, addi-tional bonded shrinkage and temperature reinforcement conforming to 7. 2. Only 2. Spacing = 150mm c/c as per given details = (2950/150) + 1 = 20. Main Steel – 3d or 300 mm whichever is smaller. Calculated area; 5 x d; 450mm; Diameter of bars. 5 bar is permitted to be located at either the top of the slab or bottom of the footing. 1-4. 1. 1. 8. 3. is for dowel diameters to be one-eighth of slab thickness, dowel spacing to be 12 in. For distribution bars, the maximum spacing is specified as 5 times the effective depth. 3. For distribution bars, the maximum spacing is specified as 5 times the effective depth or 450 mm whichever is smaller. Placed at a longer span. Compute number of steel bars. , Structural. 54 * 1000 / 180 = 436. 3. 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. 2Dead Load + 1. Fig. 67 m, the slab depth for the voided slabs ranged from 10 inches to 16. Step 1. to carry a uniform live load of 7500 Pa. 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. 31 of IS456-2000, the span by depth ratio of two way slab is applicable for flat slabs and the values can be (l/d)modified by 0. Total length of bar required for distribution bars of Floor Slab 1 = 131m. =Eq. bars at 400 mm o. This is also satisfied for all the bars. correct. 4 Slabs Spanning in Two Directions at RightAngles 24. Self-weight of the slab = 3. 2and3 C. Slab Thickness = 150 mm. 12. For longitudinal reinforcement in beams. Spacing of Main reinforcement bars = s m = 150mm c/c. Head ( E ): The length of the head = [(2nos. Near lapped joints, if the diameter of the longitudinal bar is greater than 14 mm. Two way slab building. What is the maximum spacing of a distribution reinforcement to be used in a one way slab as per IS 456? b. Minimum reinforcement is ensured in slab (in both directions) to take care of shrinkage, thermal movements and. 6—Factors affecting the construction load distribution 3. (ii) The pitch of the bars provided to act as distribution bars or bars provided to guard against temperature and shrinkage in an R. Head of Chair: Length of head = (2 * spacing of distribution bar) + (2 * 50) = (2 * 150) + (2 * 50) = 400mm. 2. is more that the diameters used here. If the reinforcing bars do not extend beyond the critical section. 5. Whereas, Factored Load = 1. Use bar support in order to maintain the space between bars at the top and bottom and then the distance will be correct. The minimum and maximum spacing reinforcement in concrete structural members such as beams and slabs are required as per standard codes. Here, ∅ is the bar diameter. So, we need to calculate the value of ‘D’. 1 of IS 456), the maximum spacing is the. 4 bar at the top and the bottom of the footing or one No. So, provide spacing of distribution bar equal to. 2. Maximum Spacing between Stirrups . 2 times effective depth b. The distribution bars should not be under 8 mm in a diameter or not in excess of 1/8 of the thickness of the R. b) For design of distribution bar/Transverse bar. 4, Chapter 10 ct = distance from the interior face of the column to the slab edge measured parallel to c1. Provided to resist the bending stress. 5 bar or two No. The length of a distribution bar in west side is the same as the east side. 2 or 8. 2. Breadth of Footing = Y = 1. 4. (c) Deep beams in accordance with 9. Suppose we have a one way slab,which having a length 5 m or width 2 m (clear span). 3. Design size and spacing of dowel bars at an expansion joint of concrete pavement of thickness 20 cm. 7. 2. Requirements regarding dowel bars and spacing of joints have been modified. 4. Table 1. (a) for a distance equal to the larger lateral dimension of the column above and below a beam or slab, andThe complete column design process as per IS code is determined by using below 3 basic formulas. 25 x total length of bar. bars at 400 mm o. 6. bending dimensions shall be measured as shown for appropriate standard shapes. EXAMPLE PROBLEM 1. continuous slab – code coefficients-. One Way Slab Bar Bending Schedule Calculation. 9, page 341. 9. Minimum distribution reinforcement steel (for TOR Steel) shall be 0. 2. c 0. , Chapter 12 c c = clear cover of reinforcement, in. If the maximum diameter for slab thickness is 75 mm, so the diameter of reinforcing bars should be 8 mm. Dia of Chair. Length of the Slab = 5 m = 5000 mm. The distribution bars’ primary function is evenly distributing the load across the slab. Note * rationalise centre of bars in column strips T2 and B2 to 175 mm centres to suit punching shear links. 2 of ACI 318-11, it should be clearly denoted on the structural drawings. Spacing = 150mm c/c as per given details = (6000/150) + 1. 2R-8 4. 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. R403. 