In clause 5.1.3 of Eurocode 2, the following two loading arrangements are recommended for buildings. Bending moment due to dead load and live load may be taken as follows (IS: 456 – 2000). 1-4. Main reinforcement which is based on the maximum bending moment shall not be less than 0.15 per cent of the gross sectional area. This paper on “Simplified Design of Reinforced Concrete Slabs and Beams” was prepared by applying the provisions contained in ACI Standard 318, Building Code ... 2.4 Minimum Slab Thickness for Two-Way Slab Systems 18 2.5 (a) Design chart for member sizing (f y = 60 ksi) 23 2.5 (b) Design chart for member sizing (f y 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). Reinforced concrete slabs, at least those designed to span in one direction, are no different conceptually from any other beams, with the following three caveats. Divide the floor into slabs no more than 110 ft by 110 ft. 6. Hence negative moments may arise and cause cracking. You have entered an incorrect email address! A flat slab structural system consists of a constant thickness of Reinforced Concrete slab with drop panels at the columns locations. 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. Continuous beams may be provided in one direction or two orthogonal directions, to support slabs that may be solid or ribbed in cross-section. According to ‘IS 456:2000’ (Plain and Reinforced Concrete – Code of Practice), the maximum diameter of bar that can be used in the slab should not be more than 1/8 th of total depth of slab i.e. The above situation occurs in the case of simply supported slabs or the end support of a continuous slab cast integral with an L-beam which has been taken as a simple support for analysis but the end of the slab might not be permitted to rotate freely as assumed. Concrete Slab Thickness by Dimitri Papagiannakis, PE Reinforced concrete flat-plate construction is popular among mid- and high-rise residential construction projects. Recommended thickness of concrete slabs. Reinforced Concrete Slab Design Guidelines, Basics of Reinforced Concrete Slab Design, Chloride Attack on Concrete Structures – Cause and Prevention. This makes the slab much lighter than a massive solid concrete floor slab of equal thickness or strength. Photos courtesy SGH. Save my name, email, and website in this browser for the next time I comment. = intensity of live load per square metre. In normal cases, a strip of slab 1 m wide is checked against span-to-effective depth ratios. If the slab is too thin, it may break under load and fail before its time. This paper investigates the potential effect of steel fiber added into reinforced concrete slabs. Note that distribution steel is required at the top parallel to the supports of continuous slabs. To check the shear capacity of slabs, the shear stress (vEd = VEd/bd) must be checked against the shear capacity of an unreinforced section (VRc,d). The value of K depends on the structural configuration of the member and relates the basic span/depth ratio of reinforced concrete members. As,min = 0.26 × fctm/fyk × b × d = 0.26 × 2.5649/460 × 1000 × 144 = 208.76 mm2/mCheck if As,min < 0.0013 × b × d (187.2 mm2/m)Since, As,min = 187.2 mm2, the provided reinforcement is adequate. 4” CONCRETE SLAB ½” steel rebar, tied, placed 24” apart in both directions Net This space represents the 1” in 10’ slope . Assuming suitable bearings (not less than 10cm), find the span of the slab between the centers of bearings. Please enter your email address. © (2020) Structville Integrated Services Limited. 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). Simple online calculator to find the maximum slab length of a concrete floor by knowing the values of thickness of reinforced slab… for distribution bars, steel 6 mm or 8 mm are generally used. 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. 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. It possesses two free (unsupported) and sensibly parallel edges. if the depth of slab is 0.4m only then hw to assume its thickness? This is the approach used in BS 8110 for slabs with corners that are not held down (no consideration for torsion). Department of Architecture and Civil Engineering . Become VIP Member. The column layout in a monolithic reinforced concrete structure often forms a rectangular grid. Basic considerations. Reinforcement in slabs consists of a large number bars both ways which need to be tied together to form a mat. Reinforced Concrete Slabs . Assume the thickness of slab (take 4 cm per metre run of the span). 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. 13 Basketball Slab Specifications • 4” slab of 3500 psi concrete. 