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...

Related articles:

Issue 02/2015 Differences between standard and approval?

Fatigue verification of composite structural components

Load-bearing structures are subject to many load changes owing to not primarily static actions, such as traffic loads on bridges or loads caused by forklift trucks. In this case, verification against...

Issue 02/2017 Lattice girders under cyclic loading

Fatigue of semi-precast slabs

Due to the high efficiency and flexibility of semi-precast slabs with lattice girders compared to in-situ concrete structures, the use of these slab systems increase in building and industrial...

Issue 02/2017 Improved design models as against EC 2

Increase in the load-bearing capacity of shear stud assemblies

A purposefully applied supplementary reinforcement can considerably increase the load-bearing capacity of fastenings embedded in concrete under tension load (mode of failure: concrete cone failure)...

Issue 02/2019 New findings on the fatigue behavior of precast elements

Behavior of prestressed concrete girders

For prestressed precast concrete elements used in structures with predominantly cyclic loading, for example craneway girders in industrial structures or precast girders in bridge constructions, design...

Issue 02/2017 Effective width for shear

Shear capacity of RC slabs under concentrated loads

The present design rules for the shear capacity of reinforced concrete (RC) members without shear reinforcement in Eurocode 2 were calibrated based on a database containing the experimental results of...