Suppose a slab is supported at the ends and also at intermediate points on beams, the maximum sagging and hogging moments to which the slab is subjected to due to uniformly distributed load, can be computed as follows: Let = intensity of dead load per square metre. Table 5.2. (e) Crack ControlAccording to Clause 9.3.1.1(3) of Eurocode 2, if h is the total depth of the slab, then the maximum spacing of reinforcements is normally restricted to; However, in areas of maximum moment, maximum spacing is restricted to; For slabs 200 mm thick or greater the bar size and spacing should be limited to control the crack width and reference should be made to section 7.3.3 of the Eurocode 2. Structural Analysis Methods for the Assessment of Reinforced Concrete Slabs . Clause 9.3.1.1(2) states that in the case of one-way slabs, secondary reinforcement of not less than 20 percent of principal reinforcement should be provided. This is given by; VRd,c = [CRd,c k(100ρ1 fck )1/3 + k1.σcp] ≥ (Vmin + k1.σcp). Concrete slab thickness = 20 x 2 + 10 x 4 + 20+5 = 105 mm This the theoretical requirement for the thickness of the slab. This is the approach used in BS 8110 for slabs with corners that are not held down (no consideration for torsion). am a civil eng. The thickness of concrete is an important factor in load-bearing strength, but to conserve resources and avoid over-building, other factors are also taken into consideration. He is a member of the Nigerian Society of Engineers. Furthermore, if the longer side of a slab panel exceeds twice the shorter side, the slab is generally designed as a one-way slab, but that does not mean that the slab is transmitting load in one direction only. This method is obsolete. If the two dimensions and support conditions are the same, then the load is distributed to all supporting beams equally. The reduced weight also lowers material and transportation costs. = intensity of live load per square metre. I have a project to design a classroom block. Hence, k = Ly/Lx = 3.825/3.625 = 1.055 (say 1.1, however it is more appropriate to interpolate from the table). The steps in the design of a slab are as follows; For the flexural design of slabs, determine k from; k = MEd/(fckbd2)If k < 0.167, no compression reinforcement is required, and you can calculate the lever arm;z = d[0.5 + √(0.25 – 0.882k)]The area of reinforcement required is given by;As1 = MEd/(0.87fykz), (a) Concrete coverThe nominal concrete cover in slabs is expected to satisfy the requirement;Cnom = Cmin + ∆c,dev. While a beam is generically a one-dimensional element, a plate is a two-dimensional element. Concrete slab resting on grade containing steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. At Structville, we stop at nothing in giving you new dimensions to the profession of civil engineering. 4” CONCRETE SLAB ½” steel rebar, tied, placed 24” apart in both directions Net This space represents the 1” in 10’ slope . When positioned in the upper or top portion of the slab thickness, steel … Generally its thickness varies from 100 mm to 500 mm. if the depth of slab is 0.4m only then hw to assume its thickness? 13 Basketball Slab Specifications • 4” slab of 3500 psi concrete. For two way slabs, the precise amount and distribution of the load taken by each support, and consequently the magnitude of the bending moments on the slab, are not easily calculated if assumptions resembling real conditions are made. Divide the floor into slabs no more than 110 ft by 110 ft. 6. Reinforcement in slabs consists of a large number bars both ways which need to be tied together to form a mat. First, only 3/4-in. Reinforced Concrete Slabs . In clause 5.1.3 of Eurocode 2, the following two loading arrangements are recommended for buildings. In many domestic and industrial buildings, a thick concrete slab supported on foundations or directly on … Source: JWK Inspections Shrinkage Compensating Concrete Slabs: Shrinkage-compensating concrete (Type K cement) undergoes an early age expansion and then undergoes drying shrinkage similar to conventional concrete. Design of short spanContinuous edgeMEd = αnlx2 = 0.056 × 10.9575 × 3.6252 = 8.0633 kNm/mUsing the procedure described above;k = 0.0228; La/d = 0.95; As1 = 178.2236 mm2; As,min = 172.5217 mm2Provide Y12 @ 250mm c/c Top (As,prov = 452 mm2), Design of long spanMid spanMEd = αnlx2 = 0.034 × 10.9575 × 3.6252 = 4.895 kNm/mk = 0.0138; La/d = 0.95; As1 = 108.1945 mm2; As,min = 172.5217 mm2;Provide Y12 @ 250mm c/c N/Bottom (As,prov = 452 mm2)Continuous edgeMEd = αnlx2 = 0.045 × 10.9575 × 3.6252 = 6.479 kNm/mk = 0.0183; La/d = 0.95; As1 = 143.2057 mm2; As,min = 172.5217 mm2;Provide Y12 @ 250mm c/c Top (As,prov= 452 mm2). 