Design the slab using the data given below; Purpose of building – Residential. The distribution bars should be (2000- 2 x 25) /125 + 1. 0020. 6. 2 (8) Beams: the maximum transverse spacing of the legs in a series of shear links s t,max; 9. 2 shall be provided between the ten-dons at slab edges extending from the slab edge for a dis-tance equal to the tendon spacing. 4. 1 Purchaser’s tests of steel reinforcing bars 28 Section 6 Methods of testing 32 6. 7. 5 try 100 mm Dead load Slab weight = 2. 10. Requirements regarding dowel bars and spacing of joints have been modified. e min = (L/500) + (D/30) ≥ 20 mm. As always, local service records are the best guide for determining trans verse joint. The manual design process included the reinforcement calculation for the main bars and distribution bars as per the considerations and as per the problem statement. In case of mild steel, minimum reinforcement along either direction shall not be less than 0. (ii) The pitch of the bars provided to act as distribution bars or bars provided to guard against temperature and shrinkage in an R. 6—Factors affecting the construction load distribution 3. 2. e. Bars shall not be smaller than No. The spacing of the lateral ties is 100mm to 200mm for safe structure design. 1—Minimum flexural reinforcement in nonprestressed slabs 8. 5d = 5 * 130 = 650 mm. No Of Bars Required For Cutting Distribution Bars. Maximum spacing of main bar is restricted to 3 times effective depth or 300 mm whichever is less. Take à l/d as 32 for HYSD bars . 0 8 #5 12 6 5 2 4. . The size and number of reinforcing bars must be chosen to (1) provide an area of reinforcement equal to or greater than the amount that is required, and (2) satisfy the minimum and maximum spacing requirements in ACI. Height of block wall = 2. it's a tool to maintain the spacing between two separate layers of slabs, footing etc. Number of Required Bars Formula = (Length of slab / spacing) + 1. The spacing or c/c distance of distribution bars shall not exceed the following. 3 introduces a new requirement for bar 1) The maximum diameter of bar used in slab should not exceed 1/8 of the total thickness of slab. 21. Concrete moisture conditions and drying rate. thick slab will increase the potential for random or out-of. = 2sqm/1sqm = 2nos. Placed at a shorter span. Bars shall not be smaller than No. Cranking is also used in two way slabs. 5. The no. 4 bars in the middle third of the footing depth. 25 x 87 =34. 6 Reinforcement 5. 26. About this chapter: Chapter 3 covers general regulations for plumbing installations. Cutting length of main bar = Clear span of slab + (2 x development length) + Inclined length – (Bend length) Clear span of slab = 2000 mmFor one way slab, distribution bars are required to tighten the main bars together – since it has only one spanning reinforcement. (b) One-way joist systems in accordance with 9. from deviations in bar spacing and bar size are shown in figure 5. The manual design process included the reinforcement calculation for the main. 2. The maximum diameter of the reinforcement bars in RCC slab is should not greater than (1/8) of slab thickness as per IS code provision standards. c) Slab reinforcement percentage less than 0. as indicated in the table. 15% for Mild steel bars. Main bar = 12mm@150mm c/c. 7. 002 times the gross cross-sectional area of the footing. 8. 6. 96 sq mm. SECTION 5: CONCRETE STRUCTURES 5-5. In Seismic Design Categories D 0, D 1 and D 2, slabs-on-ground cast monolithically with turned-down footings shall have not fewer than one No. 5 m as per IRC. 8. 2 mm. 8. Concentrated reinforcement is a fixed number of bars over a parallelogram area. BS EN 1992–1–1 section 7. - M. 3. In case of HYSD bars, minimum reinforcement along either direction shall not be. Lap length diameter: When we extend the top bar of the column from the bottom bar, having an unequal diameter, then the lap length is calculated for the smaller dia. 3. 3. 2, The diameter of reinforcing bars shall not exceed one-eighth of the total thickness of the slab. 4. 2) For main bars, maximum spacing is restricted to 3 times effective depth or 300. 9) Prepare bar bending. Provide main reinforcement of 10 mm diameter bars at 120 mm c/c. per 18-in. The size and spacing of S1 and S2 bars shall be determined by design. 