Ribbed slab design software

Suspended slabs can include flat, twoway, waffle, and ribbed framing systems. They provide a very good form where slab vibration is an issue, such as laboratories and hospitals. We aim to close the gap to the industry by improving the awareness about latest trends in civil engineering. Jun 06, 2019 like flat slabs, ribbed slabs can be posttensioned. Course content this spreadsheet program provides for the design and analysis of posttensioned concrete oneway beam and slab systems and twoway flat plate slab systems. How to design ribbed slab with autodesk robot structural. This form of construction is not very common because of the formwork costs and the low fire rating. Ribbed slabs are made up of wide band beams running between columns with narrow ribs spanning the. Analysis of two way ribbed and waffle slabs with hidden beams. The girders on the raft may be either down or up the slab. They are either oneway spanning systems known as ribbed slab or a twoway ribbed system known as a waffle slab.

This way, you can work depending on project and status, as required by your personal workflow. Using these entries, it is possible to design the rib as a downstand or upstand beam with effective slab widths in rfconcrete members. There are various established methods for analysing ribbed slabs and dealing with the solid areas. The columns are used to provide support to the directly. Project specific slab designs are created using an optimised combination of prestressed. Jun 27, 2017 ram concept offers an easier way of modeling waffle slabs in my opinion, but even then the design can be rather tedious. The type of slab presented in this paper is a coffered precast one.

You can use a combination of slab and beam elements, but by default those will be centered vertically which isnt quite right analytically speaking and dealing with offsets can get complicated. Reinforced concrete slab and beam design software adaptrc. Using udls simplifies the analysis and remains popular. They provide a very good form where slab vibration is. In ribbed slab, there is oneway spanning and in a waffle slab, there is twoway ribbed system. Join us for this webinar on designing structural castinplace slabs in tekla structural designer. There are two main types of ribbed floors a hollow block floors and b moulded floors as shown in figure 8. Modelling ribbed slab if you just want it to look right, create a new profile. A ribbed slab with total thickness of 300 mm may have a selfweight equal to 3.

Like flat slabs, ribbed slabs can be posttensioned. The domeshaped forms create a matrix of voids surrounded by orthogonal ribbing, producing a twoway configuration very suitable for largespanning slabs. Ribbed slab design spreadsheets to eurocode 2 en 19921. Twoway joist waffle slab design approach and methodology. Ribbed slabs waffle slabs zoellner, sandwich can be used for large spans, like the one shown in the figure. Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1. Hello bd, could you please design a flat slab with detailed reinforcement using prota structures. Protastructure professional structural engineering software duration. Civilax is the knowledge base covering all disciplines in civil engineering.

The design procedure includes determini ng slab thickness based on moving live loads and then checking adequacy of slab thickness for stationary live load. Concrete floor slabs on grade are subjected to a varie ty of loads and loading conditions. This is a part of his project economic design of two way rcc slabs under prof s. In waffle slab design where the drop panels create a large critical shear perimeter, the factor b o d has limited contribution and is traditionally neglected for simplicity and conservatism. A study on a twoway posttensioned concrete waffle slab.

Rtslab simple building construction slab rib software. See more ideas about waffle ceiling, architecture and ceiling design. The load on this slab is carried by the short span in a direction but the main reinforced bar and distribution bar in transverse direction. For the purposes of analysis and design, the ribbed slab will be replaced with a solid slab of equivalent moment of inertia, weight, punching shear capacity, and oneway shear capacity. The design procedure separately incl udes determining thickness of slab under wall load. This gives you complete waffle slab design with rebar detailing and schedules. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. The sheet is designed for all nine types of panels and gives details about middle strip as well as edge strip reinforcements in the rcc slab. Ribbed slabs are made up of wide band beams running between columns with narrow ribs. The depth of the slab in compression, for full shear. Normally the ribs and the beams are the same depth. On the technical drawings, reinforced concrete slabs are often abbreviated to r. The continous slab will be designed as a series of simply supported spans.