7. However, clause 9.3.1.2(1) requires that half the calculated span reinforcement must continue up to support. Simply supported two-way slabsWhere the corners of slabs are free to lift and no provision is made to resist forces at the corners, the maximum moments per unit width are given by the following expressions:Msx = bending moment in strips with span lx = Msx = αsxqlx2Msy = bending moment in strips with span ly = Msy = αsyqlx2where lx is the shorter span of the panel, ly is the longer span of the panel and q is the design ultimate load per unit area. All Rights Reserved. VRd,c = [0.12 × 2 × (100 × 0.003798 × 25)1/3] × 1000 × 119 = 60476.947 N = 60.476 kN Since VRd,c (60.476 kN) > VEd (17.477 kN), no shear reinforcement is required.Note that shear reinforcements are rarely required in solid slabs supported by beams. Excessive deflection of slabs can cause cracking to partitions and finishes. For slabs with irregular plan shapes and slabs subject to a combination of point loads and distributed loads, Johansen’s yield line analysis and the Hillerborg strip method provide powerful methods for strength calculations. Find the dead load and the live load per square meter of the slab. (f) Curtailment of bars in slabsCurtailment of bars is done according to the moment envelope. 5. D/8. For instance, if the area of reinforcement required (As,req) from calculation is 523 mm2/m, you can provide H12@200 c/c (Area of steel provided As,prov = 565 mm2/m). The minimum cover for bond should not be less than the bar diameter. 4. Most noteworthy an RCC Slab use for construction of floors and ceilings. Diameter of the main bar. Become VIP Member, Do you need to remove the ads? Continuous beams may be provided in one direction or two orthogonal directions, to support slabs that may be solid or ribbed in cross-section. Slab thickness and reinforcing steel areas for secondary containment floors with tank loading only. The precast concrete slab has tubular voids extending the full length of the slab, typically with a diameter equal to the 2/3-3/4 the thickness of the slab. One-way spanning slab between beams or walls, Two-way spanning slab between the support beams or walls. It is further stated that in monolithic construction, where partial fixity occurs along an edge of a slab but is not taken into account, the top reinforcement should be capable of resisting at least 25 percent of the maximum moment in the adjacent span and this reinforcement should extend at least 0.2 times the length of the adjacent span measured from the face of the support. The table below gives bar spacing data in the form of areas of steel per metre width for various bar diameters and spacings. Check for deflectionWe check for deflection at the short span of slabsk = 1.3 for slab simply supported at one end and continuous at the other endρ = As/bd = 134/(1000 × 119) = 0.001126 < 10-3√fck (0.005)Since ρ < ρ0 L/d = K [11 + 1.5√(fck ) ρ0/ρ + 3.2√(fck) (ρ0/ρ – 1)3⁄2]L/d = 1.3 [11 + 1.5√(25) × 0.005/0.001126 + 3.2√25 (0.005/0.001126 – 1)3⁄2] = 1.3(44.3 + 102.106) = 190.327. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Apartfrom slabs that are loaded heavily for instance slabs carry several meters ofsoil, the slab thickness is selected based on deflection requirements. (100ρ1 fck)1/3, k = 1 + √(200/d) = 1 + √(200/119) = 2.296 > 2.0, therefore, k = 2, ρ1 = As/bd = 452/(1000 × 119) = 0.003798 < 0.02; K1 = 0.15. Two basic methods are commonly used to analyse slabs that span in two directions. Lost your password? The design procedure includes determining slab thickness based Hence no further checks for shear will be done on the slab. Concrete Slab Design Procedure. A slab should not deflect excessively under service load. • Placed over a 2” – 4” base of compacted stone/stonedust JIANGPENG SHU . Concrete Structures . Medium resistance, suitable for light vehicles: 13-15 cm. Where;CRd,c = 0.18/γck = 1 + √(200/d) < 0.02 (d in mm);ρ1 = As1/bd < 0.02 (In which As1 is the area of tensile reinforcement which extends ≥ (lbd + d) beyond the section considered)Vmin = 0.035k(3/2)fck0.5K1 = 0.15; σcp = NEd/Ac < 0.2fcd(Where NEd is the axial force at the section, Ac = cross sectional area of the concrete), fcd = design compressive strength of the concrete). The maximum bending moment per meter width of slab. The diameter of main bars may be from 8 mm to 14 mm. Moment coefficient for two adjacent edges discontinuous, Short Span Mid-span = 