Changes to this page are noted in yellow.
Bridge - Your Responsibilities
- Bridge Special Assignments will initiate and create the
bridge in the database. The data marked in RED in the "Bridge Description Information" will be
populated in advance. The designer will be responsible for
any data fields left blank except Year Built, this will
be populated at a later date. Contact Bridge Special Assignments with any questions regarding
- The assigned designer will have to notify the Virtis
Opis Administrator so access privileges can be assigned. Following that, the
bridge may be checked out. The designer will have three
options here. A structure definition may be created from
scratch, copied from an existing structure or copied from
a template structure. Copied structures always carry along
the library items from the original structure. The first
item in the tree will be your Bridge
Description Information. The structure definition must
be named in accordance with the Bridge Office Superstructure Definition Naming conventions. The last
thing the designer will do is select "Bridge Completely
Designed". If you want to save this structure for fast
bridge creation in the future select the Template box. When
the Template box is checked the structure will be excluded
from batch ratings. Any designs or studies that do not have
a County/Serial identification should have the Template
- Shortly before office check the design squad leader will
provide Bridge Management with a complete set of bridge plans
plus a title sheet. Bridge Management will compare the
plans to the input data and perform a brief superstructure
review followed by a rating review. A report for this
review will be sent to the squad leader.
- After letting Bridge Special Assignments notifies the Administrator so the
bridge can be placed in the "Let/Under Construction"
folder. The designer will retain access privileges during the
construction phase. If any changes to the original design occurred
during construction an additional superstructure definition must be
created and named in accordance with the Bridge Office Superstructure Definition Naming conventions. Bridge Management
will be notified and plans will be provided by the squad leader. The
new As-Built structure definition will be marked as current so batch ratings
will include the correct structure.
- After the bridge is constructed and accepted Bridge Management will enter
the Year Built and place the bridge in the State System folder. At this
time all access privileges will be removed.
a Virtis Opis Troublelog
- Indicate the BID number (far left
column in Explorer Window)
- Written problem description
- Supporting documentation
of an output file
Screen shot (bmp or
- Send troublelog to the Virtis Opis Administrator
The "All Bridges" folder contains all the bridges
in the database. When you drag or copy a bridge to your folder,
all you have is a shortcut pointing to the All Bridges folder.
When you create a new bridge in your folder, you created a
shortcut which points to the All Bridges folder where the
bridge actually lives. There can be more than one shortcut
to the same bridge.
BID's must be placed in this list, no
||BID's are placed in folders automatically
by the filtering/sorting criteria
|Folder with Head:
|| Denotes a personal folder that only the
owner can delete or add too
- All bridges in the database
|| - Tutorial Example Bridges
|PE Design Phase
|| - Any study or design
||- Saved templates for fast bridge creation
|| - Each designer has a personal folder
||- Any bridge that has been let or is currently
|To Be Load Rated
|| - "As-Built", load rated and
ready to be placed in the State System Folder
|On State System
||- NBI inspected, Load Rated "As-Built"
bridge and currently under traffic
User's Manual and Help
- Reviewing the User's
Manual will be helpful.
- There is a help file called "Getting Started"
it will explain general navigation and terminology.
- Press F1 in any screen to bring up help pertinent to
the active window. Use F1 every time you open a new window
until you are comfortable with the program.
- You will also find engine related help that will define
optional and required data. The engine will have to be selected
from the pull down menu, Help/Engine Help Configuration.
- Always start at the top and work down
- don't jump around.
- Navigate with tab and shift tab key instead of the mouse.
- Save Often
- Read the messages on the Validation Window.
- Warnings are NOT errors, may be just data that BRASS
will either calculate or provide a default for.
Copy an existing Bridge to use
as a template
- In the "All Bridges" folder, highlight the
bridge you want.
- Edit - Copy then Edit - Paste (you can rename at this
time or wait till later).
- Select your new "Copy of" bridge and Edit -
Copy then highlight your own folder (destination) Edit -
Paste or drag and drop.
