2016 BrDR User Requested Enhancements - AASHTOWare Bridge Design … BrDR Use… · · 2016-08-30Culvert can be design reviewed with LRFD based on the limit states selected for

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



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.



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.



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.



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.



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”.



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.



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.



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.



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).



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.



Open the Analysis Settings window and enter a design template as shown below.



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.



Click on the to expand the tree for SUPERSTRUCTURE DEFINITIONS, MEMBERS, and MEMBER

ALTERNATIVES. The partially expanded Bridge Workspace tree is shown below.



Open Deck Profile window and browse to Shear Connectors tab.

Click on the Shear Stud Design Tool button to open the design tool window.



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.



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.



Click on View Calcs button to view the design results.

The result shows the vehicles used for the design.



Specify design vehicles in the Shear Stirrup Design Tool

Open the Bridge Workspace for BID 10 as shown below.



Click on the to expand the tree for SUPERSTRUCTURE DEFINITIONS, MEMBERS, and MEMBER

ALTERNATIVES. The partially expanded Bridge Workspace tree is shown below.



Open the Shear Reinforcement Ranges window.



Click on Stirrup Design Tool button to open the design tool window.



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.



Click on Continue button to run an analysis for shear stirrup. When the analysis is complete, the design result will be

shown as follows.



Click on Create Ranges to create ranges for the stirrups.

Click on Apply button and the range of stirrups is applied.



Click on View Calcs button to view the design results. The result shows the vehicles used for the design.



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”.



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.



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.



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.



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.



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.



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.



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.



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.



Double click on the “Effective Supports” and the Effective Supports window shows up as below.



Click F1 to open the Help file. Description of the window and rules for generating Points of Interest are shown.



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.



Expand the “Structure Definition #1” as follows.



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.



Expand the “Schedule Based RC Structure” as follows.



Open Girder Profile window and the construction joint location can be defined.



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.



Click on View Schematic button.

The schematic of WEB1 is shown as follows.



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.



To specify the specification output, open the View analysis setting window by clicking the button shown below.

The Analysis Settings window shows up.



Switch to Output tab. The control option “LRFD/LRFR Conc Article Detailed” is shown as follows. It is checked by

default.




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.



Go back to Analysis Setting window, Output tab. Uncheck the “LRFD/LRFR Conc Article Detailed” checkbox.




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.



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.



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



Click F1 to open the Help file. Description of the window and the override rules are shown.



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.



Define the ranges and the override rules. Then click Save to save the data and close the window.



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.

Documents

2016 BrDR User Requested Enhancements - AASHTOWare Bridge Design … BrDR Use… · · 2016-08-30Culvert can be design reviewed with LRFD based on the limit states selected for