4. e. 5, the lateral spacing of the. 6% of the gross wall area for Grade 60 or Grade 40 bars, respectively. Joist system relative dimensions, slab thickness, rib width and spacing between ribs are specified in ACI 318-05, Section 8. the maximum spacing between two secondary parallel bars in case of RCC Slab shall be 5d or 450 mm or whichever is less. Nos of Bars =. Minimum Bar SpacingAs per AASHTO LRFD, section 5. Two-Way. What are the different functions of distribution bars in concrete . 1 of code IS 456:2000. 3. i = 100-yr. 6. 091 = 300. ”Distribution bars are typically used in conjunction with main bars, and they are often spaced at regular intervals along the length of the main bar. B. 6. Bar schedule for Slab; Table 3 : Bar schedule for SlabArea of single bar = (3. Weight of rod per meter length = d 2 /162 where. where a is the radius of the wheel load distribution in cm and h is the slab thickness in cm. Business, Economics, and Finance. 7. 5 In walls and one‐way slabs the maximum bar spacing shall not be more than three times the wall or slab thickness h nor 450 mm. 2 to read as follows:In slabs constructed with lift-slab methods where it is impractical to pass the tendons required by 8. 00 P Flag question The maximum spacing of the distribution bar in the one-way slab must be 450 mm or less than Select one: : a. 8. bar due to its non-availability. If shear reinforcement is required for in-plane strength, spacing of longitudinal reinforcement shall not exceed l w /3. 5. for. 2 of ACI 318-11, it should be clearly denoted on the structural drawings. Maximum spacing should not exceed the lesser of 20 x size of the smallest compression bar or the least lateral dimension of the column or 400 mm. 12% Gross area for HYSD bars, 0. 1. 2: Alternate method for showing two-way slab reinforcement reinforcing bars should be clearly scheduled on the drawings. The number of bars is 50. 12% of high yield strength deformed bars. Clause 6. 15% of the total cross-sectional area of the slab (bD). The wires or bars will be lapped as follows. 2. 5h ≤ 450mm (in areas of concentrated loads 3h ≤ 400mm) Where h is the. Other Standards ACPA T 253-21 Standard Method of Test for Dowel Bars for Concrete Pavement AWWA C213-07 Fusion-Bonded Epoxy Coating for Interior and Exterior of Steel Water Pipeline (American Water Works. Bar crank. and 𝑓𝑦 = 276 𝑀𝑃𝑎 for main and temperature bars. however with a maximum spacing of 4. 090 square inches per foot of slab width, required each way. How to Design Concrete Structures to Eurocode 2 - Chapter 2: Getting started. No of Bars/m 2 = Factored Load / Pcr. 62 m, 9. Step 2: Calculate cutting length of main bars and distribution bars. exposed to earth or weather. spacing of 18” d) Choose bars: For square footings use the same size and number of bars uniformly spaced in each direction (ACI 13. 12% of the gross cross-sectional area if HYSD bars (Fe 415) are used. = 16mm, spacing @ 150 c/c. 25What is the maximum diameter of reinforcement/ bar used in slab as per IS 456: 2000:- there are two types of reinforcement/ bar provided in RCC slab, 1) main bar provided in tension zone of RCC slab and 2) distribution bar provided in compression zone. Heavy loads. 7. 83 mm. 1) The maximum diameter of bar used in slab should not exceed 1/8 of the total thickness of slab. 6 in the following cases; In sections within a distance equal to 4 × thickness of wall above or below a beam or slab. 5:3) 2) centering and shuttering for slab 3) Weight of 12mm Φ bars 4) Weight of 6 mm Φ distribution steel bars 5) Abstract for approximate estimate 6) Cement, sand, Aggregate for slab 7) Percentage steel in slab 8) Cost of slab per m. 7. 4 Deck Overhangs for guidance on deck slab bars. 75 Nos. equal to ( C < 2. 5 times the diameter of the longitudinal barR4405. 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. To firmly hold the main bars in their. For interior Spans: According to the code, the moments can be distributed according to factores shown in the figure: II. Number of Distribution Bars = Lx / spacing + 1 = 3000/150 + 1 = 21 nos. The slab is not. from deviations in bar spacing and bar size are shown in figure 5. R-5 insulation shall be provided under the full slab area of a heated slab in addition to the required slab edge insulation R-value for slabs. 4 Spacing Between Longitudinal Bars. 5 try 100 mm Dead load Slab weight = 2. In ACI 350R-89, the recommended minimum S&T reinforcement for walls with movement joint spacing greater than 60 ft (18. Number of Distribution Bars = Lx / spacing + 1 = 3000/150 + 1 = 21 nos. For instance, the ACI 318-19 specifies minimum slab thickness that satisfies deflection. According to direct design, the balanced load, W1, and the effective prestressing, F, in a one-way slab or the beam supports for one-way slabs can be computed as t _ 48kBW + 8k f (L (3) Wl — 1 + 48kB F, = 72BW L2 + 12 f t2 (4) t(1 + 48kB) where B is the moment coefficient, M = BWL2, depending on the slabDesign of 2 way slab as per IS code. So, provide spacing of. 3. 