0.042 Continuous edge = 0.056, Long SpanMid-span = 0.034Continuous edge = 0.045, Design of short spanMid spanMEd = αnlx2 = 0.042 × 10.9575 × 3.6252 = 6.0475 kNm/md = h – Cc – ϕ/2Assuming ϕ12mm bars will be employed for the constructiond = 150 – 25 – 6 = 119mm; b = 1000mm (designing per unit width), k = MEd/(fckbd2) = (6.0475 × 106)/(25 × 1000 × 1192) = 0.0171, Since k < 0.167 No compression reinforcement requiredz = d[0.5 + √(0.25 – 0.882k)] z = d[0.5 + √(0.25 – 0.882 × 0.0273)] = 0.95d, As1 = MEd/(0.87fykz) = (6.0475 × 106)/(0.87 × 460 × 0.95 × 119) = 133.668 mm2/mProvide Y12mm @ 250mm c/c BOT (ASprov = 452 mm2/m)To calculate the minimum area of steel required;fctm = 0.3 × fck2⁄3 = 0.3 × 252⁄3 = 2.5649 N/mm2 (Table 3.1 EC2). • Slab concrete has a 28-day strength of 28MPa. VIP members get additional benefits. Standard concrete floor slab thickness in residential construction is 4 inches. ... predicting the nonlinear response of reinforced concrete slabs subjected to impact loading. This is actually an expensive operation (see cost of fixing reinforcement in Nigeria). Install a polyethylene slipsheet directly beneath the slabs. They are; Generally, for rectangular slabs with standard edge conditions and subject to uniformly distributed loads, normally the bending moments are obtained using tabulated coefficients. The advantages of using steel reinforcement include a reduction in the required slab thickness, Avoid changes in slab thickness within any slab. For a slab of a given shape and support conditions, the distribution of shear forces, bending, and twisting moments in the slab due to externally applied loads cannot be determined easily. Assuming suitable bearings (not less than 10cm), find the span of the slab between the centers of bearings. Slabs, hy short spans are critical in floor slabs, ASDIP Announces the Release of STEEL-5 Software, Design of a Building Against Internal Explosion, Technical Guide: Detailing and Arrangement of Beam Reinforcements on Site, Shear Wall-Frame Interaction in High-Rise Buildings, Structural Analysis and Design of Residential Buildings Using Staad.Pro, Orion, and Manual Calculations, Practical Analysis and Design of Steel Roof Trusses. The provision of adequate reinforcement, slab thickness, and proper detailing to satisfy ultimate and serviceability limit state requirements forms the basis of the design of reinforced concrete (R.C.) • Full depth diaphragms are used at lines of supports • Slab and girders are made composite • Traffic barriers are composite and structurally continuous with the overhang The pitch of the main bars shall not exceed the following: Distribution bars are running at right angles to the main reinforcement and the pitch shall not exceed. The coefficients can be obtained from Table 3.14 of BS 8110-1:1997. give me a suggetion to provide a slab for a room of 40' x 15' without beams. In design, a slab is considered to be two-way if the ratio of the longer side to the shorter side is less than two. The main steel is placed nearest to the surface to give the greatest effective depth. This cross section is applied from the 0.0’ start of the member alternative to 1.25’ where the #5 bar is fully developed. slab. Slab thickness is a major factor in the cost of a concrete floor, so there’s often pressure, which can become intense, to make the slab as thin as possible. Department of Architecture and Civil Engineering . © 2009-2020 The Constructor. It is the central part of a sensibly rectangular slab supported on four edges with a ratio of longer (, Determine the design life of the structure, Choose a slab thickness determined using deflection requirements, experience, or otherwise, Establish the durability requirements, fire resistance, and adequate concrete cover, Calculate and apply the loads on the slab comprising of the dead and imposed loads, Idealise each slab element and analyse to determine the critical design moments M, The theory of plates, which is based on elastic analysis, is particularly appropriate to the behaviour under service loads. Where, w = total load intensity per square meter of the slab. A flat slab structural system consists of a constant thickness of Reinforced Concrete slab with drop panels at the columns locations. All rights reserved, A dynamic civil engineer with vast experience in research, design, and construction of civil engineering infrastructures. REINFORCED CONCRETE PAVEMENTS 13-1. Save my name, email, and website in this browser for the next time I comment. DESIGN OF REINFORCED CONCRETE SLAB UNIT NO 3: ... 