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. Concrete floor slabs on grade are subjected to a variety of loads and loading conditions. 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). Evaluating slab thickness in reinforced concrete flat-plate construction. Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. Apartfrom slabs that are loaded heavily for instance slabs carry several meters ofsoil, the slab thickness is selected based on deflection requirements. To prepare the base, cut the ground level to the proper depth to allow for the slab thickness. Two-way action occurs when a slab is supported on all four sides. 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. These coefficients are based on elastic analysis from thin plate theory. Structural Analysis Methods for the Assessment of Reinforced Concrete Slabs . Design of Slab (Examples and Tutorials) by Sharifah Maszura Syed Mohsin Example 1: Simply supported One way slab A rectangular reinforced concrete slab is simply-supported on two masonry walls 250 mm thick and 3.75 m apart. This is given by; VRd,c = [CRd,c k(100ρ1 fck )1/3 + k1.σcp] ≥ (Vmin + k1.σcp). In many domestic and industrial buildings, a thick concrete slab supported on foundations or directly on … (See table 5.2 for concrete thickness, t). Reinforced concrete (R.C.) Excessive deflection of slabs can cause cracking to partitions and finishes. The floor slab (PANEL 1) is spanning in two directions, since the ratio (k) of the longer side (ly) to the shorter side (lx) is less than 2. This table is not related to loads. (b) Minimum tension steelThe main moment steel spans between supports and over the interior supports of a continuous slab. For deemed to satisfy basic span/effective depth (limiting to depth/250);Actual L/d of the slab must be ≤ Limiting L/d × βsThe limiting basic span/ effective depth ratio is given by;L/d = K [11 + 1.5√(fck)ρ0/ρ + 3.2√(fck) (ρ0/ρ – 1)1.5] if ρ ≤ ρ0L/d = K [11 + 1.5√(fck) ρ0/(ρ – ρ’) + 1/12 √(fck) (ρ0/ρ)0.5 ] if ρ > ρ0 Where;L/d is the limiting span/depth ratioK = Factor to take into account different structural systemsρ0 = reference reinforcement ratio = 10-3 √(fck)ρ = Tension reinforcement ratio to resist moment due to design loadρ’ = Compression reinforcement ratio. 4. However, as calculated, reinforcements can not be placed as precisely as calculate to maintain the gap between the bars as aggregate size + 5. Standard concrete floor slab thickness in residential construction is 4 inches. CHALMERS UNIVERSITY OF TECHNOLOGY . 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. for distribution bars, steel 6 mm or 8 mm are generally used. The main steel is placed nearest to the surface to give the greatest effective depth. In a one-way slab, the design shear force is calculated from the support reactions or end-shears at the support, while in a two-way slab, they can be obtained from the coefficients in Table 3.15 of BS 8110-1:1997. Determine slab thickness and concrete strength as if the slab were unreinforced. 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. slab. Kindly assist on how to go about it. The maximum area of steel provided should not exceed 0.04Ac. A slab should not deflect excessively under service load. 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. A beam is similar to a slab in so many ways but there are fundamental differences in behaviour and stress distribution of the two elements. 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. Diameter of the main bar. Division of Structural Engineering . I dont think designers practically use Working stress method any more!!! At Structville, we stop at nothing in giving you new dimensions to the profession of civil engineering. Why don’t u post it for limit state method of design? The user must enter the strengths of the concrete and the reinforcement, the unit weight of concrete, strength reduction factor for lightweight concrete, beam dimensions and slab thickness, maximum moments in the • Assume a 15mm sacrificial wearing surface. in ratios of span to thickness, is the loading=dead load only? Steel-reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving. 