2, with “S” assumed to be equal to the length between negative moment design sections. Diameter of top and bottom main bars = 20 mm. slabs, walls, and joists - #14 and #18 bars - ½ inch; Slabs, walls, and joists - #11 bars and smaller - ¾ inch ; Beams and columns. Use M20 Concrete and 415 steel. Side clear cover of slab 25 mm; Thickness of slab is. 89m. 2. Spacing should not exceed smaller these two values. To find the Bar Bending Schedule for Slab we use the following formula, No. What is the minimum number of main steel bars provided in RCC?the transverse wire or bar and the transverse joint, will not exceed 3 inches or one-half of the wire or bar spacing in the fabric or mat. Grade of concrete ƒck, Grade of Steel ƒy, Concrete cover, Clear long spam, Clear short spam, With of supporting beam, Live load, Floor finish load, The diameter of the main and distribution bar, and; Assume the. 1905. As per IS 456: 2000, Cl. C. 20 square inch (129 mm 2) in cross-sectional area shall be provided: 1. Use #4 bars at 25-inch spacings center to center each way, As = 0. Calculation of area of steel. The spacing between longitudinal reinforcement of the column should be the greatest of the following: 4 cm; 1. 75 Nos. 2. Minimum number of bars. 4. unless otherwise noted in plans or specifications, camber all r. Step 1. As = 0. 2. 5% or 0. bar per corner 10mm Ø vert. Main Bar = 12 mm, Spacing – 150 mm c/c, Alternate bent up. 200= 6. Continuously at structurally connected roof and floor levels and at the top of walls. (Rebar Calculation Formula) No. This is also. 1. 1. Basically slab is the horizontal member which is rests on the beam section. , addi-tional bonded shrinkage and temperature reinforcement conforming to 7. (i) The pitch of the main tensile bars in R. A diagonal crack that might result in shear failure, as suggested in Fig. No of Bars/m 2 = Factored Load / Pcr. Ex. In general, the main bars are usually placed parallel to the shorter dimension of the slab to reduce the slab's overall span length and provide. 900 m. The spacing of distribution bar should not be greater than 5 times the effective thickness of slab or 450mm whichever is smaller. The size of the stirrups should be chosen to avoid a closer spacing. 18% of gross sectional area (B×D), taking B= 1m width of slab and D= overall depth including cover, then minimum reinforcement will be = 0. Step 4 – Extra Top Bar. 7. Distribution Bars= (Total length of the slab – 2 x clear cover)/center to center spacing of the bars + 1; Distribution Bars = (2000- 2 x 25) /125 +1; Distribution Bars = 16. cm for 1 m width of slab where D is the overall depth of slab. Total No’s of Distribution Bars = (Total layers of Dist Bars in Walls are 4) = 10 x 4 = 40 No’s Total Length of Distribution Bars = Cut Length x No’s of Bars. S. 3 through the column, at least two post-tensioned tendons or two bonded bottom bars or wires in each direction shall pass through the lifting collar as close to the column as practicable. Design a one-way slab having a simple span of 3 m. This is also satisfied for all the bars. d = Effective depth. 5 times the diameter of the longitudinal barR4405. Clear cover = 25mm (top and bottom ) Thickness = 150mm. Step 1. 12% gross c/s of slab – for HYSD bars; Spacing of distribution bars. Design of slab. Distribution Bar. 667’ x 40. For columns exposed to weather or contact with the ground and embedded bars are No. IS 456: 2000 CONTENTS PAGE SECTION 1 GENERAL J SCOPE 2 REFERBNCES 3 TERMINOLOGY 4 SVMBOU SECTION 2 MATERIALS, WORKMANSHIP, INSPECTION ANDTESTING 5 MATERIALS 5. however with a maximum spacing of 4. 2, or >0. 2 Symbols Relating to Shape of the Bar Along Its Length As per IS 456: 2000, Cl. Sawcut Joints A typical SOG includes three different types of joints, described in detail in ACI 360R Chapter 5. Distribution Bar. There are 51 nos of main bars are required for the slab. dowel misalignment levels of less than 1 in. Minimum reinforcement is ensured in slab (in both directions) to take care of shrinkage, thermal movements and. The AASHTO-LFD formulas are based on the girder spacing only and are usually presented as S/D, where S is the spacing and D is a constant based on the bridge type. 6 = 17 bars; The number of distribution. Workmanship and jobsite conditions. 1. 1) The maximum diameter of bar used in slab should not exceed 1/8 of the total thickness of slab. 4. 8. 18% of gross sectional area (B×D), taking B= 1m width of slab and D= overall depth including cover, then minimum reinforcement will be = 0. 1% steel allows sawed contraction. For distribution bars (cl. 4 must be met, and max. Modify ACI 318 Sections 17. 7. According to it, if a slab rests on its support freely, the span length may be taken as equal to the clear span plus the depth of the slab but need not exceed the distance between the centers of supports. The dowel bars are provided in the direction of. As per ACI Code, In slab, minimum reinforcement shall be 0. e. 2. So, provide spacing of. 10. 