
hb2
Ab
ng Ld3
S3
ng 1 2
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Mbr = Fbr hb = βt Фo
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Fs ng 1 F
Nc
Fs
ng
Nc 2
F
Force in Diagonal
Force in Struts @ Supports
Force in Struts @ Mid-Span
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*Changes in Strain
*Girder Rotations
*Girder Deflections
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Actual
Predicted
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Load Test X2-DT (kips)
Location
(ft.) X2-DB (kips)
Location
(ft.)
Staggered Ahead 0.7 350 -27.8 100
Staggered Back 0.45 220 8.26 220
Side-by-Side South 0.6 350 6.8 240
Side-by-Side North 0.6 140 8.9 120
End to End South 0.5 140 -25.7 120
End to End Central -0.28 220 10.3 100
Load Test X3-DT (kips)
Location
(ft.) X3-DB (kips)
Location
(ft.)
Staggered Ahead 18.5 140 -11.2 140
Staggered Back 11.7 150 -3.6 150
Side-by-Side South 11.4 140 -3.4 140
Side-by-Side North -15.3 140 13.8 140
End to End South 5.5 190 -5.6 180
End to End Central -14 140 36.1 140
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*Design of Lean-on-Bracing is not difficult
*Improves fatigue performance
*Significant cost savings
*Reduces construction time
*It is a conservative method of torsional bracing that works
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*Will Barnett, P.E.
*Todd Helwig, Ph.D., P.E.
*Anthony Battistini, M.S.E.