Nested Copula Model for Overall Seismic Vulnerability Analysis of Multispan Bridges

Table 3

Uncertainty parameters in bridges.

Uncertainty parameters	Distribution type	Mean	Coefficient of variation
Rebar yield strength (MPa)	Lognormal distribution	335.00	0.05
Compressive strength of bridge pier concrete (MPa)	Normal distribution	51.89	0.11
Elastic modulus of bridge pier (MPa)	Normal distribution	3.45 × 10^4	0.11
Elastic modulus of main beam concrete (MPa)	Normal distribution	3.55 × 10^4	0.11
Friction coefficient of basin support	Normal distribution	0.02	0.50
Superstructure mass (T/m^3)	Normal distribution	2.70	0.10
Damping ratio	Normal distribution	0.05	0.20
Expansion joint (cm)	Normal distribution	24.00	0.20
Concrete protective layer thickness (cm)	Normal distribution	3.50	0.20