Virtis / Opis 6.0 Release Notes
- David Foremsky
Date | July, 2008 |
Product | Virtis / Opis, Virtis, Opis |
Versions | 6.0 |
Virtis®, Opis®, Virtis®/Opis® Release Notes
July 2008
Program Limitations
If you are using the Academic or Evaluation version of Virtis, Opis, or Virtis/Opis, be aware that you may only create bridges with the following limitations:
| Academic | Evaluation |
Maximum number of spans: | 3 | 3 |
Maximum span length: | No limit | 200 ft |
Maximum number of girders per structure: | 10 | 8 |
Maximum number of bridges: | No limit | 30 |
Virtis/Opis Version 6.0 - New Features
The following enhancements and additions have been added to Virtis/Opis in Version 6.0:
Opis Reinforced Concrete Superstructure LRFD Analysis and Specification Checking
Opis Substructure LRFD Analysis and Specification Checking
Truss Panel Point Maximum Forces and Concurrent Forces Reports
Project Explorer
Unique Bridge Explorer Folder Names
Virtis Std Engine Enhancements (See Table 2)
Support for Oracle 10.2 and Microsoft SQL Server 2005 databases
POI Integrity Scanner utility program
POI Integrity Scanner is a utility program to review and correct inconsistent data in schedule-based reinforced concrete girder member alternative.
The issue applies to Virtis/Opis versions 5.2.0 through 5.6.0 and it occurs only when a user copies a schedule- based reinforced concrete girder member alternative that has associated points of interest to override the reinforcement development status. The problem is due to a bug in copying schedule-based reinforced concrete member alternatives. During the copy process the copied rows of data in the abw_anal_pt_conc_reinf database table (the table holds information about whether reinforcement sets at a point of interest are fully developed) remain associated with the original member alternative instead of the new member alternative.
The POI Integrity Scanner utility program and its Help file are located inside the Windows Start Menu's Virtis-Opis program folder.
To safeguard the integrity of analysis results in the database, analysis results of an affected bridge cannot be saved until the inconsistent data are corrected. You will receive the following message when you try to save an affected bridge’s analysis results to the database.
The analysis results are not up to date and cannot be saved. The Bridge properties have changed since they were last saved.Please Save the bridge and then save the results.
Open the Bridge Workspace of an affected bridge and save the bridge back to the database will correct the inconsistent data and allow you to save the analysis results.
Virtis/Opis Version 6.0 - Resolved Incidents
The following incidents in the Virtis/Opis Technical Support web site are also addressed in this release:
Incident 5442 - Selecting New When the Window is full of Rows.
Incident 6429 - Resizing of 3d result view controls.
Incident 6567 - longitudinal stiffener ranges - length in inches.
Incident 7759 - Last record is hidden in Bridge Explorer.
Incident 7942 - Virtis 5.5 Bug.
Incident 8114 - Sidewalk cannot cantilever over the deck
Incident 8164 - "n" Value Entry Field Not Present for Floor or Truss Line Superstructure Members.
Incident 8191 - Unable to rate Steel Non-Detailed Beam.
Incident 8192 - Check vehicle at the beginning of truss rating.
Incident 8207 - Virtis Error.
Incident 8238 - Continuous Truss Analysis problem.
Incident 8242 - Wrong AASHTO Spec Referenced.
Incident 8251 - Keyboard entry in Strand Layout window.
Incident 8253 - Error using varying distribution factors.
Incident 8260 - Editable tree items in Spec Check Viewer.
Incident 8265 - Virtis Error.
Incident 8272 - DB Migration Wizard message.
Incident 8277 - Live load distribution factors.
Incident 8281 - Unable to view Pedestrian Live Load Action tabular report.
Incident 8320 - Failed to import LRFD factor.
Incident 8329 – Virtis Opis through truss.
Incident 8370 - Unable to rate floorbeams in Truss-Floorbeam System.
Incident 8380 - Questions on LRFR and P/S losses.
Incident 8406 - Results Graph.
Incident 8430 - Report Tool Header Error.
Incident 8466 - Error in Schematics – Rebar Dimensioning.
Incident 8467 - Save button shouldn't be enabled when Analysis Settings window is opened from Bridge Explorer.
Incident 8469 - Validate travelway at the same elevation is not necessary for Truss line superstructure.
Incident 8514 - Brass/Virtis results do not agree.
Incident 8527 - XML not Displaying for NSG.
Incident 8553 - Bridge Exchange Help Clarification.
Incident 8559 - PS Design Tool.
Incident 8569 - Virtis Crashes when Attempting to Analyze a Truss for an Agency Defined Standard Gauge Truck.
Incident 8622 - Strange grid appearance.
Incident 8646 - XML files should open in Excel.
Incident 8652 - LLDF Shear at Supports - can't verify Virtis Compute results.
Incident 8673 - PS Design Tool shouldn't be enabled when Spec Check window is opened.
Incident 8788 - NSG analysis -> virtis crash.
Incident 8791 - Floorbeam intermediate supports at the start and end of the floorbeam.
Incident 8792 - Debonded Strands in Virtis engine.