8 ACI 318 , Section 17. Step 5 – Calculation of Steel Weight. is the strength reduction factor as specified by table 21. 11. Weight of Main Bar = (102/163) x 126. Load Calculation: Live Load = 2 kN/m 2. Code of practice for plain and reinforced concrete ( third revision ) Specification for high strength deformed steel bars and wires for concrete reinforcement ( t&d revision ) Criteria for earthquake design of structures (fourth revision ). 1-3). , the effective depth is: clear spacing between layers clear cover stirrup diameter bar diameters 2 dh . 3. for distribution bars, steel 6 mm or 8 mm are generally used. 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 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. Minimum S&T reinforcement quantities required by ACI 350-01 and As per IS 456:2000, in rcc slab, maximum diameter of main bar and distribution bar should not exceed 1/8th thickness of slab. M. Step Assume load capacity of dowel bar is 40 percent wheel load, find the load capacity factor f as. 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. 2 of IS 456 :2000 , the reinforcing bars shall not exceed 1/8 of theThe minimum size and grade of rebar for slabs depends on a variety of factors, such as the thickness of the slab, the loads it supports, seismic requirements and other factors. 67’ Weight of Distribution Bars = d 2 /52. 2), The bar spacing shall not exceed 450 mm at any location (ACI Code Section 7. If it is desired to replace 10 mm bars by 12 mm bars, then the spacing of 12 mm bars should be. Spacing of Main Reinforcement: The maximum spacing of bars shall not exceed. (b) One-way joist systems in accordance with 9. A review of the behaviour and design of different types of beam-column joints in reinforced concrete moment resisting frame under seismic loading illustrates that design and detailing provisions for the joints in the current Indian seismic code, IS 13920 : 1993. 12. 7. Distribution Bar. Note * Spacing rationalised to suit punching shear links. Wood structural panels with a minimum thickness of 7 / 16 inch (11. dia. Top & bottom distribution bar dia. The distribution bars should not be under 8 mm in a diameter or not be over 1/8 of the thickness of the R. 6. 5. Main Bar = 12 mm, Spacing – 150 mm c/c, Alternate bent up. Height of the footing (Thickness) = h =0. Spacing of bar = area of a bar * width of strip / area of reinforcement required = 78. The no. stationary live loads less than 400 po unds per square foot. properly jointed slab. 12. Provided at the top of the slab. Most of these formulas are based on the analysis of results of tested beams or oneway slabs. The maximum clear spacing between parallel bars shall not be more than 1 N-6O. D. Distribution Bar. To distribute the superimposed load to the main bar. normally lower dia rebar tends to more sagging while placing in top layer. 5. Curtailment of bars in slabs Curtailment of bars is. 5. For distribution bars the maximum spacing is specified as 5 times the effective depth or 450 mm. 2(5)In slabs constructed with lift-slab methods where it is impractical to pass the tendons required by 8. Exceeding a joint spacing of 15 ft. 2 (6) Beams: the maximum longitudinal spacing between shear assemblies s l,max; 9. Now we have to calculate the depth from maximum moment values. 20 square inch (129 mm 2) in cross-sectional area shall be provided: 1. Lapping is not allowed for the bars having diameters more than 36 mm. of Main bars = 20 + 1 = 21 Nos. 10mm Ø hor. You just enter your information in the yellow colour box for the design of two way slab excel sheet as per is 456 such as. 460/2=1. 6666666667 = 21 nos No of bars = 21nos . 3. Main Reinforcement bars are placed in shorter direction and Distribution bars placed in longer span direction. S. e. 2—Construction load factorsThe diameter of the main bar should not be less than 8mm for the HYSD bar and 10mm for plain bars. 7. The “D” bars shown in the tables conform to Article 9. Step 2 – Calculation of Cutting Length. Maximum spacing of bars for slabs • Main bars: 3h ≤ 400mm (in areas of concentrated loads 2h ≤ 250mm) • Secondary bars: 3. STEP. We would like to show you a description here but the site won’t allow us. steel bar on top of wall. The spacing of distribution bar should not be greater than 5 times the effective thickness of slab or 450mm whichever is smaller. 