Using VIRTIS for Permit Analysis By Terry D. Leatherwood, P.E.
1 Virtis/Opis Technical Update Virtis Opis BRIDGEWare Users Group Meeting 2010 Nashville, Tennessee.
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Transcript of 1 Virtis/Opis Technical Update Virtis Opis BRIDGEWare Users Group Meeting 2010 Nashville, Tennessee.
![Page 1: 1 Virtis/Opis Technical Update Virtis Opis BRIDGEWare Users Group Meeting 2010 Nashville, Tennessee.](https://reader033.fdocuments.us/reader033/viewer/2022042703/56649f385503460f94c54c4e/html5/thumbnails/1.jpg)
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Virtis/OpisTechnical Update
Virtis Opis BRIDGEWareUsers Group Meeting 2010
Nashville, Tennessee
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6.0 Release (July 2008)
Opis R/C Superstructure LRFD Analysis and Specification
Checking
•First increment of the new AASHTO LRFD Engine
Opis Substructure LRFD Analysis and Specification Checking
•First official release of the substructure module
Truss Panel Point Maximum Forces and Concurrent Forces
Reports
•Provide access to load data required for gusset plate analysis
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6.1 Release (Fall 2009)Opis P/S Superstructure LRFD Analysis and Specification
Checking
•Second increment of the new AASHTO LRFD Engine
Virtis R/C and P/S Superstructures LRFR Analysis
•First release of the AASHTO LRFR Engine
Virtis Truss Floorbeam LFD Analysis
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6.1 Release (Fall 2009)
Superstructure Wizard
Analysis Control Settings
LRFD Distribution Factor Wizard
(Incident 1033)
Steel Girder Fishbelly Web Profile
(Incident 1091)
User-defined Truck Library
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6.1 Release (Fall 2009)
Diaphragm Wizard Enhancement
(Incident 3853)
Shear Stirrup Wizard
(Incident 3855)
Allow 1979 AASHTO Prestressed Concrete Shear Code
(Incident 4135)
NSG Vehicle Schematic Printing
(Incident 7421)
Allow LRFD Refined and Approximate Prestress Loss Methods
(Incident 7938)
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6.1 Release (Fall 2009)
Allow Pre-2005 Interim Prestress Loss Calculations
(Incident 8087)
Allow Prestress Transformed Section Properties (3310)
Include Prestress Elastic Losses and Gains (8001)
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6.2 Release (August 2010)Opis Steel Superstructure LRFD Analysis and Specification
Checking
•Third increment of the new AASHTO LRFD Engine
Virtis Steel Superstructures LRFR Analysis
•Second increment of the AASHTO LRFR Engine
Opis 2008 Interim Spec Updates (LRFD)
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6.2 Release (August 2010)
Added Pitch and Gage Input for Steel Beams
Added Control Option for Ignoring Deck Reinforcement for Negative
Moment Capacity
Truss Analysis Enhancements
Added Control Option for Concrete for BRASS LRFR To Rate
Longitudinal Reinf Based on Article 5.8.3.5
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6.2 Release (August 2010)
R/C Hinge
Shear Stud Wizard
Moment Magnification for Substructure
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AASHTO LRFD Spec Checking
Generate the models for each stage of
construction
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AASHTO LRFD Spec Checking
Analyze each stage of construction
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AASHTO LRFD Spec Checking
• Generate influence lines,
• Compute contraflexure ranges,
• Load influence lines
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AASHTO LRFD Spec Checking
Specification Checking
• First pass through each stage
o Compute stresses
• Determine stresses in the unbraced lengths
• Second pass through each stage
o Compute capacities
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AASHTO LRFD Spec Checking
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AASHTO LRFD Spec Checking
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AASHTO LRFR Spec Checking
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Truss Analysis
Longitudinal Truss Floor
Deck-Through Other Truss
Counters ü
Suspended spans ü
Eccentricity (for rating, not analysis) ü ü
Identify deck nodes ü
Element loads ü
Beam and truss elements ü
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Truss Analysis - Counters
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Truss Analysis - Counters
• Nonlinear Analysis – structure model changes as the vehicle moves across the bridge
• Model the counters as tension-only elements – FE engine automatically removes tension-only elements
subjected to compression.
• Generate a load case for each vehicle position to be evaluated (include DL + LL in the load case)
• Scan the analysis results for the critical actions to be used in the rating
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Truss Analysis – Suspended Span
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Truss Analysis – Floor Truss
Floor truss with element loads – stringers positioned between panel points.
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Truss Analysis – Floor Truss
• Model the floor truss with beam elements
• Rate for axial and moment interaction
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Truss Analysis – Floor Truss
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6.3 Release (June 2011)
Virtis Superstructure LFR Analysis
Sunset BRASS from Virtis/Opis
New Detailed LFR report
Addition of Crystal Reports Option for the Report Tool
Substructure LRFR Rating
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6.3 Release (June 2011)
Floor Trusses – Add 3 New Cross Sections
Illinois Nonstandard Gage Enhancement (VI 7991)
New Call Interface To Enable Virtis Ratings From Permit/Routing Software
(Oklahoma)
Allow R/C T-beam Web Thickness To Vary
Montana Corrugated Metal Deck Rating
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6.3 Release (June 2011)
Support for Windows 7
Implement LRFD article 5.8.3.5 in LRFR analysis (AASHTO engine)
API Updates (Superstructure, FE engine, spec-checker)
64 bit Version
2008 LRFR Spec Updates
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6.3 Release (June 2011)
Implement LFR Spec-Check Module for Floor Truss
Michigan LRFR Enhancement
LRFR for Nonstandard Gage Analysis
LRFD Spec Updates
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Spec Updates
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Spec Updates
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Spec Updates
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Critical Bug Report
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Thank you