FEMA-NIBS Bridge Damage Model

Class Name

• RFemaNibsBridgeDamageModel

Location in Objects Pane

• Models > Model > Consequence > Economic > FEMA-NIBS Bridge Damage

Model Description

Model Form

• This model produces the damage ratio and the percent functional for a bridge subjected to the ground shaking and the permanent ground deformation based on the HAZUS (FEMA-NIBS 2003) approach.
• For further information on this model, refer to FEMA-NIBS (2003).

DDM sensitivities

• No

Properties

Object Name

• Name of the object in Rt
• Allowable characters are upper-case and lower-case letters, numbers, and underscore (“_”).
• The name is unique and case-sensitive.

Display Output

• Determines whether the model is allowed to print messages to the Output Pane.

Analysis Type

• List of the types of analysis including ground shaking, ground failure, or both

Bridge Type

• Type of the bridge according to FEMA-NIBS

Sa 1

• \({S_{a_1}}\) = 5%-damped elastic spectral acceleration at the period of 1.0s at the bridge site

Sa 2

• \({S_{a_2}}\) = 5%-damped elastic spectral acceleration at the period of 0.3s at the bridge site

Time

• Number of days elapsed since the earthquake event

Number of Spans

• Number of Spans (given as an integer)

Angle of Skew

• Angle between the centerline of a pier and a line normal to the roadway centerline (given as a real number)

PGD

• \({PGD}\) = Permanent ground deformation

Bridge Length

• Bridge Length (given as a real number)

Span Width

• Span Width (given as a real number)

Model Uncertainty

• A standard-normal random variable

Output

• Damage Ratio
• Percentage of Functionality
• The output is an automatically generated generic response object, which takes the object name of the model plus “Response”.

Right-click Menu

Remove

• Removes the object.

References

• FEMA-NIBS (2003) Earthquake loss estimation methodology—HAZUS technical manual. Federal Emergency Management Agency and National Institute of Building Sciences, Washington, DC, USA.