Seismic Fragility Analysis of Multispan Reinforced Concrete Bridges Using Mainshock-Aftershock Sequences

Table 2

Variable modeling parameters with upper and lower levels in the study.

Modeling parameters	Units	Distribution	Lower	Median	Upper
Bearing stiffness	-	Lognormal	0.09	0.2	0.48
Coefficient of friction	-	Uniform	0.55	1	1.45
Damping ratio	-	Normal	0.03	0.04	0.05
Deck-abutment gap	mm	Normal	101.6	128.2	155.8
Steel yield strength	MPa	Lognormal	405	435	510
Steel stiffness	MPa	Lognormal	1.4e5	2.0e5	2.8e5
Concrete yield strength	MPa	Lognormal	26.6	38.3	47.9
Concrete ultimate strength	MPa	Lognormal	16.1	26.73	37.4