Structural Health Monitoring Systems - Cowi

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4 Structural Monitoring Decision Making Process and Objectives The objective of Structural Monitoring is to provide the necessary information of the structural condition and possible damage in order to provide the documented basis for decisions concerning these matters. All structural monitoring systems regardless size operates on different levels for the management and control of acquired data. These levels can be expressed by a generic model for structural monitoring to identify strategic, analyse/planning and operational goals. Using such a model will ensure that managers on different levels of the bridge operation organisation will have the correct level of information to support there decisions. Reporting Reporting Reporting Evaluation Strategic Implementation Evaluation Analyse/ Planning Implementation Evaluation Operational Implementation Generic model for the organisation of structural monitoring activities. Requirements Requirements Requirements Organisation of structural monitoring data Strategic Reports Tactical Statistical info… Operational Data acquisition Storage of raw data…. Organisation of Structural Monitoring Data The structural monitoring basis is the acquired data from sensors installed on the structure. In order to support the above discussed organisation of structural monitoring activities the data must be organised the same way. On the operational level there will be one or several individual data acquisition systems storing the raw data in preset formats or databases. From these raw data statistical information and sample time series selected based on the bypass of preset trigger levels will be passed on to the analysing and planning level. Only the results of the management and control performed at the analysing and planning level will be reported at the strategic level. Alarms affecting the immedial safety of the bridge will always be reported instantaneous to all affected managers in the bridge organisation. Prioritisation of Structural Monitoring Deliveries Most important for the planning of a structural monitoring system is the initial analyse to map the deliveries the system user needs for his particular bridge based on the above discussed considerations to take into account. The structural components assessed to have a need for monitoring shall be listed in a prioritised list and grouped as; • Need to know information • Nice to know information • Scientific information. The list shall be discussed with the actors; structural bridge designer, the bridge operator and if a maintenance unit is planned also the designer of maintenance activities according to the actors and their interests The storage, processing and management of monitoring information shall reflect this list. The management and control of the groups shall be put into the shown generic model.
5 The SuTong Bridge in China is designed with a sofi sticated structural monitoring system including all application areas of structural monitoring. Guideline for Structural Monitoring System Parameters Objectives The overall aims for structural monitoring systems are to • ensure safe structures • obtain rational and economic maintenance planning • attain safe & economic operation • identify causes for unacceptable responses Application Areas Design Verification Structural monitoring systems can acquire data on loads and structural responses over long measurement periods to verify stochastic load parameters and compare them with design requirements and calculated response. Short time monitoring can include forced loading on a structure. Maintenance Planning Monitoring of structures can provide quantification of degradation rates and wear which are essential to a regular updating of information on structural states. This in turn can be used in rational planning of inspection, maintenance activities and calibration of lifetime models. User Safety Structural integrity of critical elements may be crucial to the operational safety of structural systems. Continuous surveillance of such elements can provide information or alarms to intervene before severe consequences develop. Trouble Shooting Intermittent and insuffi ciently understood responses of structures and associated load parameters (often wind) can be documented through automated measuring campaigns - often of extended duration. Example on a SHMS user interface for the Neva Bridge, Russia, developed by Futertec, Finland.
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Structural Health Monitoring Systems - Cowi

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