# 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).

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## 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”.