Denis Gomes

Use penalty approach and multi-point constraints to implement supports offset from the global orthogonal coordinate directions.

Implement a way to account for tee flexibility factor. Typically this factor is 1 for different codes. The DOFs associated with the tee (in bending would have to be modified),...

Use the Newmark method or some other time dependent approach to solve time history analyses.

Use the modal analysis results to compose a response spectrum analysis by summing the contributions from different modes.

Implement modal analysis to determine system frequencies due to different types of vibrations.