Structure natural period estimation method, structure seismic resistance judgment method, structure natural period estimation system and structure seismic resistance judgment system

摘要

To provide an earthquake resistance determination method of a structure and an earthquake resistance determination system of the structure capable of determining the earthquake resistance considering the cumulative damage of the structure after an earthquake motion.SOLUTION: A natural period estimation method of a structure of the present invention includes: calculating amplitude data for each frequency from acceleration data of the structure undergoing an earthquake motion (S310); when calculating the modified spectral ratio G(ω) on the uppermost stage for the lowermost stage of the structure from amplitude data, calculating the modified spectral ratio G(ω) by adding the value based on the average value of a power spectrum to a denominator (S320); selecting a natural frequency having the highest amplification factor from the modified spectral ratio G(ω) (S330); and calculating a primary natural period from the natural frequency (S370).SELECTED DRAWING: Figure 7