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

Table 6

Comparison of various methods for computing the 𝑃_𝑓 (LSF: 𝑔₂=𝑢_limit−(𝑢₁−𝑢₃)).

	Δlimit (cm)	5.0	7.5	10.0	14.4
FORM	𝑃𝑓	1.07𝑒−2	5.37𝑒−4	8.10𝑒−4	1.69𝑒−4
	Number of evaluations	10	10	12	18
MCS	𝑃𝑓	1.08𝑒−1	5.7𝑒−3	5.0𝑒−4	0
	c.o.v	0.029	0.132	0.045	—
	Number of evaluations	10000	10000	10000	10000
IS	𝑃𝑓	1.1𝑒−1	5.17𝑒−3	7.65𝑒−4	1.53𝑒−4
	c.o.v	0.1	0.1	0.1	0.1
	Number of evaluations	185	397	404	506
OPS	𝑃𝑓	9.13𝑒−2	4.94𝑒−4	7.39𝑒−4	1.27𝑒−4
	c.o.v	0.1	0.1		0.1
	Number of samplings	123	119	120	150
	Number of evaluations	613	696	784	1270