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  • Bridge Fragility

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Field Name

Field Description

Field Type

Acceptable Values

Informational

ID

Unique numeric identifier in the fragility dataset

Integer

N/A

No

Author

Identifies the person(s) who provided each fragility set.

String

N/A

Yes

Structure Type

Structure Type this fragility curve is designed for

String

N/A

Yes

Description

A textual description providing information about the derivation of this fragility curve set

String

N/A

Yes

Ground Motions

Ground motion records used for time-history analyses when constructing fragilities

String

N/A

Yes

Code

Design code for the fragility set

String

low - no retrofit, seat extender, steel jacket, Restrainer cables, Shear Key, Elastomeric Bearing

Yes

Damage Type

The type of damage type this fragility represents

String

Structural

Yes

Demand Type

The demand type required by the fragility, can include the period if applicable (e.g. 0.2 Sa )

String

PGA, PGV, PGD, Sa, Sd, Sv

No

Demand Units

The units of the demand type

String

g (typically), could be other values if another demand type is specified

No

Limit States

The limit states of the fragility curves, Ergo expects 4 limit states. This tells Ergo how many fragility curves to expect.

String

Slight: Moderate: Extensive: Complete

No

Equation Type

The fragility equation type

Integer

1 - Lognormal distribution, 2 - Normal Distribution

No

Parameters

The number of fragility parameters present (should be 2 parameters per fragility, median and beta)

Integer

N/A

No

Median0First fragility median valueDoubleN/ANo
Beta0First fragility beta valueDoubleN/ANo
Median1Second fragility median valueDoubleN/ANo
Beta1Second fragility beta valueDoubleN/ANo
Median2Third fragility median valueDoubleN/ANo
Beta2Third fragility beta valueDoubleN/ANo

After the Parameters field, specify the fragility parameters for each curve. Each curve should have a pair of parameters and the keyword for the fields are the words Median and Beta followed by a number that specifies which curve the parameter belongs to. Number should start at zero so if we have 2 fragility curves, the following 4 additional fields would be in the file:

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