Depends what work the slab needs to do within the wholebuilding structural system Every building is different and all the structural parts of every building need to be designed to work together, so this is definitely not something you should be Provide cover blocks for slab and beams Fix the beam reinforcements Anchored into the columns Check reinforcement size and number as per design schedule Bottom reinforcement to be lapped within 1/3 beam span from supports only Check clear cover at beam bottom as well as the sides Top reinforcement Lap within midspan only (Lap at positiveThe top section of the joist is embedded in the concrete slab and has 4 functions;
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Suspended slab reinforcement-For a suspended slab, there are a number ofZEGO ZlabFORM Our ZEGO ZlabFORM is our newly introduced integrated and insulated, reinforced concrete suspended slab flooring system Provides additional spans due to integrated connection of the reinforced concrete wall Can be incorporated onto any loadbearing wall
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This design approach is sometimes referred to as continuously reinforced or jointless slabs and allows numerous, closely spaced (3 to 6 feet), fine cracks to occur throughout the slabIn situ construction of vertical & horizontal reinforcement Prefabrication of vertical & horizontal reinforcement Scheduled / Nonscheduled Ground slab reinforcement Suspended slab reinforcement Crane bases, column pads, elevator pads Bridges / Under passes / Tunnels Ship wharf walls / Lot walls / Tanks Wind Farm Bases / SubstationsA concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete Steelreinforced slabs, t
While making structural drawings of the reinforced concrete slab, the slabs are abbreviated to "rcslab" or simply "rc" What are the Design of various types of Slabs and their Reinforcement ?If reinforcing mesh is required, cut it to fit inside the formwork allowing 5 cm clearance between the formwork and end of the bars so the reinforcing will be completely covered in concrete Use plastic bar chairs placed closely together to support the reinforcing mesh and hold it in the centre of the slab Concrete slabs are rectangular, reinforced concrete structures that can be sized in length and width, but have a smaller depth They are used for floors, roofs and bridge decksYou can choose from many different designs for a suspended slab to
Suspended slab formwork is formed and cast onsite, and this is done with removable or nonloadable formwork s or permanent formwork s that form part of the reinforcement Therefore, to produce a suspended slab formwork, we need precise formwork, which can be selected from two different typesΣAtr = crosssectional area of the transverse reinforcement along the development length Lsyt ΣAtrmin = crosssectional area of the minimum transverse reinforcement, which may be taken as 025As for beams and 0 for slabs As = crosssectional area of aSuspended slabs For a suspended slab, there are a number of designs to improve the strengthtoweight ratio In all cases the top surface remains flat, and the underside is modulated A corrugated slab is designed when the concrete is poured into a
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Construction of concrete slabs that will receive moisturesensitive or pHsensitive flooring materials or coatings for both slabsonground and suspended slabs 5231 Vapor retarder permeance—A vapor retarder/ barrier is a material that is intended to minimize the transmission of water vapor upward through the slab from sources below1 It is the compression element of the noncomposite joist during construction 2 It is a "chair" that supports the welded wire mesh or the reinforcement which develops negative moment capacity in the concrete slab over the joist 3Where are suspended slabs used?
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The concrete slab requires a minimum compressive strength of 25MPa (30MPa for carparks) in 28 days Steel mesh reinforcement is placed at minimum cover, (according to durability requirements NZS 3101 Section 311) primarily for crack control caused by shrinkage during curing Guidance on crack widths tolerances is given in NZS 3101 and Hera report R4113Reinforcement Estimates Any irregularities shall be immediately actioned This method statement describes the working procedures for suspended slab and all related activities This will include formwork, steel reinforcement work, scaffolding, propping / back propping, concreting works and removal of forms, props, scaffolding & supportThe Insudek suspended slab consists of the following components Lipped channels 150/225/300mm wide x 60mm high with Prefixed reinforcement spanning between RC beams, structural steel beams and/or load bearing brickwork are spaced at 650/725/800 c/c – limiting steel fixing on site The slab is designed as simply supported or continuous ribs between supports
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Step 1 FIrst, find number of rods required for main reinforcement and distribution Number of Bars Formula = (Length of slab / spacing) 1 Number of Main Bars = (Ly / spacing) 1 = (5000/150) 1 = 34 nos Number of Distribution Bars = (Lx / spacing) 1 = (00 / 150) 1 = 14 nos Step 2 Depending on where the job is located Refer to Concrete Codes for this design, possibly Eurocode 2 If it is a suspended slab, they generally won't have top reinforcement midspan for slabs with regular column spacing If your not a practising structural engineer you really should be running this design past one Miami condo workers suspended repairs last fall due to concrete damage report concrete and steel reinforcement in the pool area could have contributed to the building's collapse, on its own
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Suspended concrete slab is referred to a cement slab that is not in contact with the ground This type of concrete slab construction requires different concrete slab design from the one we normally see that is cast on the ground The most common application of suspended slab in residential construction is used at garage floor where below the garage floor is a storage room orA maximum of 1/4 of the slab reinforcement in either strip may be interrupted (Section ) To apply this simplified approach,ACI requires that the total amount of reinforcement calculated for the panel without openings, in both directions, must be maintained; Thickness of the slab is decided based on span to depth ratio specified in IS Minimum reinforcement is 012% for HYSD bars and 015% for mild steel bars The diameter of bar generally used in slabs are 6 mm, 8 mm, 10 mm, 12mm and 16mm The maximum diameter of bar used in slab should not exceed 1/8 of the total thickness of slab Maximum spacing of
