Alternatively, designers can estimate the depth of a beam at 60 mm to 65 mm per meter of the beam’s span. 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. For normal situation, a bar size of No. Purpose, Applications and Design. 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? Please enter your email address. To know more How to calculate material for Plastering work, Must read: How to calculate the number of bricks. What is the percentage of carbon in wrought Iron? Requirements related to the width-depth ratio of reinforced concrete beams are not provided by codes. Important Know-How on Progressive Collapse of Building Structures. However, design codes, certain thumb rules, and past experiences can significantly reduce the lengthy design process. 4/3 times the maximum aggregate size. Smaller depth can be considered but the deflection of the beam should be checked. • Rule of thumb is 24 to 36 times the thickness (gives the spacing in mm/inches). For example, if a volume of concrete 1 cum for a slab. What are the important points of FIDIC Contract we should keep in mind during tendering? What is the full form of 1BHK, 2BHK, 2.5BHK? Residential = 85 kg/m 3. 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. 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. A good designer restrains steel utilization. Then find the volume as explained. A Step-by-Step Guide, Passive House: Reduce Energy Consumption in Your Building. You will receive a link and will create a new password via email. Become VIP Member. But we Say Approx 600 nos. Lost your password? 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. 13 stirrups. For long-span beams, it is economical to use deep and narrow sections. The concrete ingredients will be vary based on the mix ratio. 32 and smaller is practical to use. Of course codes specify minimum reinforcement of 0.8 % and maximum of 6% (But more than 4% will result in congestion. The design of a reinforced concrete beam is achieved through a trial and error method. © 2009-2020 The Constructor. If the bars are placed in more than one layer, those in the upper layers are required to be placed directly over the bars in the lower layers, and the clear distance between the layers must not be less than 25 mm. VIP members get additional benefits. The quantity of steel per cum for most of the buildings is in the range of Columns…. 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. The minimum spacing between steel bars should be considered while the width of the beam is determined. There is no thumb rule for the required reinforcement. In earthquake zones, enough confining reinforcement should be provided in plastic hinge zones. Thumb Rules and Specifications for Design of Reinforced Concrete Beam, Assumptions and Specifications for Design of Reinforced Concrete Beam, 7. The lesser the number of different beam sizes in a structure, the better it is from an economic standpoint. The design variables of reinforced concrete beam are reinforcement ratio, depth and width of of the beam. Concrete cover is the distance from the surface of concrete to the stirrup bars in the beam section. ACI 318-19 provides a minimum depth of a beam based on its span and support condition. One can assume the dimension of the beam from which the self-weight can be computed. 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. Become VIP Member, Do you need to remove the ads? At first, we have to understand the meaning of thumb rule before jumping into the discussion. VIP members get additional benefits. We use the thumb rules for almost in every calculation like concrete calculation, manpower estimation, the material requirement for plastering, wastage’s calculation, brickwork calculation, etc.. What is the requirement of bricks for 1 Cum? 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. Requirements related to the width-depth ratio of reinforced concrete beams are not provided by codes. The shuttering work is called by another name “Form Work” because it gives a uniform shape and smoothness for the concrete. Which country provides highest salary to the civil engineer? All Rights Reserved. What is the difference between Airport, Aerodrome and Airfield. Sorry, you do not have permission to ask a question, You must login to ask question. The diameter of the longitudinal bars 3. 200 to 250 kg/cum Beam….150 to 200 kg/cum Slab……50 to 70 kg/cum Footing…..15 to … It is called as a thumb rule. 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.

thumb rule for slab reinforcement

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