Virtis Std Engine
In accordance with a software exchange agreement between AASHTO and PennDOT (Commonwealth of Pennsylvania - Department of Transportation), this software was made available to AASHTO for use within Virtis/Opis. At the time of the exchange this software was referred to as BAR7 version 7.11.0.8.
This is the fourth release of this software module for use within Virtis. For the first release (Virtis version 5.4), it was provided as it was received from PennDOT except for a few minor revisions. For the second release (Virtis version 5.5), rating of continuous reinforced and prestressed concrete beams was added. Rating of prestressed concrete beams was accomplished by merging and enhancing parts of the PennDOT PS3 (Prestressed Concrete Beam Rating and Design version 3.5.0.0) program with Std Engine. For the third and fourth releases, enhancements were implemented to improve compatibility and consistency with the Virtis system.
It is reasonable to expect results from the Virtis Std Engine and BRASS-GIRDER to be similar in most situations. If differences are encountered, please visit the Technical Support website (https://aashtowarebrdr.org/bridge-rating-and-design/support/) for suggested procedures for resolving the differences.
Table 1: Engine capabilities comparison between Virtis Std Engine and Wyoming BRASS-GIRDER in Virtis
Feature | Virtis Std Engine version 6.0 | BRASS-GIRDER version 5.9.3 |
Beam types supported within Virtis | Steel Reinforced Concrete Prestressed Concrete | Steel Reinforced Concrete Prestressed Concrete |
Shear capacity of concrete | Advanced AASHTO equation 8- 48 | Simplified AASHTO equation 8-49 |
Effective slab width | User input or computed according to AASHTO specifications | User input |
Moment-shear interaction | Conservatively uses Mu equal to My in AASHTO 10.48.8.2 even when section is compact | Uses Mu in AASHTO 10.48.8.2 when section is compact |
Self weight of variable depth girder | Applied as uniform load (total weight of girder divided by length of girder) | Applied as trapezoidal load |
Fixed supports and spring supports | Not handled | Handled |
Pedestrian live load | Applied as a stage 2 dead load so the rating factor reflects the reduced capacity available for live load | Rating factor computed for pedestrian live load applied as an independent vehicular live load |
Member stiffness used in structural analysis (Note: This stiffness affects how loads are distributed in the structural analysis. It does not affect how the stresses or strengths are computed.) | Uses positive flexure properties (beam + slab) over entire beam length | Uses positive flexure properties (beam + slab) in positive moment regions and negative flexure properties (beam + rebar) in negative moment regions |
Modular ratio used to calculate prestressed beam composite section properties | Based on compressive strength of beam concrete at 28 days | Based on compressive strength of beam concrete at initial prestress |
Stresses and strengths of prestressed concrete section | Uses transformed section properties | Uses gross section properties |
Shear strength Vci computation (AASHTO 9.20.2.2) | No limit on Mcr/Mmax | No limit on Mcr/Mmax or limit Mcr/Max to 1.0 |
Externally applied loads used to calculate Vi and Mmax for AASHTO equation 9-27 | Factored load effect due to all loads other than the beam weight and prestress | Total factored effect - unfactored dead load effect |
Prestressing force along the length of the beam | Varies linearly from zero to a force corresponding to stress fse at the transfer length and to a force corresponding to stress f*su at the development length and beyond | Constant |
Prestress beam end regions (at distance h/2 from face of support) shear consideration according to AASHTO 9.20.1.4 | Yes | No |
Use flexural strength reduction factor k (AASHTO Manual 6.6.3.3) when φMn is less than 1.2 times cracking moment M*cr | Yes | No |
Support positions for prestressed beam analysis | Uses simple span bearing span lengths for DL1 analysis and centerline of support span lengths for DL2 and LL analyses. Analysis points considered for DL1 analysis correspond to tenth points of the continuous span lengths used for DL2 and LL analyses. Analysis points for which the results are reported correspond to tenth points of the continuous span lengths. | Uses the same support positions, simple span bearing span lengths or centerline of support span lengths, for all stages. Non- composite stage is considered as simple spans and composite stage as continuous spans. |
Analysis points of interest | Predefined such as tenth points of continuous spans, section property ranges, change in reinforcements, h/2 distance from support, drape points, etc. | Tenth points and user-defined points of interest |
Final allowable tensile stress in the concrete after losses | Uses the LFD Final allowable tension in the Stress Limit Sets - Concrete window | Uses the INVY ASD Factors P/S Concrete Tens. in the Member Alternative window |
f'ci used in the prestress loss due to elastic shortening calculation | 0.85 f’c | Uses the Initial compressive strength in the Bridge Material – Concrete window |
Cross section used in analysis point of interest | Uses the cross section with smaller reinforcement area | Uses the cross section with smaller gross moment of inertia |
Table 2: List of Virtis Std Engine enhancements scheduled for Virtis version 6.0
Incident No. | Virtis Std Engine version 6.0 |
6682 | Increase number of vehicles in a single run |
6861 | Show output and rating factors for both Lane and Axle in the Analysis Results window |
6954 | Allow user to enter effective slab widths along the length of splayed girder |
7802 | Provide means to obtain rating results at user-defined points of interest for PS girder |
7923 | Add corrections made to PennDOT's BAR7 v7.12.0.0 to Virtis Std Engine |