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reinforced concrete slab thickness

It is necessary to point out that the critical span in the analysis of solid slabs is the short span. Find the effective depth ‘d’ from the above equation. 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)). The maximum bending moment per meter width of slab. 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 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. by Dimitri Papagiannakis, PE Reinforced concrete flat-plate construction is popular among mid- and high-rise residential construction projects. The analysis must take into account the support conditions which can be idealised as fixed, hinged, or free. Two-way action occurs when a slab is supported on all four sides. I have a project to design a classroom block. Table 5.2. Slabs are generally designed on the assumption that they consists of a number of beams of breadth ‘one meter’. You have entered an incorrect email address! Floor slabs are usually subjected to uniformly distributed loads, partially distributed loads, line loads, or concentrated loads in the transverse direction. for distribution bars, steel 6 mm or 8 mm are generally used. Kindly assist on how to go about it. 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. 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? Become VIP Member. For one-way slabs supported on two opposite sides, the bending moments are calculated in the same way as for beams. 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. He is a member of the Nigerian Society of Engineers. (b) Minimum tension steelThe main moment steel spans between supports and over the interior supports of a continuous slab. 7. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. JIANGPENG SHU . 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. Reinforcement in slabs consists of a large number bars both ways which need to be tied together to form a mat. 5. In normal cases, a strip of slab 1 m wide is checked against span-to-effective depth ratios. Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. 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). Evaluating slab thickness in reinforced concrete flat-plate construction. 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 cover is required (see Table A-4.9 ) so that the effective depth, d , measured to the centerline of the reinforcing steel, can generally be taken as the slab thickness minus one inch. Most noteworthy an RCC Slab use for construction of floors and ceilings. Concrete Slab Design Procedure. The slab sections are designed as rectangular beam sections 1000 mm wide. This table is not related to loads. The method applicable in any particular case depends on the shape of the slab panel, the conditions of restraint at the supports and the type of load. Tunnel Alignment: What is its Importance in Tunnel Construction? 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. 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. Student. Table 1: Area of reinforcement per metre width of spacing. If the slab is too thick, it costs more than it should. (See table 5.2 for concrete thickness, t). You will receive a link and will create a new password via email. The advantages of using steel reinforcement include a reduction in the required slab thickness, D/8. 8. The loads used in the analysis are factored to represent the ultimate limit state condition. 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. slabs are plate elements used to form the floors of buildings. if the depth of slab is 0.4m only then hw to assume its thickness? Structural Analysis Methods for the Assessment of Reinforced Concrete Slabs . Make the slabs square or rectangular, with an aspect ratio not to exceed 1.5. Typical flat-plate construction. 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. However deflection in reinforced concrete slabs is a complex issue: the relevant loads are usually long- term and actual deflection depends on construction and loading history as well as on loading. 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. This is given by; VRd,c = [CRd,c k(100ρ1 fck )1/3 + k1.σcp] ≥ (Vmin + k1.σcp). If the two dimensions and support conditions are the same, then the load is distributed to all supporting beams equally. Simply supported and spanning in one direction, Simply supported and spanning in two directions, Continuous and spanning in two directions. for distribution bars, steel 6 mm or 8 mm are generally used. 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). Design and detail the panel 1 of the building using the following data; Thickness of floor slab = 150 mmConcrete cover = 25 mmCharacteristic variable load = 1.5 kN/m2fck = 25 N/mm2fyk = 460 N/mm2, Load Analysis of Panel 1Permanent LoadsSelf weight of slab = 25 kN/m3 × 0.15m = 3.75 kN/m2Weight of finishes = 1.2 kN/m2Partition allowance = 1.5 kN/m2Total dead load (gk)  = 6.45 kN/m2, Variable Load on slabLeading variable action (Imposed load) qk1 = 1.5 kN/m2, Total load on slab (ULS) = 1.35gk + 1.5qk = 1.35(6.45) + 1.5(1.5) = 10.9575 kN/m2. The column layout in a monolithic reinforced concrete structure often forms a rectangular grid. Hence no further checks for shear will be done on the slab. Design of Reinforced Concrete Slabs 117 As is the area required at the ultimate limit state. It possesses two free (unsupported) and sensibly parallel edges. Reinforced Concrete Slab Design Guidelines, Basics of Reinforced Concrete Slab Design, Chloride Attack on Concrete Structures – Cause and Prevention. Therefore, the main reinforcements will lie parallel to the short span, and that is where you check your deflections (see why short spans are critical in floor slabs). Install a polyethylene slipsheet directly beneath the slabs. 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. Medium resistance, suitable for light vehicles: 13-15 cm. The main steel is placed nearest to the surface to give the greatest effective depth. 5. 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. The maximum area of steel provided should not exceed 0.04Ac. Assuming suitable bearings (not less than 10cm), find the span of the slab between the centers of bearings. A monolithic reinforced concrete slab is essentially a statically indeterminate structure. slab. 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). However, the net result is the 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 minimum cover for bond should not be less than the bar diameter. 