The paper presents a detailed analysis of the mechanisms responsible for the loss of loadbearing capacity of hollowcore slabs when exposed to. Figures in shaded areas require additional shear strength from the standard product. Span of slabs varied from 5m upto 18m placed simply supported over beams. We asked structural engineering professional lasse rajala, business unit director at sweco, to explain the secret behind its success. They are manufactured using high tensile strength prestressed strands or single wire which are embedded. They are the ideal choice for constructing floors in individual homes, both at ground level and upper level. A hollow core slab, also known as a voided slab, hollow core plank or simply a concrete plank is a precast slab of prestressed concrete typically used in the construction of floors in multistory apartment buildings. Hollowcore residential applications county materials. The voids in each slab usually have a diameter that is equal to approximately 23 to 34 of the slab section, while the thickness of each plank is. Adobe acrobat reader is free and can be downloaded here. Hollow core slab checking adds a check to model checker suite allowing you to perform various checks specific for hollow core slabs. Title \\server\ hollow core \cameron\brochure pages\brochure details hollow core model 1 author. Manual for the design of hollow core slabs second edition by donald r.
Hcs are advanced products in the prestressed precast concrete industry, especially in terms of efficient use of material low selfweight, and given their high quality due to the efficient production line manufacturing process. The comparison between the experimental and numerical investigations gave insight into the fire performance of hplwc hollow core slabs and enlightened on the phenomena governing their fire resistance. The slab has been especially popular in countries where the emphasis of home construction has been on precast concrete, including northern europe and former socialist countries of. The flexural behavior of this type of slabs have not been investigated in detail in the past. Cast insitu concrete toppings are added to precast slab for. The hollow core slab in practice will be supported on bottom flange of iprofile with welded plate on bottom in one side and another by rhs beam with welded plate on bottom. Hollowcore slab precast slab depth mm structural topping depth mm total depth mm self weight knsq. Maximize space in any house plan with hollowcore roof and floor systems.
Less is more with hollowcore slabs the good old hollowcore slab has managed to remain one of the most common floor and roof slabs over the years. The hollow core slab specific checking includes following checks. The figures shown in the load table are based on the capacity of the slab governed by flexural strength. Large voids can be provided at the longitudinal joint to comfort reinforcing ties. If the length of the cutout is more than 50 cm, it is necessary to use lateral enforcement a1 and longitudinal a2. It suits for use at precast plants and design offices alike. Motivation there is an interest in using the buildings concrete slab as tes. When designing these structures, the deformation of the slabs should be taken into account, resulting from the increase of beams deflection. Production of extruded hollw core slabs lifting the slabs transport to the yard slab placement at the site 01 february 20 6 hollow core slabs hollow core slabs have a considerable flexibility. Hollow core slabs hcs were developed in the 1950s when longline prestressing techniques evolved. The depth of each slab usually ranges from 110 mm to 400 mm with spans typically available up to 200 meters. Download 405 hollow core slab stock photos for free or amazingly low rates. Special purpose panels console panels which in upper layer are reinforced with rated prestressed cables or wires can be used for diversifying the facade surfaces of buildings either for making balconies, verandas or other console structure elements.
Create extra living and storage space by using a homes entire footprint, even neglected space available under a garage, porch or stoop. Voids do not update when the width of the hollow core slab is modified. Failure modes and shear design of prestressed hollow core. Each cad and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or realworld item, product, or good it may purport to portray. Units are installed with or without a structural screed, depending on requirements. Hollow core floors are used due to their lower cost and quick erection time. Zeroslump, highstrength concrete with a 28day strength in excess of 8,000 psi and. Hollow core concrete slabs have many advantages over the conventional solid concrete slabs. Mnl126 manual for the design of hollow core slabs free pdf. Fire ratings will also be improved if the plank assembly is restrained against thermal expansion. Hollow core detention vaults 2020 concrete technology.
