Rcc slab can be various types depending on various criteria. Design a oneway slab for an interior bay of a multistory office building using the. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. When a rectangular slab is supported on all four sides, but the ratio. Minimum of clear span plus effective depth of slab center to centre distance between the supports. One way simplysupported and continuous solid slab free download as powerpoint presentation. Deflections of twoway slabs scholars mine, missouri. Singlyreinforced beam design example cee 3150 reinforced concrete design design a rectangular reinforced concrete beam for loads given below. The one way slabs are economical up to the span of 3. Simply supported oneway slab simple version concrete.
You can design a single span simply supported, fixed or cantilever or many continuous spans. Reinforced concrete design 1 design of slab examples. The paper presents the cost optimization of reinforced concrete simply supported oneway slabs under uniformly distributed load with the nonlinear programming approach. Two way slabs have two way bending unlike one way slab. 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. Simply supported not built integrally with its supports. Difference between simply supported and continuous slabs or beams where they are used.
Design of oneway slabs check if it is oneway slab system if clear span in one direction, l1, is greater than or equal to two times the clear span in other direction, l2, then it is. Oneway simply supported slab, span length, l 10 ft normal weight concrete unit weight 145 pcf. Supported by walls a 0 no beams for beam supported slabs a way slab over a clear span of 3. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. The structural frame consists of four columns, two beams and one slab project. Analysis and design of pyramidal roof slab patil s. One way slabs are those supported continuously on the two opposite sides so that the load sare carried along one direction only.
Design of concrete structures 14th edition, 2009, by arthur h. Design of one way slabs the structural action of a one way slab may be visualized in terms of the deformed shape of the loaded surface. Slabs are usually used in floor and roof construction. Design of reinforced concrete structures ii twoway slabs 1 1.
Slab design example 02 design of simply supported slab two way spanning span of slab 4. Preliminary design of slab thickness thickness design depends on boundary conditions supports. Reinforced concrete, 2014, 9th edition, aci 31811 code edition, by jack c. Rectangular beams and oneway slabs page 3 of 9 design of rectangular beams and oneway slabs continued a. Chapter 3 design of rectangular beams and oneway slabs. Slab design is comparatively easy when compared with the design of other elements. Difference between simply supported and continuous slabs. Step 2 design forces draw panel of slab and indicate maximum design moments, shears and in plane loads, if any, per unit width of slab. This would usually include dimensioning and detailing curtailment, laps, ubars and also undertaking the other checks detailed in section 3. Simply supported beams have zero secondary moments significant.
Analysis and design of slabs two way civil engineers pk. Distance between the centers of bearings, clear span plus effective depth. Jun 30, 2018 difference between simply supported and continuous slabs or beams where they are used. The two classifications are oneway slab and twoway slab. Reinforced concrete slab slabs are plate elements forming floors, roofs in buildings. Figure 1 shows a rectangular slab, simply supported along its two opposite long edges and free of any support along the two. The one way slab is a simple wide shallow rectangular beam as far as its structural analysis is concerned. Singlyreinforced beam design example uwplatteville. Design of one way and two way slabs, design of staircases. Behavior of pyramidal slab is not like one way or two way slab. The oneway slab is a simple wide shallow rectangular beam as. The materials to be used are grade c30 concrete and grade 500 reinforcement.
Rcc slab design depends on the on the dimensions of the slab after which the slab is termed as a oneway slab or a twoway slab in the design of rcc structures, column design and beam design are to be done before we start with rcc slab design basic rules followed in the design of simply supported slab. Design procedure steps for one way slab slab design steps. In case of one way and two way slab bending moment along effective span is predominant and according to that steel is provided in either direction. Oneway slab simply supported slab the following describe the way to reinforce a oneway simply supported slab. The thickness ranges from 10 to 50 centimeters and are supported on columns and beams. The slabs that are supported only at end are called simply supported slabs i. Before going to this topic, please read it there are two types of slab classification based on the direction of bending occurs in these slabs. Pdf the paper presents the cost optimization of reinforced concrete simply supported oneway slabs under uniformly distributed load with the nonlinear. In two way slabs shorter direction strip carry greater %age of load. Chapter 7 analysis of continuous oneway slabs blogger.
Mar 07, 2017 rcc slab design depends on the on the dimensions of the slab after which the slab is termed as a oneway slab or a twoway slab in the design of rcc structures, column design and beam design are to be done before we start with rcc slab design basic rules followed in the design of simply supported slab. Two way simply supported slab dl20 to l30 two way restrained slab dl30 to l32 c load on slab. Pdf cost optimum design of reinforced concrete simply. Oneway and twoway slabs oneway slabs transfer the imposed. Positive yield line will be at the midspan of oneway simply supported slabs.
Minimum thickness of oneway solid slabs element simply supported one end continuous both ends continuous cantilever oneway solid slabs l20 l24 l28 l10. This would usually include dimensioning and detailing curtailment, laps, ubars and also undertaking the. One way slab being supported on two opposite sides only leads to the structural action in single direction. Learning outcomes at the end of this lecture, the student should be able to a classify all types of solid slabco1 b identify one way and two way solid slab co1 c use a relevant clauses in code of practice co1 d design oneway slabs co2 e details the slabsco1.
