Reliability of reinforced concrete shear resistance

[摘要] ENGLISH ABSTRACT:The lack of a simple rational mechanical model for the shear resistance behaviour of structural concretemembers results in the use of simplified empirical methods in codified shear design methods with alimited range of applicability. This may lead on the one hand to insufficient reliability for members onthe boundary of the range of applicability and on the other hand to over-conservative designs.Comparison of the provision for shear resistance design of the South African code of practice for thedesign of concrete structures SANS 10100: 2003 with other related codes shows differences in thedesign variables taken into account and procedures specified to calculate shear resistance.The thesis describes a systematic evaluation of the reliability performance of the shear performance ofreinforced concrete sections subjected to shear only, and in combination with flexural moments,designed with SANS 10100: 2003. Both sections with and without provision for shear reinforcementare considered. A representative range of parametric conditions are considered in the evaluation.Punching shear is not considered in the present review.Shear design as specified by SANS 10100 is compared to the provisions of the closely related Britishcode for the structural use of concrete BS 8110, Eurocode 2 for the design of concrete structures EN1992 and the American bridge design code AASHTO LRFD.The reliability performance of the shear design method for beams of SANS is considered in terms of aprobabilistic shear resistance model, uncertainties in the basic variables such as material properties,geometry and modelling uncertainty. Modelling uncertainty is determined by comparing predictedvalues with published experimental results.Keywords: structural concrete; shear resistance; shear design; reliability; design codes; codecompanson

[发布机构] Stellenbosch University