Zur Bemessung von Scher‐/Lochleibungsverbindungen mit Blindnieten im Stahlbau

Self Cite

Wherever joints in metal lightweight construction are only accessible from one side, joining techniques such as screwing or welding are uneconomic or inapplicable, blind fasteners and especially blind rivets as the most common type are the means of choice. Nevertheless, with the use of blind rivets, problems arise for the structural engineer, because of the lack of proper design rules according to the Eurocode 3. With the research affords of the authors this deficiency was eliminated for the field of normal strength steel in the past. However, with the increasing usage of high‐strength steels in such constructions, new problems emerge and the developed design rules are not valid yet. This paper presents results from quasi‐static tests on blind rivet joints with different steel grades of the components to extend the proposed design rules. Different effects were identified, which lead to a reduced shear resistance of the blind rivets. At the same time the results point out the benefits of high‐strength steels on the load‐bearing behaviour. Furthermore, results from fatigue tests on blind rivet joints are presented. These show a notable influence of the steel grade on the fatigue resistance of the joint as well as the potential for the design of such joints.

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extension of the application limits of blind fasteners for joining high‐strength steels in metal lightweight construction

Kalkowsky¹,

Glienke²,

Blunk³

et al. 2021

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“…These areas are currently only covered by technical approvals of the building authorities DIBt. In further research work, however, an initial design proposal for these areas has already been developed [24]. For single lap shear joint with t = t1 or t < t1 < 2.5 t:…”

Section: Discussionmentioning

confidence: 99%

Experimental investigations on the design and execution of shear loaded blind rivet joints in steel lightweight construction

Kalkowsky¹,

Glienke²,

Blunk³

et al. 2021

Self Cite

There is a barely manageable variety of blind rivets available on the market. This is because there is no universal product standard, which establishes the mechanical properties of blind rivets in a suitable manner. Whenever structural engineers dimension joints with blind rivets, they face a major challenge due to the lack of design values for the blind rivets themselves and the impractical application limits according to EN 1993‐1‐3. It is therefore necessary to determinate the design values of the blind rivets itself and for their applications in the field of steel lightweight construction in time and cost‐intensive experimental investigation. Furthermore, the regulations according to the ECCS, which allow the experimental‐based determination of design values for such applications, are insufficient, as they do not consider alternating stresses as well as compact joint dimensions. To close the gap of knowledge this paper presents results from systematic investigations on the shear and load‐bearing behavior of blind rivets and joints with blind rivets. Based on the investigations the authors suggest the extension of the current design and execution rules in order to allow a safe design by separate verification of the components and blind rivet.

Remaining Fatigue Strength of an Orthotropic Steel Deck with Respect to a Repair Method by Cold Joining Techniques

Kalkowsky,

Schröder,

Blunk

et al. 2024

The increased traffic loads of the last decades led to an overload of the existing infrastructure. Especially for orthotropic steel decks of bridges, which are prone to fatigue fractures, this have led to structural damages of different categories. With respect to category 2 damages and their retrofit, this paper presents results of fatigue tests on the nonwelded constructional details of an old, demolished orthotropic steel deck. The samples were extracted from a highway bridge with an orthotropic steel deck built in Germany in the 1970s. In comparative fatigue tests on identical constructional details made of new material with the same steel grade, the remaining fatigue strength was determined. Based on the problem of manganese sulfides in old steels the potential of the repair method by cold joining techniques was emphasized. Characteristic load‐bearing capacities for a Eurocode 3‐compliant design of a structural blind fastener were determined and their use in a pilot project was reported.