Zum Querkraftwiderstand bei Leichtbetonbalken ohne Querkraftbewehrung

Shear Strength of Lightweight Concrete without Shear Reinforcement

This paper presents results of shear beam tests with lightweight concrete and without shear reinforcement exhibiting a distinct post peak behavior. The shear test results raise the question whether the shear design in DIN 1045-1 can also cover very brittle concrete types as ALWAC (All Lightweight Aggregate Concrete) with a sufficient safety level. The size effect in shear beams is discussed.
A model for the load bearing behavior after formation of the inclined crack based on the kinematics of a set of rigid bodies is developed. A consideration of the additional load capacity in the post peak range in design formulas is not recommended.