BOND SHEAR MODULUS OF REINFORCED-CONCRETE AT HIGH-TEMPERATURES

The effect of fire and high temperature on the behavior and properties of concrete has drawn considerable attention. In this work an experim ental program is used to determine the effect of high temperature on t he interfacial bond shear modulus between concrete and reinforcement. Steer bars of different diameters were embedded in concrete cylinders for a depth less than that required for total development to assure fa ilure by loss of bond. Specimens were then kept in an oven for differe nt time durations and different temperatures. Specimens were then cool ed by either keeping cylinders at room temperature or immersing them i n water. The pull-out test was applied, and loads and displacements we re recorded. Results from the pull-out test were then used along with an analytical model to calculate the bond shear modulus. The analytica l model is based on the physical representation of the pull-out test, assuming linear elastic behavior of both steel and concrete. Copyright (C) 1996 Elsevier Science Ltd