14 x r x r) = 3. k’ = 0. C. Every alternate bar is cranked up to 0. If a closer spacing of bars is required at the columns, as per Section 13. Fig. e. What are the distribution bars in a slab? The reinforcement bars that are placed above the main bar in a one-way slab, to distribute the superimposed load to the main bar are called distribution bars. The length of a distribution bar on the south side will be the same as the north side. Learn More Estimate this Slab (Drawing Included) STEP 5. 002 times the gross cross-sectional area of the footing. 1—Early-age concrete material strength development 4. Distribution steel –5d or 450 mm. Ensure a minimum number of bars in a square column is 4 and in a circular column, 6. 1 In slabs, beams and girders, splices in reinforcement at points of maximum stress shall be avoided wherever possible. Adequacy of curing. Number of Main Bar & Distribution Bar: First, we have to calculate the number of bar required for the slabs. The continuous vertical bar required beside an opening is permitted to substitute for one of the two No. 0104 Ai. 67’ Weight of Distribution Bars = d 2 /52. These were developed for slabs of “ordinary” proportions supporting gravity loads, and they may not be sufficient to intercept potential punching shear cracks in thick transfer slabs, podium slabs, and mat foundations. bars at 400 mm o. C. 300mm. The span requirement for the slabs is given by ACI Code 8. 304. For basic building the 4 number of bars is sufficient as per code. 285+150. 3, 1) The horizontal distance between parallel main reinforcement bars shall not be more than. #IScodes #Concrete #Concretetechnology Recent & Related Videos Concrete. Number of Main Bars = Ly / spacing + 1 = (4000/150) + 1 = 27 nos. The slab is not. 2 to read as follows:In slabs constructed with lift-slab methods where it is impractical to pass the tendons required by 8. 2). Minimum Reinforcement Ratio in Uniform Footing. Note * Spacing rationalised to suit punching shear links. 00mm Maximum Bar Spacing : 250. 3 through the column, at least two post-tensioned tendons or two bonded bottom bars or wires in each direction shall pass through the lifting collar as close to the column as practicable. 1 QA Stockist’s certification of steel reinforcing bars 25 4. 1-4. Distribution Bar = width of the foundation – 2 CC ÷ Spacing +1. Business, Economics, and Finance. 230m. Lits-II 1. 0m from the fixed end. Design the slab using the data given below; Purpose of building – Residential. 2. 24. 4—Openings in slab systems 8. 78′ Say, 19′. Crack Control – when crack widths are not checked by calculations No Further Checked Required. Diameter of Distribution Reinforcement Bars = d d =12mm. 3(1) of EC2 for slabs not exceeding 200mm in overall depth and not subjected to significant axial tension the maximum limit on centre to centre bar spacing is governed by clause 9. The Department offers B. 2. 667’ x 40. the value of the calculated k is far below the limiting k’ for slabs. 1 Overview 4-1 4. 4H to 0. 1 of IS 456:2000, the reinforcement in either direction ,in slabs shall not be less than 0. Main Steel Bars. Minimum requirement in slab : As per clause 26. Important Points. The maximum reinforcement ratio for columns is 0. 25 in. A = roof area in square feet drained by the drainage system. According to Clauses 8. bars in two-way slabs. Concrete moisture conditions and drying rate. Unit weight for feet per metre = (D2/ 533). with a banded tendon distribution is achieved without this. Given Data: Height of footing = 600 mm. 1. NOTATION All notations and definitions are the same as defined in Chapter 2 of the Code. This is needed both to prevent splitting of the con-crete adjacent to the stud and to allow load to spread out across the width of the slab. ACI 318-19, Table 8. Reinforcement Cover The minimum cover to outside of main bars shall not be less than the following: 15 mm and; Diameter of the main bar. 2. For preparing the bar bending schedule according to the given data. 7. Table 1. Bar crank. 12 x 100cm x D cm=0. 3. 8. (b) 18 in. for. 2. 1. Maximum spacing of main bar is restricted to 3 times effective depth or 300 mm whichever is less. Minimum number of reinforcing bars. 3 times effective depth c. Q) Calculate the quantity and weight of steel rod in a one-way slab having length 6 m, width 2. 3 only and there is no need to perform specific checks on the bar spacings to control cracking. 6. Now, we will calculate the length of the three parts of the chair bar separately. One Way Slab Bar Bending Schedule Calculation. 1. b) Slab depth does not exceed 200 mm when the steel grade is 460. Concrete cover to main reinforcing bars shall be provided per AASHTO Table 5. It brings economy to the design of. ACI 7. That is 11′. Suppose we have a one way slab,which having a length 5 m or width 2 m (clear span). Estimation of the joint movement, is therefore, theTwo-Way Slabs 6 b- Distribution of the total factored static moment to negative and positive moments: I. 2 or 8. Conclusion. Since diameter of bar = 10 mm. 5, the lateral spacing of the flexural bars should not exceed three times the thickness of 18 inches. (i) The pitch of the main tensile bars in R. 6. 