Multi storey buildings
The chapter presents the structural elements of steel multi storey buildings, such as columns, main and secondary beams or concrete slabs. For these elements various cross-section types, both pure steel or composite steel-reinforced concrete, are shown and alternative options commented, presenting the advantages and characteristics of each one. Information is included in respect to the serviceability requirements, the behavior under fire conditions and the methods of construction.
It follows the presentation of the various structural systems that ensure the overall lateral stability of the buildings, such as moment resisting frames (MRF), concentric (CBF) or eccentric (EBF) bracing systems, shear walls of different types or combination of the above, in association with the diaphragm action of the floor slabs and the rigidity of the connections and joints (simple, rigid or semi-rigid joints). This enables the designer to obtain sufficient information to select, for each specific case of a building, the appropriate structural configuration for the overall structure, and for its parts, such as the form and cross-section type of the individual structural elements and the connections and joints.
The chapter concludes with the presentation of the provisions of EN 1998 (Eurocode 8) for buildings constructed in seismic regions. These rules are specific for each type of system ensuring the overall lateral stability of the structure (MRF, CBF, EBF etc.) and are presented in specific sections. The seismic rules are related to the required stiffness and strength, the hierarchy of yielding, known as capacity design, as well as the damage limitation for the non-structural elements of the building in cases of frequent earthquakes, weaker than the design ones. The above seismic rules are to be considered in combination with the corresponding ones, presented in relevant section of chapter 6.
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