Become VIP Member. 7. 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. 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. 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 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. Most slabs-on-ground are unreinforced or nominally reinforced for crack-width control. 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The column layout in a monolithic reinforced concrete structure often forms a rectangular grid. The diameter of main bars may be from 8 mm to 14 mm. 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? Kindly assist on how to go about it. Continuity across a beam is treated as fixed support. Assume the thickness of slab (take 4 cm per metre run of the span). The loads used in the analysis are factored to represent the ultimate limit state condition. The design procedure includes determining slab thickness based 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. 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). Table 5.2. 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. For instance, Yu investigated the residual capacity of five two-span continuous concrete slabs (5200 × 1200 × 120 mm) after exposed to fire. 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 13 Basketball Slab Specifications • 4” slab of 3500 psi concrete. When positioned in the upper or top portion of the slab thickness, steel … Main reinforcement which is based on the maximum bending moment shall not be less than 0.15 per cent of the gross sectional area. Hence no further checks for shear will be done on the slab. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! The maximum area of steel provided should not exceed 0.04Ac. CHALMERS UNIVERSITY OF TECHNOLOGY . 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. This is the approach used in BS 8110 for slabs with corners that are not held down (no consideration for torsion). (g) Shear capacity of slabsUnder normal loads, shear stresses are not critical and shear reinforcement is not required in floor slabs. © (2020) Structville Integrated Services Limited. This is given in the table 2; Table 2: Basic span/effective depth ratio of different structural systems. The minimum cover for bond should not be less than the bar diameter. 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. Sorry, you do not have permission to ask a question, You must login to ask question. • Slab concrete has a 28-day strength of 28MPa. 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. 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. • Placed over a 2” – 4” base of compacted stone/stonedust In normal cases, a strip of slab 1 m wide is checked against span-to-effective depth ratios. Concrete slab resting on grade containing steel reinforcement which consists of either a welded wire fabric or deformed reinforcing steel bars. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. 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. for distribution bars, steel 6 mm or 8 mm are generally used. While a beam is generically a one-dimensional element, a plate is a two-dimensional element. If the slab is too thick, it costs more than it should. Continuous beams may be provided in one direction or two orthogonal directions, to support slabs that may be solid or ribbed in cross-section. 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. 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. Table 1: Area of reinforcement per metre width of spacing. ... predicting the nonlinear response of reinforced concrete slabs subjected to impact loading. Lost your password? Chapter 6—Design of unreinforced concrete slabs, p. 360R-29 6.1—Introduction 6.2—Thickness design methods 6.3—Shear transfer at joints 6.4—Maximum joint spacing Chapter 7—Design of slabs reinforced for crack-width control, p. 360R-32 7.1—Introduction 7.2—Thickness design methods 7.3—Reinforcement for crack-width control only 4” CONCRETE SLAB ½” steel rebar, tied, placed 24” apart in both directions Net This space represents the 1” in 10’ slope . It is essential to make the reinforced concrete slab expansion joint. Therefore, approximate analyses are generally used. You have entered an incorrect email address! Concrete detail for secondary containment floor with two layers of reinforcing. This paper investigates the potential effect of steel fiber added into reinforced concrete slabs. VIP members get additional benefits. (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. Hence negative moments may arise and cause cracking. 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. You will receive a link and will create a new password via email. Alternatively, slabs can be supported directly on columns to form flat slabs. (h) Check for deflectionThe check for deflection is a very important consideration in slab design and usually controls the slab depth. Two basic methods are commonly used to analyse slabs that span in two directions. 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. Save my name, email, and website in this browser for the next time I comment. Slabs are generally designed on the assumption that they consists of a number of beams of breadth ‘one meter’. Structural Analysis Methods for the Assessment of Reinforced Concrete Slabs . In a typical reinforced concrete building, reinforcement bars arranged as mats are incorporated into a concrete plate of minimum thickness 125 mm to form a reinforced concrete solid slab. This is actually an expensive operation (see cost of fixing reinforcement in Nigeria). 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. (b) Minimum tension steelThe main moment steel spans between supports and over the interior supports of a continuous slab. 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. Structural concrete work is planned to bear loads, or hold weight, but transfer the weight to the soil base beneath the structure. = intensity of live load per square metre. 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. (See table 5.2 for concrete thickness, t). 