Solved example a cantilever slab 200 mm thick is 1. The slab is supported on beams of size 225 x 500 mm spaced at 4. When zd is determined, the prestressing force required to balance an. Manual for design and detailing of reinforced concrete to september 20 the code of practice for structural use of concrete 20 contents 1. Usually balcony slabs are cantilever slab and hence a provision for wall load at free end is included so that the spread sheet is. Slab design is comparatively easy when compared with the design of other elements. The program is developed around the robust computational core of two popular programs ptdata. Voided twoway slab design based on aci 31814 spreadsheet. Structural design of a reinforced concrete balcony slab to. The design examples provide coverage of all applicable limit states. Design of reinforced concrete structures ii twoway slabs.
The basic design precepts employed in cantilever walls include considerations of dead man tiebacks, taking active pressures to the bottom of the wall and considering any reductions in passive resistance for inclined slopes. Hello in this video cantilever slab is design as per is. Pdf cantilever slab design ramjan shehzaad academia. Concrete pool design spreadsheet based on aci 31814. This is an extremely popular system offering benefits that include zero lot lines, a vertical wall face and a. Slabs are usually used in floor and roof construction. Recommended limiting values for composition and properties of concrete ref. Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Manual design of beam and raft foundation to eurocode 2 pdf references ubani o. Design of cantilever slab spreadsheet download link more from my sitevoided twoway slab design based on aci 31814 spreadsheetdeck toggle navigation about us. Pt designer is a computer program for the design and analysis of linear posttensioned concrete floor systems. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. This spread sheets is useful for design of cantilever slab as per is 456.
Usually balcony slabs are cantilever slab and hence a provision for wall load at free end is included so that the spread sheet is useful for practical purposes. Slabs and flat slabs lecture 5 19 th october 2016 contents lecture 5 designing for shear in slabs including punching shear detailing solid slabs flat slab design. Design and analysis of retaining walls 3 f crib walls or coffer dams are cells or units to be filled with soil or builtup members of pieces of precast concrete or metal and are supported by anchor pieces embedded in the soil for. Structural design of a reinforced concrete balcony slab to bs 8110 design of reinforced concrete balcony with dwarf wall. In any span, the max cable sag, zd depends on the concrete cover requirements and the tendon dimensions.
Oneway slabs normally design as a beam with cables running in the direction of the span at uniform centres. Practical structural analysis and design of residential buildings using staad pro v8i, csc orion, and manual calculations. Different types of shear reinforcement used at column heads. Basic design criteria concentrically loaded d2 all sides c critical section for twoway shear b critical section for oneway shear a critical section for flexure outside face of concrete column or line midway between face of steel column. Oneway and twoway slabs university of asia pacific. Design of cantilever slab civil engineering community. They are projections from wall face of lintel beams or floor slabs. Design example 1 cantilevered overhead sign support. What are the typical reinforcement details of a cantilever. Reinforced concrete design to bs8110 structural design 1. Civilax is the knowledge base covering all disciplines in civil engineering. Full beam design example cee 3150 reinforced concrete design fall 2003 design the. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only.
Threespan continuous curved igirder beam bridge design example. Punching of flat slabs design for shear at th e column heads 12. Analysis and design of slabs one way civil engineers pk. Member minimum thickness, h simply supported one end continuous both end continuous cantilever solid oneway slab. Where tl tension lap cl compression lap ta tension anchorage h slab thickness lc cantilever length ls length of adjacent span as calculated reinforce. A slab strip of unit width is analysed using simple beam theory. There are no hard and fast rules when a cantilever slab be supported by a cantilever beam. Cantilever retaining wall sheet excel web share 20161018t23. Design of cantilever slab civil engineering youtube. Slabs having supports on less than four sides can be designed as oneway. Appendix a examples colorado department of transportation. They may be supported on two opposite sides only fig. Design of reinforced concrete structures ii twoway slabs 8 c. Department of mechanics, materials and structures english.
Calculation example frame analysis uniform load calculation example find the center of gravity surface calculation example design bolted connection of tension plates ec3 calculation example cantilever beam, temperature change calculation example undamped free vibration part a. The first stage of the design is finding the bending moment of the slab panels. Depending on the boundary condition and the properties of the slabs, methods of finding bending moment is expressed in the bs 8110 part 01 as follows. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. Threespan continuous curved tubgirder bridge these topics and design examples are published separately for ease of use, and available for free download at the nsba and fhwa websites. Threespan continuous straight tubgirder bridge design example. Reinforced concrete design to bs8110 structural design 1 lesson 5 5 4.
Cross sectional constant defines torsional properties c x. Download the full calculation sheet from the link below. The trial depth is selected based on spandepth ratio of 7, as in is. Using aashto lrfd bridge design specifications 4th ed. Strength and deformation characteristics for concrete ref. A 2 2area 2 a c 2 2 posttensioned concrete design table 11 list of symbols used in the aci 31808 code cp area enclosed by the outside perimeter of the section, in a g gross area of concrete, in a 2 l total area of longitudinal reinforcement to resist torsion, in a o area enclosed by the shear flow path, sqin a oh area enclosed by the centerline of the outermost closed. Pt designer design of posttensioned concrete floors.
Net, which many engineers have come to trust over the years for its accuracy and flexibility. Cantilever retaining wall sheet excel civil engineering. Moment of inertia method i gross concrete section only find moment of inertia of gross concrete section see table 11. Manual for design and detailing of reinforced concrete to. D6 building on strong and safe foundations d foundation analysis and design examples p wwrfv q h gc pwwrf windward roof 400. I85 atlanta, ga design a structure to support a sign 22 ft. Instructional materials complementing fema p751, design examples reinforced concrete footings. Even while designing they are considered as one slabs with cantilever fixed or continuous at supports. Reinforced concrete design 1 design of slab examples. Minimum thickness of nonprestressed oneway slab normal weight concrete and grade 60 grade 420 reinforcement.
The typical reinforcement details of a cantilever slab would be something like this. Design of cantilever slab spreadsheet engineering books. Design example 1 cantilevered overhead sign support truss with post problem statement. If slab is supported on all four sides and r shorter side longer side slab. Deflection generally governs design for cantilever walls more than 18 feet high.
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