Modal properties of beam-and-block pre-cast floors
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. ISSN 1937-3260Full text not available from this repository.
Official URL: http://dx.doi.org/10.1080/19373260802155894
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|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TH Building construction
|Divisions:||Faculty of Science > 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.|
|Page Range:||pp. 171-185|
|Access rights to Published version:||Restricted or Subscription Access|
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