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: Wall Piers

Parameters	Values
ρ_l	0.005	0.01	0.02	0.03
ρ_w	0.005	0.008	0.01
h (m)	4	5	6
b/h	0.2	0.25	0.3
f_c (MPa)	16	20	25	35
f_y (MPa)	220	400	500
v	0.15	0.25	0.3
Combinations Number: 3888

Closed-form relationships M-phi (strong direction)

φ_y Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
φ_y	-5.355	-0.001	-0.165	-0.602	0.418	0.085

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

φ_y :

φ_u Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
φ_u	-2.042	0.098	0.197	0.078	-0.101	0.077

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

φ_u :

M_y Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
M_y	-0.659	-0.015	0.523	-0.336	0.313	0.026

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

M_y :

M_u Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
M_u	-0.641	-0.015	0.527	-0.322	0.301	0.03

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

M_u :

Closed-form relationships M-phi (weak direction)

φ_y Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
φ_y	-4.746	-0.216	-0.103	-0.733	0.553	0.119

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

φ_y :

φ_u Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
φ_u	-1.411	-0.854	0.058	-0.005	0.009	-0.003

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

φ_u :

M_y Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
M_y	-0.342	-0.076	0.51	-0.341	0.317	0.044

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

M_y :

M_u Calculation

	β₀	β₁	β₂	β₃	β₄	β₅
M_u	-0.471	-0.027	0.546	-0.317	0.296	0.017

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

M_u :

Closed-form relationships d/h (strong direction)

d₁/H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₁/H	-6.65	-0.447	-0.23	-0.142	-0.423	0.067	0.294

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

d₁/H :

d₁ :

d₂/H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₂/H	-4.021	-0.804	-0.645	0.39	-0.102	-0.018	0.113

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

d₂/H :

d₂ :

d₃/H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₃/H	2.58	-0.793	-1.003	0.482	-0.306	1.096	0.13

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

d₃/H :

d₃ :

d₄/H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₄/H	-3.45	-0.842	-0.054	0.19	0.069	0.082	-0.095

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

d₄/H :

d₄ :

Closed-form relationships d/h (weak direction)

d₁/ H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₁/ H	-5.957	-0.861	0.707	-0.096	-0.69	0.115	0.521

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

d₁/ H :

d₁/ :

d₂/ H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₂/ H	-5.681	-0.871	0.164	-0.062	-0.266	0.044	0.217

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

d₂/ H :

d₂/ :

d₃/ H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₃/ H	0.096	-0.81	-0.057	-0.086	-0.339	1.075	0.13

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

d₃/ H :

d₃/ :

d₄/ H Calculation

	β₀	β₁	β₂	β₃	β₄	β₅	β₆
d₄/ H	-3.91	-0.864	0.085	0.036	-0.079	0.009	0.064

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

d₄/ H :

d₄/ :