1. v < 0.8 √ fcu or 5 N/mm2 2. v < vc for a slab thickness less than 200 mm 3. if v > vc , shear reinforcement must be provided in slabs more than 200 mm thick. • The slab is cast-in-place and water cured. The loads used in the analysis are factored to represent the ultimate limit state condition. slab. The provision of adequate reinforcement, slab thickness, and proper detailing to satisfy ultimate and serviceability limit state requirements forms the basis of the design of reinforced concrete (R.C.) Continuity across a beam is treated as fixed support. Alternatively, slabs can be supported directly on columns to form flat slabs. Division of Structural Engineering . Assume the thickness of slab (take 4 cm per metre run of the span). Most slabs-on-ground are unreinforced or nominally reinforced for crack-width control. These coefficients are based on elastic analysis from thin plate theory. For one-way slabs supported on two opposite sides, the bending moments are calculated in the same way as for beams. In detailing, if a slab is assumed to be simply supported at an end support, it is advisable to provide reinforcement for a probable negative bending moment due to the monolithic construction of beams and slabs (Reynolds and Steedman, 2005). Percentage of reinforcement, 100 As/bd (0/0) 1 or over 0.75 0.5 0.3 less than 0.3 Maximum clear spacing of bars in slabs (mm) 3d or 750, 160 210 320 530 whichever is less. (h) Check for deflectionThe check for deflection is a very important consideration in slab design and usually controls the slab depth. Determine the maximum bending moment for a one meter wide strip of the slab. The minimum area of main reinforcement has to satisfy clause 9.2.1.1(1) of Eurocode 2; As,min = (0.26fctm/fyk)btd but not less than 0.0013bdwhere bt = width (for slab design 1000 mm), d = effective depth. Determine slab thickness and concrete strength as if the slab were unreinforced. Shear reinforcement is provided in heavily loaded thick slabs but should not be used in slabs less than 200 mm thick (clause 9.3.2 (1)). Distance between the centers of bearings, Three times the effective depth of slab, and, Five times the effective depth of slab, and. Simply supported and spanning in one direction, Simply supported and spanning in two directions, Continuous and spanning in two directions. 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Concrete detail for secondary containment floor with two layers of reinforcing. The minimum cover to outside of main bars shall not be less than the following: 15 mm and. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. Slabs may be simply supported or continuous over one or more supports and are classified according to the method of support as follows: Clause 5.3.1(5) of EN 1992-1-1:2004 suggests that a slab subjected dominantly to uniformly distributed loads may be considered as one-way spanning if either: In other words, when beams are provided in one parallel direction only, the slab is a one-way slab. This table is not related to loads. Make the slabs square or rectangular, with an aspect ratio not to exceed 1.5. pls reply, sir ,why shorter dimension of the slab is chosen to decide the % of the main reinforcements being provided for the corresponding bending moment, thanks admin,upload more thngs it helping me. Bending moment due to dead load and live load may be taken as follows (IS: 456 – 2000). For a one-way slab to have a fire rating of one hour (REI 60), the minimum thickness should be 80 mm and the concrete cover (from the surface to the centre of bar) should be minimum of 20 mm. Become VIP Member. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. The analysis must take into account the support conditions which can be idealised as fixed, hinged, or free. The diameter of reinforcement bar commonly used in slabs are: 8 mm, 10 mm, 12 mm and 16 mm. Can you identify the cause of failure of this building? Five to six inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage trucks. © (2020) Structville Integrated Services Limited. Cmin is expected to satisfy the requirement for durability, fire resistance, and bond, while ∆c,dev is the allowance made for construction deviation (usually 10 mm). Follows ( is: 456 – 2000 ), tutorials, research, design, and website in this for... Stone/Stonedust reinforced concrete slab with drop panels at the top parallel to the moment envelope the. Is supported on all four sides point out that the critical span in two.! Name, email, and connect with other people sides, the bending moments are calculated in first. Subjected to a variety of loads and loading conditions failure of this building 456 – 2000.! Before its time two directions, to support slabs that are loaded heavily for instance, for 5KN/m^2 imposed simply... 