Dynamic Testing of Prestressed Concrete Bridges and Numerical Verification

Wahab, M.M. Abdel; Roeck, Guido De

doi:10.1061/(asce)1084-0702(1998)3:4(159)

Cited by 17 publications

(10 citation statements)

References 7 publications

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“…Forced vibration tests are directly related to the application of classical experimental modal analysis (Ewins 2003), in which the bridge is usually excited by artificial means such as eccentric or linear inertial shakers (Halling et al 2001;Brownjohn et al 2003) or drop weights (Abdel Wahab and De Roeck 1998).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Testing of Alfred Zampa Memorial Bridge

Conte

Moaveni

et al. 2008

J. Struct. Eng.

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This paper describes a set of dynamic field tests performed on the Alfred Zampa Memorial Bridge (AZMB), also known as the New Carquinez Bridge, which is located 32km northeast of San Francisco on interstate Highway I-80. The AZMB, opened to traffic in November 2003, is the first suspension bridge in the United States with an orthotropic steel deck, reinforced concrete towers and large-diameter drilled shaft foundations. The dynamic field tests described herein were conducted just before the bridge opening to traffic. They included ambient vibration tests, mainly wind-induced, and forced vibration tests based on controlled traffic loads and vehicle-induced impact loads. Four different controlled traffic load patterns and seven different vehicle-induced impact load configurations were used in the forced vibration tests.The dynamic response of the bridge was measured through an array of 34 uni-axial and 10 tri-axial forcebalanced accelerometers deployed along the whole length of the bridge. These dynamic field tests provided a unique opportunity to determine the dynamic (modal) properties of the bridge in its as-built ST/2006/025227, Revised Version: 06/07/2007 (baseline) condition with no previous traffic loads or seismic excitation. Such properties could be used to validate and/or update the finite element models used in the design phase of this bridge. They could also be used as baseline for future health monitoring studies of this bridge. At the end of the paper, the ambient vibration test data were used to identify the bridge modal parameters (natural frequencies, damping ratios and mode shapes) using the data-driven stochastic subspace identification method.

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Section: Introductionmentioning

confidence: 99%

Dynamic Testing of Alfred Zampa Memorial Bridge

Conte

Moaveni

et al. 2008

J. Struct. Eng.

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“…Alternatively, one may use the system response data for identifying system models admitting a specific form, such as that of the output-only linear stochastic AR representations: The AR representations are primarily used for modeling stationary (in mean and variance) time-series data. However, output signals considered as resulting from impulse tests on -not necessarily stationary-systems (electrical current from energizing transformers, vertical acceleration in bridges [12] and so on) have been successfully modeled by the past. Due to their stochastic framework, the AR representations obtain accurate descriptions of the modeled dynamics, even under typical (for the given case) uncertainties.…”

Section: B Stochastic Modeling Of the System Responsementioning

confidence: 99%

A statistical model-based diagnostic scheme for cost-effective determination of freshness in fish industry

Dimogianopoulos

Grigorakis

2011

2011 19th Mediterranean Conference on Control &Amp; Automation (MED)

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A statistical diagnostic scheme investing on the novel concept of freshness (instead of spoilage) determination in fish industry is presented. Drawing on fault diagnosis expertise, the scheme relies on cost-effective vibration-like testing of fish samples and accurate (under typical uncertainties) stochastic modeling of their response. Via the identified models, specific quantities related to the sample's texture (itself indicative of its freshness) are computed. Then, such quantities from test samples of unknown freshness are compared with the nominal "fresh-fish" values for determining the freshness degree. This comparison is based on custom-built statistical hypothesis tests, capable of issuing reliable decisions while taking into account the risk of the decision-making process. Tests involving 0-, 3-and 6-day-old fish samples show very promising results.Index Terms-Fault diagnosis, statistical decision-making, stochastic systems, industrial application, fish freshness.

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“…Through testing of the Colquitz River Bridge, Ventura et al (1996) showed the consistency of modal parameters identified through step-relaxation excitation and ambient testing. Wahab and De Roeck (1998) investigated the correlation between finite element models and experimental vibration testing using drop weight, test vehicle, and ambient excitation of three bridges in Belgium. Christensen et al (2001) and Halling et al (2004) conducted forced and ambient excitation tests of bridges along the I-15 corridor in Salt Lake City, Utah.…”

Section: A11 Short-to Moderate-span Bridgesmentioning

confidence: 99%