Floor asphalt, 25 mm thick clay tiling, mm thick concrete slab stone aggregate solid, 100 mm thick solid, 150 mm thick galvanized steel floor deck excl. The design bending moments are zero at discontinuous ends, negative at continuous ends and positive at midspans. Ce 403, fall 20 oneway slab design 2 4 aci 31811 referenced pp 2 4 typical concrete floor systems copied from ceco concrete construction pamphlet design procedure a oneway slab is designed by considering a onefootwide strip of slab. Twoway concrete floor slab with beams design and detailing. The construction and design of concrete slabs on grade d.
The concrete floor slab itself provides structural support for floor loads and suitable backup for floor coverings and finishes. Reinforcing is added to control shrinkage cracking and maximize the distance between designed joints. Find the following parameters for design moments in step 2 per unit width step 4 note. Shear strength of beamless slabs usually a controlling factor. Conceptual design and design examples for multistorey buildings.
Design strips are used to divide up the floor system in two essentially orthogonal directions in. Oneway and twoway slabs oneway slabs transfer the imposed. The design procedure includes determining slab thickness based on moving live loads and then checking adequacy of slab thickness for stationary live load. Heavy loads in building s such as warehouses include moving load s, stationary live loads, and wall loads.
A new method for designing floor slabs on grade due to the difficulty of applying simplified design methods, amongst them being the portland cement association pca and wire reinforcement. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. For this reason, some supplemental design guidance is provided when practical and technically justified. Base floor slabwaterproof system a typical base floor slab where the design criteria include controlling moisture migration and water vapor transmission into the interior space can be referred to as a waterproof. After this publication, it was subsequently adopted by the uniform building. The slab thickness depends on the type of loads on the floor slab. This appendix presents design examples of the retrofitting techniques for elevation, dry floodproofing, wet. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Etabs beam and column design and detailing easy explaination duration. The slab has to carry a distributed permanent action of 1. For slender floor structures, as made in steel or composite construction, serviceability criteria govern the design. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter.
This manual p rescribes the criteria for the design of concrete floor slabs on grade in buildings for heavy loads and is applicable to all elements responsible for military construction. The construction and design of concrete slabs on grade. Reinforced concrete slab design and detailing guide is456. It has been the most common material used in slabs but several new. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is 456. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. Design of twoway floor slab system comparison of oneway and. Floor slab design floors are designed as slabs on grade. At that time, this technique brought a considerable.
Pdf composite slab systems were first developed in the late 1930s for use in tall buildings. Design examples are given in annex b of this design guide. In addition to general ultimate and serviceability limit state design issues, practical design considerations such as the formation of holes in the slab, support details, fire protection, and attachments to the slab are discussed. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Tm 580912 concrete floor slabs on grade subjected to heavy. Design of slab examples and tutorials by sharifah maszura syed mohsin. The cellular beams permit passage of 400 mm diameter circular service ducts fully glazed facade, which was directly attached to the composite slab the inclined tubular columns and shear connections. Twoway concrete floor slab with beams design and detailing csa a23. The imposed loading on the floor is 5 knm2 and an allowance. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Ce 479 fall 05compositefloor decks purdue university. Buoyancy forces control the building if dry floodproofed during a flooding event unless structural measures, such as floor anchors or additional slab mass, or nonstructural measures such as allowing the. A floor slab in a building where stability is provided by shear walls in one direction ns. This table details some of the special considerations and finishing techniques that are.
Flat slab analysis, design and detailing pdf civil. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. The slab has to support the load of three columns present on the first floor that do not continue until the ground floor, due to the necessity of having a large open. The lateral loads are independently resisted by shear walls. These characteristics and simplified methods for their determination are briefly described. Floor classifications table 1 describes the nine classes of concrete floors according to aci 302, guide to concrete floor and slab construction. Structural clt floor and roof construction presenter. Example composite design design composite concrete slab on steel deck floor for 125 psf live load. Concrete slabs are often carried directly by columns without the use of beams or. Twoway joist concrete slab floor waffle slab system.
