Today I'm going to cover how to manage and create the analytical model in Revit
Every structural element has an associated analytical model which can be displayed on each view under the analytical model categories
The analytical model is linked to a physical model which means that it inherits
some properties like the section, the material and the general geometry
For structural element, the analytical model can be enabled or disabled depending on the structural behavior you want to achieve.
Once it is activated , you can access to its properties, for instance
the “Analyse as” property determines if the column contributes to lateral analysis
Some properties are greyed out as they inherit directly from the associated physical model
The section and so the inertia and the material properties are read directly from the physical asset applied to the material
Under this asset, you can control : the behavior, the basic thermal property, the mechanical property and the material resistance
The geometry of the analytical model can be adjusted independently from the physical model
Analytical alignment encompasses different option to place the analytical model
Three methods of analytical alignment are available :
If auto-detection is seleted Revit adjust automatically the analytical model based on tolerance settings
If projection is selected, for each direction, according to the local system of the element,
you have access to available references : plan, level or grids
Element references such as "Center", "Right" or "Left" for the column are also availble
Ends and general model can then be projected to these references
The analytical model elements can also be adjusted manually.
The analytical adjust tool gives you access to analytical nodes
In the case of a linear element like a beam, ends nodes are displayed with their local system axis
Nodes can then be move along these axis or in the local plans.
This can be done in the local coordinate system or in the global coordinate system
You can flip from on system to another by pressing the space bar.
Modify tools such as align or move are also availables and can be used in 2D or 3D views.
For an analytical surface element such a slab you can manipulate each edges an corners in different coordinate systems or views.
By selecting an edge, local or global system are displayed and can be used to adjust it
Corners are analytical nodes and behave like in the previous example.
Once the analytical model has been adjusted, structural load cases can be applied to it
and as any other analytical model category loads can be displayed in any views
You can create point, line or area loads and edit their force and moment magnitude
Each load is related to a load case, into the "Structural Settings",
you can create and specifiy the name, the number and the nature of each load case.
Furthermore, you can also add "Load Combination" for serviceability and ultimate state by combining existing load case.
Finally, you can apply boundary condition to your analytical model
it can be point, linear or area support condition
you just have to click an analytical element to place them
In this example, we are placing punctual support condition to analytical nodes
The state of a support can be set as "Fixed", "Pinned", "Roller" or "User Defined" for any translation or rotation
For "User Defined" type, you can set up a spring modulus coefficient.