AU09_SpeakerHandout_SE9300-1

8/7/2019 AU09_SpeakerHandout_SE9300-1

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Structural Design Using Autodesk Robot

Structural AnalysisBrian Johnson Autodesk, Inc.

SE9300-1 This extended lecture class will focus on structural design for structural steel andreinforced concrete structures using Robot Structural Analysis. This presentation will provide anoverview of design workflows and structural design criteria using Robot and Revit Structure and in-depth instruction on specific design tasks. You will learn how to optimize structural steel designs, designsteel connections, and perform automatic and interactive concrete reinforcement design. Explore customdesign options with the Robot Spreadsheet Extension. This class will not focus on analysismethodologies, rather it is intended to show the design and optimization functionality in Robot.

About the Speaker:Brian is a Structural Technical Specialist for Autodesk. He is an expert in structural modeling and designusing Revit Structure. Brian is a licensed structural engineer with over ten years of building design andconsulting experience. During that time he worked as a Project Engineer/Manager and Principal on avariety of structures. He earned a B.S. in Civil Engineering from the University of Texas at Austin.

[email protected]


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Structural Design Using Autodesk Robot Structural Analysis

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IntroductionThis course will provide a brief overview of the structural design capabilities of Robot Structural Analysis

Professional. Firstly, we will dive into the processes for designing structural steel framing, steel

connections, and reinforced concrete framing. Then we will tour composite steel design and

interoperability with Revit Structure. Finally, well see how to use the Robot Spreadsheet Extension for

post-processing of Robot model data.

Job PreferencesI recommend customizing your Job Preferences based on the project location and design requirements.

These settings can be saved and reused for future projects. They generally include selecting units,

material and section databases, and design codes. During the installation process Robot localizes your

settings appropriately, so minor tweaking is probably all that is needed.

Robot Structural Analysis has the following databases and design for North America:

AISC 360-05 (13th

Edition)

AISC LRFD 2000 (3rd Edition)

AISC LRFD 1994 (2nd

Edition)

AISC ASD 1989 (9th

Edition)

CSA S16-01 + Supp. No. 1 (2005)

CSA S16.1-94

ACI 318 (recent versions)

CSA A23 (recent versions)


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Structural Steel DesignAfter performing the analysis calculations for a structure, you can verify and optimize the design of

structural steel members. The process is rather simple. Specify the design criteria for members such as

buckling parameters. Then verify member design capacity or optimize the members. Finally, re-run the

analysis calculations and repeat the process until the design is to your satisfaction.

Like members can be placed into

Groups. For example, place floor beams

with similar spans and tributary widths

into groups called, say FB-01, FB-02,

etc. Another example may be to place

truss diagonals into a Diagonals group

and truss verticals into a Verticals

group. Member verification and

optimization are determined usingultimate and/or serviceability limit

states.

Member verification can performed for

individual members and member

groups. For group verification the

design capacity or failure for all the

members in the group is determined by

the worst case. Thus, if one member of

the group fails while the remainder is fine, the group fails the verification check.

Optimization is only performed for member groups. You can indicate optimization criteria such as

minimum/maximum depth to narrow the design choices. Like verification, success or failure of the group

is determined by the worst case.

There are a variety of ways to evaluate the design results. Firstly, Robot presents a table of results which

quickly identifies members that have capacity (green OK) or fail (red X). The design capacity ratio (aka

Unity Check or Interaction Check) is indicated among other relevant results.


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Two graphical

representations of

results are also

available. An analysischart shows the

capacity ratio of each

element allowing you to

quickly see which

elements are

significantly over

capacity or under-

designed relative to

adjacent elements. The

Map showing the wire-

frame structure with

members colored pertheir design ratio is also

quite handy to quickly

spot the location of

failing members.

Finally, you can drill down into the detailed design results for each member and produce a simplified or

rather detailed Calculation Note.


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Steel Connection Design

In additional to structural steel design, you can also design several types of steel connections usingmembers in the structure model. Alternatively, you can design steel connections with no relationship to

model members. Currently, Robot Structural Analysis Professional can only design Steel Connections

using the Eurocode (ENV 1993-1-1:1992 and EN 1993-1-8:2005), the French steel code CM66, and the

Polish steel code PN-90/B-03200. AISC and CISC design codes are not available for Steel Connection

Design at this time.

For model members, first run analysis calculations, then select the appropriate members

typically a column and beam(s), and finally, click the new connection button. Specify the new

connection parameters in the connection definition dialog. Once the connection is defined, run the

connection design calculations and review the Calculation Note to verify adequate capacity or failure of

the connection.


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To design a connection not related to any particular model members simply select the connection type

from the side bar. Define the connection parameters and runthe manual design verification with user-defined loads.

Robot Structural Analysis maintains a list of all connection

designs with in a project for easy access and revision.

Reinforced Concrete DesignRobot Structural Analysis Professional has a robust set of

reinforced concrete design tools. There are two points of

entry for RC design through component design modules

and via a whole-structure approach.

