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Seventeenth Statewide Conference on Local BridgesTuesday, October 25, 2011
Training Session: Culvert Design, Analysis - talk 4
Presented by: Peter Eriksson, P.E. Eriksson Technologies, Inc
Culvert Design & RatingIn Accordance with AASHTO
LRFD Specifications
17th Statewide Conference on Local Bridges Preconference Training
October 25, 2011 Syracuse, NY
Presentation Agenda1. LRFD Culvert Design Process2. ETCulvert Overview3. Design Example4. Live Demo5. Questions
2
Culvert Design & RatingIn Accordance with AASHTO
LRFD Specifications
17th Statewide Conference on Local Bridges Preconference Training
October 25, 2011 Syracuse, NY
LoadsPermanent Loads- Dead Loads: DC, DW- Earth Loads: EH, EV, ES
Transient Loads- Live Load: HL93, permit, etc.- Water Load
Structural Modeling
4-Sided (Box) 3-Sided
Limit StatesStrength- Shear, flexure
Service- Cracking- Deflections- Stresses
FatigueExtreme Event
1. LRFD CULVERT DESIGN
Flexural StrengthMust satisfy:Mr = φMn ≥ Mu
Minimum steel
Computing VcBox Culverts- Fills ≥ 2’
• Use 5.14.5.2 for slabs• Use 5.8.3 for walls
- Thickness ≥ 16”, 5.8.3.4.2- Thickness < 16”, 5.8.3.4.1
- Fills < 2’• Use 5.8.3 for all members
3-Sided Structures- For all fill depths:
• Use 5.8.3 for all members
Shear StrengthMust satisfy:- Vr = φVn ≥ Vu- Vn = Vc + Vn
AnalysisPermanent LoadsTransient Loads- Fill Depth- Skew Effects- Surcharge- Dynamic Load Allowance
LRFD 5.8.35.8.3.4.1: Simplified Method
Crack ControlLRFD 5.7.3.4
LRFD 5.8.35.8.3.4.2: General Method
LRFD 5.14.5.3
Distribution ReinforcementLRFD 9.7.3.2
Load RatingManual for Bridge Evaluation (MBE)
Shrinkage & Temperature4-Sided (Boxes)- LRFD 5.10.8
3-Sided- LRFD 12.14.5.8
FatigueLRFD 5.5.3
Environment & LanguageProgram ScopeUser InterfaceModelingLoads & Load CasesAnalysis & DesignDetailingOutput & Reporting
ETCulvert Overview
Program ScopeCulvert Types- Precast or CIP- 3-Sided or 4-Sided (box)
Cells: 1 to 4Spec Support- AASHTO Standard: 17th ed. (2002)- AASHTO LRFD: 5th ed. (2010)- NYDOT provisions
Analysis, Design & Rating
Environment & LanguageLanguage- C# using MS Visual Studio
Environment- Windows- .NET
Platform- Stand-Alone Application- ParaBridge
2. ETCULVERT OVERVIEW
Loads & Load CasesLoad types:- All AASHTO loads- User-defined loads- Live load library
Load Combinations- Per AASHTO- User override
DetailingProvide Bar Sizes and CutoffsScaled SketchesBar Tables3D Interference CheckingExport to CAD
Analysis & DesignFull Structural AnalysisElement Design:- Top Slab- Walls- Bottom Slab
Load Rating- LFD- LRFR
ModelingPhysical:- Up to 4 cells- Vertical walls- Haunches at wall/slab interface
Structural:- 3D space frame engine- Structural model as per current practice- Flexible enhancements for future
Output & ReportingGraphical Output- Concise, well-formatted output- Shop drawing-like output- Graphs of:
• Analysis results• Main design results
Text Reports- Detailed report- Summary report
New Project3. DESIGN EXAMPLE
User InterfaceInterface similar to existing library:- PSBeam- ET Pier- ParaBridge
Three types of views:- Main view- Graphical view- Detailed text reports
Main View (cont’d)
Main View (cont’d)Main View (cont’d)
Main View
Main View (cont’d)
Project SettingsJob Information
Main View (cont’d)
Properties – Materials
LoadsLoads
Properties – Physical Dims
Load & Resistance Factors
Flexural SteelAnalysis Options
Loads
Results - Graphical
3D Rendering – Wireframe3D Rendering – Solid View
Shear Steel
Results – Text (cont’d)
Results – Text (cont’d)Results – Text (cont’d)
Results – Text Report
Results – Text (cont’d)
Results – Text (cont’d)Results – Text (cont’d)
Results – Text (cont’d)
Results – Text (cont’d)
Results – Text (cont’d)Results – Text (cont’d)
Results – Text (cont’d)
4. DEMO
Questions
Results – Text (cont’d)
