Dynamic Testing and Long Term Monitoring of a Twelve Span Viaduct

Because of the critical importance of bridges in land transport networks and broader economy, an increasing interest in permanent observation of their dynamic behavior under traffic, seismic and other live loads has been observed during the past decade. In addition, recent technological advances have made the installation and operation of permanent dynamic monitoring systems much more practical and economical. A multi-channel dynamic monitoring system is being installed in the 12 span pre-cast, post-tensioned Newmarket Viaduct, recently built using the balanced cantilever method and situated in Auckland, New Zealand. This paper first describes the preliminary studies including extensive one-off ambient vibration tests using wireless sensors that provided important information for the design of the monitoring system shortly after construction of the bridge. Then the designed monitoring system is characterized and proposed research that will be undertaken using the monitoring data is outlined.

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Long-term structural health monitoring of the Crowchild Trail Bridge

Canadian Journal of Civil Engineering ◽

10.1139/l07-073 ◽

2008 ◽

Vol 35 (2) ◽

pp. 179-189 ◽

Cited By ~ 4

Author(s):

Tim R. VanZwol ◽

J. J. Roger Cheng ◽

Gamil Tadros

Keyword(s):

Structural Health Monitoring ◽

Health Monitoring ◽

New Technology ◽

Ambient Vibration ◽

Structural Health ◽

Ambient Vibration Tests ◽

Load Tests ◽

Vibration Tests ◽

Term Performance

Steel-free deck design is a relatively new approach to bridge deck construction. Several steel-free deck bridges constructed in Canada exhibited satisfactory behaviour immediately after construction. However, the long-term health of many of these structures has not been investigated. Significant cracking has been observed in many of these structures after only a few years in service. Long-term structural health monitoring of these structures is key in determining their long-term performance and future adoption of this new technology. Structural health monitoring data were obtained from the steel-free deck of the Crowchild Trail Bridge during its first seven years in service. Field monitoring included ambient vibration tests, static and dynamic load tests, and deck crack mapping. Despite significant amounts of cracks in the concrete deck and barriers, the overall behaviour of the Crowchild Trail Bridge has remained satisfactory and consistent. Future steel-free deck designs should consider crack control to meet serviceability requirements.

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Effects of Seismic Damage and Retrofitting on a Full-scale Substandard RC Building-Ambient Vibration Tests

Journal of Earthquake Engineering ◽

10.1080/13632469.2021.1887009 ◽

2021 ◽

pp. 1-28

Author(s):

Pinar Inci ◽

Caglar Goksu ◽

Erkan Tore ◽

Alper Ilki

Keyword(s):

Seismic Damage ◽

Full Scale ◽

Ambient Vibration ◽

Ambient Vibration Tests ◽

Rc Building ◽

Vibration Tests

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Ambient Vibration Tests of an Arch Dam with Different Reservoir Water Levels: Experimental Results and Comparison with Finite Element Modelling

The Scientific World JOURNAL ◽

10.1155/2014/692709 ◽

2014 ◽

Vol 2014 ◽

pp. 1-12 ◽

Cited By ~ 6

Author(s):

Sergio Vincenzo Calcina ◽

Laura Eltrudis ◽

Luca Piroddi ◽

Gaetano Ranieri

Keyword(s):

Finite Element ◽

Natural Frequencies ◽

Water Levels ◽

Arch Dam ◽

Experimental Results ◽

Ambient Vibration ◽

Reservoir Water ◽

Ambient Vibration Tests ◽

Vibration Properties ◽

Vibration Tests

This paper deals with the ambient vibration tests performed in an arch dam in two different working conditions in order to assess the effect produced by two different reservoir water levels on the structural vibration properties. The study consists of an experimental part and a numerical part. The experimental tests were carried out in two different periods of the year, at the beginning of autumn (October 2012) and at the end of winter (March 2013), respectively. The measurements were performed using a fast technique based on asynchronous records of microtremor time-series. In-contact single-station measurements were done by means of one single high resolution triaxial tromometer and two low-frequency seismometers, placed in different points of the structure. The Standard Spectral Ratio method has been used to evaluate the natural frequencies of vibration of the structure. A 3D finite element model of the arch dam-reservoir-foundation system has been developed to verify analytically determined vibration properties, such as natural frequencies and mode shapes, and their changes linked to water level with the experimental results.

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