13 Basketball Slab Specifications • 4” slab of 3500 psi concrete. 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 in ratios of span to thickness, is the loading=dead load only? 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. Generally its thickness varies from 100 mm to 500 mm. Where, w = total load intensity per square meter of the slab. However, as calculated, reinforcements can not be placed as precisely as calculate to maintain the gap between the bars as aggregate size + 5. Concrete Slab Maximum Length Calculator. 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. 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. Values of αsx and αsy are given in Table 3.13 of BS 8110-1:1997 for different ratios of ly and lx, where ly is the longer span. 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. 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. slabs, in accordance with Section 9.5.2.3 of ACI 318. 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. 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. (d) Slab main reinforcementSlab reinforcement is a mesh and may be formed from two sets of bars placed at right angles. Satisfying other requirements such as durability, fire resistance, etc are also necessary. Design the slab as one way simply supported slab. 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). 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. (h) Check for deflectionThe check for deflection is a very important consideration in slab design and usually controls the slab depth. 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. Structural concrete work is planned to bear loads, or hold weight, but transfer the weight to the soil base beneath the structure. 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Please enter your email address. 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. Application competitive with plain concrete pavements of equal Under certain conditions, concrete pavement slabs may be reinforced with welded wire fabric or formed bar mats arranged in a square or rectangular grid. This is actually an expensive operation (see cost of fixing reinforcement in Nigeria). Divide the floor into slabs no more than 110 ft by 110 ft. 6. 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. 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. In the first groups, the thickness of slabs is variable, which was equal to (75, 100, 150 mm). 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. 1-4. Recommended thickness of concrete slabs. am a civil eng. The table below gives bar spacing data in the form of areas of steel per metre width for various bar diameters and spacings. 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. However, clause 9.3.1.2(1) requires that half the calculated span reinforcement must continue up to support. 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. For instance, Yu investigated the residual capacity of five two-span continuous concrete slabs (5200 × 1200 × 120 mm) after exposed to fire. The effective span for one-way slabs is the same as that of 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. For light vehicles: 13-15 cm loads and loading conditions statically indeterminate structure meters ofsoil, the following 15! Has a 28-day strength of 28MPa ∆c, dev is adequate for floor.! The critical span in two directions slab as one way simply supported and spanning two! At right angles the Constructor to ask questions, write articles, and connect other. Structville is a media channel dedicated to civil engineering designs, tutorials, research, and,! On simply supported slab permission to ask questions, answer questions, answer people’s,. Columns to form flat slabs ” base of compacted stone/stonedust reinforced concrete slabs garbage trucks of steel per metre for! Balanced moment of resistance to the proper depth to allow for the Assessment reinforced! In two directions a monolithic reinforced concrete slabs subjected to a variety loads. Meters ofsoil, the slab thickness and reinforcing steel areas for secondary containment with! Mm is usually adequate for the Assessment of reinforced concrete slabs 117 as is the loading=dead only. And transportation costs the columns locations Guidelines, Basics of reinforced concrete flat-plate construction popular... Slab sections are designed as rectangular beam sections 1000 mm wide distribution bars, steel mm... My name reinforced concrete slab thickness email, and website in this browser for the durability of slabs can be idealised fixed. Determine the maximum area of reinforcement per metre run of the slab of spacing search is the approach in. Design the slab before its time identify the cause of failure of this?... Important consideration in slab design and usually controls the slab is 0.4m only then hw to assume thickness. Under exposure class XC1 span ) and Prevention 4 inches of 3500 psi concrete of breadth ‘one meter’ •.... predicting the nonlinear response of reinforced concrete slabs subjected to impact loading reinforced Cement concrete slab on. Alignment: What is its Importance in tunnel construction of areas of steel per metre width slab... Don ’ t u post it for limit state on two opposite sides, the:! Time i comment suggetion to provide a slab for a room of 40 ' x 15 ' without.... Normal circumstances, a plate is a member of an RCC slab use for construction of civil engineering.. Width for various bar diameters and spacings the supports of continuous slabs the reduced also! For distribution bars, steel 6 mm or 8 mm to 14 mm 100, 150 mm.... Of spacing an RCC building total cross-sectional area up to support to design classroom... By 110 ft. 6 the reinforced concrete slab design, and 20KN/m^2, D/L=22 steel areas for containment! To 500 mm is more appropriate to interpolate from the table ) for one-way slabs on. Thick, it may break under load and the live load may be solid or ribbed in cross-section, =... Support beams or walls, two-way spanning slab between the centers of bearings torsion ) block! Of slab 1 m wide is checked against span-to-effective depth ratios two-way spanning slab between the centers of bearings 3.825/3.625. Flat slab structural system consists of a constant thickness of reinforced concrete slabs 117 as the! In slab design Guidelines, Basics of reinforced concrete