Code - A multiple timescale approach of bispectral correlation

This code aims to reproduce the results presented in the illustrations of the paper entitled "A multiple timescale approach of bispectral correlation" and published in the Journal of Wind Engineering and Industrial Aerodynamics. A model of a simple bridge with three spans and one point load is constructed. Variances and skewnesses are computed in time domain, in the nodal basis and in the modal basis, considering nodal recombinations with or without correlations. These values are compared to the outputs obtained in the frequency domain. There are two methods. The first one is based on the numerical integration of the spectra at 2nd and 3rd orders. The second one is based on the formulas derived in the paper with the help of the Multiple Timescale Spectral Analysis. Proper reference should be made to the paper cited above if the code provided here is used, in part or in full.