PROGRAM FOR ONE-WAY REINFORCED CONCRETE SLABS TO BS8110 (1985)
PROGRAM FOR ONE-WAY REINFORCED CONCRETE SLABS TO BS8110 (1985)
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Date
1999-08
Authors
IDRIS, ABUBAKAR
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Abstract
The BS8110 (1985) is the revised version of CP110 (1972) and is
used for the design of reinforced concrete elements. In order
to maintain safe designs, partial safety factors are applied to
material properties as well as the loadings on the structure.
Studies have shown that these factors result in high investment
and inconsistensy in the safety level for varying design
parameters and practical uncertainties.
The work in this thesis provides FORTRAN-77 modules for the
design of one way slabs at uniform reliability level using the
first-order reliability method. Based on the results obtained
from the program, plots of reinforcement ratio versus load
ratio and reinforcement ratio versus effective depth for each
set of design input parameters are provided. It is shown for
uniformity in reliability level, there must be a linear
relationship between the reinforcement ratio and effective
depth. However, a non linear relationship exists between the
reinforcement ratio and the ratio of dead to live load.
Equations showing these effects are also developed and can be
used directly for safe designs. Within the requirements of
BS8110 for one-way slabs and practical uncertainties, the
results of this study show that calculation and processing time
is greatly reduced. Also, safety of the designed element is
known a priori and problems of over -and /or -under designs are
eliminated with a trade-off between safety and economy.
Summarily, the design of one way slabs at uniform reliability
level can be carried out using one of the following: (1) the
computer program; (2) the plots presented or (3) the use of the
equations determined.
Description
BEING A PROJECT THESIS SUBMITTED TO THE
POSTGRADUATE SCHOOL IN PARTIAL
FULFILLMENT FOR THE AWARD OF
M.Sc. (ENG.) STRUCTURES
Department of Civil Engineering
Ahmadu Bello University,
August 1 999.
Keywords
PROGRAM,, ONE,, REINFORCED,, CONCRETE,, SLABS,