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Structural Vibration Solutions A/S offers state of the art software solving vibration issues of all kind of civil engineering structures.
Testing and analysis of civil engineering structures is a broad topic, that essentially can be divided into two categories:
• Ambient Vibration Testing (AVT).
• Structural Health Monitoring (SHM).
The purpose of an AVT is typically to get detailed knowledge of a structure’s dynamic behavior. This knowledge covers natural frequencies, damping ratios, and high-resolution mode shapes. The information typically requires multi-setup measurement campaigns to maximize mode shape information. It is typically an isolated type of test that is done perhaps only a single time.
Benefits of an AVT:
• Experimentally obtained modal information for Finite Element correlation and updating.
• Critical information of lowest modes for seismic risk analysis and seismic retrofit.
• Baseline information for design of a permanently installed monitoring system.
The ARTeMIS Modal desktop application is a tool that by birth is designed for AVT.
In SHMthe information of an AVT is normally used to assist the design of the monitoring system. Both the type and number of sensors as well as their positions can be determined based on an AVT. The purpose of SHM is to monitor for slowly growing changes of the dynamic behavior as well as sudden (fast growing) changes caused by extreme events, such as earthquakes.
In the case of slowly changing dynamics a system typically monitors for changes of modal parameters, and a range of different damage indicators as well as the channel statistics.
During severe sudden events a monitoring system will compare modes and damage
indicators from before and after the event to check for introduced damage. Local detection of selected structural components might also be made during the actual event using interstorey drift analysis. Finally, seismic ground motion analysis might be made on dedicated ground sensors.
The ARTeMIS Modal desktop application and ARTeMIS-SHM are solutions designed to perform the type of analysis mentioned above using various SHM plugins for ARTeMIS Modal Pro.
ARTeMIS Modal
The slender design of high-rise buildings makes these dynamic sensitive to ambient excitation such as wind and micro-tremors as well as strong motion events such as earthquakes. To reduce the effects of ambient excitation tuned damping systems are often used in this type of structure.
ARTeMIS-SHM
Buildings are designed to stand for many years. However, the health of a structure can deteriorate over years of service due to many reasons. Therefore, continuous monitoring should be undertaken for critical structures in as early a state as possible.
ARTeMIS Modal
AVT is a tool often used by bridge engineers for periodical maintenance inspection and retrofit. Both girders, piers / pylons, and cables can be tested as they are all integrated parts of the safety of a bridge. Prevention of scouring around foundations is also an aspect where AVT is an important tool.
AVT can be performed with the Operational Modal Analysis tools in ARTeMIS Modal.
ARTeMIS-SHM
Aging infrastructure is a problem worldwide. In many cases maintenance has been neglected for years and at the same time traffic has increased with a growing population. World-wide, bridge collapse happens every year with tragic consequences.
ARTeMIS-SHM is designed to monitor multiple structures continuously and notify if global damage indicators exceed thresholds. Both slowly increasing deterioration as well as rapidly increased damage can be detected. This can help extend the lifetime of a bridge as well as keeping it operational with less inspection downtime.
ARTeMIS Modal
AVT is used to study the global behavior of the dam-reservoir-foundation system. Dynamic modes change with the level of water in the reservoir. The AVT are in many cases used for the design of a permanent monitoring system as well as trouble shooting.
AVT can be performed with the Operational Modal Analysis tools in ARTeMIS Modal.
ARTeMIS-SHM
Dams are critical infrastructure and damage can lead to severe loss of property and life and have significant economic implications. Therefore, many large dams are monitored using a vibration based structural health
monitoring system.
ARTeMIS-SHM is designed to analyze the type of ambient response data of structures such as dams. The challenge of this type of data is that the modal response is weak and mixed with forced harmonic response caused by the turbines and pumps running. ARTeMIS-SHM can track modes of the dam, visualize them, and notify the engineers when thresholds are exceeded.