Simulation and Analyses

Wind load simulation and automatic generation of wind loads

You can either run the simulation directly in Robot, or you can export your structure to Autodesk Simulation CFD if the program is installed on your machine.

The Wind loads simulation feature allows you to simulate a wind flow around your structure, and to generate wind loads automatically.

This feature is especially useful with structures that have a complicated geometry, and for which it is usually difficult to define the right wind loads. The wind simulation acts as a wind tunnel, and displays colored pressure maps on the model in order to visualize and understand the effects of the wind.

The results of this simulation can be used for further analyses, or to verify a typical approach based on specific codes.

Several wind parameters are available such as the wind direction, wind velocity, and wind pressure. The ground level, and elements exposed to the wind can also be specified.

To run a wind load simulation, click Loads Wind Loads simulation Generate wind loads.

See Generate Wind Loads Automatically.

To perform an advanced fluid analysis with Autodesk Simulation CFD, click Loads Wind Loads simulation Simulation CFD.
Note: Autodesk Simulation CFD must be installed on your machine.

See Export the model to Autodesk Simulation CFD.

Direct Analysis Method - A new approach to stability design

The Direct Analysis Method for steel frame structures is a new AISC approach for the stability design which requires:
  • The addition of notional forces to the load combinations,
  • The reduction of the member stiffness,
  • P-delta local effects for the P-DELTA analysis.

Robot uses the Direct Analysis Method in conjunction with detailed option settings to generate a supplementary model in which all the previously stated modifications are made automatically. In addition to the standard AISC approach, it is also possible to use customized parameters for the DAM model.

It is possible to work simultaneously with the original model and the DAM model by selecting either model at any time. When steel member design is executed from the original model, it uses the results from the appropriate model automatically.

The primary benefit of this approach is the possibility to check the section capacity during the design phase, without using effective lengths or amplified moments.

A DAM analysis can be performed on any 3D model for which ULS combinations have been defined.

To set up a DAM analysis, click Analysis Analysis Types, and then select Direct Analysis Method.

Note: The Direct Analysis Method currently supports the use of the static seismic approach as defined in the following codes; ASCE 7-10, IBC 2012, NBCC 2010, AS 1170-4:2007. Support for the spectral seismic approach is planned for future versions of this feature. Please be aware that usage of non-static load cases will be reported to the user, and will not be accounted for in the creation of load cases for evaluation at this time.

See Run a DAM analysis.

Block Lanczos algorithm for dynamic calculations

The block Lanczos algorithm increases the speed of dynamic calculations compared to the standard Lanczos approach. This algorithm is especially useful for large models.

To access the block Lanczos option, select a modal analysis type, and then click Advanced parameters in the Modal analysis Parameters dialog.

See Modal Analysis Parameters.

Improved bi-directional model data exchange between Autodesk Revit Structure and Robot.

A new Structural Model eXchange (SMX) solution has been implemented to enable a bi-directional exchange between Revit Structure (RST) and Robot (RSA).

The SMX feature addresses several limitations of the former Revit2Robot link, such as the systematic modification of the RST model during the export for example. With the SMX solution, the information collected on the models during previous transfers is saved and reused to allow for a faster round tripping between both programs.

Although the former Revit2Robot link remains functional, the new SMX feature brings significant improvements such as:
  • An improved and faster round tripping experience.
  • Smaller file transfer.
  • Compatibility with Structural Analysis 360 service.

Another advantage of the SMX solution is the possibility to exchange data between Revit Structure and Robot without needing to install both programs on the same machine, or have them run at the same time.