Structural loads, structural analysis and structural design are simply explained with the worked example for easiness of understanding. Let a trial thickness of 6.50 in. Please use these values only for education purpose for clearly understanding the concepts in slab design. When you join you get additional benefits. Depending on how much weight the slab will hold, your budget, and local building codes, concrete slabs can be up . The minimum thickness for plain concrete structural footing is suggested by ACI 318-14 and set as 200mm, and the same value is suggested by UBC. b) L/36 for interior continuous panels without drops and end panels with drops. https://www.concreteconstruction.net/how-to/construction/concrete-floor-slabs_o, https://www.homes247.in/blogs/rcc-construction-technology-153, https://www.gharexpert.com/tips/articles/Construction/1519/Roofing-Ceiling-1519-RCC-Roofing_0, https://civiconcepts.com/blog/what-is-rcc, https://www.slabmateinsulation.com.au/concrete-floor-slab-construction-process-2020/, https://ijcsm.springeropen.com/articles/10.1007/s40069-012-0011-2, https://thecivilengineerings.com/useful-guidelines-for-design-of-rcc-slab-basic-rules-for-slab-design/, https://thecivilengineerings.com/minimum-thickness-of-concrete-slab-beam-column-and-foundation/, https://www.totalconcrete.co.uk/concrete-grades/, https://www.gharexpert.com/tips/articles/Construction/2375/Brick-Walls,-Pillars-Structure-2375-Tips-Laying-RCC-slabroof_0, https://civilsir.com/best-concrete-mix-ratio-for-roof-slab-beam-and-column/, https://www.civilexperiences.com/minimum-thickness-of-rcc-slab/, https://civilsir.com/minimum-thickness-of-rcc-slab-as-per-is-456/, http://www.gharexpert.com/ques_ans/Ans_To_ques.aspx?QID=382&CatID=, https://en.wikipedia.org/wiki/Reinforced_concrete, https://www.sciencedirect.com/topics/materials-science/reinforced-concrete, https://theconstructor.org/structural-engg/flat-slab-types-design-advantages/13919/, https://theconstructor.org/practical-guide/concrete-slab-construction-cost/28153/, https://extremehowto.com/what-is-the-minimum-thickness-for-concrete/, https://www.dcpu1.com/blog/different-types-of-concrete/. Column Dimensions Simply Supported Slab = L / 20; One End Continuous Slab = L / 24; Both End Continuous Slab = L / 28; Cantiliver = L / 10 However, in other criteria, they do not directly specify the minimum slab . Some slabs might measure up to 20 inches in thickness. The thickness of slab is a vital factor in the building design and construction and it directly related the cost of the structural system. where, L is the average length of the panel. However, we can calculate the basic requirements of minimum thickness considering the above factors. . ACI 318-14 provided recommendations to determine minimum thickness of slabs (including slabs with beams, flat slabs, flat plates) that can be found here. Note: Depending upon the various building design considerations the slab thickness varies. One-way slab. Serviceability requirements such as deflections, Serviceability requirements such as floor vibrations, Lateral Load Resisting System [Building Design], Design and Construction of Tunnel Junctions, Hot Dip Galvanizing -The Facts to be Aware, 14 Types of Structural Forms for Tall Buildings, All About Shear Wall [Design Considerations], Design of Deep Beam [ all you need to know ], Galvanizing vs Painting [ a in depth comparison ], Ground Beam Design [key factors to be considered], How to Calculate Uplift Pressure on Foundations, Moment Redistribution in Reinforced Concrete Beams, Punching Shear Design a Detailed Discussion, Structural Analysis of Buildings a Detailed Study, Thrust Block Design [Theory and Worked Example]. Fig.3: slab on ground. Sorry, you do not have permission to ask a question, You must log in to ask a question. Therefore, the minimum concrete thickness can be calculated as follows. Depending on use, most concrete companies recommend a minimum slab thickness of three to four inches for a residential concrete installation. 8000mm / Eff. For example, in a conventional garage, the concrete slab must be at least four inches deep to meet building code requirements. A: Concrete is typically applied at a thickness of 2 inches or more, but the thicker it is, the stronger the slab will be. What are the different types of handrails used in bridges. Please enter your email address. Minimum Clear spacing between bars based = aggregate size + 5; generally, we use 20mm aggregate for concrete works. Where cement concrete 1:2:4 is used; it means 1 part of cement 2 parts of fine aggregate/coarse sand and 4 parts of coarse aggregate. A 6-mil (0.006 inch; 0.15 mm . ACI 318-14 provides suggested minimum thickness for one-way solid slab, as provided in Table 1, unless deflections are calculated. The same value is recommended by International Residential Code (IRC 2009) for foundation wall. However, the usual thickness of a concrete slab is around 10 cm. Eventually, people move towards a good solid bench under a 1" or thicker slab. Log in to TheConstructor to ask questions, answer peoples questions, write articles & connect with other people. Ratio of clear span in longer direction to clear span in shorter direction. However, multiple factors tend to determine the overall thickness of the concrete slab. Reinforcement bar diameter = 10mm; at the beam, we have four-bar with the top reinforcements. It is important to know the slab thickness of the rack floor because there is a minimum slab thickness that is required based on the required nominal embedment of the anchor bolt. The beam dimensions for various floors is explained in my previous post please click here to read. ACI Code limitations for minimum thickness of two way slab are discussed in the following sections. Required fields are marked *. What are the different types of handrails used in bridges? The pour is going to be on top of an existing concrete floor (basement . The engineer has approved the weight load. Minimum Thickness of Two Way Slab as per ACI 318-11 for Deflection Control, Two Way Slab Design by Direct Design Method as per ACI 