P 1481 - Development of standardised column-beam connections for steel and composite structures in German earthquake zones
Steel and steel-concrete composite structures subjected to earthquakes have an excellent dissipation potential. This property is utilised in modern constructions in order to erect high-performance and efficient …
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Steel and steel-concrete composite structures subjected to earthquakes have an excellent dissipation potential. This property is utilised in modern constructions in order to erect high-performance and efficient structures in areas affected by strong seismicity. However, the planned utilisation of dissipation requires that strict design rules - the so-called capacity design - are followed so that the dissipative plastic mechanisms in the components are activated before other (brittle) limit states are reached. In rigid frame structures, the beams are generally designed as dissipative elements; their connections to the columns and the columns themselves must be designed and constructed with sufficient overstrength compared to the plastic bending capacity of the beams.
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In regions where structures have to be designed for weak or moderate seismicity, the aforementioned approach is often not economical, as the required dissipation capacity in these regions is significantly lower. This leads to solutions in which the dissipation capacity is dispensed with altogether by designing the structures for elastic behaviour under earthquake loads. The reason for this is the considerable effort required for the beam-to-column connections, which must be designed according to the capacity rules even for low behaviour coefficients. This practice negates both the dissipation capacity of steel and composite structures and the economic advantage, as larger cross-sections have to be used. An alternative to this are dissipative beam-to-column connections, which provide the required degree of dissipation. However, the current draft earthquake standards lack rules and methods for the design and dimensioning of dissipative connections, although consideration of connection flexibility and verification of the rotational capacity of the connections under cyclic loading are required. Only a few verification methods have been implemented in the new version of the European seismic standard. The research project aimed to close these existing knowledge gaps. The methodology included the identification of common column-beam connections, the analysis of their behaviour and the optimisation of their properties for appropriate behaviour in the plastic range. Both steel and composite connections for buildings with different uses (office, industrial buildings) were optimised. The performance of these connections was verified experimentally through component and system tests (connections, frames). This experimental data was used to develop numerical models for both connections and frames, which were extended by parameter studies. Finally, component models of the connections were developed and integrated into structural models in order to assess the seismic performance of steel and composite structures. Finally, recommendations for the design were formulated on the basis of the research results. The goal of the research project was achieved Publication: June 2024 Authors: Prof. Dr.-Ing. Hoffmeister, Dr.-Ing. R. Don, Dipl.-Ing. G. Balaskas, Dr.-Ing. C. Vulcu, Prof. Dr.-Ing. U. Kuhlmann, Dipl.-Ing. G. Skarmoutsos
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P 1481 - Development of standardised column-beam connections for steel and composite structures in German earthquake zones—
€30.00
