Abstract
Synopsis The phenomena of hyperstrength and snap-back in lightly reinforced concrete beams are interpreted according to the concepts fracture mechanics. The tensile strength and toughness of concrete, usually disregarded, are so high in some cases that the maximum bending moment overcomes the bending moment of limit design (hyperstrength). The drop in load capacity hides a virtual sofiening load-deflection branch with positive slope (snap-back), which can be detected if the loading process is controlled through the crack width.
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