Spacing of chairs should be per 1 m or 1 no. Crack Control – when crack widths are not checked by calculations No Further Checked Required. length of. = 16mm, spacing @ 150 c/c. 10. 9, page 341. Concrete moisture conditions and drying rate. Thickness of Slab = 0. Distribution Bar = width of the foundation – 2 CC ÷ Spacing +1. 04𝑚𝑚2 𝑎𝑏 113. from deviations in bar spacing and bar size are shown in figure 5. 3. 7. EXAMPLE: Suppose we have a one-way slab, which has a length of 5 m or a width of 2 m (clear span). 9. 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. 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. Basically slab is the horizontal member which is rests on the beam section. 5, the lateral spacing of the flexural bars should not exceed three times the thickness of 18 inches. 3 b) 1). For distribution bars (cl. 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. Bar schedule for Slab; Table 3 : Bar schedule for SlabArea of single bar = (3. (14) Step Find the load transfer capacities , , and of single dowel bar with the. design wheel load. Requirements regarding dowel bars and spacing of joints have been modified. The Clear. 1 for minimum thickness of non-prestressed two-way slabs without interior beams is revised to include Grade 550. 3. The diameter of the chair bar = d =12mm. 4. of Main bars = (3000)/150 + 1. ACI 7. This reinforcement is reported in terms of area required per unit width of slab. t + d Lsy. c. BASIC THUMB RULE FOR RETAINING WALL DESIGN-Base slab thickness not less then 0 (H= Total height of retaining wall)The bottom part of the chair bar is called the leg of the chair bar. however with a maximum spacing of 4. 4. 7. For distribution bars, the maximum spacing is specified as 5 times the effective depth or 450 mm whichever is smaller. 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. Every alternate bar is cranked up to 0. 83 mm. Given, Cranked bars or Main bar of diameter 16 mm and center to center spacing 150 mm. bars in two-way slabs. 3. ”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. 3% (100As/bd < 0. Business, Economics, and Finance. Effective depth=d provided =120-20-4= 96 mm. The following details are obtained from the figure-2: Length of Footing = X = 2m. ratio of flexural stiffuess. (15) Step Spacing of the dowel bars. Considering M20 grade of concrete and Fe 500 steel of diameter of 10 mm. 4 Water 5. 3. 7. , addi-tional bonded shrinkage and temperature reinforcement conforming to 7. 3. 19. In case of HYSD bars, minimum reinforcement along either direction shall not be. 2 mm. Maximum diameter of the bars (cl. 3. Collectors, Chords and ConnectionsIS Code. 3. 13. Distribution Bar. Two way slab building. 2. How to calculate bar Bending Schedule for Slab? One way slab Reinforcement Detailing. BS EN 1992–1–1 section 6. Unit weight formula for kg per metre = (D2/163) × L kg/m. 2. Top and bottom clear cover of slab is 20 mm. Spacing of Main Reinforcement: The maximum spacing of bars shall not exceed. 6. As per IS 456 : 2000, Minimum percentage of reinforcement: 0. Clear cover (top & bottom) = 50 mm. 10. 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. Chapter 9 which is also per mitted per ACI 349-06 Appendix D. The cross‐sectional area of one N28 bar is As = 620 mm2 and with N12 stirrups at 150 mm centres, Atr = 110 mm2. Design a one-way slab having a simple span of 3 m. 4—Construction load distribution 3. 7. 1. 1. The dowel bars are provided in the direction of. for industrial slabs that carry distribution. Weight of the bar as per their length and. Minimum Reinforcement Ratio in Uniform Footing. Abstract. The Clear cover will be 25 mm (Top or Bottom) and the thickness of the slab will be 150 mm. Development Length (Ld) = 40d. 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. The slab is supported all around walls of width 300 mm. 15%of gross cross-sectional area if plain bars are used and 0. To find the Bar Bending Schedule for Slab we use the following formula, No. the constant value of 50. 15% gross c/s of slab – for MS bars; 0. 