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Concrete-to-concrete interfacial joints in structural components

Subsequent strengthening by concrete overlays

According to DIN EN 1992-2/NA, the adhesion component of theshear resistance in a concrete-concreteinterface has not to be applied under fatigue or dynamic loading (c = 0). In structures subject to fatigue loading, this results in a relatively high calculated reinforcement ratio, thus leading to a large number of drill holes for shear connectors, particularly in the case of subsequent strengthening by concrete overlays. Consequently, both cost and effort will increase significantly.

Hilti has been involved in developing an alternative design model for fatigue strength in the interface, which...

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