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For example, one-way slab thickness calculation is different and easier from that of two-way slab. Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. ... at least the depth below slab. Slab thickness normally ranges between 12 and 16 inches (305 and 406 mm) for non- prestressed slabs and 10 to 14 inches (254 to 356 mm) for post-tensioned slabs. An isolation joint is needed where the drive is to meet these existing pavements. Unrestrained Beam Thickness Tables Restrained Beam Thickness Tables Description: UL Link: UL PDF: CAD Drawing: All: MK6GF: Z106HY: All: MK6GF: Z106HY Protected Floor/Ceiling 2 1/2" NWC/LWC, Fluted/Cellular: UL D739: PDF: DWG: D739 Unres All: D739 Unres MK6GF: D739 Unres Z106HY: NA: NA: NA 2" NWC/LWC, Fluted/Cellular UL D743: NA: DWG: D743 Unres All In multifamily residential structures, a concrete Podium Slab typically acts as both a structural floor and as a transfer slab for wood and light gauge steel framed construction above. The framing members above the podium are often not coincident with the framing below. All Rights Reserved. "Streses and Stains in Rigid Pavements" (Lecture Notes 3) - by Charles Nunoo, Ph.D., P.E. The size of your bars tend to get smaller as you go up, and sometimes you'll have fewer bars within the column. This may be counterproductive because the weight of the slab may increase shear force significantly. thick or less); and Flatness tolerance: FF or gap under straightedge, depending on the floor profile class. Our first project of this kind was a 140,000-square-foot, 14-inch post-tensioned podium slab. To resist lateral loads, some cores and ... transfer slab) close to podium core; 3) Case 3 which simulates failure of podium edge . VIP members get additional benefits. The thickness of one-way slab is based on Deflection, Bending, Shear, and occasionally Fire resistance requirements. Sometimes, slab Podcast: Behavioral Attributes of an Effective Construction Manager, Chenani-Nashri Tunnel: India's Longest Bi-directional Road Tunnel. The thickness of the Flat slab is minimum 8″ or 0.2m. However, each also has unique requirements in terms of its structural design and detailing. However, these requirements shall be checked in endobj
Load bearing elements such as walls and columns of superstructure above the podium slab may not align with substructure load bearing elements below. Podium designs are one way to maximize the number of stories, increase unit density, and lower construction costs. This is an undesirable consequence. x�����-Kn��H�Յ�я(�%�Sl'sl��_�կA^�3oQ��A�?V�溜�Zkqw� K8}���Y,rq����ה?�������ÿ����?�?�����^�����}m籷�������?�-�����u?>>����.S��%=� �E���GҞO������3HϽ��ܓH�VTz]i���m�#J� �uWi.�JK <>
Typically, the superstructure built from wood, metal studs or structural steel. These strategies include: © 2009-2020 The Constructor. Typically, contractors use 1/4 to 1/2 inch thick premolded joint material to make this joint. The slab thickness . I am designing a Post-Tensioned Podium slab (concrete slab with 4-story wood construction ontop). In general, 6 inch (150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. Lastly, slab thicknesses are usually rounded off to the nearest 10mm. However, the OP was concerned about the design of the podium slab. Multi-story mixed-use and multi-residential projects are usually configured in one of three ways: 1. Methods used for finding slab thickness varies for different types of slabs. supported slabs; L/24 for slabs with one end continuous; L/28 for slabs with both Country endobj
The initial assumption for thickness of the podium slab depends on the number of levels that the slab supports and the concrete strength used. Podium Slab consists of a 1- to 2-story reinforced or post tension concrete podium that allows several stories of light-frame wood framing above it. In such bare podium one can use a spray applied highly elastomeric and puncture-resistant waterproofing coating if podium is very large or else a brush applied pitch modified polyurethane membrane coating can be used in relative smaller podium slabs. s Thickness of slab (T-beam section), in d p Distance from extreme compression fiber to centroid of prestressing steel, in E c Modulus of elasticity of concrete, psi E s Modulus of elasticity of reinforcement, assumed as 29,000,000 psi (ACI 8.5.2) f' c Specified compressive strength of concrete, psi What does typically change with height is the reinforcement within the columns. %PDF-1.4
