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Modal properties of beam-and-block pre-cast floors
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Pavić, Aleksandar, Miskovic, Z. and Živanović, Stana (2008) Modal properties of beam-and-block pre-cast floors. The IES Journal Part A: Civil & Structural Engineering, Vol.1 (No.3). pp. 171-185. doi:10.1080/19373260802155894 ISSN 1937-3260.
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Official URL: http://dx.doi.org/10.1080/19373260802155894
Abstract
This article describes a combined experimental and analytical approach to investigating modal properties of beam and block (B&B) building floors. A rarely performed dynamic testing of a representative sample of four nominally identical B&B open plan suspended ground floors in a real-life building has been carried out using state-of-the-art modal testing featuring a pair of simultaneously operating electrodynamic shakers and multi-channel data acquisition. The testing demonstrated that the floors have considerable transverse stiffness able to engage sizeable parts of the floor area in a manner similar to orthotropic plates. Although nominally identical, the four floors have somewhat different modal properties. In general, although open plan, the B&B floors tested developed considerable levels of non-proportional damping. This is possibly a consequence of friction between non-monolithic floor elements (in the beam-to-block and/or block-to-block contacts). By back analysis, using experimentally measured static stiffness and modal properties, a simple mathematical model of a rectangular simply supported orthotropic plate was verified as an applicable method for the calculation of modal properties of B&B floors tested. However, somewhat surprisingly, for this method to work, it was necessary to assume approximately 2.5 times higher bending stiffness than that of just the beams in the B&B floors, which are the only structural elements in this type of construction. Transverse stiffness was estimated to be 8% of this enhanced main stiffness. This is probably due to composite action of the in situ cast non-structural sand and cement screed and/or engaged friction stiffness between non-monolithically connected beams and blocks.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Library of Congress Subject Headings (LCSH): | Floors, Modal analysis, Precast concrete construction -- Mathematical models | ||||
Journal or Publication Title: | The IES Journal Part A: Civil & Structural Engineering | ||||
Publisher: | Taylor & Francis Ltd. | ||||
ISSN: | 1937-3260 | ||||
Official Date: | January 2008 | ||||
Dates: |
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Volume: | Vol.1 | ||||
Number: | No.3 | ||||
Page Range: | pp. 171-185 | ||||
DOI: | 10.1080/19373260802155894 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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