this criterion the fire rating of a floor is the number of hours necessary for In general, 6 inch (150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. The thickness of one-way slab is based on Deflection, Bending, Shear, and occasionally Fire resistance requirements. 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. Podcast: Behavioral Attributes of an Effective Construction Manager, Chenani-Nashri Tunnel: India's Longest Bi-directional Road Tunnel. Title: Standard Detail Notes :-Standard Podium Deck Drainage Detail - Filcor Products :-Drg No. 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. d: effective depth of the slab needed to withstand moment, b: width of the slab, 1m (12inch) slab strip is considered. My response to the OP's question remains as before, KLL*AT = 1*4*30*30 = 3600 SF. "Streses and Stains in Rigid Pavements" (Lecture Notes 3) - by Charles Nunoo, Ph.D., P.E. For ҲEioAzt�������*���g�� ��������(Az� �[ҳ��}�TT��|�e\� �%H{�NUYң%�NUYҞ���sS�T�%=w�.U�Ҷ�S�SU =��Ҵw�NUY�\�t�ʒ��ң��SU���]�SU���(�Q�� .UYҽ�T�%=r ҳ��SU����2U1i�T����9AU�6'� 3.1 Surface Preparation Removal of all surface imperfections, protrusions, The initial assumption for thickness of the podium slab depends on the number of levels that the slab supports and the concrete strength used. The framing members above the podium are often not coincident with the framing below. For a two way slab, KLL =1, so Influence Area = Tributary Area. how to prevent. 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) Thickness of concrete slab depends on loads and size of the slab. What is the Minimum Curing Period for Concrete? How can we use magnetic levitation method in civil engineering? 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. Generally, this type of slab constructed and placed at gr… You will receive a link and will create a new password via email. Determination of slab thickness based on bending and shear 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 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. Podium designs are one way to maximize the number of stories, increase unit density, and lower construction costs. Building Post Tensioned Slab . When a concrete slab is stressed by the post-tensioning method, it means the What is piping technology for termite treatment in building? Since then, that’s become common. <> Podium Each configuration offers advantages, and each can be used to achieve a different level of density. 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. Generally, the slab thickness is chosen to prevent excessive deflection in service. Which instrument is widely used for surveying? This is an undesirable consequence. (250°F). 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. 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. VIP members get additional benefits. Nationwide, there has been an increase in the demand for multi-story mixed-use and multi-residential structures. An isolation joint is needed where the drive is to meet these existing pavements. Apartfrom slabs that are loaded heavily for instance slabs carry several meters ofsoil, the slab thickness is selected based on deflection requirements. and determined to be acceptable. Become VIP Member, Do you need to remove the ads? Long Spans Mrs. Chillal June 30, 2019 Reply. 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. Thicken the slab over the entire panel. This method is applicable for different types of two-way slabs such as flat slab, flat plate, slabs on beams, slabs without interior beams. 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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. The slab thickness chosen must be adequate for shear at both interior and exterior columns. and -1/4 in. supported slabs; L/24 for slabs with one end continuous; L/28 for slabs with both stream Field Density of Soil by Rubber Balloon Method. This type of construction is also referred to as an uppermost “structural slab” or “transfer slab” (both can have a slab … Load bearing elements such as walls and columns of superstructure above the podium slab may not align with substructure load bearing elements below. Sorry, you do not have permission to ask a question, You must login to ask question. 5 0 obj <> I am designing a Post-Tensioned Podium slab (concrete slab with 4-story wood construction ontop). Podium Slabs 28 Parking Structures 27 28. unless deflections are calculated requirements is not frequent. 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. %PDF-1.4 %���� <> This screed is laid over set RCC slab after applying the bonding agent NITOBOND over RCC slab of the podium. The selection and computation of slab thickness including different types of slabs is a major step in the design process. 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 What is podium slab? Lost your password? Mrs. Chillal June 30, 2019 Reply. Tuck-under/walk-up 2. Calculate design shear strength of the slab, equation 3. soil, the slab thickness is selected based on deflection requirements. endobj to 1.2*dead load plus 1.6*live load. Typically, you’ll start with a slab key plan that shows the anchor bolt locations. The ACI Code permits thinner slabs to be used if calculated deflection is within the specified deflection limitations. All Rights Reserved. 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. For example, one-way slab thickness calculation is different and easier from that of two-way slab. 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. The slab thickness . I've worked on a few high rises, and slab thickness pretty much stays the same beyond the transfer slab. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. thicknesses are controlled by the danger of heat transmission during fire. 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. 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 44 Drop Panels 43 44. �g��{���U�Rڜ�*K These strategies include: © 2009-2020 The Constructor. <> >> To resist lateral loads, some cores and ... transfer slab) close to podium core; 3) Case 3 which simulates failure of podium edge . 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. Multi-story mixed-use and multi-residential projects are usually configured in one of three ways: 1. Calculate trial factored loads based on the slab thickness estimated based on deflection requirements. "Slab Thickness Design for Industrial Concrete Floors on Grade" (IS195.01D) - by Robert G. Packard (Portland Cement Association, 1976) 5. Other particulars of the floor system are noted in Appendix A. VIP members get additional benefits. ... at least the depth below slab. The composite properties of the system have been compromised because the total thickness is 9.25” instead of 10”. 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. Use a drop panel to thicken the slab adjacent to the column. Also referred to as pedestal or platform buildings, this type of construction after about one year we see lot of cracks in all directions. The ACI Code provides method to compute minimum two-way slab thickness which satisfies deflection. 3 0 obj 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. 42 Column Caps 41 42. Apart Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. R: flexural resistance (MPa) computed using the following expression: W: ultimate distributed load equal These material savings can easily represent two or more inches of slab thickness reduction along with lighter concrete elements to support it. 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. Sometimes, slab the temperature of the unexposed surface to rise by a given amount, generally 121.1C Country the design even if the thickness is selected based on deflection requirements. �T�#Hs R؜�*K Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. What are the purposes for building dams in semi-arid regions? <> endobj However, each also has unique requirements in terms of its structural design and detailing. (for slabs 12 in. Design of Post‐Tensioning Building ... ‐Project below slab at least 1/4 slab thickness. ACI 117-90 requires no level alignment tolerance for the concrete because levelness depends on … Two-way flat plates can be used for span up to 8m using reinforced concrete and up to 11m with the post-tensioned system. Our first project of this kind was a 140,000-square-foot, 14-inch post-tensioned 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). Which type of reinforcement are used in pre-stressing? 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. 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. 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. Wrap-around 3. 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. endobj Thickness tolerance: +3/8 in. Otherwise, thickness of one-way slabs must be at least L/20 for simply 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. thick or less); and Flatness tolerance: FF or gap under straightedge, depending on the floor profile class. for podium and tower floors was 30 cm thick. 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. from slabs that are loaded heavily for instance slabs carry several meters of Compute moments using suitable methods such as ACI Coefficient Method. Methods used for finding slab thickness varies for different types of slabs. Lastly, slab thicknesses are usually rounded off to the nearest 10mm. What does typically change with height is the reinforcement within the columns.
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