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) Load bearing elements such as walls and columns of superstructure above the podium slab may not align with substructure load bearing elements below. 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. The ACI Code provides method to compute minimum two-way slab thickness which satisfies deflection. Generally, this type of slab constructed and placed at gr… Podium Slabs 28 Parking Structures 27 28. The thickness of the Flat slab is minimum 8″ or 0.2m. Thickness of concrete slab depends on loads and size of the slab. supported slabs; L/24 for slabs with one end continuous; L/28 for slabs with both Calculate trial factored loads based on the slab thickness estimated based on deflection requirements. for podium and tower floors was 30 cm thick. Similar to the one-way slab, the thickness of two-way slab should satisfy deflection and shear requirements. %PDF-1.4 %���� �g��{���U�Rڜ�*K 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. thick or less); and Flatness tolerance: FF or gap under straightedge, depending on the floor profile class. 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. and determined to be acceptable. how to prevent. 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. Determination of slab thickness based on bending and shear Country The slab thickness chosen must be adequate for shear at both interior and exterior columns. How to Design Continuous Beam and One-way Slab using ACI Approximate Analysis Method? 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. 5 0 obj the temperature of the unexposed surface to rise by a given amount, generally 121.1C Generally, the slab thickness is chosen to prevent excessive deflection in service. 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 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. 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 Sometimes, slab <> 2 0 obj ends continuous; and L/10 for cantilevers; where L is the span. The size of your bars tend to get smaller as you go up, and sometimes you'll have fewer bars within the column. requirements is not frequent. 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. �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. Tuck-under/walk-up 2. Nationwide, there has been an increase in the demand for multi-story mixed-use and multi-residential structures. The selection and computation of slab thickness including different types of slabs is a major step in the design process. 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 Title: Standard Detail Notes :-Standard Podium Deck Drainage Detail - Filcor Products :-Drg No. 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. soil, the slab thickness is selected based on deflection requirements. An isolation joint is needed where the drive is to meet these existing pavements. Podcast: Behavioral Attributes of an Effective Construction Manager, Chenani-Nashri Tunnel: India's Longest Bi-directional Road Tunnel. 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. Methods used for finding slab thickness varies for different types of slabs. endobj (for slabs 12 in. The thickness of one-way slab is based on Deflection, Bending, Shear, and occasionally Fire resistance requirements. The slab thickness . 44 Drop Panels 43 44. Typically, contractors use 1/4 to 1/2 inch thick premolded joint material to make this joint. All Rights Reserved. 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. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. The ACI Code permits thinner slabs to be used if calculated deflection is within the specified deflection limitations. Otherwise, thickness of one-way slabs must be at least L/20 for simply 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. Since then, that’s become common. This may be counterproductive because the weight of the slab may increase shear force significantly. 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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. Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. What is podium slab? 4 0 obj "Slab Thickness Design for Industrial Concrete Floors on Grade" (IS195.01D) - by Robert G. Packard (Portland Cement Association, 1976) 5. To see the details of computing minimum slab thickness, please click here. 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. Become VIP Member. stream VIP members get additional benefits. Typically, the superstructure built from wood, metal studs or structural steel. Building Post Tensioned Slab . For a two way slab, KLL =1, so Influence Area = Tributary Area. podium slab detailing. 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. Please enter your email address. Our first project of this kind was a 140,000-square-foot, 14-inch post-tensioned podium slab. What does typically change with height is the reinforcement within the columns. Field Density of Soil by Rubber Balloon Method. What is piping technology for termite treatment in building? 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. and -1/4 in. In general, 6 inch (150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. Use a drop panel to thicken the slab adjacent to the column. This type of construction is also referred to as an uppermost “structural slab” or “transfer slab” (both can have a slab … You will receive a link and will create a new password via email. Which instrument is widely used for surveying? 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 Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. However, the OP was concerned about the design of the podium slab. 3 0 obj Lastly, slab thicknesses are usually rounded off to the nearest 10mm. ACI 117-90 requires no level alignment tolerance for the concrete because levelness depends on … This method is applicable for different types of two-way slabs such as flat slab, flat plate, slabs on beams, slabs without interior beams. Long Spans However, these requirements shall be checked in >> Measure for elevation and double check the base to insure uniform slab thickness. This is an undesirable consequence. Get in Touch. after about one year we see lot of cracks in all directions. The ACI Code sets limitations on slab thickness 42 Column Caps 41 42. <> Calculate design shear strength of the slab, equation 3. These strategies include: © 2009-2020 The Constructor. 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). 3.1 Surface Preparation Removal of all surface imperfections, protrusions, Lost your password? The initial assumption for thickness of the podium slab depends on the number of levels that the slab supports and the concrete strength used. How can we use magnetic levitation method in civil engineering? Which type of reinforcement are used in pre-stressing? Typically, you’ll start with a slab key plan that shows the anchor bolt locations. 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 Design of Post‐Tensioning Building ... ‐Project below slab at least 1/4 slab thickness. to 1.2*dead load plus 1.6*live load. ... at least the depth below slab. "Streses and Stains in Rigid Pavements" (Lecture Notes 3) - by Charles Nunoo, Ph.D., P.E. Become VIP Member, Do you need to remove the ads? Two-way flat plates can be used for span up to 8m using reinforced concrete and up to 11m with the post-tensioned system. This screed is laid over set RCC slab after applying the bonding agent NITOBOND over RCC slab of the podium. Also referred to as pedestal or platform buildings, this type of construction Mrs. Chillal June 30, 2019 Reply. 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. I am designing a Post-Tensioned Podium slab (concrete slab with 4-story wood construction ontop). Podium Each configuration offers advantages, and each can be used to achieve a different level of density. from slabs that are loaded heavily for instance slabs carry several meters of <> For example, one-way slab thickness calculation is different and easier from that of two-way slab. However, each also has unique requirements in terms of its structural design and detailing. 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. Sorry, you do not have permission to ask a question, You must login to ask question. 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. endobj 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. 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. The framing members above the podium are often not coincident with the framing below. 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. For (250°F). Thickness tolerance: +3/8 in. Estimate the deflection of the slab panel identified in part b of the figure under the follwoing conditions. Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. 1 0 obj VIP members get additional benefits. What are the purposes for building dams in semi-arid regions? 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. These material savings can easily represent two or more inches of slab thickness reduction along with lighter concrete elements to support it. R: flexural resistance (MPa) computed using the following expression: W: ultimate distributed load equal 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. <> My response to the OP's question remains as before, KLL*AT = 1*4*30*30 = 3600 SF.