Sandwich action in foam filled masonry cavity walls

White, K.A., 1998. Sandwich action in foam filled masonry cavity walls. PhD, Nottingham Trent University.

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The objective of this project is to introduce an analysis methodology and evaluation of the flexural behaviour of masonry cavity walls treated with Isofoam Cavity Reinforcement Foam (CRF). Current masonry codes and practices do not consider composite action in masonry. As a prelude to analysing foam filled masonry cavity walls, the behaviour of plywood faced sandwich panels was modelled. Classical solutions for 'sandwich' behaviour and experimental data have been used to validate the application of finite element analysis (F.E.A) methods. The theoretical solutions have been supported by a thorough investigation of current material property evaluation methods.

Orthotropic properties of Isofoam CRF were identified as significant during uniaxial compression tests. The uniaxial compression tests were initially used to evaluate the elastic response of the Isofoam. The testing was supported by an F.E.A. study which identified experimental errors and formulated correction factors. Uniaxial tension test results aided in the formulation of these factors. F.E.A. was used to examine experimental errors arising from the test configurations and apparatus for the American and British Standard shear modulus tests. The use of control tests also identified errors inherent to the particular test equipment. A further shear modulus evaluation method used the load / displacement response of a sandwich beam at different span lengths. A ranking list has been composed to indicate the most appropriate property test method for polyurethane foamed cores. F.E.A. and experimental data showed that the length of span influenced by local bending of the facings, at load concentrations, was half that described by classical solutions.

Linear elastic F.E.A., of vertically spanning, single storey height, foam filled masonry cavity walls, utilised material properties derived from separate brick and mortar tests and representative flexural tests of masonry. For a 32 Kg/m3 density foam F.E.A. predicted an increase in stiffiiess of 19, 28 and 30% according to cavity width. An F.E.A. parametric study of the efficiency of a foam filled cavity wall showed that an increase in foam density enhances this remedial system. The project concludes that the foam injection system is a valid method for short term stiffening of masonry cavity walls subject to lateral loading. The long term behaviour of the structural interaction between Isofoam CRF and masonry should be investigated further.

Item Type: Thesis
Creators: White, K.A.
Date: 1998
ISBN: 9781369323276
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 01 Oct 2020 15:51
Last Modified: 27 Sep 2023 09:41

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