Multi-story mixed-use and multi-residential projects are usually configured in one of three ways: 1. 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You will receive a link and will create a new password via email. Lost your password? Also referred to as pedestal or platform buildings, this type of construction For example, one-way slab thickness calculation is different and easier from that of two-way slab. 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. These strategies include: © 2009-2020 The Constructor. Wrap-around 3. ends continuous; and L/10 for cantilevers; where L is the span. 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 The thickness of one-way slab is based on Deflection, Bending, Shear, and occasionally Fire resistance requirements. Typically, contractors use 1/4 to 1/2 inch thick premolded joint material to make this joint. thicknesses are controlled by the danger of heat transmission during fire. stream The initial assumption for thickness of the podium slab depends on the number of levels that the slab supports and the concrete strength used. 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. Typically, you’ll start with a slab key plan that shows the anchor bolt locations. 2 0 obj 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. 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. The ACI Code permits thinner slabs to be used if calculated deflection is within the specified deflection limitations. These material savings can easily represent two or more inches of slab thickness reduction along with lighter concrete elements to support it. 42 Column Caps 41 42. Otherwise, thickness of one-way slabs must be at least L/20 for simply The slab thickness chosen must be adequate for shear at both interior and exterior columns. All Rights Reserved. (250°F). Mrs. Chillal June 30, 2019 Reply. 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. VIP members get additional benefits. "Streses and Stains in Rigid Pavements" (Lecture Notes 3) - by Charles Nunoo, Ph.D., P.E. after about one year we see lot of cracks in all directions. However, these requirements shall be checked in However, the OP was concerned about the design of the podium slab. Since then, that’s become common. Use a drop panel to thicken the slab adjacent to the column. Become VIP Member. <> What is podium slab? Nationwide, there has been an increase in the demand for multi-story mixed-use and multi-residential structures. Calculate trial factored loads based on the slab thickness estimated based on deflection requirements. The framing members above the podium are often not coincident with the framing below. What does typically change with height is the reinforcement within the columns. 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 the temperature of the unexposed surface to rise by a given amount, generally 121.1C For a two way slab, KLL =1, so Influence Area = Tributary Area. 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. How can we use magnetic levitation method in civil engineering? ACI 117-90 requires no level alignment tolerance for the concrete because levelness depends on … Compute moments using suitable methods such as ACI Coefficient Method. 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 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. This type of construction is also referred to as an uppermost “structural slab” or “transfer slab” (both can have a slab … Country I've worked on a few high rises, and slab thickness pretty much stays the same beyond the transfer slab. 3 0 obj from slabs that are loaded heavily for instance slabs carry several meters of Typically, the superstructure built from wood, metal studs or structural steel. How to Design Continuous Beam and One-way Slab using ACI Approximate Analysis Method? "Slab Thickness Design for Industrial Concrete Floors on Grade" (IS195.01D) - by Robert G. Packard (Portland Cement Association, 1976) 5. Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. Measure for elevation and double check the base to insure uniform slab thickness. Podcast: Behavioral Attributes of an Effective Construction Manager, Chenani-Nashri Tunnel: India's Longest Bi-directional Road Tunnel. 1 0 obj 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. Podium Each configuration offers advantages, and each can be used to achieve a different level of density. 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. 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. Thickness of concrete slab depends on loads and size of the slab. To resist lateral loads, some cores and ... transfer slab) close to podium core; 3) Case 3 which simulates failure of podium edge . d: effective depth of the slab needed to withstand moment, b: width of the slab, 1m (12inch) slab strip is considered. The ACI Code provides method to compute minimum two-way slab thickness which satisfies deflection. <> Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. 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. Building Post Tensioned Slab . An isolation joint is needed where the drive is to meet these existing pavements. the design even if the thickness is selected based on deflection requirements. 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 The thickness of the Flat slab is minimum 8″ or 0.2m. 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. 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. Design of Post‐Tensioning Building ... ‐Project below slab at least 1/4 slab thickness. podium slab detailing. My response to the OP's question remains as before, KLL*AT = 1*4*30*30 = 3600 SF. 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. thick or less); and Flatness tolerance: FF or gap under straightedge, depending on the floor profile class. This screed is laid over set RCC slab after applying the bonding agent NITOBOND over RCC slab of the podium. Calculate design shear strength of the slab, equation 3. to 1.2*dead load plus 1.6*live load. The code-prescribed fire resistance rating is typically 2-hours or 3-hours. endobj Determination of slab thickness based on bending and shear The selection and computation of slab thickness including different types of slabs is a major step in the design process. 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). Get in Touch. 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. Podium designs are one way to maximize the number of stories, increase unit density, and lower construction costs.
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