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An Investigation of the Unit Shear Strength of Geometrically Scaled Reinforced Concrete Beams

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By Matthew Murray1, Santiago Pujol1

Purdue University

This study examines the influence of beam size on the shear capacity of geometrically scaled reinforced concrete beams without web reinforcement.

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Version 1.0 - published on 18 Sep 2017 doi:10.4231/R7BK19HF - cite this Archived on 19 Oct 2017

Licensed under Attribution-NonCommercial-ShareAlike 3.0 Unported

Beam-Profile.jpg LB-Cross-Section.png SB-Cross-Section.png


The experimental program included six 12-in. deep beams and two 30-in. deep beams. All components of the large beams were geometrically scaled to have 2.5 times the dimensions of the small beams. The scaling included bar cover, bar spacing, and maximum aggregate size, as well as the overall beam span, width, and depth. Additionally, four of the small beams were cast using aggregate that had not been scaled to study the influence of aggregate size on the unit shear strength of beams of equal size. The specimens, each having a shear span to effective depth ratio of 2.3, were tested to failure under a concentrated load at midspan. The experimental results indicated that when all beam components were geometrically scaled in proportion to depth, beams of different sizes developed similar unit shear strengths, within 20% of one another. The ratio of aggregate size to beam size influenced unit shear strength to the extent that 12-in. deep beams containing 1-in. maximum aggregate size exhibited a unit shear strength that was 35% greater than the unit strength of specimens containing 1/2-in. aggregate.

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This dataset was compiled on 2015-02-27 by C. Sim and originally created in the datacenterhub. Its original location is at This dataset was imported to PURR for preservation and long-term access in summer 2017.

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