423 Engineered design 4231 General An engineered design involves the use of

423 engineered design 4231 general an engineered

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4.2.3 Engineered design 4.2.3.1 General An engineered design involves the use of structural analysis based on the vertical and horizontal loads to be borne by the structure. The indivi dual components are designed and detailed to carry the calculated forces and moments. A key feature of an engineered building is that it includes a lateral- force resisting system designed in accordance with accepted engineering practice. Engineered design is generally employed for buildings different in configuration from the traditional types shown in Figures 4-14 to 4-16. This method of design is also required for buildings which have similar configurations to the traditional types but which are considered irregular due to the presence of one or more of the following features: a) where sections of exterior shear panels or reinforced frame are not in one plane vertically from the foundation to the uppermost storey in which they are required; b) where shear panel or reinforced frame members are not oriented in mutually perpendicular directions; c) where sections of the shear panel or reinforced frame on any one storey above grade are constructed of dissimilar bracing systems; d) where a section of a floor or roof is not laterally supported by a shear panel or reinforced frame on all edges; e) where an opening in a floor or roof exceeds the lesser of 3.60 m or 50% of the smaller dimension of the slab; and f) where portions of a suspended floor are vertically offset.
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PCTTS 599: 20XX 27 Ground floor slab suspended or on grade Suspended first floor slab Masonry Ground floor slab suspended Shear panel Masonry Suspended ground floor slab with crawl space Ground floor slab suspended or on grade Columns, beams & shear panel structure or on grade Masonry Framed structure or on grade Ground floor slab suspended Columns, beams & shear panel structure Suspended ground floor slab with crawl space Columns, beams & shear panel structure Suspended first floor slab Ground floor slab suspended or on grade Suspended first floor slab Ground floor slab suspended or on grade Suspended ground floor slab with crawl space Framed structure Framed structure (a) 2 storey structure on flat site on sloping site (b) Single storey structure (c) Single storey structure on flat site Figure 4-14 Single storey and two storey structures utilizing one structural system throughout
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PCTTS 599: 20XX 28 Fig 4-15 Single storey and two storey structures utilizing two structural systems Ground floor slab suspended or slab on grade Suspended first floor slab Ground level columns, beams & shear panel structure First level masonry Ground floor slab suspended or slab on grade Ground level framed structure First level masonry Suspended first floor slab Crawl space framed structure Suspended ground floor slab Crawl space columns, beams & shear panel structure First level masonry Suspended ground floor slab First level masonry (a) 2 storey structure on a flat site (b) Single storey structure on a sloping site
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PCTTS 599: 20XX 29
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