Structural Health Monitoring Systems - Cowi

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COWI Expertise COWI is an international consultant that holds a market leading position in bridge, tunnel and marine engineering. COWI possesses a wide range of expertise within core disciplines related to structural monitoring systems: • Planning and design of structural health monitoring systems • Data acquisition • Advanced data transmission • Data analysis • Data presentation • Structural modelling and analysis • Calibration of FEM and life time models • Integration of structural monitoring systems with bridge maintenance planning systems • Establishment of reporting routines and contingency plans engineering area. Numerous and rather sophisticated systems have been established. It is the experience of COWI that an early and thorough discussion with the future stakeholder(s) in the Structural Monitoring programme on the possible objectives and the various system possibilities that are available, paves the way for an efficient and direct path to design, procurement, installation and operation of a sufficient and cost efficient monitoring system. COWI Services Examples of COWI’s services from the various application areas of Structural Monitoring Systems are presented in the following pages. COWI’s ISO 9001 certifi cation covers structural monitoring. Structural Monitoring Structural Monitoring is basically an activity where actual data related to civil structures are observed / measured and registered. This has been performed through all times by responsible designers, contractors and owners with almost identical objectives - to check that the structures behave as intended. Historically the activity has required specialists, has been time consuming and hence costly. This situation has been dramatically changed by the enormous development within information technology in the last two decades. Structural Monitoring has thus emerged as a distinct technical discipline as the new technologies have been introduced in the civil COWI made the conceptual design for the Structural Monitoring System for the Normandy Cable Stay Bridge, France. Calibration of monitoring system by measurement of suspension bridge hanger force by the frequency identifi cation method.
3 The Stonecuttersrs Bridge in Hong Kong will be equipped with an advanced Wind and Structural Health Monitoring System designed by COWI. Actors/Stakeholders The planning of structural monitoring systems must take into account the interests of the different actors in a bridge project. The design-, construction- and operation phases must be considered according to these interests. The objectives, requirements and deliveries deciding the structure of the monitoring system may change depending on whom and what phase the system is supposed to support. The typical groups involved during the construction and service lifetime of a bridge structure are as follows • Owner • Designer • Contractor • Operator • Researchers/Universities Based on the large experience of COWI in designing major bridges world wide the structural monitoring objectives for these actors are in general known by COWI. Structural Monitoring System Objectives The purpose of Structural Monitoring is the examination and location of structural condition and possible damage in the structural elements of a structure set into the context of user objectives, requirements and deliveries. The initial system analysis shall cover and answer the following points according to which user types and phases in the service lifetime the system shall support; • Objective • Requirements • Basis • Scope • Interfaces • Deliveries Structural Monitoring System Activities Technically the developed structural monitoring system will consists of three major parts to meet this way to organise the activities: • Sensing modules placed on the structure. These modules consist of various types of sensors depending on the nature of the structure. This also includes a signal collection and conditioning unit. • A data communication system for the transfer of the collected data to a remote computer. • A database application, which collects, stores and processes the sensor data in real time, in order to provide an evaluation of the condition of the structure based on the above mentioned application areas For all bridge structures where the need for a structural monitoring system is considered there must be carried out an initial analyse to map the deliveries the bridge operator needs for his particular bridge. Hereby the extent of the onstructure installations and the functions of the data management and control can be established in order to secure the most reliable, easy to operate and cost efficient system to design and install.
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Structural Health Monitoring Systems - Cowi

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