For example, if the slab concrete volume 1 cum then the approx shuttering requirement is 1 x 6 = 6 Sqm. If the estimated self-weight is found to be appreciably less than the weight of the section designed, it would be necessary to resize the beam and recalculate the beam weight and applied moment. However, design codes, certain thumb rules, and past experiences can significantly reduce the lengthy design process. Alternatively, designers can estimate the depth of a beam at 60 mm to 65 mm per meter of the beam’s span. The Thumb rule for shuttering work is listed below. Steel quantity = Volume of Concrete x Density of Steel x % of Steel. We can’t calculate each and everything in the field. Read: Bar bending Shape codes. The lesser the number of different beam sizes in a structure, the better it is from an economic standpoint. Sorry, you do not have permission to ask a question, You must login to ask question. Become VIP Member. For long-span beams, it is economical to use deep and narrow sections. Purpose, Applications and Design. In earthquake zones, enough confining reinforcement should be provided in plastic hinge zones. © 2009-2020 The Constructor. • Keep the thickness variation to -5mm (-1/4") / +10mm (3/8"), and the subgrade as flat as possible with no abrupt change greater than 15mm (1/2") in about 1.2m (4'). If the Plinth area is 100 Sq.ft (10 x 10) and the required concrete volume is 100 x 0.04 = 4 Cum with M5 mix ratio means, Now from the below table which is for 1 m3, Required Concrete ingredients for 4 m3 of M5 is. One can assume the dimension of the beam from which the self-weight can be computed. 32 and smaller is practical to use. The design of a reinforced concrete beam is achieved through a trial and error method. 4/3 times the maximum aggregate size. Example calculation: Steel quantity = Volume of Concrete x Density of Steel x % of Steel. Important Know-How on Progressive Collapse of Building Structures. i want to knowhow to calculate the plaster work of a round shape area.. Hello, Alderson this article “plastering calculation” will help you know the calculation of plastering. Of course codes specify minimum reinforcement of 0.8 % and maximum of 6% (But more than 4% will result in congestion. After a required reinforcement area is computed, Table-1 can be used to select the number of bars that provide the necessary reinforcement area. Alternatively, Table-4 might be used as a rule of thumb for the estimation of concrete weight. Country Advantages and Disadvantages of Prestressed Concrete. The Thumb rule for steel in RCC has listed below. For normal situation, a bar size of No. What is the percentage of carbon in wrought Iron? Every professional have maintained their own set of thumb rules. The size of a beam is governed by negative moments or shear forces at supports. Table-2: Maximum Number of Bars as a Single Layer in Stems of Beams for Maximum Aggregate Size of 19 mm, Tabl-3: Maximum Number of Bars as a Single Layer in Stems of Beams for Maximum Aggregate Size of 25 mm, Maximum concrete cover assumed to be 40mm to the No. For example, if a volume of concrete 1 cum for a slab. Become VIP Member, Do you need to remove the ads? Concrete Mix Design Calculation for M20, M25, M30 Concrete with ... How to Become a Construction Contractor? Initially, certain aspects of design, like geometry and self-weight, should be estimated and then checked during the design process. Calculate Quantities of Materials for Concrete -Cement, Sand, Aggregates, Types of Foundation for Buildings and their Uses [PDF], Methods of Rainwater Harvesting [PDF]: Components, Transport, and Storage, Quantity of Cement and Sand Calculation in Mortar. However, architectural considerations may prevent the use of deep concrete beams, and the designer would be obliged to select wide beams. Design codes provide specifications regarding bar size selection, spacing, concrete cover, and bar placement. A good designer restrains steel utilization. Important Thumb Rules for Estimation in Civil Engineering, Thumb rule for Manpower Productivity Estimation, Thumb Rule of Concrete material requirement, How to calculate material for Plastering work, How to calculate steel weight for Reinforcement, Deshuttering Time for Slabs, Beams and Columns, Difference between Nominal Mix and Design Mix. Satheesh is a Civil Engineer who has more than 9+ Years of experience in residential construction. For beams that are not exposed to weather or are not in contact with the ground, the minimum clear distance from the bottom of the steel to the concrete surface is 40 mm as per ACI 318-19 section 20.5.1.3, Table 20.5.1.3.1. To know more How to calculate material for Plastering work, Must read: How to calculate the number of bricks. The quantity of steel per cum for most of the buildings is in the range of Columns…. Because we can not estimate every time according to the individual requirement. Tips to Avoid Reinforcement and Embedment Congestion in Concrete Members. Thumb rule to calculate Steel quantity of above slab = Volume of Concrete x Density of Steel x % of Steel of Member Steel quantity required for above slab = 3 x 7850 x 0.01 = 235Kgs For accurate calculation, you can refer to Bar Bending Schedule Self-weight of Reinforced Concrete Beam, Spacing between Bars in a Reinforced Concrete Beam. Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. Cloud Computing in Construction: Are we Availing all its Benefits? The ratio of width to a depth of reinforced concrete beam is recommended to be fall in the range of two and half to three. At first, we have to understand the meaning of thumb rule before jumping into the discussion. Approx Steel requirement = 1 x 7850 x 1% = 78.5 Kg/Cum. The concrete cover is required to protect steel bars from environmental attacks and vandalism and ensure a good bond between reinforcement and concrete. What is the difference between Airport, Aerodrome and Airfield. The applicable codes such as ACI 318-19 provide specifications to help the designer, but some estimations and assumptions are still required to be made. However, as a rule of thumb, it is better to use a depth which is two and a half to three times the beam’s width. The diameter of the longitudinal bars 3. However, while this simplest method to check on the total estimated quantity if reinforcement, same time it is the least accurate and it requires considerable experience to breakdown the tonnage down to … There is no thumb rule for the required reinforcement. VIP members get additional benefits. Same method explain just you have to calculate the area of the round shape portion. 200 to 250 kg/cum Beam….150 to 200 kg/cum Slab……50 to 70 kg/cum Footing…..15 to … The steel percentage against concrete volume will vary based on the structural element and the minimum and maximum percentage of steel utilization have listed below as per IS standard. For example, if a volume of concrete 1 cum for a slab. Residential = 85 kg/m 3. Lost your password? He is the author, editor of Civil Planets. It is preferable to use a single bar size in a beam, but it is possible to use two different bar sizes to get the required steel area. However, as a rule of thumb, it is better to use a depth which is two and a half to three times the beam’s width. 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