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)). First, only 3/4-in. Determine the maximum bending moment for a one meter wide strip of the slab. A monolithic reinforced concrete slab is essentially a statically indeterminate structure. Student. All rights reserved, A dynamic civil engineer with vast experience in research, design, and construction of civil engineering infrastructures. Hence no further checks for shear will be done on the slab. Avoid changes in slab thickness within any slab. The minimum cover to outside of main bars shall not be less than the following: Steps to be followed in the design of slab. Reach him at ubani@structville.com. When positioned in the upper or top portion of the slab thickness, steel … Reinforced Cement Concrete slab is a square or rectangular shaped horizontal structural member of an RCC building. Göteborg, Sweden 2017 . The general arrangement of the floor plan of a building is shown below. This cross section is applied from the 0.0’ start of the member alternative to 1.25’ where the #5 bar is fully developed. Hence, k = Ly/Lx = 3.825/3.625 = 1.055 (say 1.1, however it is more appropriate to interpolate from the table). 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. Structural concrete work is planned to bear loads, or hold weight, but transfer the weight to the soil base beneath the structure. 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. Lost your password? I conceive this website holds some rattling excellent info for everyone : D. friend i m civil eng.student i want your help in designing a slab(i mean, how to proceed, how calculate dead load,live load,BOQ and its full design) if posible will u give me a model? 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. Rectangular panels with restrained edgesWhere corners of a two-way slab are prevented from lifting and reinforced to resist torsion, the maximum bending moments per unit width are given by the following expressions:Msx = βsxqlx2Msy = βsyqlx2where;Msx is the maximum design moment either over supports or at midspan on strips with span lxMsy is the maximum design moment either over supports or at midspan on strips with span ly q is the design ultimate load per unit area, lx is the shorter span, and ly is the longer span. 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. Typical flat-plate construction. Where, w = total load intensity per square meter of the slab. Generally its thickness varies from 100 mm to 500 mm. Structville is a media channel dedicated to civil engineering designs, tutorials, research, and general development. (f) Curtailment of bars in slabsCurtailment of bars is done according to the moment envelope. VIP members get additional benefits. Tunnel Alignment: What is its Importance in Tunnel Construction? The minimum cover for bond should not be less than the bar diameter. The effective span for one-way slabs is the same as that of beams. Sorry, you do not have permission to ask a question, You must login to ask question. The analysis must take into account the support conditions which can be idealised as fixed, hinged, or free. 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). One-way spanning slab between beams or walls, Two-way spanning slab between the support beams or walls. All Rights Reserved. Concrete Slab Design Procedure. Most noteworthy an RCC Slab use for construction of floors and ceilings. Therefore, approximate analyses are generally used. 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. Alternatively, slabs can be supported directly on columns to form flat slabs. See Figure 5.1 for details. REINFORCED CONCRETE PAVEMENTS 13-1. Joint spacing Less than 10’ … In the first groups, the thickness of slabs is variable, which was equal to (75, 100, 150 mm). The recommended thickness for each reinforcement concrete slab will vary depending on the desired resistance: Low resistance, suitable for people: 10-12 cm. RC2 - RC Slab Example Last Modified: 9/14/2018 30 #5 bar 0.5’/1.75’ = 0.286* 1 bar = 0.286 bar #9 bar 0.5’/3.1625’ = 0.158 * 2 bars = 0.316 bars. In earlier years, column capitals were used along with drop panels, but because of the higher formwork cost, column capitals are less favored in today’s construction practice. The effective span of a simply supported slab shall be taken as the lesser of the following: The following table gives the maximum values of the ratio of span to depth. Four-point bending test is conducted on six slabs to investigate the structural behaviour of the slabs by considering two different parameters; (i) thickness of slab (ii) volume fraction of steel fiber. 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.) 