Tragverhalten von CoSFB-Dübeln

in Stahlbau (2019), 88(2019)(Heft 7),

Slim-floor or shallow floor construction is characterized by the integration of a steel beam into a slab. The activation of a composite action between the steel section and the concrete slab leads to a ... [more ▼]

Slim-floor or shallow floor construction is characterized by the integration of a steel beam into a slab. The activation of a composite action between the steel section and the concrete slab leads to a significant increase of the bending capacity and the stiffness of the beam, allowing for larger beam spans. This paper presents a fundamentally new method for assessing the load-bearing capacity of CoSFB-Dowels, which ensures a composite action of a composite slim-floor beam (CoSFB). Based on detailed analysis of push-out tests, extensive numerical simulations were performed in order to identify the contribution of various parameters on the load-bearing capacity. Finally, an analytical formulation of the load-bearing capacity is presented, which has been derived by applying a simple second order plasticity approach. [less ▲]

Effective bending stiffness of heavy steel-concrete composite columns with multiple encased steel profiles

in Proceedings of 9th International Conference on Steel and Aluminium Structures (ICSAS19) (2019)

A new method to assess the stiffness and rotation capacity of composite joints

in Proceedings of the 12th International Conference on Advances in Steel-Concrete Composite Structures. ASCCS 2018 (2018)

Composite beam-to-column joints in buildings are mostly modelled as pinned joints in order to facilitate the design of the structure. In reality, due to the required reinforcement in the concrete slab, a ... [more ▼]

Composite beam-to-column joints in buildings are mostly modelled as pinned joints in order to facilitate the design of the structure. In reality, due to the required reinforcement in the concrete slab, a certain joint rigidity and bending resistance is always available. The real joint behaviour corresponds therefore more to that of a semi-continuous joint. This is not only beneficial for the serviceability limit state but can also be advantageous at ultimate limit state. However, due to the lack of analytical design rules in EN 1994 to verify the rotation capacity of semi-continuous joints, these are commonly modelled as pinned joints, which impedes an efficient design of composite structures. In this context, a research program on the behaviour of composite joints, focusing on the ultimate rotation capacity, was initiated at the University of Luxembourg [1]. The aim was to identify the influence of two major joint components – the reinforced concrete slab and the steelwork connection – on the moment-rotation curves of composite joints under hogging bending moment. An experimental campaign comprising 8 tests on beam-tocolumn joints was conducted to determine the response of composite joints with variable reinforcement ratio and diameter of reinforcing bars. In addition to the experimental part, an FE model was developed with the software ABAQUS aiming to simulate the behaviour of internal beam-to-column composite joints. In this paper, the 3D finite element model and results of analyses are presented. The FE model has been defined by 3D solid elements with realistic contact definitions and nonlinear material laws. The results of the numerical simulations presented a good agreement with the experimental data. Based on the experimental and numerical investigations, the influence of reinforcement and steelwork connection on the structural properties of composite joints is derived. A new analytical method to determine the stiffness and rotation capacity of composite joints is proposed. The accuracy of this new method is confirmed by existing experimental and numerical results. [less ▲]

Push out test of novel deep steel decking-failure modes and influence of transversal loading

in Association for Steel-Concrete Composite Structures (2015, December 03)

This paper presents the results of push-out test specimens on shear connectors for composite beams, which are placed centrally in the ribs of novel formed deep steel decking. These deck shapes have not ... [more ▼]

This paper presents the results of push-out test specimens on shear connectors for composite beams, which are placed centrally in the ribs of novel formed deep steel decking. These deck shapes have not been well considered in the development and the calibration studies of EN 1994-1-1. The presented tests have been designed to investigate the additional failure modes and the corresponding load-slip behaviour, with special consideration of the newly occurring failure modes in the rib. In addition, the vertical loading of the slab has been considered in the push-out tests by a transverse load, acting with the help of a supplementary hydraulic jack. The differences between a concentric and eccentric transverse loading and a constant and variable transverse loading was investigated in the test series. [less ▲]