DE
EN

SUBMITTED BY/EINGEREICHT VON: HALFEN GMBH

Innovation: HDB “Swan” punching shear reinforcement for foundations

Figure: Halfen/RWTH Aachen

HDB “Swan” punching shear reinforcement

Figure: Halfen/RWTH Aachen

Due to the less slender design of foundations compared to flat floors and the soil contact stress acting on the former, footings exhibit a load transfer pattern that enables greater punching shear strength as a result of the steeper inclination of struts. However, the associated steeper shear cracks make vertical punching shear reinforcing elements less efficient than in flat floors, which is why inclined reinforcing elements appear to be more appropriate for use in foundations. Thus, an innovative punching shear reinforcing element with inclined bars was designed for pad foundations and...

Related articles:

Issue 02/2017 Flat slabs and foundations

New punching shear reinforcement systems

The structural design of flat slab systems is usually governed by the punching shear resistance of the slab. To achieve a sufficient punching shear resistance at reasonable slab thickness, shear...

more

Issue 09/2019 HALFEN

Innovative punching shear reinforcement for foundations

The larger the buildings, the higher the shear forces that act at points on reinforced-concrete slabs. To prevent punching of columns through concrete slabs, punching shear reinforcement, commonly in...

more

Issue 02/2019 New experimental results on punching shear behavior of flat slabs with varying amount of punching shear reinforcement

Reduction of punching shear reinforcement

With introduction of Eurocode 2 in Germany, the punching shear design provisions for flat slabs were revised. In consequence of limited anchorage conditions of punching shear reinforcement elements in...

more

Issue 02/2021

Punching shear reinforcement in crosswise arrangement – Effective or impermissible?

Stud rails used as punching shear reinforcement in flat slabs are arranged radially in Germany. A crosswise arrangement in the layout of the reinforcement elements, as it is common practice in North...

more

Issue 08/2016 Betomax

Punching shear and bonded reinforcement system

Flat slabs and/or element floors (precast slabs with in-situ structural concrete topping) as used in industrial and commercial buildings are state-of-the-art and allow great freedom in plan design....

more