Wrap-around 3. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. <> Other particulars of the floor system are noted in Appendix A. Mrs. Chillal June 30, 2019 Reply. What is podium slab? 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 selection and computation of slab thickness including different types of slabs is a major step in the design process. What are the purposes for building dams in semi-arid regions? What is the Minimum Curing Period for Concrete? Compute moments using suitable methods such as ACI Coefficient Method. Sometimes, slab The size of your bars tend to get smaller as you go up, and sometimes you'll have fewer bars within the column. R: flexural resistance (MPa) computed using the following expression: W: ultimate distributed load equal Tuck-under/walk-up 2. �g��{���U�Rڜ�*K 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 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. �T�#Hs R؜�*K "Streses and Stains in Rigid Pavements" (Lecture Notes 3) - by Charles Nunoo, Ph.D., P.E. These strategies include: © 2009-2020 The Constructor. Calculate trial factored loads based on the slab thickness estimated based on deflection requirements. endobj How can we use magnetic levitation method in civil engineering? To see the details of computing minimum slab thickness, please click here. Design of Post‐Tensioning Building ... ‐Project below slab at least 1/4 slab thickness. "Slab Thickness Design for Industrial Concrete Floors on Grade" (IS195.01D) - by Robert G. Packard (Portland Cement Association, 1976) 5. VIP members get additional benefits. endobj 3.1 Surface Preparation Removal of all surface imperfections, protrusions, All Rights Reserved. Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. Apartfrom slabs that are loaded heavily for instance slabs carry several meters ofsoil, the slab thickness is selected based on deflection requirements. soil, the slab thickness is selected based on deflection requirements. The slab thickness chosen must be adequate for shear at both interior and exterior columns. For example, one-way slab thickness calculation is different and easier from that of two-way slab. The thickness of one-way slab is based on Deflection, Bending, Shear, and occasionally Fire resistance requirements. Typically, you’ll start with a slab key plan that shows the anchor bolt locations. The initial assumption for thickness of the podium slab depends on the number of levels that the slab supports and the concrete strength used. For the temperature of the unexposed surface to rise by a given amount, generally 121.1C Title: Standard Detail Notes :-Standard Podium Deck Drainage Detail - Filcor Products :-Drg No. 4 0 obj 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. This is an undesirable consequence. What is piping technology for termite treatment in building? <> Typically, contractors use 1/4 to 1/2 inch thick premolded joint material to make this joint. 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. podium slab detailing. Podium Each configuration offers advantages, and each can be used to achieve a different level of density. Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. 42 Column Caps 41 42. Podium designs are one way to maximize the number of stories, increase unit density, and lower construction costs. Lost your password? 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. and -1/4 in. Load bearing elements such as walls and columns of superstructure above the podium slab may not align with substructure load bearing elements below. 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. Become VIP Member, Do you need to remove the ads? The thickness of the Flat slab is minimum 8″ or 0.2m. 3 0 obj 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. The ACI Code provides method to compute minimum two-way slab thickness which satisfies deflection. Which type of reinforcement are used in pre-stressing? 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. �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. I've worked on a few high rises, and slab thickness pretty much stays the same beyond the transfer slab. Thicken the slab over the entire panel. 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. Apart My response to the OP's question remains as before, KLL*AT = 1*4*30*30 = 3600 SF. Thickness tolerance: +3/8 in. This may be counterproductive because the weight of the slab may increase shear force significantly. I am designing a Post-Tensioned Podium slab (concrete slab with 4-story wood construction ontop). 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. Generally, this type of slab constructed and placed at gr… Sorry, you do not have permission to ask a question, You must login to ask question. You will receive a link and will create a new password via email. Good. 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'� 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 supported slabs; L/24 for slabs with one end continuous; L/28 for slabs with both The framing members above the podium are often not coincident with the framing below. 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. 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. 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 method is applicable for different types of two-way slabs such as flat slab, flat plate, slabs on beams, slabs without interior beams. To resist lateral loads, some cores and ... transfer slab) close to podium core; 3) Case 3 which simulates failure of podium edge . from slabs that are loaded heavily for instance slabs carry several meters of for podium and tower floors was 30 cm thick. Our first project of this kind was a 140,000-square-foot, 14-inch post-tensioned podium slab. 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 general, 6 inch (150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. stream Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. <> However, each also has unique requirements in terms of its structural design and detailing. thick or less); and Flatness tolerance: FF or gap under straightedge, depending on the floor profile class. However, the OP was concerned about the design of the podium slab. unless deflections are calculated Country 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. 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. When a concrete slab is stressed by the post-tensioning method, it means the 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 Calculate design shear strength of the slab, equation 3. The ACI Code permits thinner slabs to be used if calculated deflection is within the specified deflection limitations. 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. Similar to the one-way slab, the thickness of two-way slab should satisfy deflection and shear requirements. after about one year we see lot of cracks in all directions. ends continuous; and L/10 for cantilevers; where L is the span. 1 0 obj requirements is not frequent. The ACI Code sets limitations on slab thickness Mrs. Chillal June 30, 2019 Reply. Lastly, slab thicknesses are usually rounded off to the nearest 10mm. (for slabs 12 in. Long Spans The composite properties of the system have been compromised because the total thickness is 9.25” instead of 10”. 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Use a drop panel to thicken the slab adjacent to the column. 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. how to prevent. Measure for elevation and double check the base to insure uniform slab thickness. 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. What does typically change with height is the reinforcement within the columns. 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. ... at least the depth below slab. Get in Touch. %PDF-1.4 %���� Nationwide, there has been an increase in the demand for multi-story mixed-use and multi-residential structures. However, these requirements shall be checked in This type of construction is also referred to as an uppermost “structural slab” or “transfer slab” (both can have a slab … Estimate the deflection of the slab panel identified in part b of the figure under the follwoing conditions. 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). 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 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. Multi-story mixed-use and multi-residential projects are usually configured in one of three ways: 1. 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. >> Which instrument is widely used for surveying? Methods used for finding slab thickness varies for different types of slabs. Otherwise, thickness of one-way slabs must be at least L/20 for simply How to Design Continuous Beam and One-way Slab using ACI Approximate Analysis Method? this criterion the fire rating of a floor is the number of hours necessary for 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.

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