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Article: Capturing the long-term dynamic properties of concrete cable-stayed bridges

TitleCapturing the long-term dynamic properties of concrete cable-stayed bridges
Authors
Issue Date2013
PublisherScience Direct. The Journal's web site is located at http://www.elsevier.com/locate/engstruct
Citation
Engineering Structures, 2013, v. 57, p. 502-511 How to Cite?
AbstractA cable-stayed bridge can be analysed by finite element method with the bridge deck and pylons modelled as beam elements taking into account geometric nonlinearities, and the stay cables as truss elements with equivalent Ernst moduli to account for cable sag. The long-term dynamic properties of concrete cable-stayed bridges are governed by the time-dependent material behaviour, including ageing, creep and shrinkage of concrete, and steel relaxation. A design code can be regarded as a summary of experience and local material properties of a certain country or geographical location. Results of analyses using five design codes show that, although different codes give different long-term material properties, the trend of long-term dynamic characteristics is largely independent of the code adopted. An empirical formula with undetermined coefficients is hence proposed to model the long-term development of structural frequencies, which will be useful to engineers conducting structural health monitoring of concrete cable-stayed bridges irrespective of the geographical locations. Moreover, an experiment has been conducted to monitor the long-term development of dynamic properties of post-tensioned concrete beams for verification. The combined effects of time-dependent behaviour and structural damage on the structural frequencies are also investigated.
Persistent Identifierhttp://hdl.handle.net/10722/202698
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSI, Xen_US
dc.contributor.authorAu, FTKen_US
dc.contributor.authorLI, Zen_US
dc.date.accessioned2014-09-19T09:14:18Z-
dc.date.available2014-09-19T09:14:18Z-
dc.date.issued2013en_US
dc.identifier.citationEngineering Structures, 2013, v. 57, p. 502-511en_US
dc.identifier.urihttp://hdl.handle.net/10722/202698-
dc.description.abstractA cable-stayed bridge can be analysed by finite element method with the bridge deck and pylons modelled as beam elements taking into account geometric nonlinearities, and the stay cables as truss elements with equivalent Ernst moduli to account for cable sag. The long-term dynamic properties of concrete cable-stayed bridges are governed by the time-dependent material behaviour, including ageing, creep and shrinkage of concrete, and steel relaxation. A design code can be regarded as a summary of experience and local material properties of a certain country or geographical location. Results of analyses using five design codes show that, although different codes give different long-term material properties, the trend of long-term dynamic characteristics is largely independent of the code adopted. An empirical formula with undetermined coefficients is hence proposed to model the long-term development of structural frequencies, which will be useful to engineers conducting structural health monitoring of concrete cable-stayed bridges irrespective of the geographical locations. Moreover, an experiment has been conducted to monitor the long-term development of dynamic properties of post-tensioned concrete beams for verification. The combined effects of time-dependent behaviour and structural damage on the structural frequencies are also investigated.en_US
dc.languageengen_US
dc.publisherScience Direct. The Journal's web site is located at http://www.elsevier.com/locate/engstructen_US
dc.relation.ispartofEngineering Structuresen_US
dc.titleCapturing the long-term dynamic properties of concrete cable-stayed bridgesen_US
dc.typeArticleen_US
dc.identifier.emailAu, FTK: francis.au@hku.hken_US
dc.identifier.authorityAu, FTK=rp00083en_US
dc.identifier.doi10.1016/j.engstruct.2013.10.007en_US
dc.identifier.hkuros237587en_US
dc.identifier.volume57en_US
dc.identifier.spage502en_US
dc.identifier.epage511en_US
dc.identifier.isiWOS:000330488800045-
dc.publisher.placeNew Yorken_US

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