# Building Repair Cost Model

## Class Name

## Location in Objects Pane

- Models > Model > Consequence > Economic > Building Repair Cost

## Model Description

### Model Form

$$l =\left( {{\eta _S} \cdot {C_S} + {\eta _{ND}} \cdot {C_{ND}} + {\eta _{NA}} \cdot {C_{NA}} + {\eta _C} \cdot {C_C}} \right) \cdot A \cdot \exp \left( { - r \cdot t} \right) \cdot \varepsilon $$
where Building repair cost model gets the “\({A}\)” parameter from the Building information model.

**Important Notes: **
- if the structural damage ratio exceeds the threshold, i.e. \({\eta _S}\) > \({\eta_R}\), all damage ratios are set to 1 and the loss is computed based on the modified values
- The cost of repair operation is computed once it is completed (i.e. the repair status changes to 1), otherwise it is 0.
- To use this model in analyzers other than Discrete Event Sampling Anlyzer, the "RepairStatus" property must be a constant parameter with current value of 1
- For further information on this model, refer to Mahsuli, M., Haukaas, T. (2013) and Mahsuli, M., Haukaas, T. (2013).

### DDM sensitivities

## 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.

- A building information model object that returns the total area of the building, \({A}\), to this model.

### Repairability Structural Damage Ratio

- \({\eta_R}\) = The threshold of Structural Damage Ratio by which the building can be repaired, otherwise, it needs to be demolished and reconstructed

### Structural Damage Ratio

- \({\eta_S}\) = Structural damage ratio

### Nonstructural Drift Damage Ratio

- \({\eta_{ND}}\) = Non-structural drift damage ratio

### Nonstructural Acceleration Damage Ratio

- \({\eta_{NA}}\) = Non-structural acceleration damage ratio

### Content Damage Ratio

- \({\eta_C}\) = Content damage ratio

### Structural Unit Area Cost

- \({C_S}\) = Structural unit area cost (given as a real number)

### Nonstructural Drift Unit Area Cost

- \({C_{ND}}\) = Non-structural drift unit area cost (given as a real number)

### Nonstructural Acceleration Unit Area Cost

- \({C_{NA}}\) = Non-structural acceleration unit area cost (given as a real number)

### Content Unit Area Cost

- \({C_C}\) = Content unit area cost (given as a real number)

### Time

### Annual Interest Rate

- \({r}\) = Annual interest rate

### Epsilon

- \({\varepsilon}\) = Model error

### Repair Status

- \({\varsigma}\) = Status of Repair operation (1 if completed, 0 otherwise)

## Output

- \({l}\) = Loss due to the repair cost
- The output is an automatically generated generic response object, which takes the object name of the model plus “Response”.

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## References

- Mahsuli, M., Haukaas, T. (2013) “Seismic risk analysis with reliability methods, part I: Models,” Structural Safety, 42, pp. 54-62 (DOI)
- Mahsuli, M., Haukaas, T. (2013) “Seismic risk analysis with reliability methods, part II: Analysis,” Structural Safety, 42, pp. 63-74 (DOI)