This tutorial describes how to model a pin connection between crossing members. Instruction will consider the structural system shown in Figure 1. The critical joint within this system is located as point E. To induce structural response, a 100kN load will be applied, in the gravity direction, at the end of the horizontal element.
Figure 1 - System with crossing member
To begin, use SAP2000 to create the model shown in Figure 2:
Figure 2 - SAP2000 model
This model may be generated through the following process:
Select joint 4, the point of pin connection, then use the Edit > Edit Points > Disconnect command to create four separate joints at this location, one for each of the coincident members. The new joints will be numbered 4, 7, 8, and 9, as shown in Figure 3:
Figure 3 - Revised joints at the pin-connection
Use the LOAD load pattern to assign a 100kN load, in the gravity direction, at joint 6. The resultant configuration is shown in Figure 4:
Figure 4 - Load application
As a validation of successful modeling, analysis will then generate the moment diagram shown in Figure 5:
Figure 5 - Flexural response
Lamom, A., Thepchatri, T., Rivepiboon, W. (2012). Hybrid connection simulation using dynamic nodal numbering algorithm. American Journal of Applied Sciences, 7(8), 1174-1181.