Author
Abstract
In this paper a model for the shear capacity of rectangular reinforced
concrete beams is proposed. This modeling depends on statistical analysis for 101
experimental results from literatures, as will be indicated. These results are pure
shear results and shear resistance is predicted by concrete only (without shear
reinforcement).
The ACI approach for predicting shear strength as the sum of diagonal cracking
and 45◦ degree truss model predicts the shear strength of beams, with an average of
experimental to predicted shear strength ratio of 1.4 with a coefficient of variation
of 46.7%.
In this study, experimental pure shear test results as much as possible are revised to
study the shear behavior and then modeling it using statistical analysis, to reduce
the ratio and coefficient of variation. This model gives average ratio of 1.003 and
coefficient of variation of 20.90%.
Also in this study, all the factors effecting shear capacity are introduced with
separate modeling. These factors are, concrete compression strength (fc'), beam
width (b), size of aggregate (da), shear span to depth ratio (a/d), and percentage of
longitudinal reinforcement.
Then assembly model for shear strength containing all these factors is presented
and compared with experimental results.
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