Vakhnenko, calculation and design of parts of residential and public. Detail is a plan view of a ribbed waffle slab that can be used as an example for other projects. Different types of shear reinforcement used at column heads. Following are the rcc slab design and detailing guidelines.
Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is following are the rcc slab design and detailing guidelines. Find the following parameters for design moments in step 2 per unit width step 4 note. Keep up to date with landscaping architecture design ideas for home, commercial and. Here is a detailed article with all the information regarding procedure of rcc slab roof laying. Coffered ceilings do not look cheap and thats because they arent. The waffle slab is also sometimes termed as ribbed slab system but you would find it interesting to know that ribbed and waffle slab are somehow two different things. The first floor of the twostorey office building consists of a series of coffered precast concrete slabs supported on precast columns. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems.
Manual for the design of concrete and reinforced concrete structures of heavy. Punching of flat slabs design for shear at th e column heads 12. Nov 01, 2016 coffers were used in historical buildings even before rcc structures came into being. Build out the bonus room over the garage and you can get an extra bedroom or a room to suit your needs. In this paper, the optimum design of reinforced concrete waffle slabs is so ught using the simple genetic algorithm. Coffered slabs as a perspective type of the reinforced concrete. Ribbed floors consisting of equally spaced ribs are usually supported directly by columns. 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. Holedeck waffle slab construction system saves per floor. Reinforced concrete sk 33 section through slab showing stress due to moment. Frp reinforced concrete slabs a comparative design study. Flat slab system is an important division of concrete floor system. Are you interested in having a custom home plan designed just for you. However, when considering design for shear, the spherical void formers used in the cobiax system result in concrete web widths that not only change through the depth of the section, but also in a horizontal direction.
A civil engineer must know all the aspects regarding the flat floor system. The advantage of a coffered slab compared to traditional reinforced concrete slab is a possibility of bridging large spans. Feasibility of structural design of members has been ensured under the provision of is. Analysis and design of waff le slab with different boundary. Mar, 2017 how to form, pour, and stamp a concrete patio slab duration. These materials are originally located at different websites. The new formscaff coffers can support a slab thickness of 0. Coffered slab is a ribbed structure with re inforced ribs in the lower zone. Some of them are outdated and many of them are frequently used everywhere. A coffer ceiling may or may not be plane slab for example the c. Coffers were used in historical buildings even before rcc structures came into being. Mar 01, 2018 the waffle slab system can be called as a two way joist slab system which comprises of ribs constructed in perpendicular direction.
Design of slab for flexure 067 m unit width of slab. Waffle slab analysis and design is similar to the procedure used with flat plates except that special considerations need. Coffered vaulted slabs by creagh concrete products ltd. The name waffle comes from the grid pattern created by the reinforcing ribs. This waffled feature in slabs will help to take up heavy loads. Creagh concrete products ltd hasnt formatted technical specifications for coffered vaulted slabs yet. The design of composite slabs and beams is discussed in detail in relation to the eurocodes and bs 5950.
Late 16th century coffered ceiling of santa maria in aracoeli, rome coffering on the ceiling of the pantheon, rome 9. Waffle slab is a reinforced concrete roof or floor containing square grids with deep sides. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is 456. It depe nds of methods of design of such structures. For the purposes of this study, coffer slabs refer to slabs designed. F is the total design ultimate load on the strip of slab between adjacent columns considered 1. During this chapter the basic design principles of each type of slab will be explained. Department of mechanics, materials and structures english courses. Design of waffle slab without beams by direct design method. A waffle slab can be made in different ways but generic forms are needed to give the waffle shape to the slab.
A2slab thickness design by wri method a3design examples using coe charts a4slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. Flat slab analysis, design and detailing pdf civil. 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. The institution of structural engineers the institution of civil engineers march 2000 manual for the design of reinforced concrete building structures to ec2. Flat slab analysis, design and detailing pdf civil engineering. 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. Step into your dream home every day with this home plan. Manual for the design of reinforced concrete building.
Elegant coffered ceiling 59822nd architectural designs. Coffered slab free download as powerpoint presentation. There are 16 different types of slabs in construction. This house plan offers 50 square feet of living area, four bedrooms and five full bathrooms. Flat slab analysis and design pdf flat slab design pdf 1. Sound transmission class guidance introduction the noise guidebook, pages 3337, provides an elementary discussion of stc, provides some stc ratings for common building materials and limited exterior and interior wall construction configurations, and describes a method to determine composite stc value of a wall containing a window or door. 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. This form of construction is not very common because of the formwork costs and the low fire rating. Coffered slab beam structure precast concrete scribd. The waffle slab has been considered as monolithically connected to band beams. Design the concrete floor slab system shown below for an. Please check out the similar products section for alternatives. They are either oneway spanning systems known as ribbed slab or a twoway ribbed system known as a waffle slab. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place.