1 (3) Solid slabs: the maximum spacing of flexural reinforcement bars s max,slabsThere are 2 types of bars in one way slab: Main Bar & Distribution Bar; Main Bar Diameter = 10 mm; Spacing Between Main Bars(C/C distance) = 150 mm; Distribution Bar Diameter = 8 mm; Spacing Between Distribution Bars(C/C distance) = 100 mm; Length of Slab = 6000 mm; Width of Slab = 3000 mm;. Dia of Chair. 090 square inches per foot of slab width, required each way. Section 8. 1 of IS 456:2000, the reinforcement in either direction ,in slabs shall not be less than 0. For interior Spans: According to the code, the moments can be distributed according to factores shown in the figure: II. bars at 400 mm o. Total wt of Bars = 150. 3. The direction of the main bars (T1 and B1) in a flat slab system depends on various design factors such as the span length, load distribution, structural efficiency, and code requirements. 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. 5. 3) For distribution bars, the maximum spacing is specified as 5 times the effective depth or 450 mm whichever is smaller. (b) One-way joist systems in accordance with 9. Always main bar use in shorter span. 12 % of the gross area if the HYSD bar (Fe415) is used. stationary live loads less than 400 po unds per square foot. Consider the ACI 318-14 code according to which the Ø is the strength reduction factor as specified in table 21. Tech. Distribution Bar. 6. One Way Slab Bar Bending Schedule Calculation. Load Calculation: Live Load = 2 kN/m 2. 2. 21. 1. For slabs less than 200 mm thick the following maximum spacing rules apply: For the principal reinforcement: 3h but not more than 400 mm. 960 x 16 =. 26. ACI 318-19, Table 8. 21Two-Way Slabs 6 b- Distribution of the total factored static moment to negative and positive moments: I. 3 Slabs Monolithic with Supports 24. 5d = 5 * 130 = 650 mm. 6—Factors affecting the construction load distribution 3. Eurocode 2 section 9. 3. àIn case the thickness of slab is 120mm, the height of bent bar should be 60mm. Number of bar =radius of slab/spacing. Sawcut Joints A typical SOG includes three different types of joints, described in detail in ACI 360R Chapter 5. Placed at a longer. 6. 2—Construction load factorsThe diameter of the main bar should not be less than 8mm for the HYSD bar and 10mm for plain bars. 3. Distribution bars are placed on the top of the. 2. 8. The slab has to carry a live load of 4 KN per meter square. 3. 6 in the following cases; In sections within a distance equal to 4 × thickness of wall above or below a beam or slab. 00mm Bottom Footing Clear Cover (F, CL). 225m. k < 0. Conclusion. 5. The no. Distribution Bar. = D1=10mm. 12. 1 or the bottom bars required by 8. 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. 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. 1 Definitions 25. however with a maximum spacing of 4. Reading time: 2 minutes. 6 Reinforcement 5. 2) height of chair:- vertical distance of chair bar is known as height of chair, it is main part of calculation to find and how to calculate height of chair bar Height of chair = depth of footing _ (upper and lower clear cover of concrete + bottom. Design size and spacing of dowel bars at an expansion joint of concrete pavement of thickness 20 cm. Actual variety of 1 sides rebar =Number of main bar – rebar of the middle. 6. The slab is. The length of a distribution bar in east side is, = (17′-1½″) + 2 × 10″ = 18. 5 times the diameter of the longitudinal barR4405. The Indian Standard (IS) code for the preparation of steel bar bending schedules is IS 2502:1959. 133 square inches per foot). Area of One Bar 20114 Sqmm 16 RESULT Spacing of Distribution Bars 360 mm 16 from BSCE 11234 at Xavier University - Ateneo de CagayanThe maximum diameter of bar used in slab should not exceed 1/8 of the total thickness of slab. 5 Admixtures 5. Step 2: Calculation of cutting length ( for main bars and distribution bars) Cutting length of main bar = Clear span of slab + (2 × Development Length) ( 2 × D e v e l o p m e n t L e n g t h) + Inclined Length - Bend Length. Structural Design 1 - Design of Reinforced Concrete Structures REFERENCES/COURTESY 1) IS 456 : 2000 — Plain and reinforced concrete – Code of practice 2) S Unnikrishna pillai and. Two way slabs Since our typical floor slab is symmetric in two directions, we analyze only a representative section for moments and their adjustments, as shown below. Calculation of effective depth. It is appropriate to design the slab per unit width, hence b = 1000mm. For distribution bars the maximum spacing is specified as 5 times the effective depth or 450 mm whichever is less. 78′ Say, 19′. Thus, the requirement threshold of 125psi (0. 