Question:

How Joint Flexibility works in SACS if it is used in the OPTION card?

Answer:

For details on Joint flexibility implementation, see the following sections in Collapse Advanced manual:

1. Fessler (Section 6.10.3)
2. Buitrago (Section 6.10.4)
3. MSL (Section 6.11)

There are several verification examples in the manual. Refer to Section 5.1.14 Sample 14: Collapse Analysis of 2D Frame with Tubular Braces, 5.3 Joints, etc in the manual. You can also access all the SACS model verification files in Sample 24 from the Executive or your installation directory.