Hollow core slab properties prop imperial metric a 235. Hollowcore commercial applications county materials. As betoneks manufactures six different types of hollow core slabs. Using this unique slab will not only reduce building costs but will also reduce the overall weight of a structure. Specialized beams of precast prestressed concrete or steel create shallow floor systems supported on precast columns. Bolted connections under hollowcore slabs, steel beam. The topping may increase the flexural strength, shear strength, and bending stiffness of the slab if composite action is developed with the hollowcore units. Our prestressed hollowcore slabs, also called hollow core planks, concrete planks or voided slabs, are available in a variety of lengths and thicknesses. Jun 06, 2014 hollow core slabs are prestressed concrete elements that have a constant cross section. Pdf design aids for precast ordinary reinforced and prestressed. As an added benefit, the hollow core slabs will eliminate the need to drill the slab for electrical and mechanical runs.
Hoogenboom delft university of technology, faculty of civil engineering and geosciences, delft, the netherlands this paper provides a procedure for finite element analysis of hollowcore slab floors, which may be necessary in case of large floor openings. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. Interactive 3d pdf files look exactly like the original 3d design, regardless of the application used to create it or the environment in which its viewed. Since concrete slab is common in the basement or garage of north american houses, designing and utilizing a ventilated concrete slab vcs with proper control strategy is viable and does not increase the construction costs 14. Hollow core concrete slab is a versatile precast element. Hollowcore slabs vary by depth, length and loading performance with the standard width of a slab being 1200mm.
Hollow core slab properties prop imperial metric a 290. Hoogenboom delft university of technology, faculty of civil engineering and geosciences, delft, the netherlands this paper provides a procedure for finite element analysis of hollow core slab floors, which may be necessary in case of large floor openings. This comprehensive and easy to use resource has been divided up into the different project stages design approach, preplanning, preliminary design, final. They are manufactured using high tensile strength prestressed strands or. Details are available in both adobe acrobat reader pdf and cad dxf format. Hi chan kok tiong, structural bridge design is intended to be used for the structural analysis and design of bridges to bs5400, eurocode 2, aashto and as5100, but the methods are generally very similar to those for buildings so with a little bit of engineering judgment it may be possible to use the software to carry out the calculations for hollow core slabs used in building construction. To obtain a higher slab thickness, normal carbonate concrete field topping can be added to gain a higher total slab thickness. The longspan capability is ideal for offices, retail or car park developments. A structural topping can increase that up to a 4hour rating.
Since concrete slab is common in the basement or garage of north american houses, designing and utilizing a ventilated concrete slab vcs with proper control strategy is viable. Therefore, we meet the requirement for a 3 hour slab thickness, but the strand clear cover needs to be met too. Pcimanual for the design of hollow core slabs second edition bydonald r. Hollow core slab cylinder strength at transfer, fci 250 kgcm2 cylinder strength at 28 days, fc 400 kgcm2. Hollow core slabs provide considerable benefits to builders and house owners. It is generally used in the construction of floors for highrise apartments or multi storey buildings.
Oct 11, 2016 hi chan kok tiong, structural bridge design is intended to be used for the structural analysis and design of bridges to bs5400, eurocode 2, aashto and as5100, but the methods are generally very similar to those for buildings so with a little bit of engineering judgment it may be possible to use the software to carry out the calculations for hollow core slabs used in building construction. Hollowcore is a prestressed concrete flat slab containing continuous. The slab has been especially popular in countries where the emphasis of home construction has been on precast concrete, including. This bundle contains all 32 pcirecommended hollowcore details. Hollowcore flooring technical manual 2003 hollowcore flooring is a technical manual covering the design and construction of projects utilising precast hollowcore flooring. Hollow core slabs are prestressed, precast concrete slabs, with hollow portions in the regions of zero stresses. Topping concrete cylinder strength at 28 days, fct 240 kgcm2. Hollow core slabs precast india infrastructures pvt. Run the numbers and estimate your next project in oldcastle precast hollowcore plank. The notable fire resistance tests on precast, prestressed concrete hollowcore slab were performed by abrams, 6 borgogno et al. Precast concrete is highly fireresistant and an excellent material for compartmentalization as it slows the.
