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Description: Learn about the model building code requirements for verification of the compressive strength of masonry, and find out why the compressive strength of masonry is often much greater than the compressive strength of masonry mortar. Examines how materials, workmanship, and testing procedures affect prism test results for compressive strength of masonry.
Compressive strength of masonry is an important performance characteristic used by engineers in the design of masonry structures. Defined as the maximum compressive force resisted per unit of net cross-sectional area of masonry, the compressive strength of masonry must equal or exceed the specified compressive strength of masonry, f'm, used in the structural design. Building codes limit allowable stresses in masonry to a percentage of f'm. According to ACI530.1/ASCE 6/TMS 602, two methods may be used to verify that the compressive strength of masonry equals or exceeds f'm: the unit strength method and the prism test method. The Uniform Building Code also provides for verification of the compressive strength of masonry using on these two methods. In addition, the Uniform Building Code allows acceptance based on a record of masonry prism tests representative of corresponding construction. This publication explains the methods for verifying compressive strength of masonry and examines the factors that determine the compressive strength of masonry.
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