SHEAR FRICTION BETWEEN BASE PLATE AND BASE MORTAR IN EXPOSED STEEL COLUMN BASE

Abstract

Shear friction between the base plate and base mortar contributes to the shear resistance of standard column bases. A value of 0.5 is adopted for the coefficient of shear friction in AIJ's design specifications, but the associated background data and theory is limited. Cyclic loading tests load and surface roughness as major parameters, twice as large as the coefficient expected for unchanged for slips that succeed the initial slip. A combined theory of adhesion and plowing, originally developed for friction between steels, is applied to interpret the friction behavior steel and mortar, indicating reasonable correlation with the corresponding test results.