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

Table 9

Load combinations, including a horizontal component having coefficient 1 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)
1	H + 0.25V	0.25
2	H + 0.5V	0.5
3	H + 0.75V	0.75
4	H + V	1
5	H + 1.25V	1.25