An Overview of Structural Analysis for Revit

A few years back I reviewed the Load Takedown add on for Revit. This has now been replaced with ‘Structural Analysis for Revit’ which many of you will now have included with the new Autodesk AEC Collections. So what can you do with this tool and how do you use it?

Structural Analysis for Revit Results

Let’s start with what it can do and where I would see this tool fitting into the process.

Here is a video Tutorial for the whole process.

Firstly, this service uses the cloud to analyse your structure and as such, you will need to have some cloud credits to spend on this. In my experience, many companies have hundreds of unused credits so this should not be a huge problem.

The Robot engine is used to take your analytical model from Revit, along with loads and load combinations and then present results back either in the format of a report, a web page or directly within the Revit environment.

I would see this being used as a preliminary tool to try a few ‘what if’ examples prior to in depth analysis.

Where to Start

Download the Structural Analysis Toolkit 2018 from here:

https://apps.autodesk.com/RVT/en/Detail/Index?id=4901636995211349921&appLang=en&os=Win64

Your Analyze Ribbon within Revit will now have the following tools displayed.

Structural Analysis for Revit Ribbon

The Analytical Model

Your Analytical model must be accurate and have connectivity between all nodes otherwise the analysis will fail (this will not use any cloud credits).

Analytical Model from Revit

It is a good idea to check the model in Revit prior to starting the cloud based analysis. Use the Filters tool in Visibility Graphics to check for unconnected nodes. Tutorial for this is here: http://youtu.be/J2_iddaJzLg

Revit Filters for Unconnected Nodes

Check that your beam and columns have the correct release conditions as this will obviously affect the outcome of any analysis and cause instability in some cases.

Create the required Load Combinations

Revit Load Combinations

Starting the Analysis

Select the Analyse in Cloud tool.

Analyze in Cloud icon

A number of checks will be performed and you will then see the dialog box below. Here you can set the type of Analysis (Gravity or Static). In this example we will create a load take down so set the analysis to Gravity and click start.

Structural Analysis for Revit - Configuration of Analysis

Once the analysis is complete you can view the results in a simple report, in Revit or review the model and various results live in the web page.

Structural Analysis for Revit - Dashboard

Here are the results displayed live in the webpage.

Structural Analysis for Revit Reactions on Webpage

Hope this was useful,

LawrenceH

Revit Structure – Using Load Take Down for Internal Dead Loads

Here is a very quick tip and trick for modelling dead loads from internal walls to your analysis programs. You will first need to ensure that you have the Load Take down tool added to Revit which can be download from Autodesk Exchange Apps

https://apps.exchange.autodesk.com/en

Once this is installed you will need to add your internal walls and make sure that these are structural and have an analytical model. In the image below I have created a filter to show these in Red.

Revit Analytical Model with Filters for Internal Walls

You also need to add Boundary conditions for the slabs, walls and columns and set the fixity for these. You can then start the Load Take down tool from the Extensions Ribbon.

Revit Load Takedown - Linear Loads

Click the Structural Analysis command and then you can see the linear loads on either the entire structure or just the stories where the loads are applied. These linear loads can then be added to the Revit model (A manual process at the moment).

Line Loads added to Revit

The model can then be transferred to your Analysis application.

Enjoy,

LawrenceH

Load Takedown

Within the Robot Structural Analysis extensions is a very useful tool called Load Takedown. This module allows you to perform a simulation to determine the vertical forces or stress within your Revit Structure model. To obtain the correct results it is important to make sure you have a valid analytical model. You can use the tools on the Analytical tab to make sure you have connectivity within the analysis model or verify the structure within the Load Take down tool. The module is then able to pass the results back into Revit Structure so you can tag the loading on the foundations.

Start the Load Take down command from the Add-Ins ribbon as shown below.

The Load Takedown tool will then ask you to specify the load case that includes the self weight of the structure. You will then see the dialog box below. The first thing to do is verify the structure.

Next you are given the opportunity to model in supports. The supports are taken from Revit Structure but you can add or remove additional supports from this dialog box and control if the support is pinned or fixed.

On the Loads tab you can review and check the loading added to the Revit Structure model.

Next you are able to choose the load case, in this example DL1, and then click the Calculate command. I have also selected just the first floor to be displayed. You are then able to see the tributary areas. With the check boxes in the lower window you are able to review other information such as the axial forces shown below.

I have then been able to pass the foundation loading back to Revit Structure and tag the results as shown below. These are added as Internal Point Loads.

I hope you find this useful,

 

LawrenceH