Coffered slab decorative coffered slabs in historical structures a series of these sunken panels were used as decoration for a. Gilded coffering on a barrel vault of the apsis in nazare, portugal giuliano da sangallos flat caisson ceiling, basilica di santa maria maggiore, rome decorative coffered slabs in historical structures coffering on the arch of septimius severus, rome a series of these sunken panels were used as decoration for a ceiling or a vault, also called. Decorative grid slabs in historical structures contd. Here is a detailed article with all the information regarding procedure of rcc slab roof laying. Features of the waffle slab the features of the waffle slab are as follows. Discover classes, experts, and inspiration to bring your ideas to life. Coffered slabs as a perspective type of the reinforced concrete structures. A study on a twoway posttensioned concrete waffle slab. Twoway joist concrete slab floor waffle slab system. These exposed precast ceilings provide an attractive architectural look to the interior of the building and are typically used for offices, airports, libraries and other high specification buildings.
Department of mechanics, materials and structures english courses reinforced concrete structures code. The best tilton box beam coffered ceiling free download pdf and video. Twoway joist waffle slab design approach and methodology. Department of mechanics, materials and structures english. The lateral loads are independently resisted by shear walls. Creagh concrete manufactures high quality precast concrete coffer ceiling units. The advantage of a coffered slab compared to traditional reinforced concrete. Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code. Late 16th century coffered ceiling of santa maria in aracoeli, rome coffering on the ceiling of the pantheon, rome 9. Waffle slab dwg full project for autocad designs cad. Although the crosssection is more complex when compared to a solid slab or coffer slab, flexural design poses no significant problem. The minimum slab thickness allowed for joist slabs is onetwelfth the clear rib spacing or 1.
One way spanning slabs two way spanning slabs on linear. Ribbing beams reinforcement, slab top wire mesh, waffles dimensioning, voids width and depth, slab thickness. They are used on flat sites they are wholly above ground no beam excavation is required no controlled or rolled fill is used cardboard slab panelvoid formers are used slab panels are on 1 metre grids approximately trench mesh or individual bars can be used slab thickness is 85 100. Please check out the similar products section for alternatives. They provide a very good form of construction where slab vibration is an issue, such as laboratories and hospitals. In flat slabs the total load intensity should be carried in both perpendicular directions. Perfectly poised to rise 41 storeys at the corner of bay and scollard in yorkville, the 112 exclusive residences at 50 scollard will capture the imagination and fulfill the unique demands of torontos most discerning clientele. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318.
Full slab is the younger brother of original full sans, full neue and full tools. Beside this, due to shear problems at column heads, the thickness of flat slab is greater. Full slab font free by bulent yuksel font squirrel. Dec 01, 2016 features of the grid slab they are used on flat sites. Nov 01, 2016 coffers were used in historical buildings even before rcc structures came into being. The crosssection of a cobiax slab has top and bottom flanges which accommodates compressive stresses for either sagging or hogging bending. Precast was chosen for its energy efficiency the concrete mass provides thermal energy storage and to keep the overall height of the building as low as possible. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Coffered system is quite suitable for medium size floors. They provide a very good form where slab vibration is an issue, such as laboratories and hospitals. Tips for laying rcc slab roof on 12092014 9091 views 3 comments rcc slab laying is one of major step in any type of construction so it is mandatory to know all the points related to laying rcc slab.
The first floor of the twostorey office building consists of a series of coffered precast concrete slabs supported on precast columns. Now here i need to clarify that this article will not treat waffle slab foundation which is another building element used in high cyclonic and windy areas but that is out of the scope of this article. Our plans taken from past issues of our magazine include detailed instructions cut lists and illustrations everything you need to help you build your next project step by step free download pdf teds woodworking plans free woodworking advice daily at the woodcraft of austin. The load per unit area on the slab becomes the load per unit length on the slab strip. Slab shear strength twoway shear check the adequacy of slab thickness for punching shear twoway shear at an interior column figure 4. A series of these sunken panels was often used as decoration for a ceiling or a vault, also called caissons boxes, or lacunaria spaces, openings, so that a coffered ceiling can be called a lacunar ceiling. This calculator will estimate the require concrete volume to fill the width, height and depth given. Then rcc waffle slabs were built which resembled coffers and hence it is also called coffer slab. A series of these sunken panels was often used as decoration for a ceiling or a vault, also called caissons boxes, or lacunaria spaces, openings, so that a coffered ceiling can be called a. A suspended ceiling is not needed as services are contained in the suspended floor above the slab. We would be restricting ourselves to understand the waffle slab used as roof. Reinforced concrete 2012 lecture 104 definition of column strips a and middle strips b the. A waffle slab or twoway joist slab is a concrete slab made of reinforced concrete with concrete ribs running in two directions on its underside. Coffered vaulted slabs by creagh concrete products ltd.
