GH Structural Models
Constructing structural models in Grasshopper • Last modified on 9/17/2019 • edit

This tutorial assumes you are comfortable with creating, modifying, and converting Speckle objects in Grasshopper. To learn more, please read the the following tutorial.

It is possible to construct a full structural model in Grasshopper using the Speckle plugin. The level of fidelity of the model can be up to the user; you can send simple meshes and lines all the way to full models with section properties, loads, and analysis tasks. For this guide, we will be assuming that the model will be sent to the design layer of GSA. In addition, we will be using the SpeckleElement object model. To start, create the geometry of the model using lines for 1D members and meshes for 2D members. Sending this to GSA will transfer the members.

ghToGsaBasic

Using the Grasshopper components, we will assign section properties to our members. This can be done by explicitly converting our line and mesh to Structural1DElement and Structural2DElementMesh respectively and attaching some properties to it using the modify component. Structural2DProperty and Structural1DProperty objects will also be created using the schema builder.

Properties which includes Ref at the end of its name expects the application ID of the Speckle object it is referring to. For example, our Structural2DElementMesh expects the application ID of a Structural2DProperty for its PropertyRef input. If the ApplicationID input is not exposed for the Structural2DProperty, use the overwrite custom properties menu in the context menu to expose it.

ghToGsaProperties

Using this pattern, it is possible to create a full fidelity model from Grasshopper for use in GSA (and other structural programs). A demo Grasshopper file can be downloaded here. This model includes everything required to run the analysis: section properties, material properties, loading, analysis tasks, etc. Make sure to set your Rhino units to Millimeters before opening the file and sending the model.

ghToGsaFull