The Tunnel Structural Mode Frequency Characteristics Identification and Analysis Based on a Modified Stochastic Subspace Identification Method

Figure 12

Decomposition of a radial line load and the resulting tunnel response: (a) the first four Fourier components in cross section; (b) schematic map of the steady response system of the tunnel structure; (c) spatial distribution along the x direction [31].

(a)

(b)

(c)