The downsides of waffle slabs and cupolex slabs are the same its a slab constructed on top of the ground and its easy for water to get under the slab. Manual for the design of reinforced concrete building. The new formscaff coffers can support a slab thickness of 0. Analysis of flat sanalysis of flat sllabab moment division example 6000 6000 6000 6000 6000 5000 layout of building 7000 5000 a floor slab in a building where stability is provided by shear walls. You have asked this question because waffle slab is not that common throughout the world. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Depending on the application, the ribs will be either precast concrete lattice ribs or wooden purlins. The institution of structural engineers the institution of civil engineers march 2000 manual for the design of reinforced concrete building structures to ec2. A coffer or coffering in architecture is a series of sunken panels in the shape of a square, rectangle, or octagon in a ceiling, soffit or vault.
Flat slab analysis and design free version download for pc. A suspended ceiling is not needed as services are contained in the suspended floor above the. Pdf design aids for precast ordinary reinforced and. Scribd is the worlds largest social reading and publishing site. Coffered slab decorative coffered slabs in historical structures a series of these sunken panels were used as decoration for a ceiling or a vault, also called caissons boxes, or. Ideally suited for advertising and packaging, editorial and publishing, logo, branding and creative industries, poster and billboards, small text, wayfinding and signage as well as web and screen design. Cascadia model generated by a different methodology than other slab1. Flat slabs 753 coffered slabs 754 shear reinforcement for.
Flat slabs may have drop panels at columns and columns may have capitals. Pdf coffered slabs as a perspective type of the reinforced. Coffered slab decorative coffered slabs in historical structures a series of these sunken panels were used as decoration for a ceiling or a vault, also called caissons. Simply input the data required within the appropriate box and select update button located of the bottom. Ribbed and waffle slabs provide a lighter and stiffer slab than an equivalent flat slab, reducing the extent of foundations. The kwikstrip system produces a coffer grid spacing of 0. Flat slab analysis, design and detailing pdf civil engineering. Waffle slabs are preferred for spans greater than 40 feet 12 m, as they are much stronger than flat slabs, flat slabs. Prestressed concrete analysis and design fundamentals. One way spanning slabs two way spanning slabs on linear supports coffered slabs from structural 1 at indian institute of technology, roorkee. I have used the word flat slab and by that i mean the slab that has leveled surface from both top and soffit. Coffered slabs as a perspective type of the reinforced. The name waffle comes from the grid pattern created by the reinforcing ribs.
Best shallow coffered ceiling ideas free download diy pdf. The other issue for these slabs in cyclonic regions is the lack of concrete under the big truss reactions. Coffered slabs provide a lighter and stiffer slab than an equivalent flat slab, reducing the extend of foundations. Its not like a flat slab which is here and there i. The flexibility of flat slab construction can lead to high economy and yet allow the architect great freedom of form. Reinforcement detailing manual section 7 april 06 73 7. Bearing capacity analysis of a coffered slab of the existing building of. In waffle slabs a drop panel is automatically invoked to guarantee adequate twoway punching shear resistance at column supports. Design of waffle slab without beams by direct design method.
Ribbed slabs are made up of wide band beams running between columns with narrow ribs spanning the. Castinplace and precast ways of construction of coffered slab are. The system is designed for heavy loads uniformly distributed superimposed analysis of waffle slab. Flat slab system is an important division of concrete floor system. The williams coffer slab system consists of removable plastic coffer blocks suspended between a series of parallel ribs spanned across the area where a concrete slab is required.
In this paper considered the technology of arrangement of this slabs. The analysis and design follow the equivalent frame analysis method of the aci code, which considers a onebay wide strip of the floor system as a continuous frame. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. Design of waffle slab without beams by direct design method 32 32 32 c 1 c 2 c 3 c 4 2 c 5 c 6 c 7 c 8 32 s ss 22 3 7 c 9 c 10 c 11 c 12 32 8 11 b 1210 bb c.
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