Under DevelopmentPlease cite this work as:Stefanidou, S., Paraskevopoulos, E., Papanikolaou, V., Kappos, A.J. "An online platform for bridge-specific fragility analysis of as-built and retrofitted bridges", Bulletin of Earthquake Engineering, 20, 1717-1737 (2022). https://doi.org/10.1007/s10518-021-01299-3

The Bridge Database - ESPA

Closed form relationships: Hollow Cylindrical Piers

Parameters	Values
ρ_l	0.005	0.01	0.02	0.03
ρ_w	0.005	0.010	0.012	0.015
D (m)	1.5	2	3	3.5
t/D	0.33	0.2
f_c (MPa)	16	20	25	35
f_y (MPa)	220	400	500
v	0.15	0.2	0.3	0.4
Combinations Number: 6144

Closed-form relationships M-phi

φ_y Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
φ_y	-6.04	-0.617	-0.254	0.43	-0.015	-0.014

Please fill in the following parameters and press "Calculate".

φ_y :

φ_u Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
φ_u	-5.74	-0.224	-0.956	-0.096	0.038	-0.13

Please fill in the following parameters and press "Calculate".

φ_u :

M_y Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
M_y	-0.78	-0.427	0.286	0.431	-0.006	-0.01

Please fill in the following parameters and press "Calculate".

M_y :

M_u Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
M_u	-0.78	-0.43	0.318	0.419	-0.0014	-0.062

Please fill in the following parameters and press "Calculate".

M_u :

Closed-form relationships d/h

d₁/H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₁/H	-5.996	-0.445	-0.007	-0.198	-0.47	-0.117	0.334

Please fill in the following parameters and press "Calculate".

d₁/H :

d₁ :

d₂/H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₂/H	-5.285	-0.385	0.224	-0.352	0.106	-0.0013	-0.135

Please fill in the following parameters and press "Calculate".

d₂/H :

d₂ :

d₃/H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₃/H	-3.867	-0.287	-0.084	-0.486	-0.433	0.375	-0.071

Please fill in the following parameters and press "Calculate".

d₃/H :

d₃ :

d₄/H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₄/H	-5.863	-0.308	-0.119	-0.885	-0.219	0.031	-0.079

Please fill in the following parameters and press "Calculate".

d₄/H :

d₄ :