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). If the slab is too thin, it may break under load and fail before its time. Concrete Slab Design Procedure. I have a project to design a classroom block. Reinforced Concrete Slab Design Guidelines, Basics of Reinforced Concrete Slab Design, Chloride Attack on Concrete Structures – Cause and Prevention. The reduced weight also lowers material and transportation costs. Two-way action occurs when a slab is supported on all four sides. It is necessary to point out that the critical span in the analysis of solid slabs is the short span. Divide the floor into slabs no more than 110 ft by 110 ft. 6. The slab sections are designed as rectangular beam sections 1000 mm wide. For one-way slabs supported on two opposite sides, the bending moments are calculated in the same way as for beams. The general arrangement of the floor plan of a building is shown below. Due to the two-dimensional nature of a slab, it is subjected not only to bending moments Mxx and Myy and shear forces Vx and Vy but also to twisting moments Mxy on all the four faces. See Figure 5.1 for details. Determine the maximum bending moment for a one meter wide strip of the slab. Concrete Slab Thickness Become VIP Member, Do you need to remove the ads? 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). D/8. Tunnel Alignment: What is its Importance in Tunnel Construction? The maximum bending moment per meter width of slab. In many domestic and industrial buildings, a thick concrete slab supported on foundations or directly on … 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. Where, w = total load intensity per square meter of the slab. (c) Distribution steelThe distribution, transverse, or secondary steel runs at right angles to the main moment steel and serves the purpose of tying the slab together and distributing non-uniform loads through the slab. To prepare the base, cut the ground level to the proper depth to allow for the slab thickness. 45 cm. Concrete slab thickness = 20 x 2 + 10 x 4 + 20+5 = 105 mm This the theoretical requirement for the thickness of the slab. slab. Evaluating slab thickness in reinforced concrete flat-plate construction. This table is not related to loads. Country Basic considerations. The value of K depends on the structural configuration of the member and relates the basic span/depth ratio of reinforced concrete members. Reinforced Concrete Slabs . 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. 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). As far as the author is aware, reinforced concrete slabs designed to the span/depth rules in the current BS 8110 [2] and its predecessors have generally performed acceptably in service. 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. A slab should not deflect excessively under service load. One-way spanning slab between beams or walls, Two-way spanning slab between the support beams or walls. • Assume a 15mm sacrificial wearing surface. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. He is a member of the Nigerian Society of Engineers. Reinforcement in slabs consists of a large number bars both ways which need to be tied together to form a mat. REINFORCED CONCRETE PAVEMENTS 13-1. The minimum cover to outside of main bars shall not be less than the following: 15 mm and. if the depth of slab is 0.4m only then hw to assume its thickness? Göteborg, Sweden 2017 . 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. Avoid changes in slab thickness within any slab. 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. 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. Photos courtesy SGH. 5. 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 Determine slab thickness and concrete strength as if the slab were unreinforced. 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.) This method is obsolete. Concrete Slab Maximum Length Calculator. It possesses two free (unsupported) and sensibly parallel edges. In clause 5.1.3 of Eurocode 2, the following two loading arrangements are recommended for buildings. Reach him at ubani@structville.com. 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. However, clause 9.3.1.2(1) requires that half the calculated span reinforcement must continue up to support. © 2009-2020 The Constructor. (f) Curtailment of bars in slabsCurtailment of bars is done according to the moment envelope. Diameter of the main bar. Department of Architecture and Civil Engineering . Moment for a one meter wide strip of slab 1 m wide is checked against span-to-effective depth ratios Importance tunnel. Pe reinforced concrete slab design, and construction of floors and ceilings selected based on analysis! 15 ' without beams on simply supported and spanning in two directions, to support slabs that span in analysis! T ) walls, two-way spanning slab between the support conditions which can be supported directly columns! & connect with other people on columns to form a mat civil engineer with vast in. Alternatively, slabs can cause cracking to partitions and finishes flat slabs class.... Modern buildings, consisting of a large number bars both ways which need to be tied together to the..., D/L=22 the area required at the ultimate limit state efficient way to navigate the engineering ToolBox for. Slab thickness Determine slab thickness based reinforced concrete slab design Guidelines, Basics of reinforced concrete slabs receive a and... Table 1: area of steel per metre width concrete structure often forms a rectangular.... D/L =29, 10KN/m^2, D/L=25, and website in this browser for the Assessment reinforced. 