Bridge damage#

Description

This analysis computes bridge damage based on a particular hazard. Currently supported hazards are: earthquake, tsunami, tornado and hurricane.

The process for computing the structural damage is similar to other parts of the built environment. First, a fragility is obtained based on the hazard type and attributes of the bridge. Based on the fragility, the hazard intensity at the location of the bridge is computed. Using this information, the probability of exceeding each limit state is computed, along with the probability of damage. For the case of an earthquake hazard, if the bridge dataset contains soil information, the median value of the associated fragility can be modified to account for liquefaction in the damage.

The outputs of this analysis are CSV file with probabilities of damage and JSON file with information about hazard and fragilities.

Input parameters

key name

type

name

description

result_name *

str

Result name

Name of the result dataset.

hazard_type *

str

Hazard type

Hazard type (earthquake, tsunami, tornado, hurricaneWindfields).

hazard_id *

str

Hazard id

ID of the hazard from the Hazard service.

fragility_key

str

Fragility key

Fragility key used in mapping dataset.

use_liquefaction

bool

Liquefaction

Use liquefaction, if applicable to the hazard.
Default is False.

use_hazard_uncertainty

bool

Uncertainty

Use hazard uncertainty.

num_cpu

int

Number of CPUs

Number of CPUs used for parallel computation.
Default is 1.

Input datasets

key name

type

name

description

bridges *

ergo:bridges

Bridge dataset

A bridge dataset.

dfr3_mapping_set *

incore:dfr3MappingSet

DFR3 Mapping Set

DFR3 Mapping Set.

Output datasets

key name

type

parent key

name

description

result *

ergo:bridgeDamageVer2

bridges

Results

A dataset containing results
(format: CSV).

damage_result *

incore:bridgeDamageSupplement

bridges

Results

Information about applied hazard value and fragility
(format: JSON).

(* required)

Execution

code snippet:

    # Create bridge damage
    bridge_dmg = BridgeDamage(client)

    # Load input dataset
    bridge_dmg.load_remote_input_dataset("bridges", bridge_dataset_id)

    # Load fragility mapping
    fragility_service = FragilityService(client)
    mapping_set = MappingSet(fragility_service.get_mapping(mapping_id))
    bridge_dmg.set_input_dataset('dfr3_mapping_set', mapping_set)

    # Specify the result name
    result_name = "bridge_result"

    # Set analysis parameters
    bridge_dmg.set_parameter("result_name", result_name)
    bridge_dmg.set_parameter("hazard_type", hazard_type)
    bridge_dmg.set_parameter("hazard_id", hazard_id)
    bridge_dmg.set_parameter("num_cpu", 4)

    # Run bridge damage analysis
    bridge_dmg.run_analysis()

full analysis: bridge_dmg.ipynb