Structural Engineering and Mechanics

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The influence of different factors on buildings' height in the absence of shear walls in low seismic regions

  • Keihani, Reza (School of Computing and Engineering, University of West London) ;
  • Bahadori-Jahromi, Ali (Civil Engineering, School of Computing and Engineering, University of West London) ;
  • Goodchild, Charles (Principal Structural Engineer, the Concrete Centre) ;
  • Cashell, Katherine A. (Structural Engineering, Department of Civil and Environmental Engineering, Brunel University)
  • Received : 2020.02.04
  • Accepted : 2020.05.18
  • Published : 2020.10.10
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Abstract

Shear walls are structural members in buildings that are used extensively in reinforced concrete frame buildings, and almost exclusively in the UK, regardless of whether or not they are actually required. In recent years, the UK construction industry, led by the Concrete Centre, has questioned the need for such structural elements in low to mid-rise reinforced concrete frame buildings. In this context, a typical modern, 5-storey residential building is studied, and its existing shear walls are replaced with columns as used elsewhere in the building. The aim is to investigate the impact of several design variables, including concrete grade, column size, column shape and slab thickness, on the building's structural performance, considering two punching shear limits (VEd/VRd,c), lateral drift and accelerations, to evaluate its maximum possible height under wind actions without the inclusion of shear walls. To facilitate this study, a numerical model has been developed using the ETABS software. The results demonstrate that the building examined does not require shear walls in the design and has no lateral displacement or acceleration issues. In fact, with further analysis, it is shown that a similar building could be constructed up to 13 and 16 storeys high for 2 and 2.5 punching shear ratios (VEd/VRd,c), respectively, with adequate serviceability and strength, without the need for shear walls, albeit with thicker columns.

Keywords

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