Abstract:
SNiP code is widely used in the so-called post-soviet union or commonwealth of
independent states (CIS) countries for the structural designs of reinforced and
prestressed concrete structures, and this study aims to present modification factors
of the existing shear design equation for the concrete contribution specified in
SNiP code. The existing shear strength estimation model specified in SNiP code
was initially developed about 90 years ago based on a semi-empirical approach,
which means its accuracy and margin of safety level depends significantly on the
shear test results available at that time. In this study, a rational modification factor
is derived to improve the accuracy of the shear design equation in SNiP code using
a current up-to-date large shear database, and the key influencing factors of the
shear resistance of beam members, such as the longitudinal reinforcement ratio and
presttressing effect, were addressed. To verify the accuracy and safety level of the
proposed models, detailed verifications are introduced with comparisons to the
other design models used in the international building codes.