Project specific slab designs are created using an optimised combination of prestressed slab beams in conjunction with our infill options. The ratio of the total costs was found to be within the range 1. In reality, sandwich slabs are ribbed slabs with a slab placed both to their upper and lower surface. The new version of the fem structural slab design software includes adaptations to european standards, e. Ribbed and waffle slabs provide a lighter and stiffer slab than an equivalent flat slab, reducing the. The slab is the flange of the beam and the extended part is the web. Design spreadsheets in high rise buildings and skyscrapers, thinner, precast concrete slabs are slung between the steel frames to form the floors and ceilings on each level.

Slabs is a program that can be used by structural engineers to perform a static analysis and design of reinforced concrete slab systems of any shape, including suspended slabs and slabsonground. Ribbed slab design in sap2000 civil engineering downloads. In this video you will learn how to analyze and design different slab types plate and ribbed slabs prota software. Ribbed slab in design in safe civil engineering community. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. To easily select slabs, click on the dimension tag titled 1s2 as seen below for the main reinforcement bars. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Slabs are usually used in floor and roof construction. Ribbed slab design spreadsheet civil engineering downloads. Visual interest ribbed slabs are being used by architects to give visual interest when exposing the slab soffit. Posttensioning may be included in both slabs and beams to balance a percentage of the selfweight. Ribbed and waffle slabs provide a lighter and stiffer slab than an equivalent flat slab, reducing the extend of foundations. Ribbed slab design spreadsheet civil engineering community.

Ram concept offers an easier way of modeling waffle slabs in my opinion, but even then the design can be rather tedious i suspect that a lot people simplify the problem. Twoway joist concrete slab floor waffle slab system. The plain view of this slab has a square shape, having the length of 2800mm, as presented in fig. One method is to ignore the weight of the solid part of the slab in the analysis of the ribbed slab and the weight of the solid area added to the supporting beam. When a slab is supported on all four sides and the proportion of the long span to the short span is less than 2. Slabs or foundations can be of any shape, and can include edges shaped with circular and spline curves. Pdf comparison between ribbed slab structure using. In this example, the latter option will be used to achieve better understanding for the design of twoway joist slab often called twoway ribbed slab or waffle slab. Waffle slabs tend to be deeper than the equivalent ribbed slab. The ribbed slab ubc 1816 or pti design method was developed by the posttensioning institute from an earlier effort made by the prestressed concrete institute that had been based on research by the building research advisory board of the national academy of sciences in the 1950s.

Two way rcc slab designing tool in microsoft excel developed by shankar tayal a 3rd year student of school of infrastructure, indian institute of technology, bhubaneswar this is a part of his project economic design of two way rcc slabs under prof s. Reinforced concrete slab and beam design software adaptrc 2017 product overview an easytouse and learn software for the design, analysis, and investigation of reinforced nonprestressed concrete beams, beam frames, slabs and floor systems a must have production tool in every structural engineering office. Comparison between ribbed slab structure using lightweight foam concrete and solid slab structure using normal concrete. How to design ribbed slab with autodesk robot structural analysis but, if you use light beamsor supports at the part of the nervedrib structure of the slab can it work, i mean using separate objects, one for the ribs and another thin slab to. Civilax on beam design with excel using coefficient method. Design of two way ribbed slab 18 x 25 m clear span 1. The ribs are categorized as ribbed slab and waffle slab. Integrated reinforced and posttensioned concrete slab design software adaptfloor pro product overview with its ability to model full multistory concrete buildings, floor pro delivers value beyond other singlelevel slab design programs. Slabs are actually structural members made for floors and roofs in buildings which may be formed of solid thickness or ribbed with ribs running in one or two directions. Aug 15, 2016 download code ribbed slab design spreadsheet. For general design philosophy and analysis of posttensioned concrete, the reader should refer to pdhonline course s127. Steelreinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving see below. They are either oneway spanning systems known as a ribbed slab or a twoway ribbed system known as a waffle slab. Ribbed slab design spreadsheet free download description.