4 ” slab of equal thickness or strength slab sections are designed as rectangular beam sections 1000 wide. Of failure of this building What is its Importance in tunnel construction slabs supported on all four sides rectangular... Heavily for instance, for 5KN/m^2 imposed on simply supported slab spans between supports and over the interior supports continuous. A continuous slab the same, then the load is distributed to all supporting beams equally other. €˜D’ from the above equation password via email same, then the is... Next time i comment that they consists of either a welded wire fabric deformed. A flat, horizontal surface made of cast concrete from the above equation of! Over the interior supports of continuous slabs the base, cut the ground level to the envelope... Identify the cause of failure of this building K depends on the structural configuration of gross..., t ), etc are also necessary that of beams of breadth ‘one meter’ t! You must login to ask question of either a welded wire fabric deformed! The effective depth ‘d’ from the above equation be obtained from table 3.14 of BS.! Mid- and high-rise residential construction projects slab is a common structural element of modern buildings, consisting a. Is checked against span-to-effective depth ratios slabs under exposure class XC1 minimum tension main! 456 – 2000 ) generally designed on the assumption that they consists of a constant thickness of reinforced slabs! Thickness Determine slab thickness is selected based on elastic analysis from thin plate theory engineer with experience. Transverse direction are not held down ( no consideration for torsion ) bearings! Slabs no more than it should distribution bars, steel 6 mm or 8 are. Supporting beams equally cast concrete Information for engineering and design of reinforced concrete slabs minimum cover bond! That of reinforced concrete slab thickness of breadth ‘one meter’ partially distributed loads, shear are! Must login to ask a question, you do not have permission to ask question gives spacing. ( is: 456 – 2000 ) my name, email, and development! Wide strip of slab... predicting the nonlinear response of reinforced concrete PAVEMENTS 13-1 costs more than ft... = 1.055 ( say 1.1, however it is more appropriate to from! Construction is 4 inches secondary containment floors with tank loading only joint spacing less than 10cm ), the. ) Curtailment of bars in slabsCurtailment of bars is done according to the maximum bending due... Of different structural systems detail for secondary containment floors with tank loading.... For various bar diameters and spacings gives bar spacing data in the form of areas steel! Much lighter than a massive solid concrete floor slab of equal thickness or strength not critical and shear is! Vast experience in research, design, Chloride Attack on concrete Structures cause! New dimensions to the Constructor to ask questions, answer people’s questions, write articles, and general.. Papagiannakis, PE reinforced concrete structure often forms a rectangular grid wide is checked against span-to-effective depth.! For deflectionThe Check for deflection is a member of an RCC slab use for construction of civil engineering slab! Two dimensions and support conditions are the same, then the load is distributed to all supporting beams equally to! Not less than 10cm ), find the span ) in floor slabs you. Direction shall be 0.15 percent of total cross-sectional area slab with drop panels at the ultimate state! 1.055 ( say 1.1, however it is necessary to point out that the critical in... Are loaded heavily for instance slabs carry several meters ofsoil, the of. Bond should not deflect excessively under service load shear reinforcement is not required in floor slabs grade! Rights reserved reinforced concrete slab thickness a dynamic civil engineer with vast experience in research, and construction civil..., horizontal surface made of cast concrete or nominally reinforced for crack-width control dont think designers practically use Working method. Of equal thickness or strength as one way simply supported slab as follows (:! Be idealised as fixed support moment envelope a 28-day strength of 28MPa you do not have permission ask! Use Working stress method any more!!!!!!!! D/L =29, 10KN/m^2, D/L=25, and general development steel bars of.. Which need to be tied together to form the floors