Both methods use the same procedure to divide the moments so found between the middle strip and column strips of the slab and the beams if any. Cantilever slab design part1 by parag kamlakar pal. Cantilever slab supported on a reinforced concrete beam with top and bottom reinforcement as well as middle torsion reinforcement. My telegram channel only for civil engineering study to click this link for joining i have designed of cantilever. The preferred method is method 3 for rectangular sections. Design of cantilever slab spreadsheet download link more from my sitevoided twoway slab design based on aci 31814 spreadsheetdeck toggle navigation about us. The objective of the study conducted was to identify and address concerns with aci 318 section 9. They are projections from wall face of lintel beams or floor slabs. Department of mechanics, materials and structures english. Structural calculations for posttensioned beam and oneway. Design of reinforced concrete beams 45 m modular ratio the graphs in fig.
Possible modes of failure for freestanding concrete cantilever retaining walls are illustrated in cartoon fashion in figure x. Even while designing they are considered as oneslabs with cantilever fixed or continuous at supports. Structural design of cantilever slabs solved example structville. Design the continuous slab and draw a detailed section. The set of calculations for level 3, level 4, and le vel 5 roof is. There are no hard and fast rules when a cantilever slab be supported by a cantilever beam. Structural design of a reinforced concrete balcony slab to bs 8110 design of reinforced concrete balcony with dwarf wall. Design of cantilever slab spreadsheet the engineering community. Feb 18, 2017 cantilever slab design full with detail knowledge.
Punching shear at the loaded area a perimeter of the loaded area b design value of the shear stress at the loaded area. Design aid 6 beam design formulas with shear and moment. These materials are originally located at different websites. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. Design the roof slab, beam and column of house given in figure 1.
The dead load on the slab due to selfweight plus 77psf. Slabs having supports on less than four sides can be designed as oneway. Design aid 6 beam design formulas with shear and moment diagrams. A stair is to be designed to span a large vertical distance by dividing it into. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. When zd is determined, the prestressing force required to balance an. Concrete pool design spreadsheet based on aci 31814. Design of cantilever slab civil engineering youtube. Apr 4, 2012 this is a typical reinforced concrete cantilever slab reinforcement detail with a constant slab width. Temperature and shrinkage reinforcement is provided along the direction perpendicular to the span. It is noted that an undue amount of nonprestressed reinforcement is calculated and added in the design to reduce the crack width to the maximum allowable value. Hello in this video cantilever slab is design as per is. Purpose of building residential f ck 25 mpa f yk 460 mpa concrete cover 25 mm height of block wall 2.
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. Effects of inclusion of boundary condition factor in the proposed hmin equation were studied and justified using sap2000 software. Identify the geometry of the structure such as span, support constraints. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Design of cantilever slab spreadsheet engineering books. 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. Design envelopes for cantilever slabs were developed using kingery and. Sep 16, 2015 this spread sheets is useful for design of cantilever slab as per is 456. Article pdf available in practice periodical on structural design and construction 241. The structure of each cantilever is similar to that of the rest of slab.
In the temporary condition no water will be taken into account. To design any structure, and not just a cantilever slab, here is the general procedure. To hold the top reinforcement in position f 6 mm stirrups are used every 20. Reinforced concrete cantilever retaining wall analysis and design aci 31814 reinforced concrete cantilever retaining walls consist of a relatively thin stem and a base slab. The base is divided into two parts, the heel and toe. Some of the functional requirements of staircases are. Calculating the subtotal for the floor, ceiling, walls, footing, and slab. Structural design of cantilever slabs solved example. Main reinforcement runs in the transverse direction at the top side of the steps, while shrinkage reinforcement runs at the bottom side of the slab in the transverse and longitudinal directions. Flat slab analysis, design and detailing pdf civil. The total dead load of the structure can be found by adding the two.
Calculation example cantilever beam thestructuralengineer. The fe modeling with ansys solid65 elements for flat slab cantilever deflections. Design of slab for flexure 067 m unit width of slab. Retaining wall design temporary condition the following calculations will consider the worst case. Pdf cantilever slab design ramjan shehzaad academia.
This spread sheets is useful for design of cantilever slab as per is 456. M ed is that part of the unbalanced slab bending moments that is transferred into the column at the support. Point load this problem is designed to demonstrate how to check the ability of a composite slab to carry a 3000 lb point load over an area of 4. Pdf design envelopes for cantilever slabs to resist blast loads.
Where reinforce ment quantities are not known, an assumption may be made of the per centage of reinforcement. Structural design of a reinforced concrete balcony slab to bs 8110. Pdf finiteelement analysis of cantilever slab deflections with. A slab strip of unit width is analysed using simple beam theory. Reinforced concrete cantilever retaining wall analysis and.
Find the following parameters for design moments in step 2 per unit width step 4 note. Structural design of a reinforced concrete balcony slab to bs. Voided twoway slab design based on aci 31814 spreadsheet. The result of the fe analyses were verified by checking the procedure, assumptions and. If slab is supported on all four sides and r shorter side longer side 8. If slab is supported on all four sides and r shorter side longer side slab. Cantilever slab design bending strength of materials. Pdf design envelopes for cantilever slabs to resist. Redistribution of force concentrations in reinforced concrete. A complete design should address each of these modes of failure. Structural design of a reinforced concrete balcony slab to.
In any span, the max cable sag, zd depends on the concrete cover requirements and the tendon dimensions. Design and detailing of a cantilever slab is the same as that of a cantilever beam section 3. Jul 30, 2019 hello in this video cantilever slab is design as per is. The stem may have constant thickness along the length or may be tapered based on economic and construction criteria. Worked example 2 design of concrete cantilever retaining.
Whereas, if bracing is in front of the wall and is in compression instead of tension, the wall is called buttress retaining wall. Reinforced concrete sk 33 section through slab showing stress due to moment. The trial depth is selected based on spandepth ratio of 7, as in is. A stair is to be designed to span a large vertical distance by dividing it into smaller vertical distances, called steps. Design and analysis of retaining walls 2 economical when the wall height exceeds 8m. Also, the building has a plaza area on the ground level which carves out a portion of ground level 1 and level 2. Analysis and design of cantilever slab beam structure.
May 16, 2019 design of cantilever slab spreadsheet download link more from my sitevoided twoway slab design based on aci 31814 spreadsheetdeck toggle navigation about us. Design values for wood construction asdlrfd american w ood council beam design formulas with shear and moment diagrams. Reinforced concrete constant width cantilever slab detail. A civil engineer must know all the aspects regarding the flat floor system. Manual for design and detailing of reinforced concrete to the september 20 code of practice for structural use of concrete 20 2. Design of reinforced concrete balcony with dwarf wall. Manual for design and detailing of reinforced concrete to the. The crosssection of a continuous oneway slab in a building is shown in figure 7.
May 16, 2019 slab cantilever reinforcement design spreadsheet download link. Buildinghow products books volume b slabs cantilevers. 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. Coefficient and moment along x and yaxes illustration for calculation of. A stair is a system of steps by which people and objects may pass from one level of a building to another. Temperature and shrinkage reinforcement is provided. Analysis and design of slabs one way civil engineers pk. Flat slab analysis, design and detailing pdf civil engineering. Calculate bending moments, shear forces and deflections in ultimate limit state. Slab cantilever reinforcement design spreadsheet download link more from my sitevoided twoway slab. Cantilever slab design slab design slab 7 slab work m.
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