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A vibration based method to update axial shortening of load bearing elements

Moragaspitiya, H.N.P., Thambiratnam, D.P., Perera, N., & Chan, T.H.T. (2010) A vibration based method to update axial shortening of load bearing elements. In The 5th Civil Engineering Conference in the Asian Region and Australasian Structural Engineering Conference, 8-12 August 2010, Sydney Convention and Exhibition Centre, Sydney.

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    Abstract

    Axial shortening in vertical load bearing elements of reinforced concrete high-rise buildings is caused by the time dependent effects of shrinkage, creep and elastic shortening of concrete under loads. Such phenomenon has to be predicted at design stage and then updated during and after construction of the buildings in order to provide mitigation against the adverse effects of differential axial shortening among the elements. Existing measuring methods for updating previous predictions of axial shortening pose problems. With this in mind, a innovative procedure with a vibration based parameter called axial shortening index is proposed to update axial shortening of vertical elements based on variations in vibration characteristics of the buildings. This paper presents the development of the procedure and illustrates it through a numerical example of an unsymmetrical high-rise building with two outrigger and belt systems. Results indicate that the method has the capability to capture influence of different tributary areas, shear walls of outrigger and belt systems as well as the geometric complexity of the building.

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    ID Code: 34142
    Item Type: Conference Paper
    Keywords: Axial shorterning, modal parameters, modal flexibility, time dependent parameters of concrete
    Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Structural Engineering (090506)
    Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
    Past > Schools > School of Urban Development
    Copyright Owner: Copyright 2010 Please consult the authors.
    Deposited On: 17 Aug 2010 12:12
    Last Modified: 01 Mar 2012 00:31

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