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Experimental and finite element dynamic analysis of incrementally loaded reinforced concrete structures

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Pešić, Ninoslav, Živanović, Stana, Dennis, Jamie and Hargreaves, James (2015) Experimental and finite element dynamic analysis of incrementally loaded reinforced concrete structures. Engineering Structures, 103 . pp. 15-27. doi:10.1016/j.engstruct.2015.07.037

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Official URL: http://dx.doi.org/10.1016/j.engstruct.2015.07.037

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Abstract

This work investigates influence of damage in reinforced concrete (RC) structures on their dynamic properties through modal testing and non-linear finite element (FE) analysis. Five RC beams were designed with the fundamental flexural mode frequencies in the range of 6.5–18.0 Hz for the uncracked state. Mechanical properties of concrete, such as static and dynamic elastic moduli were determined from standard tests and ultra-sonic pulse velocity readings. The beams were incrementally loaded until the span/250 deflection limit was reached and their natural frequencies were measured from the free decay vibrations. The progressive damage reduced fundamental frequencies of tested beams by up to 25%. The non-linear FE analysis was carried out for RC beams and one two-span slab and the calculated reduced frequencies of the 1st and 2nd vibration modes were in excellent agreement with measurements. This led to the conclusion that, given that the non-linear analysis can capture degradation of dynamic stiffness due to cracking, the future dynamic performance and damage identification on the RC structure can be reliably determined from the same FE model. The results reveal potential of the combined modal testing and FE analysis to improve inspection and assessment of the in-service RC structures.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Concrete beams, Reinforced concrete -- Cracking
Journal or Publication Title: Engineering Structures
Publisher: Elsevier Science Ltd.
ISSN: 0141-0296
Official Date: 15 November 2015
Dates:
DateEvent
15 November 2015Published
9 September 2015Available
21 July 2015Accepted
11 September 2014Submitted
Volume: 103
Number of Pages: 18
Page Range: pp. 15-27
DOI: 10.1016/j.engstruct.2015.07.037
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: University of Warwick

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