- When you copy an existing structure or create a new one,
you become the owner and may check this bridge in/out at
will. Once the structure is constructed and accepted you
will no longer have permission to change any of this structures
data. Check out privileges may only be obtained from the
- After filling in data from the Bridge Descriptions thru
the Factors in the Bridge Workspace, highlight "Structure
Definition" and select Wizard from the Tools pull-down
menu or select the New Design Wizard button from the tool
bar. Follow the prompts.
- There is also a PS Design Tool (Wizard) button available
when a Member Alternative is selected.
- Know the difference between a Girder System and a Girder
Line. (Girder Lines require you to calculate distribution
factors and dead loads). Know the difference between Schedule
Based and Cross Section Based.
- Some input items can be ignored and populated with default
values from the analysis engine. Read your engine help to
find out which items have defaults. Be sure you know what
that default is before you use it!
Shear Studs, Diaphragms and Stiffener Ranges
- There is a Ranges Example available from the help within Virtis or Opis.
This will fully explain the proper way to enter the selected item.
Remember, you never get a (stud, diaphragm or stiffener) at the start but
you always get one at the end of a range.
- Studs – Enter your ranges continuously from left to right letting
Opis compute the next start distance. This will avoid input problems over the piers.
- Be careful not to double up on the dead load from the deck SFO. Deck and overlay information is found in
- Load Case Description – SFO, Stage 2, D,DC
- Structural Typical Section - Deck Cont'd Tab = Total Deck Thickness
- Wearing Surface Tab of the Structure Typical Section – for FWS Only (DW)
- Member Loads – SFO, for each member over all spans in Kip/ft
- Deck Profile - Concrete Tab = Structural Thickness for Properties
|Examples with and
|(Reference both your top and bottom rebar from the bottom of the slab)
210 mm Deck No Overlay, 25 mm Sacrificial Wear
220 mm Deck with 40 mm SFO, 15 mm Sacrificial Wear
Total Thickness = 210 mm
Structural Thickness = 210 - 25 = 185 mm
Total Thickness = 220 - 40 = 180 mm (DC1, Stage 1)
Wearing Surface = 40 mm SFO (DC2, Stage 2)
Structural Thickness = 220 - 15 = 205 mm
8" Deck No Overlay, 1" Sacrificial Wear
8 1/2" Deck with 1 1/2" SFO, 1/2" Sacrificial Wear
Total Thickness = 8”
Structural Thickness = 8" - 1" = 7"
Total Thickness = 8 1/2" - 1 1/2" = 7" (DC1, Stage 1)
Wearing Surface = 1 1/2" SFO (DC2, Stage 2)
Structural Thickness = 8 1/2" - 1/2" = 8"
Examples with and without overlays
8” Deck, 1” Sacrificial Wear
Total Thickness = 8”
Structural Thickness = 8”- 1” = 7”
8½” Deck with, ½” Sacrificial Wear
Total Thickness = 8½” – 1 ½” = 7”
Structural Thickness = 8½” – ½” = 8”
SFO not entered on the Wearing Surface Tab
Load Case Description – Enter a load case for SFO, Stage 2, D,DC
Member Loads - 1½” SFO for each member over all spans in Kip/Ft
8½” One Course Deck, ½” Sacrificial Wear
With or without a Polymer Overlay
Total Thickness = 8½”
Structural Thickness = 8½” – ½” = 8”
Add a 15 psf FWS on the Wearing Surface tab
Polymer Deck Protection load is ignored
Read the Help Index item called "DEAD LOADS".
It contains a table summarizing which dead load components
are computed automatically by the engine (BRASS) and which
must be entered by the user. Also see page 3-6 of your AASHTO
Spec. for Load Designations. Keep this list handy.
Review the help topic for "Prestressed Member Modeling
Methods" and our help
PS Strand Extensions in Opis
You can enter PS strand extensions in Opis as continuity steel
by the following process. In the Opis library of materials
under Agency Reinforcing Steel there is a material called
Continuity Steel. This pseudo continuity steel MUST appear
after your grade 60 steel in your materials list. Then on
the Continuity Diaphragm tab of the Span Details window you
can enter the material from the library called "Continuity
Steel". This mild steel material is to be used in place
of extended PS strands. You as the designer must come up with
correct combination of number of bars and bar size equivalency.
