Diaphragm Floor Slab

Abstract

The subject of the final chapter is the analysis of a floor slab acting as a diaphragm in a multi-storey building to resist horizontal seismic loading. The floor length is 56.00 m and the width 22.60 m. The seismic load is active in the shorter floor direction and is resisted by two reinforced concrete cores, with side lengths about 7.00 m, and by 22 concrete columns. The cores and springs are all modelled as springs. The seismic loading is based on an earthquake with a strength of 0.42 times the acceleration of gravity. The floor mass is multiplied by this seismic acceleration, yielding a uniformly distributed area load. The analysis is performed using the Matlab code given in Appendix B. For modelling of the springer-panel model, SAP2000 is applied. At the chosen spring stiffnesses, 16% of the seismic loading is resisted by the columns and 84% by the cores.