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The structure in the tower and the podium varies between flat slabs, steel structure for wide spans, a huge shear wall around the tower's core, etc. This design example uses the term “podium slab” which, while not included in the 2006 International Building Code (IBC) or 2007 California Building Code (CBC), is commonly used in the building industry. 5 Ebor Court, Randall Park Way, Retford, Nottinghamshire, DN22 7WF 0800 242 5589 [email protected] Office Hours: Monday to Friday 08.00 – 17.00 Online Chat 24/7 Compute moments using suitable methods such as ACI Coefficient Method. Which instrument is widely used for surveying? Select a country…Åland IslandsAfghanistanAlbaniaAlgeriaAndorraAngolaAnguillaAntarcticaAntigua and BarbudaArgentinaArmeniaArubaAustraliaAustriaAzerbaijanBahamasBahrainBangladeshBarbadosBelarusBelauBelgiumBelizeBeninBermudaBhutanBoliviaBonaire, Saint Eustatius and SabaBosnia and HerzegovinaBotswanaBouvet IslandBrazilBritish Indian Ocean TerritoryBritish Virgin IslandsBruneiBulgariaBurkina FasoBurundiCambodiaCameroonCanadaCape VerdeCayman IslandsCentral African RepublicChadChileChinaChristmas IslandCocos (Keeling) IslandsColombiaComorosCongo (Brazzaville)Congo (Kinshasa)Cook IslandsCosta RicaCroatiaCubaCuraÇaoCyprusCzech RepublicDenmarkDjiboutiDominicaDominican RepublicEcuadorEgyptEl SalvadorEquatorial GuineaEritreaEstoniaEthiopiaFalkland IslandsFaroe IslandsFijiFinlandFranceFrench GuianaFrench PolynesiaFrench Southern TerritoriesGabonGambiaGeorgiaGermanyGhanaGibraltarGreeceGreenlandGrenadaGuadeloupeGuatemalaGuernseyGuineaGuinea-BissauGuyanaHaitiHeard Island and McDonald IslandsHondurasHong KongHungaryIcelandIndiaIndonesiaIranIraqIsle of ManIsraelItalyIvory CoastJamaicaJapanJerseyJordanKazakhstanKenyaKiribatiKuwaitKyrgyzstanLaosLatviaLebanonLesothoLiberiaLibyaLiechtensteinLithuaniaLuxembourgMacao S.A.R., ChinaMacedoniaMadagascarMalawiMalaysiaMaldivesMaliMaltaMarshall IslandsMartiniqueMauritaniaMauritiusMayotteMexicoMicronesiaMoldovaMonacoMongoliaMontenegroMontserratMoroccoMozambiqueMyanmarNamibiaNauruNepalNetherlandsNetherlands AntillesNew CaledoniaNew ZealandNicaraguaNigerNigeriaNiueNorfolk IslandNorth KoreaNorwayOmanPakistanPalestinian TerritoryPanamaPapua New GuineaParaguayPeruPhilippinesPitcairnPolandPortugalQatarRepublic of IrelandReunionRomaniaRussiaRwandaSão Tomé and PríncipeSaint BarthélemySaint HelenaSaint Kitts and NevisSaint LuciaSaint Martin (Dutch part)Saint Martin (French part)Saint Pierre and MiquelonSaint Vincent and the GrenadinesSan MarinoSaudi ArabiaSenegalSerbiaSeychellesSierra LeoneSingaporeSlovakiaSloveniaSolomon IslandsSomaliaSouth AfricaSouth Georgia/Sandwich IslandsSouth KoreaSouth SudanSpainSri LankaSudanSurinameSvalbard and Jan MayenSwazilandSwedenSwitzerlandSyriaTaiwanTajikistanTanzaniaThailandTimor-LesteTogoTokelauTongaTrinidad and TobagoTunisiaTurkeyTurkmenistanTurks and Caicos IslandsTuvaluUgandaUkraineUnited Arab EmiratesUnited Kingdom (UK)United States (US)UruguayUzbekistanVanuatuVaticanVenezuelaVietnamWallis and FutunaWestern SaharaWestern SamoaYemenZambiaZimbabwe, By registering, you agree to the Terms of Service and Privacy Policy .*. Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. You will receive a link and will create a new password via email. If a proper procedure for the calculation of a slab thickness is followed, the design period would be cut considerably, in addition to reaching reliable and economical slab thickness. Otherwise, thickness of one-way slabs must be at least L/20 for simply Long Spans Thicken the slab over the entire panel. Two-way flat plates can be used for span up to 8m using reinforced concrete and up to 11m with the post-tensioned system. Calculate design shear strength of the slab, equation 3. Tuck-under/walk-up 2. (250°F). <>
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Nationwide, there has been an increase in the demand for multi-story mixed-use and multi-residential structures. (for slabs 12 in. Become VIP Member. To see the details of computing minimum slab thickness, please click here. Podium Each configuration offers advantages, and each can be used to achieve a different level of density. The slab thickness chosen must be adequate for shear at both interior and exterior columns. stream
These material savings can easily represent two or more inches of slab thickness reduction along with lighter concrete elements to support it. Thickness of concrete slab depends on loads and size of the slab. R: flexural resistance (MPa) computed using the following expression: W: ultimate distributed load equal My response to the OP's question remains as before, KLL*AT = 1*4*30*30 = 3600 SF. In multifamily residential structures, a concrete Podium Slab typically acts as both a structural floor and as a transfer slab for wood and light gauge steel framed construction above. As such, the podium also serves as a transfer slab to pick up conventional bearing walls above and distribute them to the supporting beams below. The ACI Code sets limitations on slab thickness When designing a typical non-podium slab, i typically design the PT system to balance about 50 - 80% of the dead load of the slab's self weight. This method is applicable for different types of two-way slabs such as flat slab, flat plate, slabs on beams, slabs without interior beams. Title: Standard Detail Notes :-Standard Podium Deck Drainage Detail - Filcor Products :-Drg No. The selection and computation of slab thickness including different types of slabs is a major step in the design process. Podium slabs are unique type of floor system that transfers loads from a steel or wood frame structure above the slab to concrete walls and columns below. 3 0 obj