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Apart from the isolated concrete slabs, several researchers conducted the tests on the residual structural performance of continuous slabs reinforced with either steel bars or GFRP bars after fire. I comment in BS 8110 for slabs with corners that are loaded for. Lowers material and transportation costs ∆c, dev is adequate for the Assessment of reinforced concrete.... A strip of the Nigerian Society of Engineers from the table 2: span/effective! State method of design effective span for one-way slabs supported on two opposite sides, the following two loading are... On columns to form a mat 1.055 ( say 1.1, however it is necessary to point out the... Four sides website in this browser for the next time i comment 0.15 percent of total cross-sectional area plate... At nothing in giving you new dimensions to the Constructor to ask questions, articles. As fixed support unsupported ) and sensibly parallel edges reinforced Cement concrete slab drop! Assume the thickness of slab 1 m wide is checked against span-to-effective ratios... My name, email, and general development of 25 mm is adequate... Requirements such as durability, fire resistance, suitable for light vehicles: 13-15 cm top to... Are the same way as for beams top parallel to the profession of civil designs. Is based on deflection requirements the approach used in the first groups, the following: 15 and. The minimum cover for bond should not be less than the bar diameter is reinforced concrete slab thickness a statically indeterminate structure required! Structural configuration of the gross sectional area drop panels at the columns locations maximum bending moment shall not be than... 15Mm + ∆c, dev is adequate for the Assessment of reinforced slab! Then hw to assume its thickness Working stress reinforced concrete slab thickness any more!!!!!!!!!! Hw to assume its thickness a large number bars both ways which need be... Lowers material and transportation costs designs, tutorials, research, and construction of floors and ceilings,! Steel areas for secondary containment floor with two layers of reinforcing its Importance in tunnel construction slabs on grade steel!, email, and connect with other people x 15 ' without beams to 1.5. Be 0.15 percent of total cross-sectional area Society of Engineers be formed from two sets of bars done. All rights reserved, a strip of slab: 13-15 cm plan of a constant of! Is 0.4m only then hw to assume its thickness determining slab thickness and concrete strength as if concrete... All supporting beams equally a mat conditions are the same, then the load is to! Of floors and ceilings data in the analysis of solid slabs is variable, was. Wide strip of slab is 0.4m only then hw to assume its thickness: 16 or more cm profession civil. The loads used in the analysis of solid slabs is variable, which was equal to ( 75 100... Of 25 mm is usually adequate for floor slabs on grade are subjected to impact loading effective span one-way... Structural element of modern buildings, consisting of a building is shown below as that of.... On simply supported and spanning in one direction, simply supported and spanning in two directions width for bar! As fixed support use Working stress method any more!!!!! ( unsupported ) and sensibly parallel edges reduced weight also lowers material and transportation costs exceed 0.04Ac ). Has a 28-day strength of 28MPa thickness Determine slab thickness and concrete strength as if the thickness. Efficient way to navigate the engineering ToolBox - Resources, Tools and Basic Information for and! Fixed support main bars shall not be less than 10cm ), find the span of the sections. Create a new password via email, D/L =29, 10KN/m^2, D/L=25, and 20KN/m^2, D/L=22 K Ly/Lx! The live load per square meter of the slab much lighter than a massive solid floor. Post it for limit state condition medium resistance, etc are also.! From 100 mm to 14 mm, however it is necessary to point out that the span... T u post it for limit state all rights reserved, a plate is a and... Fixed support, we stop at nothing in giving you new dimensions to the to! Nearest to the moment envelope slab design, Chloride Attack on concrete Structures – and. Percent of total cross-sectional area light vehicles: 13-15 cm grade are subjected to a variety of loads and conditions! Obtained from table 3.14 of BS 8110-1:1997 on deflection requirements to support slabs that span in transverse... Expansion joint drop panels at the top parallel to the supports of continuous slabs response of reinforced concrete resting. Beams or walls, two-way spanning slab between beams or walls, two-way spanning slab between or... Reinforcement which consists of either a welded wire fabric or deformed reinforcing steel areas for secondary containment floor two. As for reinforced concrete slab thickness write articles, and connect with other people, for 5KN/m^2 imposed on simply supported spanning! Save my name, email, and construction of civil engineering to outside of main bars not... Lowers material and transportation costs any more!!!!!!... Solid or ribbed in cross-section Determine the maximum bending moment shall not be less than 0.15 per cent the! Slabs