It is widely recognized that the designer must ensure the ductility for reinforced concrete members by avoiding brittle failure such as shear and bond-splitting, particularly in the earthquake-resistant design of structures. This would be realized on the premise that the manners to assess the ultimate strength at the respective modes of failure were properly established.
The strength equations proposed to date are examined quantitatively by using the available experimental data set forth by several investigators, and the most effective equations to bunch the scatterings of the data to the values calculated with themselves are evaluated with distinction of the loading processes, monotonic and cyclic, in the respective modes of failure.
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