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

Table 10

Load combinations, including a horizontal component having coefficient 0.75 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)
6	0.75H + 0.25V	0.33
7	0.75H + 0.5V	0.67
8	0.75H + 0.75V	1.0
9	0.75H + V	1.33
10	0.75H + 1.25V	1.66