RELIABILITY-BASED ANALYSIS OF COMPOSITE SOLID SLENDER TIMBER COLUMNS WITH ALUMINIUM LAMINATES USING SELECTED NIGERIAN TIMBER SPECIES
RELIABILITY-BASED ANALYSIS OF COMPOSITE SOLID SLENDER TIMBER COLUMNS WITH ALUMINIUM LAMINATES USING SELECTED NIGERIAN TIMBER SPECIES
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Date
2018-03
Authors
MANGUT, Samuel Nagu-Num
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Abstract
Four timber species (Strombosia pustulata, Macrocarpa biquertii, Entandrophragma
cylindricum and Nauclea diderichii) were laminated with aluminium sheets of varying
thicknesses.Axial and flexural loads were applied to the composite columns to determine
their behaviour under such loadings. Finite element analysis was carried out in Abaqus/CAE
6.10 (2010) and the reliability analysis was carried out using the First Order Reliability
Analysis (FORM) in MATLAB (2007) on the laminated timber columns. The results for
finite element analysis show the effect of the thickness of Aluminium laminates on the
strength capacity of timber columns whereby deflection reduced from 3.28×10-2
mm for
timber column without laminate to 2.96×10-2mm with the introduction of 20mm aluminium
laminate in the x-axis. Similarly, the deflection reduced from 5.18×10-2mm to 1.18×10-2
mm
in the y-axis, and 5.45mm to 1.093mm in the z-axis for the timber (Strombosia pustulata
specie) column that is fixed-free end restraint condition. For the reliability analysis, bending,
buckling and flexural buckling failure modes were considered. The results for compression
mode of failure show that the column is safewith safety index values of 4.3 and 9.68 for load
parameters and dead-to-live load parameters respectively without laminates. The study
shows that the most critical failure mode for the column is flexural buckling and hence isnot
safe for imposed loads that are greater than 20kN but made safe with the use of aluminium
laminate of 8mm.
Description
A THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES,
AHMADU BELLO UNIVERSITY, ZARIA, IN PARTIAL FULFILLMENT FOR THE
AWARD OF MASTER OF SCIENCE IN CIVIL ENGINEERING
DEPARTMENT OF CIVIL ENGINEERING
FACULTY OF ENGINEERING
AHMADU BELLO UNIVERSITY,
ZARIA, NIGERIA
Keywords
RELIABILITY-BASED ANALYSIS ,, COMPOSITE SOLID SLENDER TIMBER COLUMNS,, ALUMINIUM LAMINATES,, SELECTED NIGERIAN TIMBER SPECIES