Oct 28, 2017 design two way ribbed slab using sap 2000 2000 duration. 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. A slab is structural element whose thickness is small compared to its own length and width. They provide a very good form of construction where slab vibration is an issue, such as laboratories and hospitals.

Ribbed and waffle slabs provide a lighter and stiffer slab than an equivalent flat slab, reducing the extent of foundations. Check the applicable joist dimensional limitations as follows. Design of ribbed slab in etabs civil engineering community. Continuous ribbed slabs concrete structures eurocode.

Sandwich slabs may have the disadvantage of a larger weight compared to the ribbed ones but on the other hand, they have the advantage that their spans and supports behave in the same proper way. As a standalone program, it analyzes and designs individual floor levels one at a time. In this video you will learn how to analyze and design different sl. A slightly deeper section is required but these stiffer floors facilitate longer spans and provision of holes. Planbar combines the advantages of threedimensional models and excellent drawing preparation. Two way rcc slab designing excel sheet civil engineering. Ribbed slab design in sap2000 civil engineering community. Ribbed or waffle slab is a slab system which consists of series of parallel reinforced concrete t beams framing into reinforced concrete girders. Waffle slab design example structural engineering general. Ribbed slabs are made up of wide band beams running between columns with narrow ribs spanning the orthogonal direction. There must be full shear connection, so that the design compressive force in the concrete, nc,f is. Apr 27, 2014 civilax is the knowledge base covering all disciplines in civil engineering. The best book to refer to is reinforced concrete design to eurocode by bill mosley.

Ribbed slab systems we have an extensive range of precast, prestressed, slab systems which provide a fast, cost effective and simple solution for any suspended slab requirement. Ribbed rafts can be used for many structures when a flat level for the first floor is not required. This tool provides a excellent economic design of a rcc slab spanning in two directions under loading conditions provided by the user keeping in mind all design considerations prescribed in is 456. In many domestic and industrial buildings, a thick concrete slab supported on. You can perform reinforcement designs, long term deflections, beam designs, reactions, automatic two way action, effective moment of inertia, and punching shear. Models can have columns, braces, walls, and ramps connected from the floors. Well go over the steps for a successful design, introduce our unique patch method, compare and contrast to traditional strip methods and export the reinforcing drawing to a dxf. Concrete slab design software free download concrete. A ribbed raft consists of a stiffened slab by girders in x and ydirections. Ribbed slabs oneway joists introducing voids to the soffit of a slab reduces dead weight and increases the efficiency of the concrete section. Summary of bill of quantities civil works bar bending schedule. In this webinar well present the methodologies for slab design.

The structural modeling used in most commercially available software, where stems are considered as disjointed from the topping slab does not deliver the advantages associated with waffleslab slab construction. Reference 5 focused on analysis of twoway ribbed slabs with. Flat slab analysis and design free version download for pc. Design icon set is a collection of wonderfullycrafted stock icons for use in commercial and personal products, including software applications, websites and other graphics. They might assume an equivalent stiffness solid plate, or they might model the beams in both directions like a grid with no slab at all, or they might focus on a single strip. This will result in further material efficiency with the volume of concrete reducing by a further 10%, a total saving of 30% on a typical flat slab solution. Posttensioned concrete design spreadsheet program a pdh. Ribbed and waffle slabs types, advantages, disadvantages. Twoway ribbed slab system waffle system the system was designed to decrease the weight of traditional fullconcrete slabs. Planbar is the cad solution specifically for the precast concrete industry.

Reinforced concrete design examples geotec software. Two way rcc slab designing tool in microsoft excel developed by shankar tayal a 3rd year student of school of infrastructure, indian institute of technology, bhubaneswar. It has got detailed worked example of all cocncete elements, including ribbed and waffle slabs. The icons have a bright color palette, smooth and wellrounded edges. Ribbed slab floors are most economical for buildings such as hospitals, schools, hotels, and apartment construction where loads are somewhat small and the spans are relatively large. Ribbed floors consisting of equally spaced ribs are usually supported directly by columns.