Page 25 - Reinforced concrete voided slabs subjected to gravity and seismic actions

25 Structural typology description§cap 1In addition, Hendler also describes the aesthetic qualities of a continuous intrados that can be plastered, in addition to the benefits that were being recorded in numerous trials at the time in terms of sound insulation and fire resistance.In addition, Hendler also describes the aesthetic qualities of a continuous intrados that can be plastered, in addition to the benefits that were being recorded in numerous trials at the time in terms of sound insulation and fire resistance.In 1913 the American inventor John F. Golding patented a reinforced concrete floor with interposed metal voids (boxes) (figure 1.72).Golding in his patent specified that by boxes he meant any device suitable to produce empty space between the floor and the ceiling in the thickness of the floor. However he stated that compared to other forms of voids, such as tunnel ones, the box shape was preferable because it allowed taking advantage of the bi-directional behaviour of the reinforced concrete slab.Another interesting example using fibre tube voids in recent years are the voided floors used in the operational centre of the Security Pacific National Bank in Brea, California, built in the early ‘80s of the last century. Figure 1.13 shows the plan of the typical grid. Note that in the planimetric definition of the layout of the tubular voids, the bidirectional behaviour is included in the connection of the columns along the two orthogonal direc- tions. Furthermore there is a focus of leaving an appropriate solid band around the functio- nal columns to provide punching shear strength (see also the detail shown in figure 1.14).Figure 1.14. Solid anti-punching band – Security Pacific National Bank, Brea, California[image taken from (Benet and Williams, 1983) reproduced with permission of the American Concrete Institute]This brief historical-critical narration could continue but for the purposes we set out to illustrate here, this is sufficient and we can now jump directly to the end, essentially to 2001, the year in which the U-Boot Beton® was patented.up © Dalifoform Group © Daliform Grouup © Daliform Group © Daliform Group © Dalifoform Group © Daliform Group © Daliform Group © Daliform Grouup © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Dalifoform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Grouup © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Dalifoform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Grouup © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Dalifo form Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Grou© Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Dalifo iform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Grouup © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Daliform Group © Dalifo form Group © Daliform Group © Daliform Group © Daliform Group © Daliform Grouup © Daliform Group © Daliform Group © Daliform Group © Dalifoform Group © Daliform Group © Daliform Grouup © Daliform Group © Dalif form Grou