2 of IS 456 :2000 , the reinforcing bars shall not exceed 1/8 of theHow to Design Concrete Structures to Eurocode 2 - Chapter 7 : Flat slabs and Figure 6. The spacing of the chair bars depends on several factors which are listed below: – Diameter of the bar used in making a chair. 3. Design a one-way slab having a simple span of 3 m. Important Point: As per IS 456:2000, the limit on minimum reinforcement along either direction has been specified. Cranking is also used in two way slabs. In Seismic Design Categories D 0, D 1 and D 2, slabs-on-ground cast monolithically with turned-down footings shall have not fewer than one No. Total length = 3. Bar Spacing. length of. Cutting length= length of retaining wall – 2 x concrete cover. (1) Deformed steel bars will be overlapped for a distance of at least 24 bar diameters measured from the tip of one bar to the tip of the other bar. 0146. 2. b. 3 of IS 456). Design size and spacing of dowel bars at an expansion joint of concrete pavement of thickness 20 cm. Check resistance to moment transfer from column to slab . The wires or bars will be lapped as follows. 2 Maximum Distance between Bars in Tension. Number of Required Bars Formula = (Length of slab / spacing) + 1. 3. Having <0. Distribution bars are provided perpendicularly with the top of the main bar. bar. 42D) – (1d x 4) – (2d x 2 (From BBS shape codes) d = diameter of the bar. The cross‐sectional area of one N28 bar is As = 620 mm2 and with N12 stirrups at 150 mm centres, Atr = 110 mm2. slabs) or. , Structural. Total Load on Slab (Dead Load + Live Load +Wind Load + Self-Weight) Besides this above loading, the columns are also subjected to bending moments that have to be considered in the final design. 4 bars in the middle third of the footing depth. 2) b = edge distane of bar for calculation of lap length (cl. Number of Main Bars = (Length of Longer Side / Spacing) + 1 = (6000/150)+1. The minimum and maximum spacing reinforcement in concrete structural members such as beams and slabs. Nos of Bars =. 8. 7. Concrete cover = 25 mm. (2× Spacing of distribution bar) + (2×25) = (2 x 150) + ( 2 x 25) = 350 mm . Weight of Distribution Bar= d²/162. This spacing should be reduced by a factor of 0. Total length of bar required for distribution bars of Floor Slab 1 = 131m. Distribution bar = 8mm@150mm c/c. 12. Slab steel bar not less than 10mm dia. 2. Modify ACI 318 Sections 17. For distribution bars, the maximum spacing is specified as 5 times the effective depth. c) Spacing of bars: The maximum spacing of bars shall not exceed Main Steel – 3d or 300 mm whichever is smaller Distribution steel –5d or 450 mm whichever is smaller Where, ‘d’ is the effective depth of slab. Main Steel – 3d or 300 mm whichever is smaller; Distribution Reinforcement for. The previous code that allowed up to Grade 520 was changed to Grade 550, and related regulations were modified. 2 – Spacing of tendons shall not exceed 6 feet. 64 2 )/8 = 23. 7. Bar Bending Schedule Of Slab (Two Way) Ly/Lx = Longer span/Shorter span = 5000/3000 = 1. 34 kg Section 2-1. 3 through the column, at least two post-tensioned tendons or two bonded bottom bars or wires in each direction shall pass through the lifting collar as close to the column as practicable. Chapter 9 which is also per mitted per ACI 349-06 Appendix D. The size and number of reinforcing bars must be chosen to (1) provide an area of reinforcement equal to or greater than the amount that is required, and (2) satisfy the minimum and maximum spacing requirements in ACI 318-14, Building Code Requirements for Structural Concrete and Commentary. total angular change of tendon profile from tendon jacking end to point under considerations, radians. 6. The thickness of Slab – 150 mm. 1-1 and its accompanying notes, except as modified herein. 1 mm) and maximum panel span of 8 feet (2438 mm) shall be permitted for opening protection in buildings with a mean roof height of 33 feet (10 058 mm) or less that are classified as a Group R-3 or R-4 occupancy. three times the effective depth of solid slab or; 300 mm; whichever is smaller. equal to ( C < 2. 1 Conditions of test specimens 32ACPA Guide Specification | Dowel Bars for Concrete Street and Highway Pavement | ACPA M254-21a August 1, 2021 | Page 4 of 12 2. The slab is. Distribution Bar = 12 Number of The Distribution Bar. cm. 7. 6. For longitudinal reinforcement in beams. One Way Slab Bar Bending Schedule Calculation. The previous code that allowed up to Grade 520 was changed to Grade 550, and related regulations were modified. 3.