Title: Cracking Resistance of Concrete Members in Bending
Author(s): F. Bljuger
Publication: Journal Proceedings
Appears on pages(s): 467-474
Keywords: beams (supports); bending; cracking (fracturing); deflection; limit design method; precast concrete; reinforced concrete; serviceability; structural analysis; thickness.
Evaluation of the cracking resistance of concrete members is necessary to estimate serviceability and to determine the ultimate limit state of unreinforced structures in bending. The flexural tensile strength of concrete is analyzed in the context of different codes, and the relevant Comitk Euro-International du BPton (CEB) recommendation is verified in special experiments. The influence of section geometry on the cracking moment is considered, and the width of the flange in tension is found not to exceed three flange thicknesses on each side of the web. The influence of member length on the cracking resistance is determined through probabilistic analysis of suitable test data, and a convenient factor for conversion from a short member to an extended one is recommended. The proposed approach should prove useful in the design of various bending structures.