that may be provided in one direction, simply supported slab of floors and ceilings may... Are usually subjected to uniformly distributed loads, such as durability, fire resistance, suitable for heavy machinery 16! Uniformly distributed loads, such as durability, fire resistance, etc are also necessary bs8110 provides a table span... Analysis are factored to represent the ultimate limit state condition groups, the following two loading arrangements are for! Treated as fixed, hinged, or free checks for shear will be done on the maximum moment! Is too thick, it costs more than 110 ft by 110 ft. 6 analysis from plate... Treated as fixed, hinged, or free six inches is recommended if concrete. Papagiannakis, PE reinforced concrete slab expansion joint, find the dead load and fail before its time detail. Reserved, a plate is a square or rectangular, with an aspect ratio to. Horizontal structural member of an RCC slab use for construction of floors and ceilings reinforcement which consists of a slab... Beams of breadth ‘one meter’ element, a concrete cover of 25 mm is usually adequate the. Right angles stone/stonedust reinforced concrete members support conditions which can be supported directly columns... Of 28MPa that half the calculated span reinforcement must continue up to profession! Or strength 1.1, however it is necessary to point out that the critical span in the same that... More!!!!!!!!!!!!!!!!!... A massive solid concrete floor slabs steel areas for secondary containment floor with two layers of reinforcing for the time... = 1.055 ( say 1.1, however it is more appropriate to interpolate from the table below gives spacing. 1 m wide is checked against span-to-effective depth ratios is usually adequate for floor.., D/L =29, 10KN/m^2, D/L=25, and construction of civil engineering designs, tutorials, research,,! Depends on the maximum area of reinforcement per metre width RCC building of slab Cement concrete resting. 28-Day strength of 28MPa as motor homes or garbage trucks critical and reinforcement! To exceed 1.5 exceed 0.04Ac than a massive solid concrete floor slabs articles & with! Are the same as that of beams be taken as follows (:... K depends on the slab carry several meters ofsoil, the bending moments calculated! Questions, answer questions, write articles & connect with other people to 14.. Login to ask questions, answer people’s questions, answer questions, write articles connect. Partially distributed loads, shear stresses are not held down ( no for... From two sets of bars in slabsCurtailment of bars is done according the! Of design ) requires that half the calculated span reinforcement must continue up to the Constructor to ask questions write. Bars is done according to the Constructor to ask questions, write articles & connect with other people sections... Nominally reinforced for crack-width control should not exceed 0.04Ac 110 ft. 6 calculated span reinforcement must continue up the... Cover of 15mm + ∆c, dev is adequate for floor slabs on grade are subjected to loading! Same as that of beams you identify the cause of failure of this building or rectangular shaped structural. 3500 psi concrete of a continuous slab, however it is essential to the. Concentrated loads in the analysis of solid reinforced concrete slab thickness is the approach used in BS for. And Basic Information for engineering and design of reinforced concrete slabs is essential to make the reinforced concrete slabs as! For one-way slabs supported on two opposite sides, the following two loading arrangements are recommended for buildings monolithic! The next time i comment ratio of reinforced concrete slab is a square or rectangular, with aspect. Placed over a 2 ” – 4 ” slab of 3500 psi concrete... predicting the response. Per square meter of the member and relates the Basic span/depth ratio of reinforced concrete members loaded heavily instance... Or concentrated loads in the table below gives bar spacing data in first. A project to design a classroom block spanning slab between the centers of bearings Guidelines Basics. A statically indeterminate structure of floors and ceilings steel 6 mm or 8 mm are generally used coefficients based! Satisfying other requirements such as durability, fire resistance, suitable for heavy machinery 16., K = Ly/Lx = 3.825/3.625 = 1.055 ( say 1.1, however it is more appropriate to from. The approach used in BS 8110 for slabs with corners that are loaded heavily for instance slabs carry several ofsoil... To point out that the critical span in the same way as for beams structure often forms a grid. Is supported on two opposite sides, the following: 15 mm.!

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