2016 BrDR User Requested Enhancements - AASHTOWare Bridge Design … BrDR Use… · ·...
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Transcript of 2016 BrDR User Requested Enhancements - AASHTOWare Bridge Design … BrDR Use… · ·...
AASHTOWare BrDR 6.8
Feature Tutorial 2016 BrDR User Requested Enhancements
2016 BrDR User Requested Enhancements
Last Modified: 8/9/2016 1
Topics Covered
Reinforced concrete box culvert enhancements
o Culvert Wizard for creating Culverts, Culvert Structure Alternatives and assign Culvert Definitions to
alternatives
o Culvert - Ability to specify LRFD 6th Edition 2013 Interim for LRFD design review and LRFR analysis
o Culvert - Ability to specify limit states for LRFD design review
o Culvert - Ability to process only applicable limit states based on vehicle categories
o Culvert - Ability to specify whether to consider haunch stiffness in the culvert FE model
Specify design vehicles in the Shear Stud Design Tool and Shear Stirrup Design Tool
Enforce unique name for the Bridge Workspace items in a folder
Remove Uniform Load Contraflexure Points Dead Load Case from the Analysis Results window
Concrete member point of interest Concrete member point of interest control options changes
Effective supports for concrete member alternatives
Construction joint for RC tee beams
Multi-cell box web schematic
Output control to not write LRFD/LRFR concrete articles
LRFD live load distribution factor LRFD live load distribution factor range of applicability
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Culvert Wizard for creating Culverts, Culvert Structure Alternatives and
assign Culvert Definitions to alternatives
The Culvert Wizard can be accessed through the Bridge Alternative window in the Bridge Workspace tree.
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Culvert wizard is shown below with three culverts. “Culvert Name” and “Culvert Alternative Name” can be
generated by setting “Culvert prefix” -> clicking on “Generate Culvert Names” button and “Culvert Structure
Alternative prefix” -> clicking on “Generate Culvert Structure Alternative Names” button respectively. Culvert start
distance on the reference line should be entered as “Distance”. “Culvert Definition” can be assigned to each culvert
by using the dropdown listing all the Culvert Definitions defined. Click “Finish” to generate the Culverts and their
Culvert Structure Alternatives.
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The culverts are created with the distance on reference line and the Culvert Definition assigned to Culvert Structure
Alternative as defined in the wizard above.
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Culvert - Ability to specify LRFD 6th Edition 2013 Interim for LRFD design
review and LRFR analysis
LRFD 6th Edition 2013 Interim (LRFD 6th 2013i) can be selected as a “Spec Version” for both AASHTO Culvert
LRFD and LRFR Engines.
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Culvert - Ability to specify limit states for LRFD design review
Culvert can be design reviewed with LRFD based on the limit states selected for “Reinforced Concrete” in the
Factor - LRFD window as shown below.
The screen shot below shows the above LRFD factor being assigned to “Culvert Alt 1”.
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A comparison of LRFD specification checking with design vehicle HL-93 between 6.7.1 and 6.8 is presented below
to highlight the implementation of limit states based on selections above. Strength-II is skipped since there is no
permit vehicle defined. Fatigue-I and Fatigue-II are skipped since reinforced concrete is not evaluated for fatigue.
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Culvert - Ability to process only applicable limit states based on vehicle
categories
Design review of culvert with LRFD considers vehicle category when deciding on applicable limit states. With the
limit states selected as shown above for “Ability to specify limit states for LRFD design review” topic and only
permit vehicle defined, BrDR will only consider Strength-II limit state as shown below.
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Culvert - Ability to specify whether to consider haunch stiffness in the culvert
FE model
This enhancement to the AASHTO Culvert Engine allows user to specify whether to include haunch stiffness in the
culvert FE model for LRFD design review, LRFR and LFD rating.
The haunch stiffness will be included to both the slab component and the wall component FE models. The midpoint
section properties will be used for the FE beam elements within the haunch location. Below figure illustrates the
contribution of the haunches to Top Slab 1.
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Use the Culvert model example in the database “Culvert Example 1” to check the implementation of this feature.
Open RC Box Culvert Geometry window and add haunches as shown below.
The comparison below shows the changes in the depth, area and moment of inertia (I) of the Ext. Wall 1 between
Control option: “Include haunch stiffness in FE model” unchecked and Control option: “Include haunch stiffness in
FE model” checked (as shown above).
