“…The array of models was iterated and interpolated within 95% confidence interval, the R 2 and modified R 2 were both above 0.99, and the established matrix was favourable diagonal. Among Equations 1-4, Sd stands for the sample size or fragility parameters of seismic damage to bridge, Rd for the grade of seismic damage (as the fragility model for the surveyed areas that was numbered between integer one and five, and these integers corresponded to the five seismic damage grades), n0, n1, n2, n3 and n4 for polynomial regression parameters, c1, c2, d1, d2, m1 and m2 for Gaussian regression parameters, a1, a2, b1 and b2 for exponential regression parameters, and f, g1, g2, g3, g4, p1 and p2 for Fourier regression parameters [6][7][8][9][10][11].…”