Decision-Support-System for the Rehabilitation of
Buildings: The MEMSCON Project
RISA Sicherheitsanalysen GmbH
Berlin
1st MEMSCON Event - 07 October 2010, Bucharest
Objectives
To assess structural damage in a monitored reinforced concrete building after an earthquake and to select the best repair method and determine its cost.
To assess structural deterioration in a monitored reinforced concrete building because of differential settlement between foundations and to select the best repair or strengthening method and determine its cost.
1st MEMSCON Event - 07 October 2010, Bucharest
DSS
Definition of DSS An integrated software package to support decision
makers (managers) by providing accurate and fast information as a base for a decision. Explains the solution and rationale The assimilation and filtering of data Assists with problem recognition Assists with problem solving Presents the results into a cohesive package
1st MEMSCON Event - 07 October 2010, Bucharest
Modules and Data Flow
Civil engineering software to assess internal forces at the columns of the ground floor
and from these the differential settlements between foundations
Finite element analysis to access the safety
factor of the structural elements and the
identification of the locations requiring
repair or strengthening
Civil engineering software to select
repair or strengthening
methods and assess their costs
Initial conditions at the time of the earthquake
Civil engineering software for seismic
damage
Local degree of seismic damage (in
each structural element) and global
instability
Civil engineering software to select
repair and strengthening
methods and costs
Acceleration measurements
during an earthquake
Measurements of strain at the
columns’ bottom cross-section at the ground floor level
1st MEMSCON Event - 07 October 2010, Bucharest
System architecture of the DSS
General Architecture of the Software in the Proposed DSS.
Actual sensor data
Data Base Calculation modules
User Interface Query
Manager
Data Manager
EXPERT SYSTEM
Knowledge Base
1st MEMSCON Event - 07 October 2010, Bucharest
Expert System
The expert system acts and behaves like a human expert in the field of Structural Monitoring
It acts as intelligent intermediary that handles the system resources in order to respond effectively to the user queries
Ensures the successful integration and coordination of all individual modules.
Self-contained black-box modules can be plugged in and out with minimal overall system modifications.
1st MEMSCON Event - 07 October 2010, Bucharest
Expert System
The expert system consists of a collection of integrated and related components, including
User Interface: provides visualization of the results calculated by other modules in a textual and graphical manner
Query Manager: schedules proper sub-query processing actions, interacts with the data manager , translates the user request to appropriate subroutine calls
Data Manager: provides suitable data to caller modules, according to the module’s particular view
1st MEMSCON Event - 07 October 2010, Bucharest
Knowledge base and Database
The knowledge base assembles the knowledge of multiple human experts.
The Database stores all relevant information, data (structural element information and sensor measurements), rules, cases, and relationships used by the expert system.
1st MEMSCON Event - 07 October 2010, Bucharest
Developed DSS 1/2
Building status Viewer
The Graphical User Interface: provides the graphical environment with which the end-user will retrieve current and historical data from the DB provides real-time alerts and warnings in case of abnormal situations allows the end-user to examine different scenarios for hypothetical situations
1st MEMSCON Event - 07 October 2010, Bucharest
Developed DSS 2/3
Common interface with Sap2000 and ETABS.Establish a connection to the ETABS DB and create a robust data management application.Retrieve data concerning the structural elements (columns, beams) of any building in use.Update or add data to structure
1st MEMSCON Event - 07 October 2010, Bucharest
Developed DSS 3/3
Strain sensor measurements viewer
Graphic representation of data retrieved from the Sensor DB is supported, according to the context in which they are requestedMechanism for simulation of earthquakes
1st MEMSCON Event - 07 October 2010, Bucharest
Conclusions
So far, the results show that DSS corresponds to engineers' needs
The main advantage seems to be the integration of several expert opinions and cutting-edge methodologies
The approach has potential applications to other engineering tasks (bridges)
1st MEMSCON Event - 07 October 2010, Bucharest
Thank you for your attention
1st MEMSCON Event - 07 October 2010, Bucharest