Structure Strengthening Method for Enhancing Seismic Behavior of Soft Tunnel Portal Section

Table 3

PGA amplification factor.

Section	Case 1 (%)	Case 2 (%)	Case 3 (%)	Case 4 (%)
A	60.17	61.18	62.45	63.78
B	53.06	54.23	54.90	56.40
C	42.14	43.56	44.58	45.24
D	24.59	25.20	26.40	28.13
E	21.37	20.69	21.37	22.03