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Langenfeld, Germany

Ricker M.,Halfen GmbH | Siburg C.,RWTH Aachen | Hegger J.,RWTH Aachen
Bauingenieur | Year: 2012

The punching shear design of footings according to Eurocode 2 (DIN EN 1992-1-1) [1J, and the corresponding National Annex for Germany NA(D) [2], has changed substantially in comparison to the German norm DIN 1045-1 [3]. In addition to the generally accepted parameters for the punching shear resistance, i.e. the concrete compression strength, the flexural reinforcement ratio, and the effective static depth, the shear span ratio also affects the punching shear capacity of footings. To coincide with the mandatory transition from DIN 1045-1 to DIN EN 1992-1-1 and the corresponding National Annex for Germany NA(D), by the 1st July 2012, the following describes the design equations together with explanatory background information. Source


Siburg C.,RWTH Aachen | Hausler F.,Halfen GmbH | Hegger J.,RWTH Aachen
Bauingenieur | Year: 2012

Eurocode 2 (DIN EN 1992-1-1) in combination with the national Annex for Germany (NA(D)) will be introduced by the 1st of July 2012. From this point onwards, it will be obligatory for the design of reinforced concrete components. Compared to the present German Code DIN 1045-1, the punching shear analysis has been reorganized. Comparisons with experimental investigations and parameter studies reveal that the punching shear design defined in DIN EN 1992-1-1 does not comply the safety level required and known from DIN 1045-1. The design equations in DIN EN 1992-1-1 have been revised and readjusted in the national Annex for Germany to achieve a sufficient reliability. This paper introduces the punching shear design according to DIN EN 1992-1-1 and the national Annex for Germany as well as comments on the background of punching shear design. Source


Since 2012, Eurocode 2 and the corresponding National Annex have been introduced in Germany. Most design provisions were adopted from Model Code 1990 and provide a new design approach for ground slabs and footings. For Model Code 2010, the design concept was again revised and introduced in the Swiss standard SIA262:2013. In this paper, the design equations for the determination of the punching capacity according to Eurocode 2, the German annex to Eurocode 2, Model Code 2010, and SIA 262:2013 are presented in detail. Parameter studies are used to examine the influence of the main punching parameters (shear span depth-ratio, effective depth, longitudinal reinforcement ratio, and concrete compressive strength) on the punching shear resistance of footings. To quantify the safety level and the efficiency, the design provisions are compared to systematic test series. Copyright © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source


Several punching tests on compact footings with and without shear reinforcement were conducted at RWTH University by the Institute of Structural Concrete (IMB) and the Institute of Geotechnical Engineering (GiB). Additional nonlinear finite element analyses were performed to investigate the influence of the main parameters on the punching shear strength more in detail. After calibrating by existing punching tests on compact footings, the numerical results were in good accordance with the experimental failure loads as well as with the measured strains. As main parameters on the punching shear strength, the shear slenderness, the concrete strength, the size effect of the effective depth, and the ratio of the column perimeter to the effective depth were investigated. The numerical model revealed a change of the failure mode in dependence of the shear slenderness and confirmed the observations in tests. Additional parametric studies on footings including shear reinforcement confirmed the influence of the spacing of the stirrups on the punching strength. Source


Patent
Halfen GmbH | Date: 2013-04-12

A thermally insulating construction component for arranging between two load-bearing parts of a building includes an elongate insulating body and also reinforcing bars extending therethrough transversely with respect, to its longitudinal direction. Bearings project from side walls of the insulating body and absorb thrust and shear forces. The insulating body includes an upper and a lower parallelepipedal dimensionally stable box member filled with insulating material. The insulating body further includes a further dimensionality stable box member which is filled with an insulating material and which is arranged as a middle box member between the upper-box member and the lower box member. The middle box member is fixedly connected to the upper box member and the lower box member.

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