Different between solid slab and ribbed hollow slab uae. In waffle slabs a drop panel is automatically invoked to guarantee adequate twoway punching shear resistance at column supports. My graduation project with my mate ghassan faris, a two way ribbed slab of clear span of 18 x 25 m was designed by safe 2014, the building is 3storey concrete. Soil and ribbed concr ete slab interface modeling using large shear box and 3d fem samples were tested under the vertical load of 100 kpa, 150 kpa and 200 kpa at the rate of 2 mmmin to a maximum.
Service downloads latest release updates sentinel driver 7. Middle axis of the rib and the slab are coincident. Its the modelling of ribbed slabs based on approach of artur. Having been actively involved in the design of waffle slabs or ribraft slabs. Manual for the design of concrete building structures to. For the purposes of analysis and design, the program replaces the ribbed slab with solid slabs of equivalent moment of inertia, weight, punching shear capacity, and oneway shear capacity. Ms surface rt tablet and pdf file printer i am interested in to purchasing a windows 8 surface rt tablet realising that no 3rd party apps can be installed. The equivalent thickness based on system weight is used to compute the system selfweight. Their function is the same as any slab, to support loads coming from the roof and ultimately to the ground and to also act as a floor. Till now i dont know how to export a panel design to dxf with the panel thickness shown and the reinforcement also shown on cross section of panel. Hollowcore slabs have excellent span capabilities, achieving a capacity of 2. Twoway joist concrete slab floor waffle slab system. In general, it is seen that in solid slab a portion of concrete below the neutral axis remains ineffective.
Pdf comparison between ribbed slab structure using. The thickness of slab and depth of rib of waffle slab can be then computed by equalizing the moment of. As the number of automaker recalls due to software issues are increasing and gaining widespread attention, we are striving to enable the automotive industry with the bestinclass software and guidelines to control and improve the architecture and technical quality of embedded software for the industry. Pdfill free pdf and image writer free download and software. Cost optimization of reinforced concrete oneway ribbed slabs. The rib reinforcement follows the same rules with the beam reinforcement.
The load transfer mechanism between the reinforced. These materials are originally located at different websites. As simple as i can answer, a rib slab or ribbed slab is similar to flat slabs. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Ribbed slab floors are very adaptable for accommodating a range of service openings. Civilax is the knowledge base covering all disciplines in civil engineering. The two foot wide steel panels were supported with a 6 in wide by 6 in deep concrete beam. Pdfill free pdf and image writer free download and. When required to contribute to the structural strength of a slab, slabs should be made of. Check the applicable joist dimensional limitations as follows. However, subsequent dbh guidelines for such are in the writers opinion over. Aug 09, 2016 ribbed and waffle slabs provide a lighter and stiffer slab than an equivalent flat slab, reducing the extent of foundations. A slightly deeper section is required but these stiffer floors facilitate longer spans and provision of holes. The printer could be a local printer, which is connected to your computer.
How to design concrete structures using eurocode 2. You created this pdf from an application that is not licensed to print to novapdf printer. Jan, 2017 advantages of rib clay pot slab over solid concrete slab published on january, 2017 january, 2017 26 likes 2 comments. Ribbed slab article about ribbed slab by the free dictionary. Flat slab analysis, design and detailing pdf civil engineering. Structural ribbed concrete slabs the cupolex floor slab can be fully or partially suspended on piles, stem walls or gradeedge beams. The adc suite comprises column, beam, one way solid slab and ribbed slab design and check options. Ribbed slab or zoellner slab ribbed slab reinforcement details. In general, it is seen that in solid slab a portion of concrete below the. However, mainly as far as the stirrups are concerned, the amount of placed rebars is not as large as it is in beams. Pdfill pdf editor is an amazing free pdf editing solution. Pdf soil and ribbed concrete slab interface modeling using.
Pdf this paper presents an historical and analytical evaluation of the ribbed floor slab systems developed by the italian structural artist pier. The thickness of equivalent flat slab is taken from table 9. Ribbed slabs have been widely used in buildings due to their many advantages, especially the decrease of concrete below the neutral line. In this study, the aci direct design method is used as a manual or hand method of calculation and the solution will be compared with the analysis results of the three dimensional structural model done by the computer program sap2000. However no research had been made to aid the understanding of the load transfer mechanism between the reinforced concrete ribbed. Deflection of two way slab could be calculated by using available methods to make sure that the deflection will not. The reinforced concrete waffle slab ribbed slab cross section reinforcement detail includes ribbing beams reinforcement, slab top wire mesh, waffles dimensioning, voids width and depth, slab thickness. Jul 22, 2015 my graduation project with my mate ghassan faris, a two way ribbed slab of clear span of 18 x 25 m was designed by safe 2014, the building is 3storey concrete.
