Peak Harmonic SRSS Combination for Resonant Response

RAM Concept ’s Peak Harmonic SRSS Combination analysis is based upon a method in the Concrete Centre’s design guide for vibrations[Willford, M.R. and Young, P., "A Design Guide for Footfall Induced Vibration of Structures", Concrete Centre, 2006]. This method predicts the total buildup that is possible under harmonic loading under a limited number of cycles. It is performed for each harmonic individually, and finds the peak acceleration, but provides no information about the phase of the different harmonic results. The results from the different harmonics are combined using a square root of sum of squares (SRSS) technique.

This method is designated the default analysis method in RAM Concept due to its fast computation time and relative accuracy of results.

Note: Because this method only calculates accelerations and response factors, velocity envelope results will not include a contribution from the resonant response analysis. If impulsive response calculations are performed, the velocity envelopes will only include the results from the impulsive analysis, which can be misleading. If velocity performance criteria are being used with resonant response analysis, the Complete Harmonic Superposition should be used instead.