Shear-Bearing Capacity of the Concrete Slab at Web Openings in Composite Beams


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by Wieland Ramm, Professor; Technical University of Kaiserslautern, Structural Design, D-67663 Kaiserslautern, Germany, wramm@rhrk.uni-kl.de,
Christian Kohlmeyer, Research Engineer; Technical University of Kaiserslautern, Structural Design, D-67663 Kaiserslautern, Germany, kohlmeye@rhrk.uni-kl.de,



Document Type: Proceeding Paper

Part of: Composite Construction in Steel and Concrete V:

Abstract: In the region of web openings in composite beams the concrete slab carries a large amount of the shear force. The aim of a research project at the Technical University of Kaiserslautern is to investigate the shear-bearing capacity of the concrete slab in combination with the shear connectors. Seventeen full-scale tests on composite beams with large web openings under high vertical shear forces have been conducted and four different failure modes were examined. The tensile forces in the studs in the region of the opening showed that the three studs closest to the high moment end of the opening transmit the biggest part of the vertical shear force from the steel web into the concrete slab and that a considerable amount of the total vertical shear force is transmitted over the opening with the help of the headed studs since they act as a kind of shear reinforcement.

Subject Headings: Composite beams | Shear forces | Concrete slabs | Webs (structure) | Web beams | Concrete beams | Studs | Vertical loads |

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