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 c 14 c 15 c 16 16. 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. It depends of methods of design of such structures. Accents of metal roofing and decorative shutters add to the curb appeal. This paper deals with the problem of optimum design of reinforced concrete twoway ribbed waffle slabs using genetic algorithms. Ribbing beams reinforcement, slab top wire mesh, waffles dimensioning, voids width and depth, slab thickness. The recommendations derived from these and other studies vary from extremely light to extremely heavy. In this article, ill give a detailed explanation of each slab where to. 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. A coffered ceiling is a group of sunken panels of various shapes in a ceiling. Design of waffle slab without beams by direct design method 32 32 32 c 1 c 2 c 3 c 4 2 c. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3.
Twoway joist concrete slab floor waffle slab system. How to form, pour, and stamp a concrete patio slab duration. Twoway joist waffle slab design approach and methodology. The design of the different slab forms is assessed according to these codes, and results compared with the behaviour. Decorative grid slabs in historical structures contd. Wave to the neighbors as you relax on the huge covered front porch.
Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. In modern times, coffered ceiling often refers to a custom wooden frame over ceiling panels to create the look of the historical design. The waffle slab system can be called as a two way joist slab system which comprises of ribs constructed in perpendicular direction. Department of mechanics, materials and structures english.
Reinforced concrete slab design guidelines a effective span of slab. Depending on the application, the ribs will be either precast concrete lattice ribs or wooden purlins. Slab gilded coffering on a barrel vault of the apsis in nazar, 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. Dating back to when they were made of stone, a coffered ceiling was considered an architectural feat of construction. First designs to follow the brab report required foun.
This new system they invented is called the holedeck. Waffle slab plan view reinforcement detail waffles. Columns usher your guests into the great room with fireplace and elegant coffered ceiling. The reinforced concrete waffle slab ribbed slab plan view includes main top longitudinal and transverse reinforcement, ribbing beams reinforcement, waffles dimensioning, voids width. Waffle slabs are most suitable for construction of slabs with long span. It was actually the widespread use of the posttensioned slabonground which induced this interest in design procedure and in many studies of reported slab failures. Waffle slabs are preferred for spans greater than 40 feet 12 m, as they are much stronger than flat slabs, flat slabs with drop panels, twoway slabs, oneway slabs, and. Enjoy a good book in the study located at the front of this home plan. Analysis and design of waff le slab with different. A civil engineer should study these lectures and materials for structural engineering acumen. Then rcc waffle slabs were built which resembled coffers and hence it is also called coffer slab.
Coffered ceilings crown the great room of this attractive ranch home plan. Actually the introduction of support hoists made waffle slab very stiff. Waffle slabs are most suitable for construction of slabs. The kwikstrip system produces a coffer grid spacing of 0. Reinforced concrete slab design and detailing guide is456. When one says ribbed slab it is actually a one way spanning system with ribs where as in waffle slab the joists form a two way system. Twoway joist waffle slab design approach and methodology twoway joist slab often called twoway ribbed slab or waffle slab is an economical floor system when the spans are long andor loads are high. A suspended ceiling is not needed as services are contained in the suspended floor above the. However, they pay back greatly in aesthetic appeal and resale value since they add a touch of luxury to any plain room. This paper represents that in the commercial building for the architectural consultant to design and shape by the coffer slab with different types of moulds used as.
In this paper considered the technology of arrangement of this slabs. Department of mechanics, materials and structures english courses reinforced concrete structures code. Inside, a wonderful open floor plan enhances the views and makes the home seem huge. Slabs that have span greater than 16m can make use of a waffle slab design. Singh when a large space within a building needs to. All three of the secondary bedrooms are nestled together in this design with the private master suite on the. Mike day everything about concrete recommended for you. Decorative grid slabs in historical structures apsis in nazare, portugal tomb of galileo, vatican city arch of septimius severus, rome 8. 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. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. 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. A computer program is written using matlab to formulate the problem and perform the structural analysis and design of those slabs by the direct design method. In addition to general ultimate and serviceability limit state design issues, practical design considerations such as the formation of holes in the slab, support details, fire protection, and attachments to the slab are discussed.
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