Shear Strengthy of Two-Span Continuous Reinforced Concretet Beams wit Multiple Point Loading
Robert H. Bryant, Albert C. Bianchini, Jose J. Rodriguez and Clyde E. Kesler
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Presents results of tests on 2 1 rectangular, two-span continuous reinforced concrete beams with more than two concentrated loads per span. Series I studied the accuracy of web reinforcement designed by ACI 318-56. Series II studied behavior and mode of failure with low precentages of web reinforcement. Variables included type of loading, cutoff or extension of longitudinal reinforcing, and percentage and spacing of web reinforcement. Behavior of the beams before and after first diagonal tension cracking and at failure is described. Beams with web reinforcing according to ACI 318-56 failed in flexure. Some signs of crushing of the concrete were seen at all center supports. Five beams of Series II failed in flexure; four, with lower percentages of web reinforcing, had shear compression or splitting bond failures. Beams without web reinforcement failed in some fashion other than flexure and the failure zone was unpredictable.