318-11, Shear Design of Fiber Reinforced Concrete Structural Elements, Bamboo Reinforced Concrete Properties, Mix Proportion, Design and Construction, Space Frame Structure: Components, Types, and Advantages, 8 Types of Structures in Civil Engineering, Types of Foundation for Buildings and their Uses [PDF], Compressive Strength of Concrete -Cube Test [PDF], Procedure, Results, 16 Types of Heavy Equipment Used in Construction, Methods of Rainwater Harvesting [PDF]: Components, Transportation, and Storage, Calculate Quantities of Materials for Concrete -Cement, Sand, Aggregates, Role of Structural Engineers in Designing Earthquake-Resistant Buildings, Considerations for Engineer when Designing a New Structure. For one end continuous one-way solid slabs, Minimum Slab Thickness = l /24 c. Which is the code used for the design of the RCC Bridge? Depending upon the building design consideration the thickness of slab section changes. What must be the maximum dry density of Granular Sub Base & Wet Mix Macadam used What is the Safe Bearing Capacity values for Different Soils? The slab is supported on the all the four sides in this case, loading distribution will takes all directions equally. Maximum Size of Concrete Slab: tandards such as ACI 318 specify the minimum thickness of the slab based on the length of the slab. Four inches is most common for a slab. Reinforced concrete (RC), also called reinforced cement concrete (RCC) and ferroconcrete, is a composite material in which concretes relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ductility. Join now! For simply supported one-way solid slabs, Minimum Slab Thickness = l/ 20 b. Element designs with notes and discussions have added to get comprehensive knowledge. As we knew that the concrete is weak in tension and strong in compression. Read More:Two Way Slab Design by Direct Design Method as per ACI 318-11. Design process includes proper assumption of structural element sizes and then check the suggested dimensions to make sure that it meets the requirements of the design. The minimum recommended thickness is 1 to 2 in. Minimum thickness of concrete slab, beam, column, foundation and other structural members is selected to meet the design requirements as per standard codes. In order to do so, the minimum thickness needs to be 2 (2-1/4 on hydronic heat systems). Concrete slab thickness = 20 x 2 + 10 x 4 + 20+5 = 105 mm. 1. The first stage of the design is finding the bending moment of the slab panels. Reinforced concrete flat plate is a type of structural system containing slabs with uniform thickness supported directly on columns without using beams. The thickness for the building structure slab is depending upon the various factors like number of floors, total load, type of support, grade of the concrete, span length etc. Minimum thickness of rcc slab is 4 or 100mm, 3 for side walk, 4 for patios, 6 for driveway and minimum 4 thick for parking. The minimum RCC beam size should not be less than 9 9 or 225mm 225mm with the addition of a 125mm slab thickness. It is a structural element of modern buildings. For other conditions, the following modifications should be applied: It's a good idea to make the foundation six to eight inches thick if . Slabs are supported on Columns and Beams.2021-08-22, The major types of concrete slabs used in construction are one-way joist slab, flat slab, flat plate, waffle slab, hollow core slab, precast slab, slabs on grade, hardy slab, and composite slab.2018-12-24. Depending upon the various building design considerations the slab thickness varies. Generally, concrete residential house and garage slabs are 4 to 6 inches thick. How to determine the flexural strength of the concrete ? The calculation is only based on the construction and detailing requirement according to BS 8110 Part 01. The following are two code specifications (ACI and BNBC) for the minimum thickness value of a concrete footing Slab design is comparatively easy when compared with the design of other elements. For example, if your rack design required the anchor bolt nominal embedment to be 4-5/8" the slab must be at least 7" thick (See minimum member . When you join you get additional benefits. Given the industry standard for residential properties is four inches, it's a good idea to budget for that extra 0.5 inches to provide additional support. Flat plates are commonly used in buildings where relatively low gravity loads are applied.2012-07-01. But it depends on your work area and what you have at hand to work with. A 6 inch thick concrete garage floor, reinforced with steel rebars, will ensure higher strength & durability. A: Concrete is typically applied at a thickness of 2 inches or more, but the thicker it is, the stronger the slab will be. In residential buildings, the minimum thickness of a raft slab is 85mm (3.35 inches) in waffle slab construction and 100mm (4 inches) in raft slab construction. ACI 318-14 recommend the same value of non-prestressed beams as provided in Table 2. Join TheConstructor to ask questions, answer questions, write articles, and connect with other people. How thick must a concrete floor be? The minimum slab thickness is the minimum of: a) 130 mm. Minimum thickness for concrete pour. Commercial Driveways: The minimum depth for commercial driveways is 6 inches or 8 inches, depending on the municipal code covering the site. Standard concrete floor slab thickness is residential construction is 4 inches, five to six inches is recommended if the concrete will receive occasional heavy load, such as mortar homes or garbage trucks. Load Calculation: The minimum recommended thickness is 1 to 2 in. An article once reported that the thickness of one specified 6 inch slab varied from 2 inches to 8 inches, but the "normal" range should have been between 4 inches to 7 inches of thickness with an "average" concrete thickness of 5 to 5 inches. I just got my lee valley router sled and built a table and my 2" thick slabs will end up being 1" - 1-1/4" give or take. What is the minimum thickness for a concrete slab?
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