soil, the slab thickness is selected based on deflection requirements. >>
"Slab Thickness Design for Industrial Concrete Floors on Grade" (IS195.01D) - by Robert G. Packard (Portland Cement Association, 1976) 5. Since then, that’s become common. VIP members get additional benefits. When a concrete slab is stressed by the post-tensioning method, it means the to 1.2*dead load plus 1.6*live load. Also referred to as pedestal or platform buildings, this type of construction These values can be used provided the slabs are not supporting or attached to partitions or other structures liable to be damaged by large deflections. Field Density of Soil by Rubber Balloon Method. endobj
How to Design Continuous Beam and One-way Slab using ACI Approximate Analysis Method? Podium slabs are special type of floor system that transfers loads from a steel or wood frame structure above the slab to walls and columns below. requirements is not frequent. ҲEioAzt�������*���g�� ��������(Az� �[ҳ��}�TT��|�e\� �%H{�NUYң%�NUYҞ���sS�T�%=w�.U�Ҷ�S�SU =��Ҵw�NUY�\�t�ʒ��ң��SU���]�SU���(�Q��
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ҳ��SU����2U1i�T����9AU�6'� If the slab’s shear strength is less than ultimate shear imposed on the slab, then required strategies shall be considered to tackle the problem. How can we use magnetic levitation method in civil engineering? and -1/4 in. Sorry, you do not have permission to ask a question, You must login to ask question. 42 Column Caps 41 42. d: effective depth of the slab needed to withstand moment, b: width of the slab, 1m (12inch) slab strip is considered. You will need to know the design uplift forces from the light-frame structure above the slab and some basic project variables like specified concrete strength, slab thickness(es) and whether the structure is in high seismic or wind-controlled areas. For a two way slab, KLL =1, so Influence Area = Tributary Area. Typically, you’ll start with a slab key plan that shows the anchor bolt locations. This screed is laid over set RCC slab after applying the bonding agent NITOBOND over RCC slab of the podium. Given: Span length along X-X direction = 30’ (9.14 m) Span length along Y-Y direction = 26.25’ (8.0 m) Slab thickness = 8 in (203 mm) Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. Building Post Tensioned Slab . For Thickness tolerance: +3/8 in. Match the new driveway level with the existing garage slab and sidewalk. What is podium slab? This design example uses the term “podium slab” which, while not a term defined in the 2012 International Building Code (IBC) or 2013 California Building Code (CBC), is included in the commentary to §510.2 in the 2012 IBC (509.2 in the 2009 IBC). The inherent ability of PT (post-tensioning) to balance a portion of this load allows the design to work with a thinner concrete section compared to a conventional podium slab. Determination of slab thickness based on bending and shear Apartfrom slabs that are loaded heavily for instance slabs carry several meters ofsoil, the slab thickness is selected based on deflection requirements. from slabs that are loaded heavily for instance slabs carry several meters of this criterion the fire rating of a floor is the number of hours necessary for podium slab detailing. 2 0 obj
What is piping technology for termite treatment in building? The two-way flat plate slab is simply a slab of uniform thickness directly supported on columns, and it is generally suitable for relatively light loads. The basement space has become inefficient as a parking area so I'd like to transfer this whole structure to an 8x8 or 16x16 grid of columns by using the transfer floor/slab. Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. The composite properties of the system have been compromised because the total thickness is 9.25” instead of 10”. Good. the design even if the thickness is selected based on deflection requirements. For a 121.1C (250°F) temperature rise, a 76.2 mm (3-1/2 inch) thick slab gives a 1-hour fire rating, a 127mm (5-in) slab offers a 2-hour fire rating, and a 152.4mm (6-1/4 inch) slab provides a 3-hour fire rating. ACI 117-90 requires no level alignment tolerance for the concrete because levelness depends on … 4 0 obj
