What to do when dynamic Response Spectrum exceeds a code allowable when using AutoPIPE?
The response can usually be changed by increasing or decreasing the frequency of the mode shape causing the dynamic response. Using the animation of the dynamic response spectrum analysis, and find the mode shape which closely matches this response. The solution is usually adding a restraint at a point of large modal displacement which typically increases the modal frequency.
Since the dynamic load factor (DLF) drops with increasing frequency, the best solution is to increase the 1st modal frequency. This is done by increasing the stiffness of the system e.g. adding supports or increasing support stiffness or reducing its mass e.g. thinner pipe or move valves closer to support locations.
"Code Compliance" sub-report
Bentley AutoPIPE