In terms of analysis and design capabilities, Robot Structural

Analysis performs mild steel design in member/bar elements

and panel elements such as slabs and walls. It is not possible

to directly design pre-stressed and post-tension concrete

elements; however, there are methods for equivalent loading.


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RC Member Design

After running analysis calculations for an entire structure, you can quickly design concrete reinforcement

for all or select RC elements based on theoretical required areas of steel. The design criteria are fairly

general allowing definition of typical cover and bar size to use for longitudinal and transverse bars.Different criteria can be established and used for different elements. After running the calculations, you

can review but not edit the results. A similar design review can be performed for panel elements as well.

This design approach, while limited in design criteria, provides a birds eye review of all the RC elements

to help you quickly determine elements that are failing versus those that are grossly over-capacity. As

such you are able to optimize the structure at a global scale.

Additionally, you can select RC elements for a more detailed and interactive design process using the RC

Design modules.

RC Design Modules

The RC design modules are used for design of individual elements within a 3D structure model or asseparate files independent of any 3D structure model. Furthermore, the column, beam, and spread

footing modules are also used directly by the Reinforcement Design Extension in Revit Structure.

The design process is as expected. Define geometry, loads, and design criteria. Run analysis and design

calculations. Evaluate results & modify design as needed. Finally, generate calculation notes and design

documentation. The interface and design criteria will indeed differ between modules; however, the

process is generally the same.


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The RC Column and RC Beam modules have Reinforcement Editing (Edition) views that provide a more

direct graphical way to modify the provided reinforcement. Graphical design results are shown and

automatic design verification is available to instantly see the impact of a modification on elements

capacity. In addition to direct modification of the design this view can also be exported in DWG or DWFformat for use in AutoCAD.

Extensions for Robot Structural Analysis

Reinforcement Design

The Reinforcement Design Robot Extension will

facilitate design of reinforced concrete Beams,

Columns, and Spread Footings from within Revit

Structure. There are two workflows for this Extension.

The first is to design new rebar for the element. The

second is to verify the design of rebar previously


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modeled with a Revit Reinforcement Extension.

The process is to select an element for design, execute the Extension, perform the new design or

verification in Robot Structural Analysis, and finally, update the Revit model. Once executed the

Extension should spawn a new session of Robot Structural Analysis if not already opened.

Note that while this is a bi-directional link between Robot Structural Analysis and Revit Structure, the link

becomes asymmetrical after the first round-trip exchange. Subsequent exchanges for the same element

can only be updated from Robot Structural Analysis provided no layout or cross-section revisions were

made in Revit Structure.

Integration with Robot Structural Analysis

The Integration link between Revit Structure and Robot Structural Analysis facilitates updating the Revitmodel with the latest Robot design information. The link exchanges structural steel and concrete framing

member data and can also transfer reinforcement for beams, columns, and spread footings. The link

allows you to bi-driectionally transfer the entire model or just selected portions of the model.


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Unlike the Reinforcement Design Extension, the Integration Extension transfer Bar and Panel elements

bi-directionally without exception. However, the rebar transfer caveats still apply.

Composite Steel

The Composite Design Robot Extension in Revit Structure performs composite steel design for floor

framing. To utilize the Extension you must first model the Floor and Floor framing (of course), set up Load

Cases (DL & LL), and model loads onto the Floor. Select the framing you want to design and execute the

Extension.

You can run the Extension in Automatic or Interactive mode. I prefer Interactive. The design criteria you

can specify include camber & deflection (pre- & post-composite) parameters, stud properties, slab

properties, and construction loading. After specifying the design criteria, hit Design All. Once the design

calculations run, you can see the levels of capacity and failing members.


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Click on a member to review load & deflection diagrams and detailed design results. Here you can also

override the optimized design using more studs, non-composite behavior, or different section. Hit Accept

Changes after completing your modifications.


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After you are satisfied with the floor design, click Accept Design and the Extension will update your Revit

model to reflect the completed design including member Type, Number of Studs, and Camber.


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Robot Spreadsheet ExtensionThe Robot Spreadsheet Extension is an Excel Add-in that leverages Robot databases and even Robot

analysis models for enhanced spreadsheet design aides. The Extension comes with several pre-built

spreadsheets from parametric model generation to steel connection design. It also has tools to help you

build your own or modify your existing spreadsheets with Robots enhancements.

The primary benefits of using the Spreadsheet Extension are to facilitate creation of custom design aides

and augment Robot Structural Analysis with custom post-processing. Examples include custom steel or

wood connections using framing and load information from a Robot model.

SummaryRobot Structural Analysis provides wide array of structural design functionality for structural steel and

reinforced concrete framing. We have reviewed the processes for designing structural steel, steel

connections, and reinforced concrete elements in Robot Structural Analysis, designing composite steel

framing and interoperating with Robot within Revit Structure, and augmenting Robot with customization

using the Robot Spreadsheet Extension.

AU09_SpeakerHandout_SE9300-1

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