SHEAR STRENGTH OF HIGH STRENGTH LIGHTWEIGHT PRESTRESSED CONCRETE BEAMS

摘要

An experimental investigation was conducted to study the ultimate shear strength of high-strength lightweight reinforced and prestressed concrete beams. In this paper, only the results of the prestressed concrete members are reported. The experimental variables were the concrete compressive strength and amount of web reinforcement. Two specimens contained no web reinforcement and two specimens contained minimum web reinforcement according to the AASHTO LRFD Bridge Specifications. Measured shear capacities were compared with shear capacities calculated according to the AASHTO LRFD Bridge Specifications and ACI 318-95 Building Code. The tests have shown that the two code-based methods produced conservative estimates of shear strength for the variables studied.