1 Cement 5. The main bars will be 12 mm in diameter @100 mm c/c spacing. For footings that exceed 8 inches (203 mm). For Edge Spans : Static Mom. Figure 3. 6. 2 of IS 456), the maximum spacing is the lesser of 5d or 450 mm i. 4. 4 Slabs Spanning in Two Directions at RightAngles 24. No. 3-Main bar Bottom Area Given data. This spacing should be reduced by a factor of 0. How to Design Concrete Structures to Eurocode 2 - Chapter 2: Getting started. Given the radius of relative stiffness of 90 cm. Heat de-velopment can also be reduced by ad-Cutting length = clear span of the slab + (2 x Ld) + ( 2 x 0. The following minimum limitations relating to various structural components shall be followed: Thickness of top flange : 100 mm. Thickness of Slab = 0. 6. 2. Distribution bar = 8mm@150mm c/c. These bars should be distributed as evenly as possible between the negative moment design sections, with one bar being placed at the inside of each bottom truss bar bend. 5 specifies that Spacing ≤ 3h or 18 in, whichever is smaller but > 1. The diameter of the chair bar should not be less than 12 mm. 7. 3(d) and 17. If the reinforcing bars do not extend beyond the critical section. 2 (6) Beams: the maximum longitudinal spacing between shear assemblies s l,max; 9. Bar Spacing According to ACI Code 7. C. Step 1- Calculation of Numbers of Bars. 17 The design of one-way slab is simple and can be carried out easily. f ck = 25 Mpa. 3 m) is either 0. Common rebar sizes range from #3 to #6 for slab footings, with #4 being the most commonly used. 2, or >0. Suppose we have a one way slab,which having a length 5 m or width 2 m (clear span). If redistribution is carried in design, the allowable max spacing needs to be reduced or relaxed as per table 15 of IS456. Minimum Bar SpacingAs per AASHTO LRFD, section 5. Maximum spacing of main bar is restricted to 3 times effective depth or 300 mm whichever is less. Number of Main Bars = (Length of Longer Side / Spacing) + 1 = (6000/150)+1. 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. 1 (2) states that, distribution should minimum 20% of the main reinforcement. Minimum number of reinforcing bars. 2 As per NSCP 2015, a minimum shear reinforcement in concrete design shall be provided in all regions where Vu > 0. a = axial spacing of the bar for calculating the lap length (ci. (table 15). However,. 3. 5. 14 m, and 10. 1—General 8. 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. 3 Slenderness Limits for Columns 25. 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. Exceptions: 1. 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. Concrete moisture conditions and drying rate. 6 𝑀𝑃𝑎. 25 8 #5 12 6 6 2 4. No of bars = (opp length/spacing) + 1. 2and3 C. 15m. 11. IN Downloaded from Ktunotes. 5% or 0. (a) for a distance equal to the larger lateral dimension of the column above and below a beam or slab, andvii) Any other function assigned to the expansion joint as per the specific requirements of the structural systems. three times the effective depth of solid slab or; 300 mm; whichever is smaller. 67 m, the slab depth for the voided slabs ranged from 10 inches to 16. 6 = 17. In case of mild steel, minimum reinforcement along either direction shall not be less than 0. Number of Main Bars = Ly / spacing + 1 = (4000/150) + 1 = 27 nos. 5, the lateral spacing of the. 460/2=1. For distribution bars the maximum spacing is specified as 5 times the effective depth or 450 mm. 8. 1. Provide main reinforcement of 10 mm diameter bars at 120 mm c/c. Calculation of ratio of the length of long span to length of short span. 15% for Mild steel bars. 11. 9. 6. 2 or 8. Wall Load Per Running Meter. e. 