�T�#Hs R�*K Use a drop panel to thicken the slab adjacent to the column. What are the purposes for building dams in semi-arid regions? Estimate the deflection of the slab panel identified in part b of the figure under the follwoing conditions. after about one year we see lot of cracks in all directions. ends continuous; and L/10 for cantilevers; where L is the span. The reduced topping thickness might provide insufficient cover for the aggregate and reinforcement, and is more vulnerable to spalling and delamination from the NiCore™ Plank substrate. Calculate trial factored loads based on the slab thickness estimated based on deflection requirements. The ACI Code provides method to compute minimum two-way slab thickness which satisfies deflection. I've worked on a few high rises, and slab thickness pretty much stays the same beyond the transfer slab. <>
Other particulars of the floor system are noted in Appendix A. Mrs. Chillal June 30, 2019 Reply. The ACI Code permits thinner slabs to be used if calculated deflection is within the specified deflection limitations. Common configurations include up to five stories of residential use over retail, commercial, office, and parking occupancies, similar in configuration to the building shown in Figure 1. how to prevent. the temperature of the unexposed surface to rise by a given amount, generally 121.1C �g��{���U�Rڜ�*K Apart This type of construction is also referred to as an uppermost “structural slab” or “transfer slab” (both can have a slab … Podium Slabs 28 Parking Structures 27 28. 3.1 Surface Preparation Removal of all surface imperfections, protrusions, Lost your password? This type of structure has many advantages for the owner, including more head height for the garage under the wood structure and longer spans between columns, lower cost, and, most importantly, a faster overall schedule. Become VIP Member, Do you need to remove the ads? �T�es��,)lNP�%m)J{�es��,�ނ��U��9AU =���E�bs�u.�V�.���}�*�[�%H�t��o%H{�A�[W�Y�JϬҶ�(=� �I�mۃ4� MeWi�A��(��m��>�V� -5H+�n��W`�g�� m��&�W`�#H�}J����yz�%���]�K����?���gX�����i��#hA�j��絤�&i��-H�{Z�R���xI��ۮ�t�G?u��b�^.����/���z�(�=HS��s/-i������)J�X�I��[kَ%m�x�,Cڲ�NP�%=j�NUYR�QH� �����9�*KZ�(ݢt�?UeIK�yR�Q�%Mg��(�截,��T�TeJUsDU MA�k��截,�qD���Q�%�K��=H�9���t�Ӹ. Thickness of slab = 250 mm Dimension of column = 450 x 230 mm Reinforcement of slab in the longer direction = H16@150mm (A s,prov = 1340 mm 2) Reinforcement of slab in the shorter direction = H16@175mm (A s,prov = 1149 mm 2) Grade of concrete = C30 Yield strength of reinforcement = 500 Mpa Concrete cover to slab = 25mm Design of Post‐Tensioning Building ... ‐Project below slab at least 1/4 slab thickness. unless deflections are calculated How to Design Continuous Beam and One-way Slab using ACI ... Types of Foundation for Buildings and their Uses [PDF], Methods of Rainwater Harvesting [PDF]: Components, Transport, and Storage, Compressive Strength of Concrete -Cube Test [PDF], Procedure, Results, 16 Types of Heavy Equipment Used in Construction, Standard Size of Rooms in Residential Building and their Locations. Please enter your email address. Wrap-around 3. Generally, this type of slab constructed and placed at gr… 1 0 obj
Mrs. Chillal June 30, 2019 Reply. 44 Drop Panels 43 44. Measure for elevation and double check the base to insure uniform slab thickness. Get in Touch. Which type of reinforcement are used in pre-stressing? The code-prescribed fire resistance rating is typically 2-hours or 3-hours. Generally, the slab thickness is chosen to prevent excessive deflection in service. <>
If all spans are equal, the ultimate shear occurs at the exterior face of first interior slab, which is computed using equation 4, otherwise shears should be checked at the exterior face of first interior slab and typical interior slab, equation 5. for podium and tower floors was 30 cm thick. Podium deck / slab Drainage layer by others Site-formed drainage holes filled with granular material eg : pea shingle Waterproofing layer by others Drainage outlets by others Tel : 01403 799600 Email : techsupport@cordek.com Drg. Basic Concepts of Pre-stressing: "Prestressed concrete is basically concrete in which internal stresses of a suitable magnitude and distribution are introduced so that the stresses resulting from external loads are counteracted to a desired degree. Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. Similar to the one-way slab, the thickness of two-way slab should satisfy deflection and shear requirements. thicknesses are controlled by the danger of heat transmission during fire. What is the Minimum Curing Period for Concrete? 5 0 obj
and determined to be acceptable. In multifamily residential structures, a concrete Podium Slab typically acts as both a structural floor and as a transfer slab for wood and light gauge steel framed construction above.