Shear resistance of fractured concrete

The fractured concrete derives shear resistance from interlocking of aggregates protruding out of the fracture plane. Numerous investigations have been conducted to determine the phenomenon of aggregate interlock in structural concrete where the aggregates are usually very strong. The physical characteristic of fractured dam concrete, where the aggregate strength is substantially low, is not known clearly. The recent fracture investigation of dam concrete, performed by Briihwiler and Wittmann (1990), have shown that the crack does not travel around the aggregates; it goes straight through them. The roughness on resulting fracture plane, thus, would be mild with low shear resistance. No specific information is currently available to establish a shear resistance model. Rigorous parametric analyses are required to study the sensitivity of nonlinear seismic response of concrete dams to the,selected shear resistance model.

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