96 x 1000 / 1536 = 130. Practical considerations of one-way slab • Spacing shall be between 150-200 mm (main bars) • Spacing shall be between 150-300 mm (distribution bars) • Max. Temperature distribution due to heat of hydration and internal stresses caused by outside cooling in a free standing concrete block. A distribution bar is equal to (total slab length- 2x clear cover length)/center to center spacing of the bars + 1. Distribution bars of diameter 12 mm and center to center spacing 150 mmm. 1. 376Kgs For Floor slab -2 (One way slab) :-As per the above figure Floor slab -2 is a One way slab. design wheel load 4000 kg. 4 must be met, and max. 8 say 16 nos. Sub-Grade and. 896 x Total Length (where d is in # Nos. 15 % of the gross area if a mild steel bar is used. 2. slab to provide shear resistance. Code of practice for plain and reinforced concrete ( third revision ) Specification for high strength deformed steel bars and wires for concrete reinforcement ( t&d revision ) Criteria for earthquake design of structures (fourth revision ). This reinforcement is reported in terms of area required per unit width of slab. The spacing < 300mm and <3*d as per Cl. Given the radius of relative stiffness of 90 cm. 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. (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. 5bw and 600 mm B. Design of slab. Diameter of a chair bar should not be less than 12mm. Number of Main Bars = Ly / spacing + 1 = (4000/150) + 1 = 27 nos. f. 304. Check spacing of bars. 2, 17. Lower part bar will be worked by maintaining cover with spacer. 5 mm 2. It is mainly to prevent upward bending moment near the joint. 2, also includes guidance on achieving enhanced aggregate interlock by continuing a small percentage of deformed reinforcement (0. Placed at a shorter span. The manual design process included the reinforcement calculation for the main. In design of slab, as per IS-456, what should be minimum percent of distribution steel if Fe 415 reinforcement is used ? The minimum percentage of reinforcement is 0. Thus, the requirement threshold of 125psi (0. from deviations in bar spacing and bar size are shown in figure 5. 4 times effective depthThe precast concrete product, which is used to provide the necessary covers or spacing for the reinforcement bars from the formwork, in all the RCC structures like slab, column, beam, footing, etc. ,). Minimum S&T reinforcement quantities required by ACI 350-01 and11. 5, which is more than 2. 3. Concrete moisture conditions and drying rate. 2 or 8. For main bars, maximum spacing is restricted to 3 times effective depth or 300 mm whichever is smaller. = 2sqm/1sqm = 2nos. 167 for 15% redistribution. 12 % of the gross area if the HYSD bar (Fe415) is used. Minimum requirement in slab : As per clause 26. Calculation for distribution bar: Bending moment for distribution. The maximum spacing between stirrups is smallest of the following provided that (V s <0. 5. Step 1. In case of mild steel, minimum reinforcement along either direction shall not be less than 0. 3. The maximum clear spacing between parallel bars shall not be more than 1 N-6O. the total length of the leg is 2×spacing +50. 3 Design of the slab (per meter strip) Bending moment on the slab is maximum at the face of the column (in this case at the face of the upstand beams) (clause 3. No. Q) Design a reinforced concrete slab for a room of clear dimension 4-meter x 5 meters. The slab is. The. 2, with “S” assumed to be equal to the length between negative moment design sections. Height of block wall = 2. Only 1 D. 4 and shall have a total area of not less than 0. = 20 mm, spacing @ 150c/c. In this kind of. Distribution Reinforcement for Stairs. For ACI 318-08 and ACI 318-11 5. 3. Radius = 2. According to Clauses 8. 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. 6. What Is The Maximum Bar Spacing In Slab As Per IS-Code? In the case of the RCC slab, the maximum spacing between the two parallel main reinforcement bars should be 3D or 300 mm or whatever. NOTE 3 - In co1 3. slabs) or. Top & bottom main bar dia. cm for 1 m width of slab where D is the overall depth of slab. 2. The size and type of rebar used in concrete slab footings will depend on the specific requirements of your project, including the size of the slab, the load it will support, and local building codes. 975 KN)/ (39. 4. Distribution bar 8 mm C/C 140 mm Length 1. Conclusion. length of. Where a slab on ground is cast monolithically with the footing, one No. 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. 7. Provided at the top of the slab. This portion is coming at the top of the bottom main bar. 2 For one-way shallow foundations, two-way isolated footings, or two-way combined. 5 bar is permitted to be located at either the top of the slab or bottom of the footing. Design procedure.