RELIABILITY BASED CALIBRATION OF PARTIAL SAFETY FACTOR ON CHARACTERISTICS STRENGTH OF STEEL REINFORCEMENT BARS
RELIABILITY BASED CALIBRATION OF PARTIAL SAFETY FACTOR ON CHARACTERISTICS STRENGTH OF STEEL REINFORCEMENT BARS
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Date
2021-02
Authors
MOHAMMED, Abdulmumin Nda
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Abstract
In the calibration of partial safety factor of steel reinforcement bars conducted in this study,
necessary parameters (i.e. steel diameter, area, yield strength, ultimate strength, and elongation)
needed for the calibration were obtained from the steel testing laboratory, Department of Civil
Engineering, Ahmadu Bello University Zaria. The test results were analyzed in accordance with
Eurocode, JSCC and ISO standards with the aid of Microsoft Excel, SPSS, EasyFit and
COMREL software packages. The steel reinforcement parameters were checked for outliers and
the PDF of the steel reinforcement parameters were analyzed using the Kolmogorov-Smirnov
goodness of fit test. The result from the analysis showed that the probability density function of
the steel reinforcement bars diameter follows a Log-Normal distribution, the yield strength and
ultimate yield strength fits a Gumbel(Min) and Gumbel(Max) distribution respectively. Also, the
calibrated design values of the steel reinforcement bar diameter, yield and ultimate strength are
2.167 (8.7mm), 398.33N/mm2, 842.7N/mm2 respectively with a reliability index value of 3.805
and probability of failure of 7.08E-5 which yielded a partial safety factor 1.07(0.93) with a
characteristics value of approximately 426N/mm2. Hence, it was recommended that the
characteristic strength of the steel reinforcement bars should be set to 426N/mm2 with a safety
factor of 0.93(1.07).
Description
A THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES,
AHMADU BELLO UNIVERSITY, ZARIA
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD
OF MASTER DEGREE IN CIVIL ENGINEERING
Title page
DEPARTMENT OF CIVIL ENGINEERING,
FACULTY OF ENGINEERING,
AHMADU BELLO UNIVERSITY,
ZARIA, NIGERIA
Keywords
RELIABILITY,, CALIBRATION,, PARTIAL SAFETY,, CHARACTERISTICS STRENGTH,, STEEL REINFORCEMENT BARS.