Performance and Risk Assessment of Soil-Structure Interaction Systems Based on Finite Element Reliability Methods

Table 7

Comparison of mean outcrossing rate and mean outcrossing events obtained by using FORM, OPS, and MCS.

Time (sec)	Mean outcrossing rate		Failure probability (%)			Number of simulations
	FORM	OPS	FORM	OPS	MCS	OPS	MCS
0.5	2.62𝑒−2	1.57𝑒−2	0.66	0.39	0.14	1631	2800
1.0	7.99𝑒−2	5.56𝑒−2	3.31	2.17	1.99	1809	2800
1.5	1.28𝑒−1	5.37𝑒−2	8.51	4.91	4.05	2398	2800
2.0	1.61𝑒−1	6.47𝑒−2	15.73	7.87	6.75	2300	2800
2.5	1.22𝑒−1	7.34𝑒−2	22.81	11.32	9.24	3058	2800
3.0	1.25𝑒−1	6.57𝑒−2	28.98	14.80	12.37		2800