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CAP in Earthquake CAP in Earthquake Damage MessagingDamage Messaging
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Presentation Outline
• Automated Post-earthquake Building Damage Assessment
• The GSense system at a glance
• Architecture and Information Flow
• CAP Router and CAP Alerts
• G-Sense Operator Software
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Drift-based Fragility Curves and Damage Assessment
Farzad Naeim et.al. 2005
No
Dam
age
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ht D
amag
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oder
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Dam
age
Seve
re D
amag
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A Validated Approach - Imperial Valley 1979
CSMIP Project - Imperial Valley County Services (CSMIP ID = 01260)
IDR
Pro
bab
ilit
y
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A Validated Approach - Northridge 1994 Earthquake CSMIP Project - The Van Nuys 7-Story Hotel (CSMIP ID = 24386)
Farzad Naeim et.al. 2005
Drift-based Fragility Curves and Damage Assessment
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GSense System at a Glance
• A network of sensor nodes installed in different floors of a building measuring acceleration.
• The nodes include a low noise MEMS tri-axial accelerometer, a 16bit ADC, a power control (UPS) unit, an integrated processing unit enabling on-board processing, GPS option for time synchronization and a gateway (mini PC) for real-time data acquisition, analysis and archiving.
• The gateway is calculating damage probabilities for every floor following an earthquake event and sends damage alerts through CAP to a central command and control software (GSense Operator).
• The GSense Operator visualize the alerts, monitors all Gsense installations in different buildings, the nodes state of health and manages the nodes and gateway configuration remotely when required.
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Information Flow
CAP Router
GSense Node
GSense Gateway
Buildinginstallations
GSense OperatorAgency #2
GSense Remote Administration
44
66
EDXL-DECAP Alert
33
Real time acceleration dataReal time acceleration data
22
Real time On-Site Analysis
•Interstory Drift•Shear Wave velocity•Base Shear•PGA , PGV
Real time On-Site Analysis
•Interstory Drift•Shear Wave velocity•Base Shear•PGA , PGV
CAP Alert message containing information
of detected event
CAP Alert message containing information
of detected event
Event detection using STA/LTA algorithm
on real time acceleration data
Event detection using STA/LTA algorithm
on real time acceleration data
GSense OperatorAgency #1
Network
11
Network
Other CAP Consumer application
Other CAP Consumer application
55
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GSense Node
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Pilot Installations
Technological Educational Institute of Crete, ChaniaCentral Administration building of Aristotle
University, Thessaloniki
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Time Synchronization (<50 μsec)
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Earthquake Recording Example
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GSense Gateway
GSense Gateway is a Mini-PC used for:
•Real Time Data Acquisition from GSense Nodes
•Data Archiving and Storage
•On-Site Data Analysis (Shear Wave Velocity, Base Shear, PGA , PGV, Interstory Drift)
•Real Time Event Detection using STA/LTA Algorithm
•Damage Probabilities Calculation for every Floor and Direction
•CAP Alert Generation
•CAP Router interconnection
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On-Site Analysis Software
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Event Detection
STA/LTA Algorithm:
Channel Trigger1) Averages of signal amplitudes are calculated for a short and a long time window
2) A ratio of both values - STA/LTA ratio - is calculated
This ratio is continuously compared to STA/LTA trigger threshold level.
If the ratio exceeds this threshold, a channel trigger is declared.
When the current STA/LTA ratio falls below STA/LTA detrigger threshold level the channel detriggers.
Event TriggerEarthquake event is considered if a predefined number of channels are triggered at the same time
Trigger Threshold
Detrigger Threshold
Event Data
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Inter-Story Drift Calculation
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CAP Alert Example
4 Parameters (Value Pairs) Per Floor and Direction to Display Damage Assessment.
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The CAP Router (1)
• A software service which enables messages to be routed according to their header information
• Based on EDXL-DE (Distribution Element) and an Event Driven Architecture (EDA)
• Each agency or organization is seen is registered to the CAP Router as an “endpoint”
• Endpoints can be both message publishers and/or message consumers
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The CAP Router device consists of four main services. These are as follows:
1. Registration Service– Each endpoint has a responsibility to announce themselves to the Message Router along with their reachability attributes:•URN•Descriptive Name•Attributes and methods of communication with the end-point (currently only via a Message Broker)•The messages they wish to receive based on
• Message Type• Geographical areas of interest• Keywords
The CAP Router (2)
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The CAP Router (3)
2. Message Service – Each publisher endpoint or any generator of information contacts the consumer and hands over the message for delivery specifying the recipients. The following process will be followed on reception:•Check if the publisher and consumer are valid•Check if the consumer endpoint is available•Analyze the Distribution Element information•Send message to consumer endpoint(s) which match the EDXL-DE info•Cache message should the consumer endpoint not be available
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The CAP Router (4)
3. Query Service – The Query service interfaces the Persistence Serviceand allows endpoints to query:•which endpoints have been registered in the Router•Available consumer Roles•Available consumer keywords•Available consumer areas
This allows the publisher endpoints to insert the appropriate recipient information in the EDXL-DE envelope.
For the GSense system the Query service is accessed by the Gateway Remote Administration application is order to setup the selection of the CAP Alert consumers.
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GSense Operator
• Multi-user and Multi-agency installation• Visualization of sensors and gateways• Interconnection with the CAP Router• Management of equipment (sensors
and gateways)
• Tabular list of CAP alerts• Graphical depiction of damage
probabilities• Intuitive 3D Map Visualization
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GSense Remote Administration
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3 Chr. Lada Str., Athens, GreeceTel: +30-210-6840036Fax: +30-210-6840037Web: www.satways.netEmail: [email protected]