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Specify design vehicles in the Shear Stud Design Tool and Shear Stirrup
Design Tool
Specify design vehicles in the Shear Stud Design Tool
Open the Bridge Workspace for BID 1, TrainingBridge1 as shown below.
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Open the Analysis Settings window and enter a design template as shown below.
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Click on the Save Template button to save the design template. Enter a name for the template and click on Save to
save the template.
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Click on the to expand the tree for SUPERSTRUCTURE DEFINITIONS, MEMBERS, and MEMBER
ALTERNATIVES. The partially expanded Bridge Workspace tree is shown below.
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Open Deck Profile window and browse to Shear Connectors tab.
Click on the Shear Stud Design Tool button to open the design tool window.
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Click on the drop down list to choose a design template. The previously defined template “HS 20-44 Design
Review” is shown in the list.
Click on View… button to view vehicles in the template.
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Click on Continue button to run an analysis for shear studs. When the analysis is complete, the design result will be
shown as follows.
Click on Apply button to apply the design result.
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Click on View Calcs button to view the design results.
The result shows the vehicles used for the design.
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Specify design vehicles in the Shear Stirrup Design Tool
Open the Bridge Workspace for BID 10 as shown below.
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Click on the to expand the tree for SUPERSTRUCTURE DEFINITIONS, MEMBERS, and MEMBER
ALTERNATIVES. The partially expanded Bridge Workspace tree is shown below.
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Open the Shear Reinforcement Ranges window.
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Click on Stirrup Design Tool button to open the design tool window.
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Click on the drop down list to choose a design template. The previously defined template “HS 20-44 Design
Review” is shown in the list.
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Click on View… button to view vehicles in the template.
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Click on Continue button to run an analysis for shear stirrup. When the analysis is complete, the design result will be
shown as follows.
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Click on Create Ranges to create ranges for the stirrups.
Click on Apply button and the range of stirrups is applied.
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Click on View Calcs button to view the design results. The result shows the vehicles used for the design.
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Enforce unique name for the Bridge Workspace items in a folder
BrDR does not allow to save items with the same name. Below is an example.
Open the Bridge Workspace for BID 1 as shown below. The bridge has a concrete material called “4500 psi
Concrete”.
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Add a new concrete material by double clicking on Materials, Concrete in the tree. Name the concrete material as
“4500 psi Concrete” which is the same name as the existing concrete material.
Click OK button to save the material. An error message shows up saying “Concrete material names must be
unique!”.
BrDR ignores upper case and lower case. Therefore, “4500 psi concrete” and “4500 PSI CONCRETE” are treated as
the same.
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Remove Uniform Load Contraflexure Points Dead Load Case from the
Analysis Results window
BrDR computes the contraflexure points by applying an uniform dead load along the bridge span. The results of the
Uniform Load Contraflexure Points Dead Load Case used to be shown in the tabular results for BrDR versions
before 6.8.0.
In BrDR 6.7.1, open the Bridge Workspace for BID 2 as shown below.
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Click the Analyze button on the toolbar to perform the rating.
When the rating is finished, you can review the results due to dead load by clicking the View Analysis Report on the
toolbar. The window shown below will open. You can choose Uniform Load Contraflexure Points in the drop down
list for Dead Load Case.
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In BrDR 6.8.0, open the Bridge Workspace for BID 2. Click the Analyze button on the toolbar to perform the
rating. When the rating is finished, you can review the results due to dead load by clicking the View Analysis Report
on the toolbar. The window shown below will open. The results for Uniform Load Contraflexure Points Dead Load
Case is no longer shown in the drop down list.
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Concrete member point of interest control options changes
In BrDR version 6.7.1, there are multiple changes to the control options for Point of Interest of concrete member
alternatives, including
Adding “Generate at support points”,
Revising “Generate at tenth points” to “Generate at tenth points except supports”, and
Adding “Generate at support face & critical shear position”.
In BrDR version 6.7.0, open the Bridge Workspace for BID 11 as shown below.
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Double click on the member alternative “Schedule Based Tee”, and switch to Control Options tab. Three control
options for Points of Interest are shown below.
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In BrDR version 6.8.0, open the Bridge Workspace for BID 11. Double click on the member alternative “Schedule
Based Tee”, and go to Control Options tab. Five control options for Points of interest are shown below.
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Effective supports for concrete member alternatives
In BrDR version 6.7.1, users can define the effective supports for all reinforced concrete and prestressed concrete
member alternatives.
Open the Bridge Workspace for BID 11 as shown below.