The lightweight nature of the product allows erection by. Simplified crosssection is a geometrically equivalent crosssection to normal crosssection. As more residential covenants dictate restrictions, hollowcore helps home owners gain more usable space. Fire resistance of extruded hollowcore slabs dtu orbit. The hollow core slab has a variety of uses, including floors and roofs for. Fast process with elislab, no time is wasted for going back and forth between different programs and documents. A hollow core slab is a precast, prestressed concrete with continuous voids. Hollowcore slabs with castinplace concrete toppings. Hollow core slab stock photos download 405 royalty free. Applications of active hollow core slabs and insulated. Mar 03, 2016 the common method of constructing hollow core slab is by using high strength, zero slump concrete which is reinforced by using high tensilestrength, prestressing wire strands of 9 mm diameter.
Saccoman, chairpersonjames beerbower ernest marklekevin boyle james marklejeffrey butler milo j. Hollow core slabs are prestressed concrete elements that have a constant cross section. Hollow core slabs for detention vaults are generally untopped and the 12. Savings in cost and time will keep your project on time and under budget. Pci manual for the design of hollow core slabs and walls, 3rd edition free pdf download mnl12615 this manual presents in detail design of hollow core slabs for gravity and lateral loads. Quality assurance of hollow core slab floors pdf fip reports 1992. As it is complicated to do that in robot, i will just use the default setting in robot, i.
Pci manual for the design of hollow core slabs and walls. Hollowcore flooring is a precast prestressed concrete slab with tubular voids which run through the full length of the slab, thereby reducing the weight of the unit. Panels with the heights of 150, 220, 265 mm designation bep are manufactured using extruding method, i. A hollow core slab refers to a precast slab that is prepared using prestressed concrete. A complete revision of the diaphragm chapter includes the latest design information. The contract documents must clearly indicate design criteria to which the hollow core slabs must conform. The end edge of slabs may be of geometric shape oblique or stepped sawing provided in the project. Saccoman, chairperson james beerbower ernest markle kevin boyle james markle jeffrey butler milo j. Download your reinforcement strand calculation demo from the link below. Setting hollowcore slabs on bearing walls forms the necessary fire. However, the slabs can be manufactured to suit the specifications of your construction project.
Continuous voids in the planks reduce their overall weight and help keep building costs in check. Minimum and maximum length of slabs, minimum end angles of slabs, proper width of narrow slabs. Create a hollow core type family revit products 2018. Mar 27, 20 transmission class rating ranges from about 47 to 57 without topping and the impact insulation1. Hollowcore is the product of choice in structures that require sound barriers between floors, excellent fire and earthquake resistance, heat insulation characteristics, long spans, and is therefore widely used in hotels, schools, multistorey car parks, high rise buildings and. In order to view pdf documents, you must have adobe acrobat reader installed. Slabs arrive onsite with a smooth prefinished soffit. Pci manual for the design of hollow core slabs second edition by donald r.
The hollow core slab is manufactured in a standard 4 width and 8, 12, and 12. Used as roof and intermediate floor formers in building the industrial, business and nonresidential facilities and residential buildings. Pdf the application and design of precast, prestressed hollow core slabs is similar to that of other prestressed members. Prepared for the pci hollow core slab producers committee john e. Performing design checks over simplified model saves considerable time without compromising at the quality of output. Hollow core slab is a complex geometric entity that takes long time for design checks. Formulas for homogenisation of the floor properties. Other topping materials such as gypcrete can be added to achieve a fire endurance using different tables. The common method of constructing hollow core slab is by using high strength, zero slump concrete which is reinforced by using high tensilestrength, prestressing wire strands of 9 mm diameter. The topping may increase the flexural strength, shear strength, and bending stiffness of the slab if composite action is developed with the hollow core units. Hollowcore gets its strength from pretensioned steel strands that are embedded in high strength concrete. Hollowcore slabs have excellent span capabilities, achieving a capacity of 2. Jun, 2016 best 2in1 precast plant extruder slipformer slab pagar lintel piles.
Feasibility of construction with hollowcore concrete slabs. Less is more with hollowcore slabs concrete issues. Feasibility of construction with hollowcore concrete. Dxf files can be imported directly into many common cad programs. Hollow core plank technical guide temperatures are based on the amount of concrete cover and the standard fire exposure as defined by the timetemperature relationship specified in astm e119. Pdf design analysis of prestressed hollow core slabs on flexible.
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