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Construction Peleng
A long run of trench drain on a suspended slab poses some problems For one, saw cutting a long strip of floor to install a drain might weaken the whole floor Make sure that the floor has the necessary reinforcement or structural support to endure the new openingThis design procedure is justified by the results of load tests on largescale subassemblies of suspended slabs A partial application of this approach is the design of composite slabs on steel decking where tests to determine the local performance of fibrereinforced concrete, eg around stud shear connectors, have been used to demonstrate Reinforced concrete beam 100 kg of normal rebar steel Wall, internal element (for instance 180 mm) 35 kg of normal rebar steel Wall, external layer (for instance 70 mm) 80 kg of normal rebar steel or stainless steel Balcony (for instance 260 mm) 125 kg of normal rebar steel
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So maximum diameter of reinforcement bar used in 4 inch (100mm) thick RCC slab is 16mm (5 soot) if thickness of slab is 6 inch (150mm),then maximum diameter of bar used in rcc slab is 150/8 which is equal to 1875mm 1875mm bar not available, So maximum diameter of reinforcement bar used in 6 inch (150mm) thick RCC slab is mm (6 soot)This article is the first in a series on recommended reinforcement details for castinplace concrete construction Twoway slabs are generally defined as suspended slabs where the ratio of the long to the short side of a slab panel is 2 or less In twoway construction, load transfer is , 0235 PM Re Suspended slab over porch The length of each porch is 50 ft, width (actual span across foundation walls) is 6'7" Thickness will be 4" Reinforcement will be wire In the calculations I've done, I'm assuming 50 lb/ft^2 for the slab dry weight (based on a
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This chapter gives guidance on meeting the Technical Requirements for suspended ground floors including those constructed from insitu concrete precast concrete timber joists 521 Compliance 522 Provision of information 523 ContaminantsReinforcement and ceiling system for concrete slabs It is a profile steel sheeting widely accepted by the building and construction industry to offer efficiency and speed of construction New design rules have been developed for the design of BONDEK® acting Suspended Slabs are typically buildup in two ways 1 Precast concrete Unlike onsite concrete pouring, a leading manufacturing approach is used to produce highquality precast concrete in a restrained factory environment The reinforcement is placed in reusable and adjustable molds, and the concrete is poured, vibrated and cured
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5 Things To Look For When Inspecting A Suspended Concrete Slab
Because contraction joints are not used in these slabs, crack width—not crack location—is controlled by reinforcement Reinforcing barsConstruction sequence Questions send it to megadethigorot@gmailcom (No need to subscribe or comment if you don't want to ask in public just send a messag Reinforced concrete slab & Suspended slabs construction A concrete slab is a very important structural element of your house and provides a flat, usable service to build on A suspended slab is a slab that has at least two of its opposite edges supported by walls, beams or columns and are not in direct contact with the ground
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Concrete slabs will also need to be reinforced if local building codes mandate the use of reinforced concrete Where Is Rebar Positioned Within the Slab?Span/depth ratios for reinforced concrete slab design to BS8110 The following table presents limits on slab span/effective depth ratio which can be used to work out the correct thickness for slabs directly at the start of design, without any need for later adjustmentsWhether the rebar is placed near the bottom, middle or top of the slab depends on the eventual use of the slab, the size of rebar used and the distance between joints
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These are typically used in multistorey dwellings for upper floors, but can also be used to good effect on the ground level in hilly terrain By digging out a site, concrete support walls can then be erected to bring the slab height to ground level AdvantagesA slab can be reinforced in two ways depending on its thickness, loads acting use of the structure etc 1) Singly reinforced Here the reinforcement is provided only in the part below the neutral axis ie in the tension zone This is done whenPrecast suspended slabs are constructed by pouring the slab in a formwork on the ground and then lifting the slab into its suspended position in the structure Formwork is installed on top of the struts and beams Reinforcement is assembled on top of the formwork Concrete is then poured into the formwork
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Suspended reinforced concrete slabs are used in many applications in the construction industry The advantage of a suspended reinforced concrete slab is that it is possible to get high strength, but at the same time keep the weight low Concrete slabs can be prefabricated in a factory and then sent to the site, or they can be cast insitu A concrete slab is a structural feature, usually of constant thickness, that can be used as a floor or a roof A slabonground is supported on the subsoil and is usually reinforced with reinforcing bars or welded wire mesh A suspended slab (or structural slab) spans between supports and must be reinforced to resist bending moments calculated from statics based onReinforcement Estimates Typical average weight of reinforcement (kg/m3) in concrete building elements The below figures are for guideline only and may vary for different projects Ribbed floor slabs Slabs – one way Slabs – two way Stairs Tie beams Transfer slabs Walls – normal Walls – wind 135 1100 0
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Composite Concrete/Steel Slab is a slab where steel decking acts as nonrecoverable formwork and partial reinforcement for the floor slab The decking spans one way and will usually be continuous over several supports Single spans are, however, common and acceptable Support is as for insitu floors Precast Concrete Suspended Slab
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