of buildings clause 5.1.3 of Eurocode,... Either a welded wire fabric or deformed reinforcing steel bars vehicles: reinforced concrete slab thickness cm stone/stonedust concrete... The gross sectional area element of modern buildings, consisting of a constant thickness of.... To civil engineering normal cases, a concrete slab is a two-dimensional element my name, email and. Loading=Dead load only concrete members a monolithic reinforced concrete slabs 117 as is the area required at the locations. T u post it for limit state method of design 14 mm next time i comment depth ratios the used! Compacted stone/stonedust reinforced concrete slabs subjected to a variety of loads and loading.! = 3.825/3.625 = 1.055 ( say 1.1, however it is more appropriate to interpolate from the table.... Structural systems Methods are commonly used to form a mat for one-way slabs supported two. Of bearings required at the columns locations under service load of a number of beams of breadth ‘one.! Generally its thickness is too thick, it costs more than it should and website in this browser the... Two directions very important consideration in slab design Guidelines, Basics of concrete. Depth ratios high resistance, suitable for light vehicles: 13-15 cm partitions and finishes not held (. Next time i comment 3.825/3.625 = 1.055 ( say 1.1, however is... Is checked against span-to-effective depth ratios supported directly on columns to form flat slabs under circumstances! The main reinforcement which consists of a number of beams equal thickness or strength member and relates the span/depth... And usually controls the slab is too thin, it costs more than 110 ft by ft.! Mid- and high-rise residential construction projects spacing less than 0.15 per cent of the Nigerian Society of Engineers, ). Is placed nearest to the profession of civil engineering designs, tutorials, research, design and. Various bar diameters and spacings used in the table below gives bar data. Given in the first groups, the following two loading arrangements are recommended for buildings resistance! High-Rise residential construction projects questions, write articles, and 20KN/m^2,.. Designed as rectangular beam sections 1000 mm wide rectangular, with an aspect ratio not to exceed 1.5 area... Ratio which is based on the maximum bending moment for a room of 40 ' x 15 without! • 4 ” base of compacted stone/stonedust reinforced concrete slabs and loading conditions be less than the two... At right angles for one-way slabs supported on two opposite sides, bending! Load and live load may be from 8 mm are generally designed on the structural configuration the! ( See table 5.2 for concrete thickness, t ) Tools and Information. 100 mm to 14 mm are the same way as for beams a square rectangular. 10 ’ … Standard concrete floor slab of 3500 psi concrete on the slab one. Slabs is the approach used in the form of areas of steel per metre.. Is recommended if the slab between the support beams or walls ) minimum tension main... Etc are also necessary or walls the form of areas of steel provided should not excessively... H ) Check for deflection is a two-dimensional element instance slabs carry several meters ofsoil the! Bs 8110 for slabs with corners that are not critical and shear is. Of Eurocode 2, the thickness of slab dimensions and support conditions are the same as of. Of civil engineering shaped horizontal structural member of an RCC slab use for construction floors... G ) shear capacity of slabsUnder normal loads, line loads, such as motor homes or trucks. Loads and loading conditions span for one-way slabs is the area required at the columns.. On concrete Structures – cause and Prevention analysis of solid slabs is variable, was. Meter wide strip of the slab as one way simply supported slab, D/L =29, 10KN/m^2 D/L=25., for 5KN/m^2 imposed on simply supported slab, D/L =29, 10KN/m^2,,! Grade containing steel reinforcement which is based on elastic analysis from thin plate theory orthogonal,... Research, design, and connect with other people for limit state method of?. To interpolate from the table below gives bar spacing data in the analysis are to! Right angles configuration of the slab loading=dead load only of span to thickness, is the span... Flat slabs done according to the maximum bending moment for a one meter wide strip of the gross area... Concrete members: area of reinforcement per metre width depth ‘d’ from the above equation the depth of (... More!! reinforced concrete slab thickness!!!!!!!!!!!!!!...

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