NOTE: the BRASS analysis engine will only use one yield strength,
so in this case BRASS will convert the continuity steel you
entered into an equivalent number of grade 60 bars.
Whenever you have the "Copy From Library" button
displayed, please check it out for Agency Defined items.
KDOT Agency Library: Request
the VirtisOpis - KDOT Agency Library
Use the Engine tab in the Analysis Settings window to specify
which strength and service limit state checks are appropriate.
Refer to AASHTO 3.4.1
Manual & Tutorial Examples
- A shortcut to the User's
Manual was placed on your desktop during program installation.
- From the Windows Start Button you can navigate to the
AASHTOWare Group and find both live tutorials and PDF tutorial
DESCRIPTION & TRAFFIC INFORMATION
|Descriptive Name - from the
Title Block of the plans
||SB US-77 over Nasty Cr.
|Activities enabled to charge
|Description as shown on the
- Location: (Location from Bridge Display Sheet)
(Max. of 25 characters)
|0.55 MI S US-50
Carried (7)*: (Max. of 18 characters)
Intersected (6)*: (Feature Crossed, From Bridge
(Max. of 24 characters)
Number: (Route, from Bridge Display Sheet)
(Max. of 5 characters)
Post: (County Mile Post, from Bridge Display
(Max. of 9 characters)
Special treatment is required here. At the top of
the window toggle the units to US Customary, enter
the county mile post, then toggle back to SI/Metric.
Association: Select the BridgeWare Association
button, if this is a new LRFD structure check the
Virtis and Opis box's. If this is an existing NOT
designed with the LRFD Spec. then select the Virtis
|On the Description
(cont'd) Tab, all items are selected from a pulldown pick
|State HWY Agency
||State HWY Agency
|Rural Princ. Arterial
|* See item number (2,6,7,8,22)
in the Federal Highway Administration's Recording and
Coding Guide for the Structure Inventory and Appraisal
of the Nation's Bridges (December 1988 and December 1995
|On the Traffic Tab, use the help
(F1 then Bridge Description: Traffic)
Maintenance Projects use
Major Modifications use projected AADT
The traffic data fields are not being filled out correctly by most users. This traffic data provides the values to calculate fatigue. If they are left blank the design ADTT will default to AASHTO's maximum of 20,000.
Below you will find a worked out example.
Typical traffic data found on the Title Sheet of the plans: (this is what you have to work with)
AADT (2005) 4700 Annual Average Daily Truck Traffic (current)
AADT (2026) 6000 Annual Average Daily Truck Traffic (future)
DHV 10% Design Hourly Volume
D 55/45% Directional Traffic - traffic proceeding in one direction only
Screen shot of the Traffic Tab of your bridge description window with the above values entered:
Explanations from the Help within Virtis/Opis:
Enter the truck percentage value used to compute the ADTT. This value comes from Pontis if the bridge is associated with Pontis.
Enter the average daily traffic on the bridge. This value comes from Pontis if the bridge is associated with Pontis.
Enter the percentage value used to compute the traffic in one direction on the bridge.
Enter a recent value for the average daily truck traffic (ADTT) in one direction on the bridge. Virtis/Opis computes this value as the Truck PCT * ADT * Directional PCT.
Enter the design average daily truck traffic (ADTT) in one direction on the bridge.
This value must be computed by the engineer
The Structure Definition Name is to follow a predetermined
naming convention. A typical bridge should only have 3 structure
definitions. They are as follows:
Design Check GMC, Let Oct. 2002.
As Built Nov. 2003 KFH, As Rated Jan. 2004 NLW.
The Design Structure Definition may contain several options
or trials. For this reason the Design Check Structure Definition
which only contains the one design will be used for Letting,
As Build and As Rated.
(Click this button for a printable .pdf of this page.)
Questions and comments regarding this
page or VirtisOpis can be sent to: Dean
Changes to this page are noted in yellow.
This page last updated:
October 10, 2008