Teilsicherheitsbeiwerte für bestehende Stahlbetonbauwerke

Partial safety factors for reinforced concrete structures - verification of the shear capacity

General probabilistic methods for reliability evaluation allow the consideration of uncertainties in planning, design, execution and maintenance of new and historic reinforced concrete structures. The implementation of the probabilistic method used for the reliability evaluation of existing structures which is allowed according to the standards is in very limited use and requires some modifications.
A greater acceptance of the probabilistic methods could be reached through some simplified procedures for determining the reliability or the systematic specification of the stochastic models of the essential properties (e.g. properties of materials, of loadmodels, etc.).
Especially for the engineering practice a method for adapting the partial safety factors of the semi - probabilistic calculation method would be very useful.

The aim of this paper is to present and discuss a method to adjust the partial safety factors due to collected stochastic models of the properties of historic and new structures and a possible reduction of the reliability level. The method is demonstrated on a representative three - span plate structure of the Austrian Federal Railways.