Slab design much simpler than beam design concrete slabs behave primarily as flexural members and design is similar to that of beams, although in general much simpler because. Reinforced concrete slab design and detailing guide is456. Bending will take place in the two directions in a dishlike form. Design a simply supported one way slab over a clear span of 3. The first stage of the design is finding the bending moment of the slab panels. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Spinning one way supported on two sides such as between beams or walls the way a slab spans its supports has a direct impact on the way in which the slab will bend. Accordingly, main reinforcement is required in the two directions. Most often, these concrete slabs are used to construct floors and ceilings in high rise buildings and skyscrapers. Design of reinforced concrete structures ii two way slabs 1 1. Slab is checked for deflection shear and development length.
One way spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. The oneway slabs are economical up to the span of 3. Slab design example design a oneway slab for an interior bay of a. Slabs are generally designed on the assumption that they consists of a number of beams of breadth one meter. Cost optimum design of reinforced concrete simply supported. The thickness of one way slab varies between 100mm to 150mm or even more depending upon the span and based on the deflection considerations. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. Dead load d x 25 knm 2 where d is thickness of slab in m.
Therefore, other design values can be reduced according to the. Difference between simply supported and continuous slabs or. If slab is supported on all four sides and r shorter side longer side one. The thickness of oneway slab varies between 100mm to 150mm or even more depending upon the span and based on the deflection considerations. Analysis and design of slabs one way civil engineers pk.
Crosssections can include a combination of rectangular, i, t and lsections, and spans can have constant or tapered sections. Reinforced concrete design 1 design of slab examples and. Pdf basic principles, theory and oneway slabs san patel. Chapter 3 design of rectangular beams and oneway slabs 12.
Oneway slab simply supported slab reinforcement enote. Figure 1 shows a rectangular slab, simply supported along its two opposite long edges and free of any support along the two opposite short edges. The load on slab comprises of dead load, floor finish and live load. The slab has to carry a distributed permanent action of 1. This strip extends from one end support a to the other end support d, as shown in the fig. Effective span for concrete slab design for simply supported slab. The paper presents the cost optimization of reinforced concrete simply supported one way slabs under uniformly distributed load with the nonlinear programming approach. What are the design requirements of concrete slab design. The example regards slab s1 which is 180 mm thick, its primary dimension is equal.
Simply supported one way slab a rectangular reinforced concrete slab is simply supported on two masonry walls 250 mm thick and 3. Find depth of slab using deflection control criteria. Where it forms end of a continuous slab, the length of centre of support shall be taken. Slabs having supports on less than four sides can be designed as one way. Slab resting on walls or sufficiently deep and rigid beams on all sides. It carries a live load of 4 knm 2 and floor finish of 1. Slabs may be simply supported or continuous over one or more supports and are classified as follows. Oneway and twoway slabs university of asia pacific. The planar roof slabs are further classified as follows. The effective span of a simply supported slab shall be taken as the lesser of the following. Just as we saw in the case of a simply supported oneway slab, in the case of a continuous oneway slab also, we consider a strip of 1m width. Learning outcomes at the end of this lecture, the student should be able to a classify all types of solid slab co1 b identify one way and two way solid slab co1 c use a relevant clauses in code of practice co1 d design oneway slabs co2 e details the slabs co1.
For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. The direction in which the load is carried in one way slab is called the span. Oneway spanning slabs should be treated as beams of unit width and chapter 2 should be followed except for minimum shear reinforcement. Minimum thickness for cantilevers can be considered equal to twice that of for a simple span.
Here are the steps for the design procedure for one way slab in steps. For those who do not know what are the des ign requirements of a slab. Slabs may be simply supported or continuous over one or more supports and are classified according to the method of support as follows. Such as ribbed slab, flat slab, solid slab, continuous slab, simply supported slab. An optimal plan geometry with all same supports is a square, based on load distribution into both directions. Design of simply supported slab click here link 01. Guide to design of simply supported slabs design of rcc. Breadth of slab is already fixed b mm shear stress are usually low in a slab except when there are heavy concentrated loads, and. Design of reinforced concrete structures ii twoway slabs. A rectangular reinforced concrete slab is simply supported on two masonry walls 250mm thick and 4. Chapter 3 design of rectangular beams and oneway slabs 12 h a 12 strip in a simply supported one way sl ab h.
Design of oneway slabs the structural action of a oneway slab may be visualized in terms of the deformed shape of the loaded surface. Ultimate behavior of oneway spanning slab linear elastic analysis methods such as moment distribution are linear elastic methods. In case of slabs thin members, no need of even minimum shear reinforcement. To see their result for this slab we will find the load factor. Flat slab supported directly on columns without beams. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Design of slab examples and tutorials by sharifah maszura syed mohsin. They may be supported on two opposite sides only fig. Moduleiii design of short and long columns with axial and eccentric loading, design of isolated column footing. Behaviour and reinforcement of oneway staircase the deformation and the cracking due to flexure which at this figure are presented magnified, are similar to those met in the horizontal oneway slab, and therefore the necessary reinforcement is also similar. Apr 27, 2017 2 even when a rectangular slab is supported on all the four edges, the slab may be considered as a one way slab if the lengthtobreadth lb ratio of the slab is equal to or greater than two. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Design and detailing of reinforced concrete beams and slabs.
528 360 1184 340 972 945 115 1362 307 513 1518 276 632 934 1142 1134 60 613 1506 131 51 696 230 614 1369 687 480 845 349 590 754 56 1563 8 1386 177 1434 1385 350 1354 689 1367 1118 692 500 628 544