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Double click on the “Effective Supports” and the Effective Supports window shows up as below.
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Click F1 to open the Help file. Description of the window and rules for generating Points of Interest are shown.
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Construction joint for RC tee beams
This enhancement enables users to define a longitudinal construction joint in a RC tee beam. The joint is accounted
for in the calculation of reinforcement steel development lengths as stated in the notes below.
Notes:
Construction joint location from top of top flange will be added to the T-beam Cross Section window and T-
beam Girder Profile-Section tab.
This data will be used to determine if the bar is a top bar in the reinforcement development length calculations.
The construction joint location is used to determine if the development length factor for more than 12" fresh
concrete below the bar is to be considered. If the construction joint location is not entered, the development length
factor will consider the total depth of the section below the bar.
To define the construction joint location, open the Bridge Workspace for BID 11, RCTrainingBridge1 as follows.
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Expand the “Structure Definition #1” as follows.
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Double click on “Cross Section A” to open the Cross Sections window.
For cross-section based RC Tee beam, development length of longitudinal rebars are not calculated. Adding the
construction joint does not change the analysis results.
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Expand the “Schedule Based RC Structure” as follows.
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Open Girder Profile window and the construction joint location can be defined.
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Multi-cell box web schematic
In BrDR version 6.7.1, users are allowed to view the schematics for webs of concrete multi-cell box superstructures.
Open the Bridge Workspace for BID 27 MultiCell Box Examples as follows. Click on WEB1 for RC MCB Example
to highlight it.
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Click on View Schematic button.
The schematic of WEB1 is shown as follows.
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Output control to not write LRFD/LRFR concrete articles
In BrDR version 6.7.1, users can choose to not generate the detailed LRFD/LRFR specification articles in the
Specification Check window. This feature only affects all concrete articles. Below is an example showing how to
use the feature.
Open the Bridge Workspace for BID 10, Example7 as follows.
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To specify the specification output, open the View analysis setting window by clicking the button shown below.
The Analysis Settings window shows up.
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Switch to Output tab. The control option “LRFD/LRFR Conc Article Detailed” is shown as follows. It is checked by
default.
Click the Analyze button on the toolbar to perform the rating.
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After the rating analysis is done, click on View Spec Check button to view the specification articles.
The detailed specification articles can be reviewed by double clicking on the specification articles.
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Go back to Analysis Setting window, Output tab. Uncheck the “LRFD/LRFR Conc Article Detailed” checkbox.
Click the Analyze button on the toolbar to perform the rating.
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After the rating analysis is done, click on View Spec Check button to view the specification articles. The Spec
Check Viewer only shows Pass/Fail for the articles but restricts opening of the articles.
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LRFD live load distribution factor range of applicability
In BrDR version 6.7.1, users are allowed to specify ranges of applicability for LRFD live load distribution factor
calculations.
To view the range of applicability, open the Library Explorer.
Expand the LRFD DF Applicability Ranges folder, then click on Standard. The two default ranges are listed.
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Double click on “2014 (2016 Interim) AASHTO LRFD Ranges” to open the window.
This window has six tabs which contain ranges of applicability defined in the following tables in the 2014 AASHTO
LRFD Bridge Design Specifications with 2016 Interim.
Table 4.6.2.2.2b-1: Distribution of Live Loads for Moment in Interior Beams
Table 4.6.2.2.2d-1: Distribution of Live Loads for Moment in Exterior Longitudinal Beams
Table 4.6.2.2.2e-1: Reduction of Load Distribution Factors for Moment in Longitudinal Beams on Skewed
Supports
Table 4.6.2.2.3a-1: Distribution of Live Load for Shear in Interior Beams
Table 4.6.2.2.3b-1: Distribution of Live Load for Shear in Exterior Beams
Table 4.6.2.2.3c-1: Correction Factors for Load Distribution Factors for Support Shear of the Obtuse Corner
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Click F1 to open the Help file. Description of the window and the override rules are shown.
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To specify user defined ranges of applicability, switch to Agency folder under LRFD DF Applicability Ranges
folder, and select File/New from the menu. The following window will show up.
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Define the ranges and the override rules. Then click Save to save the data and close the window.
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Open the Configuration Browser by clicking , then double click on System Defaults.
Switch to Superstructure Analysis tab and choose the previously defined ranges of applicability in the LRFD DF
Applicability Ranges dropdown list.
Click Save to save the data and close the window. The user defined ranges of applicability will be used for
calculating LRFD live load distribution factors.