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Title: Behavior of Normal and High-Strength Concrete Under Combined Compression-Shear Loading

Author(s): Ali R. Khaloo and Shuaib H. Ahmad

Publication: Materials Journal

Volume: 85

Issue: 6

Appears on pages(s): 551-559

Keywords: compression; compressive strength; concretes; octahedral stress; high-strength concretes; shear properties; shear stress; strength; stresses; stress-strain relationships; tau; Materials Research

DOI: 10.14359/2324

Date: 11/1/1988

Abstract:
Eighty solid cylindrical 3 x 9 in. (76.2 x 152.4 mm) specimens using normal and high-strength concretes were tested under uniaxial compression, shear shear-compression, and compression-shear loadings to determine strength and behavior of concrete under these loading paths. The effects of stress-path on the behavior of concrete under combined compression shear were studied. For shear-compression loading, the effect of shear on the compressive stress-strain curves was to reduce the peak stress and to increase the strain corresponding to peak stress as the magnitude of applied shear increased. Comparison of results of high-strength concretes to those of normal strength concretes show that for the same magnitude of compressive fraction c, higher strength concretes fail at lower values of c. Also, the higher strength concretes withstand lesser shear deformation before the occurrence of the first surface shear crack. Based on the comparison of results of previous studies on hollow cylinders to the results of the present study on solid cylinders, it is suggested that for pure shear and combined compression-shear loading, the ratio of ç'max,h / ç'max,s, is essentially unity. The experimental results for compression-shear loading are compared with a strength criterion based on all three stress invariants and the comparison is judged good.


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