Structural Behaviour of Pre-Cast Concrete Sandwich Panel under Axial and Lateral Loading
The sandwich panel is a layered structural system composed of a low density core material bonded to and acting integrally with, a relatively thin high strength facing materials held together by shear connectors which gives different degree of composite action. In a load bearing wall the two facin...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
1999
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10370/1/FK_1999_37_A.pdf |
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| Summary: | The sandwich panel is a layered structural system composed of a low density
core material bonded to and acting integrally with, a relatively thin high strength facing
materials held together by shear connectors which gives different degree of composite
action. In a load bearing wall the two facings act as slender columns continuously
supported by shear connectors. Core material usually act as insulation material to
reduce the temperature inside the building. The bending action due to eccentric load or
lateral load is resisted by the tensile and compressive forces developed in outer layers
while shear forces are resisted by the shear connectors. Sandwich panels are used as
exterior walls in multi-unit, residential, commercial and ware house building, providing
structurally and thermal efficient building element.
In this study, the structural behaviour of reinforced concrete sandwich wall
panels has been investigated experimentally in pre and post-cracking phase. Each panel
consists of two outer reinforced concrete layers, interconnected together by different
layout reinforced concrete ribs, which act as shear connectors. Three layouts of shear connectors have been selected for the study; these are continuous vertical concrete ribs
and truss type layout ribs inclined at 45° and 67.5° with the vertical.
Finite element method has been used in analysis for comparison with the
experimental test results in the pre-cracking phase and to determine the stress
distribution developed in the different components of the sandwich panel under
different loading conditions. Six specimens of reinforced concrete sandwich panels (two
identical specimens for each shear connector layout) each of size 1 200 x 2400 mm
(width x height) have been cast in the laboratory and tested in vertical position under
incremental vertical axial, lateral, and combined axial and lateral loading. The effect of
different shear connector layout on the overall structural behaviour of the panel is
highlighted. Moreover the composite behaviuor of the sandwich panels, the percentage
of load transferred to the ribs and the crack pattern have been investigated and
discussed. The structural response of the sandwich panel in term of deflections have
been found equal to 35 mm, 27 mm and 22 mm for panels type A, B and C respectively.
The lateral collapse load of the tested panels, have been found equal to 97 KN, 40 KN
and 45 KN for panels type A, B and C respectively.
From the results obtained in this study, it has been found that the sandwich panel
with vertical shear connector has a better overall structural response as reflected in the
integrity of the sandwich wall panel systems under the action of combined axial and
lateral loads, in comparison to sandwich panels with inclined layout shear connectors. |
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