Concrete floor slab construction process includes erection of formwork, placement of reinforcement, pouring, compacting and finishing concrete and lastly removal of formwork and curing of concrete slab. The report addresses the planning, design, and detailing of slabs. The minimum thickness can be determined by many factors. The floorfloor zone is a minimum of 3,65 m and the structure and services zone is only 850 mm. Many radiant floors, most using copper tubing buried within concrete slabs, were installed and used successfully in the 1960s and 70s. Pdf composite floor slab design and construction researchgate. Pdf twowayconcretefloorslabwithbeamsdesigndetailing.
Design of slab for flexure 067 m unit width of slab. Pdf a new method for designing floor slabs on grade due to. Lecture series on design of reinforced concrete structures by prof. The imposed loading on the floor is 5 knm2 and an allowance of 2. A civil engineer must know all the aspects regarding the flat floor system. Although coldformed steel framing for floor systems also is permitted by the irc, it is not covered here. These materials are originally located at different websites. Introduction concrete slabs on grade are a very common type of concrete construction. Slabs can be onground, suspended, or a mix of both. Reinforced concrete sk 33 section through slab showing stress due to moment.
Design of slabs onground reported by aci committee 360 aci 360r06 this document presents information on the design of slabs onground, primarily industrial floors. First floor slab made by date dead load self weight of hollow pot slab knm2 superimposed dead load screed, plaster and finishes, 1. Following are the rcc slab design and detailing guidelines. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. Background information on design theories is followed. Reinforced concrete design 1 design of slab examples and. Concrete slab floors come in many forms and can be used to provide great thermal comfort and lifestyle advantages. Oct 21, 2016 etabs2016concrete floor slab design duration. Dhang, department of civil engineering, iit kharagpur.
The thickness of a floor slab must be determined early in design because the weight of the slab is an important part of the dead load of the structure. Introduction the design guide comprehends simple methods, design tools and recommendations for the acceptance of vibration of floors. This strip is designed basically as if it were a 12inchwide beam, t inches thick. Once the concrete cures, the resulting composite floor system provides superior strength and stiffness. The system also includes shear studs installed and supplied by others, to provide a composite floor system that allows for the loads to be transferred into the steel frame. The design procedure separately includes determining thickness of slab under wall load. Twoway concrete slab on beams floor analysis and design. They can be insulated, both underneath and on the edges. Design strips are used to divide up the floor system in two essentially orthogonal directions in modeling the floor for design. Design of heavy duty concrete floor slabs on grade. For this slab, panel a has two discontinuous exterior edges and two continuous interior edges, panel b has one discontinuous and three continuous edges, while the interior panel c has all edges continuous. Tm 580912 concrete floor slabs on grade subjected to. Oct 05, 2019 flat slab system is an important division of concrete floor system.
Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Use i wsd, ii usd to design the twoway slab shown below, carrying floor. Reinforced concrete design 1 design of slab examples. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. In most cases, the slab thickness is designed as an unreinforced concrete section. Oneway and twoway slabs university of asia pacific. Minimum slab thickness of rc slab to prevent undesirable. It is potable and ultraviolet resistant for protection against sun damage during installation. Jul 02, 2010 lecture series on design of reinforced concrete structures by prof.
Chapter 4, floor construction 71 the primary design consideration in choosing the minimum size and the maximum span and spacing of floor joists, trusses, beams, girders, and headers is adequate support for dead and live vertical loads as prescribed by the code depending on the uses that a floor must support. Design of twoway floor slab system comparison of oneway and twoway slab behavior oneway slabs carry load. Asce, secb course content slab on grades construction. Conceptual design and design examples for multistorey. The 78 durapoly xl pex is a large diameter tubing with the same wall thickness as the commonly used 12 pex. A design strip is a region assigned to a hypothetical support line that joins a line of columns and or walls in one direction. This table details some of the special considerations and finishing techniques that are appropriate for each class of floor.
The slab is without drops and is supported internally and on the external long sides by square columns. Design the slab system shown in figure 1 for an intermediate. Copper within concrete is highly susceptible to corrosion and a lifespan of 50 years for a radiant floor was considered exceptional. The steel deck will be used on 86 3continuous spans. Flat slab system is an important division of concrete floor system. Pdf a new method for designing floor slabs on grade due.
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