AbstractThe dynamic response of unreinforced concrete structures is studied taking account of initiation, extension, closing and reopening of so‐called discrete cracks. The computational procedure is based on the finite‐element method and is at present restricted to two‐dimensional situations. The discrete cracks are simulated by separation of originally adjacent finite elements. An equivalent tensile‐strength criterion is used for the initiation and extension of the cracks which are assumed to propagate perpendicularly to the principal tensile stress. If this direction does not coincide with the interelement boundaries of the finite‐element mesh, the latter is automatically altered. Between elements being separated by a crack special ‘crack elements’ are introduced, which take account of the stress transfer by aggregate interlock. The equations of motion are integrated numerically using an explicit formulation. The procedures outlined are demonstrated on a simplified cross‐section of a concrete gravity dam subjected to horizontal earthq
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