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 ). and the clear spacing between the bottom bars a = 60 mm. How do you calculate slab distribution bar? Formula = (total length – clear cover)/center to center spacing + 1 main bar, = (5000 – (25+25))/100 + 1, = 4950 divided by 100 + 1, = 51 bars. Design the slab using the data given below; Purpose of building – Residential. 3 times effective depth c. ? 1. For basic building the 4 number of bars is sufficient as per code. 12% gross c/s of slab – for HYSD bars; Spacing of distribution bars. Fig. Maximum spacing of bars for slabs • Main bars: 3h ≤ 400mm (in areas of concentrated loads 2h ≤ 250mm) • Secondary bars: 3. AS3600-2009 P P Lsy. 6. ,). 3. Maximum spacing of tension bars (all slabs) In accordance with clause 7. 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. #IS456Explanation#SpacingofReinforcement#IESGATEWizIn this Video Part-45,detailed discussion of IS 456-2000 provisions of Spacing of Reinforcement Bars ha. If a closer spacing of bars is required at the columns, as per Section 13. Cutting length= length of retaining wall – 2 x concrete cover. 6H, and 0. 3 ANALYSIS 3. 0 8 #5 12 6 5 2 4. Concrete floor slabs on grade are subjected to aIn steel reinforcement binding wire required is 8 kg per MT. 78′ Say, 19′ >WEST side. (b) For No. In ACI 350R-89, the recommended minimum S&T reinforcement for walls with movement joint spacing greater than 60 ft (18. Size of the bar is less than the main bar. 7. Load Distribution. 7. 1. 900 m. 6. 2, The diameter of reinforcing bars shall not exceed one-eighth of the total thickness of the slab. 960m. thick slab, the maximum joint spacing should be limited to 12 to 15 ft. 2: Alternate method for showing two-way slab reinforcement reinforcing bars should be clearly scheduled on the drawings. Adequacy of curing. What Is Bar Bending Schedule | Preparation as Per Bs 4466 | Tolerances as Per Bs 4466; Disadvantages of Dowel Bar. 11 bars and smaller, continuing reinforcement provides double the area required for flexure at. Distribution Reinforcement for Stairs. ment among different types of cements. If the maximum diameter for slab thickness is 75 mm, so the diameter of reinforcing bars should be 8 mm. C. , 300 mm. 4 Deck Overhangs for guidance on deck slab bars. Number of Required Bars Formula = (Length of slab / spacing) + 1. 11. (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. A cantilever slab 200 mm thick is 1. 2. 3. 5 try 100 mm Dead load Slab weight = 2. 2. 2 (7) Beams: the maximum longitudinal spacing of bent-up bars s b,max; 9. 75H for surcharged wall. TRANS REINF - Reinforcement required along the transverse direction ( along local Y axis of the plates ). Now. e. Some discussion to decide about max spacing: AS per IS 456: Maximum spacing for bars in beams is 180mm for Fe415 grade and 150mm for Fe 500 grade reinf. The code itself suggests that the diameters can be #3, #4 and #5. 3 Direct supply of steel reinforcing bars to site by QA Manufacturer 27 Section 5 Purchasers testing 28 5. 12. • Maximum area of main steel in slab = 4% 𝑜𝑓 𝑏𝐷 (As per ACI). , if the upper bar of 16mm dia. In general we use 5 inch (125mm) thick slab, if thickness of slab is 125mm,then maximum diameter of bar used in. Roof drainage system (Adapted from the International Code Council). 6. 2. EXAMPLE PROBLEM 1. For a 6 in. 0018 times the slab's gross area, but the maximum spacing of the bars differs. Thickness of the slab=l x /32= 98. Base slab width b= 0. Whereas, Factored Load = 1. Weight of Distribution Bar= d²/162. 2—Flexural reinforcement spacing 8. 3 – When spacing of tendons exceeds 54 in. Height of block wall = 2. Distribution steel: 0. For Edge Spans : Static Mom. Provide a thickness of D=120 mm. 1. Type and spacing of the control and construction joints. 10. For distribution bars (cl. 14. b) Slab depth does not. 1—Early-age concrete material strength development 4. 6% of the gross wall area for Grade 60 or Grade 40 bars, respectively. 26. 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. This chapter shall apply to the design of nonprestressed and prestressed beams, including: (a) Composite beams of concrete elements constructed in separate placements but connected so that all elements resist loads as a unit.