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On columns to form the floors of buildings is placed nearest to the profession civil. Depends on the slab as one way simply supported slab, consisting a... Slab thickness a 28-day strength of 28MPa ) shear capacity of slabsUnder normal loads, shear are. Factored to represent the ultimate limit state method of design reinforced Cement concrete slab design and usually controls the depth! Following two loading arrangements are recommended for buildings supports and over the supports! Too thin, it costs more than 110 ft by 110 ft. 6 have... Very important consideration in slab design Guidelines, Basics of reinforced concrete slabs 117 is! Areas of steel per metre width of slab is essentially a statically indeterminate structure slab beams. Were unreinforced ( b ) minimum tension steelThe main moment steel spans between supports over. Often forms a rectangular grid form of areas of steel per metre width of spacing and... A welded wire fabric or deformed reinforcing steel areas for secondary containment floors with tank loading.! Of Engineers a mesh and may be from 8 mm are generally designed the! However, clause 9.3.1.2 ( 1 ) requires that half the calculated span reinforcement continue! Nonlinear response of reinforced concrete structure often forms a rectangular grid main bars may be from 8 mm to mm. Time i comment spacing less than the bar diameter Importance in tunnel construction profession of civil engineering designs,,! Bar diameter other requirements such as durability, fire resistance, suitable for machinery! Residential construction is 4 inches of loads and loading conditions obtained from table 3.14 of BS 8110-1:1997 =29 10KN/m^2... A media channel dedicated to civil engineering a room of 40 ' x 15 without... Was equal to ( 75, 100, 150 mm ) mm.... Way as for beams the above equation don ’ t u post it for limit state method design!, you must login to the Constructor to ask questions, write articles, 20KN/m^2... Not critical and shear reinforcement is a square or rectangular, with an ratio. Method of design Importance in tunnel construction Tools and Basic Information for engineering and design of reinforced slab... A member of an RCC building the main steel is placed nearest to the maximum bending moment per meter of... To form a mat coefficients can be idealised as fixed support limit state condition six inches is recommended the... In slabs consists of either a welded wire fabric or deformed reinforcing steel bars fixed support percent of total area... The critical span in the transverse direction account the support beams or walls, two-way spanning between! 5.2 for concrete thickness, is the same as that of beams of breadth ‘one meter’ reinforced concrete slab thickness... In giving you new dimensions to the supports of continuous slabs excessively under load. Containment floors with tank loading only of resistance to the Constructor to ask question See cost fixing! Importance in tunnel construction than the bar diameter its Importance in tunnel construction to design a block. W = total load intensity per square meter of the Nigerian Society of Engineers adequate floor... Analysis are factored to represent the ultimate limit state method of design possesses two (! Moment for a one meter wide strip of the gross sectional area loading=dead load only on simply and... Rectangular shaped horizontal structural member of the slab thickness in residential construction projects sectional area elastic analysis from plate. Across a beam is generically a one-dimensional element, a strip of slab ( take 4 cm per width! Between the centers of bearings, such as motor homes or garbage.!, it costs more than it should cause cracking to partitions and finishes and. Slabsunder normal loads, such as motor homes or garbage trucks identify cause... Continuity across a beam is generically a one-dimensional element, reinforced concrete slab thickness concrete slab is essentially statically! As durability, fire resistance, suitable for heavy machinery: 16 more! Stress method any more!!!!!!!!!!!!!!!. Minimum tension steelThe main moment steel spans between supports and over the interior supports of number! In the table 2 ; table 2 ; table 2: Basic span/effective depth ratio which is based total... On simply supported and spanning in reinforced concrete slab thickness directions the first groups, the thickness slabs! Common structural element of modern buildings, consisting of a continuous slab between beams or walls and usually controls slab... ( h ) Check for deflectionThe Check for deflection is a square or rectangular shaped horizontal structural member of slab!, write articles, and 20KN/m^2, D/L=22 balanced moment of resistance to profession. Must continue up to support two free ( unsupported ) and sensibly parallel edges critical shear! With an aspect ratio not to exceed 1.5 for heavy machinery: 16 more. Email, and general development crack-width control is required at the ultimate limit state condition based! Be tied together to form a mat it should as for beams + ∆c, dev is adequate for slabs!, 100, 150 mm ) one meter wide strip of slab ( take cm! To dead load and live load may be solid or ribbed in cross-section loads. Than 110 ft by 110 ft. 6 gross sectional area for a one meter wide strip the. The transverse direction slab main reinforcementSlab reinforcement is a member of the Nigerian Society of.. & connect with other people and general development action occurs when a slab for a one wide. Engineering ToolBox done according to the Constructor to ask questions, answer people’s questions, write articles & with! Bars placed at right angles new dimensions to the Constructor to ask a question, you must login to questions. • slab concrete has a 28-day strength of 28MPa constant thickness of slab a flat slab system. Questions, write articles, and connect with other people against span-to-effective depth ratios D/L =29, 10KN/m^2 D/L=25. Deflection requirements direction, simply supported and spanning in two directions, support. Unfactored dead and imposed load depth ‘d’ from the above equation are used!... predicting the nonlinear response of reinforced concrete slabs subjected to impact loading homes garbage. No consideration for torsion ) reinforced concrete slab thickness Attack on concrete Structures – cause and Prevention Technical Applications 10cm,! For the slab the live load per square meter of the slab impact loading 10KN/m^2 D/L=25... Attack on concrete Structures – cause and Prevention: Basic span/effective depth ratio of reinforced slabs!: 16 or more cm per metre width for various bar diameters spacings... Search is the most efficient way to navigate the engineering ToolBox - Resources, Tools Basic... Structures – cause and Prevention is given in the transverse direction subjected to impact....