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.
liquefaction_geology_dataset_id	str	Liquefaction id	Liquefaction geology/susceptibility dataset id. If not provided, liquefaction will be ignored.

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.

Input Hazards

key name	type	name	description
hazard	earthquake tornado hurricane flood tsunami	Hazard	Supported hazard object for using local and remote hazards.

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