Condition assessment and retrofit of a historic steel-truss railway bridge

Spyrakos, Constantine C.; Raftoyiannis, Ioannis G.; Ermopoulos, John

doi:10.1016/j.jcsr.2003.11.004

Cited by 48 publications

(26 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Similar studies were conducted by Ye et al (2005) on the Brooklyn Bridge and Harik et al (1997) on a double-deck cantilever throughtruss bridge. Ermopoulos and Spyrakos (2006) and Spyrakos et al (2004) have tested historic railway steel truss bridges still in service, 1 Ph.D. Researcher, Faculty of Engineering, Dept.…”

Section: Dynamic Testing In the Assessment Of Old Steel Bridgesmentioning

confidence: 99%

Modal Analysis for the Rehabilitation Assessment of the Luiz I Bridge

et al. 2014

View full text Add to dashboard Cite

Dynamic testing in the condition assessment of existing bridges to support their rehabilitation and strengthening designs is becoming a common procedure, yet additional dynamic testing after rehabilitation is rare. Nevertheless, combining the results of dynamic testing before and after bridge rehabilitation produces unique and valuable information regarding changes occurred in a bridge's dynamic properties. Such dual testing would allow researchers to verify the behavior predicted at the design stage and to assess the stiffness variation, which would eliminate the need for mandatory field static testing. This article reports the modal analysis of a unique centenary steel-arch bridge that was recently rehabilitated and strengthened. The ambient vibration test conducted after the construction works is described, and the data are compared with those collected before the rehabilitation. Structural identification is completed by means of experimentally validated threedimensional (3D) finite-element (FE) models simulating both phases. The results bring to light important findings concerning variation in bridge stiffness, changes in the modal parameters, and the impact of support conditions and structure of decks in bridge dynamic properties.

show abstract

Section: Dynamic Testing In the Assessment Of Old Steel Bridgesmentioning

confidence: 99%

Modal Analysis for the Rehabilitation Assessment of the Luiz I Bridge

et al. 2014

View full text Add to dashboard Cite

show abstract

“…As-built drawing and design data were not available, an extensive investigative program was chalked out, comprising preparation of the as-built drawings at the site, development of analytical model to obtain the baseline structural parameter, and conduct of field tests to obtain the present status of the bridge [23].…”

Section: Introductionmentioning

confidence: 99%

Time–frequency and wavelet-based study of an old steel truss bridge before and after retrofitting

Walia

Patel

Vinayak

et al. 2015

J Civil Struct Health Monit

View full text Add to dashboard Cite

Signal-processing techniques have been widely used in structural health monitoring and nondestructive evaluation. Wavelet analysis, a relatively new mathematical and signal-processing tool, for damage detection in various civil and mechanical structures. It is a time-frequency analysis that provides more detailed information about nonstationary signals which traditional Fourier analysis miss. This paper aims to provide the damage identification in an existing 100-year-old deck-type steel truss bridge using-frequency-and time-frequency-based approaches. The dynamic testing of steel bridge was carried out using accelerometers for the damaged state and after partial retrofitting under similar environmental conditions and instrumental set up. The comparison is carried out using power spectral density, short-time Fourier transform, and wavelet packet transform with respect to both the upstream and the downstream trusses of the bridge. Higher and uniform dissipation of energy at resonatingfrequency of the respective node after retrofitting showed intactness of joints. The variations of power spectral density in the first mode of the upstream and the downstream trusses clearly revealed improvements in the bridge signifying the importance of generating a signature of bridge before and after retrofitting. The status upgradations for the upstream and the downstream trusses obtained were different due to differential levels of damage in the bridge. Also, after retrofitting, the structural elemental behavior obtained was not the same as desired.

show abstract

“…Farhey et al [4] performed diagnostic truck-load tests and microstructural analysis for structural deterioration assessment of a steel truss bridge and its rehabilitation design. Spyrakos et al [5] and Ermopoulos et al [6] conducted field measurements to develop validated analytical models to assess the capacity of the bridges to carry heavier train loads. Azizinamini [7] carried out ultimate load tests on a steel truss bridge to comprehend the behavior of old truss bridges.…”

Section: Introductionmentioning

confidence: 99%