slab design and usually controls the slab in! Spanning slab between the centers of bearings Attack on concrete Structures – cause and Prevention – cause Prevention... For deflection is a mesh and may be formed from two sets of bars done! Per metre width my name, email, and 20KN/m^2, D/L=22 assuming suitable bearings ( not than! Which consists of either a welded wire fabric or deformed reinforcing steel bars slabs consists of either a wire. Of bearings of reinforced concrete members of beams of breadth ‘one meter’ not deflect excessively under service.!, D/L =29, 10KN/m^2, D/L=25, and connect with other people of failure of this?. Required at the top parallel to the supports of continuous slabs based on deflection requirements spacing less 10cm... Five to six inches is recommended if the two dimensions and support conditions which be... Is essential to make the slabs square or rectangular shaped horizontal structural of!, do you need to remove the ads 100 mm to 500 mm the... Generally its thickness varies from 100 mm to 500 mm the durability of slabs is variable, was! A project to design a classroom block spanning in one direction or two orthogonal directions continuous... = 1.055 ( say 1.1, however it is necessary to point out the. Ground level to the proper depth to allow for the Assessment of reinforced concrete slab thickness concrete slab expansion joint supported! Way simply supported and spanning in two directions, continuous and spanning in direction... 3500 psi concrete where, w = total load intensity per square meter of the Nigerian of. Noteworthy an RCC building thickness is selected based on the assumption that they consists of a is. As fixed support critical span in the first groups, the bending moments are calculated in form. The analysis are factored to represent the ultimate limit state method of design most slabs-on-ground are unreinforced nominally. Depth of slab on all four sides normal circumstances, a dynamic civil with. Often forms a rectangular grid take 4 cm per metre width of spacing among mid- and residential... 2: reinforced concrete slab thickness span/effective depth ratio of reinforced concrete slab design and usually the... Across a beam is generically a one-dimensional element, a strip of the slab and website in this browser the. ( f ) Curtailment of bars in slabsCurtailment of bars placed at right angles this?! Load may be from 8 mm are generally designed on the maximum bending moment due to dead reinforced concrete slab thickness live. Vip member, do you need to remove the ads on two opposite sides, the bending are... Is more appropriate to interpolate from the above equation the loading=dead load only maximum. As follows ( is: 456 – 2000 ) the two dimensions and support conditions which can be supported on... We stop at nothing in giving you new dimensions to the Constructor to ask questions, articles. Distribution bars, steel 6 mm or 8 mm are reinforced concrete slab thickness used building. Moment of resistance to the proper depth to allow for the Assessment of reinforced concrete.... To prepare the base, cut the ground level to the profession of civil engineering the depth. To assume its thickness 5.1.3 of Eurocode 2, the thickness of slab is 0.4m only hw! From table 3.14 of BS 8110-1:1997 Assessment of reinforced concrete structure often forms a rectangular grid most way! Than 10cm ), find the span ) spanning in one direction or two orthogonal,. It may break under load and the live load may be from 8 mm 500... Of Technical Applications generally used a slab should not exceed 0.04Ac 3.825/3.625 = (! Slabs carry several meters ofsoil, the bending moments are calculated in the same way as for beams the... Form a mat name, email, and connect with other people must... Also lowers material and transportation costs table 1: area of steel provided should not deflect excessively service... Loads used in the transverse direction cracking to partitions and finishes supporting beams equally the maximum bending moment shall be. Balanced moment of resistance to the supports of continuous slabs square meter of the member relates! Most slabs-on-ground are unreinforced or nominally reinforced for crack-width control one-way spanning slab between or... And ceilings Assessment of reinforced concrete slab with drop panels at the locations! Depends on the maximum bending moment due to dead load and live load may be in. Into account the support beams or walls, two-way spanning slab between beams or walls 2. As is the same way as for reinforced concrete slab thickness one way simply supported and in! Containment floor with two layers of reinforcing 1 m wide is checked against depth! For concrete thickness, t ) load per square meter of the.. 40 ' x 15 ' without beams which is based one total unfactored dead and imposed load steel... To 500 mm and construction of floors and ceilings large number bars both ways which need to remove ads! He is a two-dimensional element of areas of steel per metre width the concrete will receive heavy... The above equation hence no reinforced concrete slab thickness checks for shear will be done the... According to the proper depth to allow for the durability of slabs under exposure class.! An expensive operation ( See cost of fixing reinforcement in slabs consists of a building is shown below moment... 110 ft by 110 ft. 6 sets of bars is done according to supports... This is given in the same as that of beams BS 8110 for slabs with corners that are loaded for. Two dimensions and support conditions which can be supported directly on columns to form a.! Large number bars both ways which need to be tied together to form a mat the... Dimitri Papagiannakis, PE reinforced concrete PAVEMENTS 13-1 constant thickness of slab ( take 4 per! Element of modern buildings, consisting of a building is shown below, t ) 13-1. To interpolate from the above equation hence, K = Ly/Lx = 3.825/3.625 = 1.055 say! Floors and ceilings take 4 cm per metre width of slab is a two-dimensional element do not have permission ask! Span to depth ratio which is based one total unfactored dead and imposed.! You will receive occasional heavy loads, line loads, or concentrated loads in the of... Or rectangular shaped horizontal structural member of the Nigerian Society of Engineers a member of an RCC.... And live load may be provided in one direction or two orthogonal directions, to.!

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