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Jae H. Chung, Ph.D. and Henry T. Bollmann, P.E.Bridge Software Institute
University of FloridaGainesville, Florida
June 11, 2014
FB-MultiPier Update
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Agenda
• Part I: FB-MultiPier New Features of Upcoming Releases and Medium-Term Development (presented by Jae Chung)
• Part II: Use of Design Tables and Model Showcase
(presented by Henry Bollmann)
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Bridge Software Institute (BSI) Products
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FB-MultiPier Software Program
• Nonlinear Finite Element Analysis Tool for Use in Bridge Design Application• Material nonlinearity and large-deformation (p-delta effect) can be
analyzed using a 3-D frame finite element formulation coupled with soil resistance (4 nonlinear soil springs per each node of FE structure frame).
• Quasi-static and dynamic analyses can be performed either separately or simultaneously.
• Simplified input process in geometric definition of pier components and automated FE mesh (structural skeleton) generation saves time and makes it easy for model calibration.
• Biaxial Moment-Interaction Diagram and easy-to-use materials modeling options are a few to mention.
• Analysis capabilities of coupled soil-structure interaction is the main strength of the program.
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• Flexure • Max positive moment
• Max negative moment
• Shear• Max magnitude shear force
• Force Envelopes • Across all load cases
• Per load case
Features for Upcoming Releases:Pile Cap Summary Forces (V4.19.1)
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• Pile Cap Summary Force Calculations
Pile and cap model Load Case 1 Load Case 2
Illustration of Pile Cap Summary Forces (V4.19.1)
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Pile Cap Summary Forces (V4.19.1)
• 3D results
• Graphical selection of section
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Features for Upcoming Releases: One-Pier Two-Span Model (V4.20)
• Simplified Bridge Model for Dynamic Analysis • A single pier of interest
• Two Adjacent Spans
• 6 DOF’s discrete springs are at both ends of the two adjacent spans
FB-MultiPier schematic representation of a 7-pier configuration
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Illustration of OPTS Model
• Multiple-pier model of SR-20 Apalachicola River Bridge• Eastern channel pier (Pier 59) subjected to lateral dynamic loading
Source: Google maps
N
Source: Google maps
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FB-MultiPier Analysis• Seven-Pier model of SR-20 Apalachicola River Bridge
• Lateral dynamic load on Pier 59
4 sec simulation in 112 min.
Pier 59
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59
4 sec simulation in 5 min.
FB-MultiPier Analysis Model
• OPTS modeling approach• Lateral dynamic load on Pier 59
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Comparison of Analysis Results
• Lateral displacement prediction
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Analysis Results
• Comparison of 7-pier model vs OPTS• 2% difference in maximum D/C values
0
0.1
0.2
0.3
0.4
0.5
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0.8
0.9
1
1 2
D/C
Val
ues
Full-bridge
OPTS
Pier columns Drilled shafts
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Thermal Load Effects in Piers (V4.21)• Implemented in Beta Version of FB-MultiPier
• Can generate AASHTO TU, TG reactions at bearings
FB-MultiPier GUI
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Superstructure Configuration (V4.21)
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Uniform Temperature Loading: TU (V4.21)
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Thermal Gradient Loading: TG (V4.21)
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Span-Thermal Loading : User’s Option (V4.21)
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AASHTO Span-Thermal Loading : User’s Option (V4.21)
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Application of Span-Thermal Loading (V4.21)
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Span-Thermal Loading (V4.21)
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Shallow Foundation Modeling (~2016)
• Spread (or Strip) footings
• Options to model overlying structure and/or pile foundation as usual
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Shallow Foundation Modeling (~2016)• Nonlinear Soil-Structure Interaction Analysis
• Numerical integration of vertical stress through a depth
• Resultant internal forces in finite shell elements coupled with soil resistance
• Computation of ultimate bearing resistance and settlement distribution
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Shallow Foundation Modeling (~2016)• Partially implemented in a Beta Version of FB-MultiPier for academic
education purposes
• Hyperbolic constitutive model (Duncan and Chang)
• Nathan Newmark’s stress superposition method, i.e., Stress-Influence Method
Shallow Foundation Modeling Dialog
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Shallow Foundation Modeling (~2016)• Limitation of existing theories
• Need for strain-based method
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FB-MultiPier Update: Part 2 Use of Design Tables and Model Showcase
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Design Tables
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Example Pier for Design Tables
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Pile Axial Forces
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Max D/C in the Piles
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Max D/C in the Columns
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Pier Cap Shear Design Data
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Shear Envelope
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Moment Envelope
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Data Exporting
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Agenda
• Use of Design Tables
• Model Showcase
• Summary
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FB-Multipier ModelsYOU MADE THESE!!!!!
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Any Pile Layout
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Steel H-Piles and Bracing
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“Thin View” Extra Member Bracing
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Barge Fender at Port Canaveral
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Edited General Pier Model
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Multiple Timber Pile Clusters
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Pipe Piles, Strut, Reduced Pier Cap Stiffness
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Cap Thickened and Some Elements Removed
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6 Soil Sets and 4 Pile Types
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4 Pile Types
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Cap Skewed to Pier
X
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Bonner Bridge (H-Pile Pier)
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X and Y Loads at Every Pile Node
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Oxidation Basin
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Oxidation Basin (Plan View)
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General Pier
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“Thin View”
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Two-Span Bridge
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Eleven-Span Bridge (Curved)
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Typical Pier
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V-Pier
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V-pier (Thin View)
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Interesting…Hmmmm
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Cofferdam
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Fender Dummy Piles
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Loading Dummy Piles
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3D Results Window
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Summary
• Design Tables • Conveniently Report Design Forces and Envelopes
• Model Showcase• Endless Possibilities
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Acknowledgements
Bridge engineers (you!)
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Thank you for your time!