Correlation Effects of Near-Field Seismic Components in Circular Metro Tunnels: A Case Study—Tehran Metro Tunnels

Table 11

Load combinations, including a horizontal component having coefficient 1.25 and a vertical component with a variable coefficient.

Load combination number	Load combination	The coefficient ratio of the vertical component to the horizontal component (β/α)
11	1.25H + 0.25V	0.2
12	1.25H + 0.5V	0.4
13	1.25H + 0.75V	0.6
14	1.25H + V	0.8
15	1.25H + 1.25V	1