Mathematical structural analysis of one way ribbed slabs was introduced in this paper. Chapter 7, originally published as flat slabs4 covers the design of flat slabs. A civil engineer must know all the aspects regarding the flat floor system. The slab column structure began to emerge in the structural design since early nineteen century. By dave etchells, the imaging resource tuesday, february 17, 2004 18. Ribbed slabs ribbed slabs mat slabs california slabs 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. My approach is to model a rectangular beam web with no offset but with artificially increased moment of inertia see theattached picture iy of rectangular beam multiplied by ratio of iy of t shape beam iy of rectangular beam. Ribbed and waffle slabs provide a lighter and stiffer slab than an equivalent flat slab, reducing the extent of foundations. Comparison between ribbed slab structure using lightweight foam concrete and solid slab structure using normal concrete. The picture on the left is the bottom side of the slab and the picture on the right is a screenshot of the 1. Flat slab analysis, design and detailing pdf civil. Pdf analysis of two way ribbed and waffle slabs with. This 300 mm deep ribbed slab is required for an office to support a variable action of 5 kn m2 it is supported on wide beams that are the same depth as the slab, as shown in figure 3.
Twoway joist waffle slab design approach and methodology. Pdf the ribbed floor slab systems of pier luigi nervi researchgate. In general, the beamslab flexural stiffness ratio is about 0. Within a few minutes i was able to convert the scanned pdf document into a. Dec 06, 2017 basic of ribbed slab with aci 31802 code requirements. The ribbed slab was analyzed exactly by finite element theory through sap 2000 program. Students will look at, analyze and critique project examples that demonstrate styles and techniques they will use on their own project. While the isostatic inspiration for the rib patterns of nervis floor systems is well. Minimum thickness for two way slab construction designed as per methods provided by aci 31811 code namely, direct design method and equivalent frame method. Additional reinforced internal ribs are then used in the slab by introducing pontex, the structural cupolex accessory to provide a structure capable of spanning between foundations or piles.
Jul 02, 20 introduction hollow block and ribbed slabs are formed by placing blocks on the slab and concrete ribs. Reinforced concrete ribbed slabs with widebeam lajes. Ribbed slab design spreadsheet civil engineering community. Oct 19, 2011 cost optimization of a reinforced concrete oneway joist floor system consisting of a hollow slab is presented in this paper. In this article, the author presents a parallel approach to the traditional teaching method of twoway ribbed slabs. Advantages of rib clay pot slab over solid concrete slab. For joist depth determination, waffle slabs are considered as flat slab aci. Ribbed or waffle slab is a slab system which consists of series of parallel reinforced concrete t beams framing into reinforced concrete girders. Aug 15, 2016 download code ribbed slab design spreadsheet. The two foot wide steel panels were supported with a.
Continuous ribbed slabs concrete structures eurocode. Ribbed slabs oneway joists introducing voids to the soffit of a slab reduces dead weight and increases the efficiency of the concrete section. Units are installed with or without a structural screed, depending on requirements. Pdf soil and ribbed concrete slab interface modeling.
The slab is the flange of the beam and the extended part is the web. Ms surface rt tablet and pdf file printer microsoft. Advantages of rib clay pot slab over solid concrete slab published on january, 2017 january, 2017 26 likes 2 comments. The cupolex floor slab can be fully or partially suspended. The eccentricity is calculated automatically as the sum of the half of slab thickness and the distance from the top slab face to the centroid of the crosssection. Since then extensive research had been made to understand the punching behaviour of flat slab column structure. One way ribbed slab as a model is analyzed by the two methods traditional and the finite element method. The historical discussion includes the evolution of the floor slab from a nonstructural element to an inspired structural system, culminating in nervis patented ribbed floor systems. Ribbed slab floors are most economical for buildings such as hospitals, schools, hotels, and. Analysis of two way ribbed and waffle slabs with hidden beams article pdf available in international journal for computational civil and structural engineering volume 4, no 3, 2014 january. In case of hollow block slab voided blocks are placed to reduce the total weight of the slab.
The blocks are considered as nonstructural element as they do not contribute to strength of. Analysis of two way ribbed and waffle slabs with hidden. 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 and waffle slabs they provide a very good form of construction where slab vibration is an issue, such as laboratories and hospitals. They provide a very good form of construction where slab vibration is an issue, such as laboratories and hospitals. The slab was 610m simply supported on four sides and subjected to uniform load 1tm 2 and as shown in fig. Cost optimization of a reinforced concrete oneway joist floor system consisting of a hollow slab is presented in this paper. Under the general provisions of the 1995 code, chapter, the twoway joist portion may be combined with a solid column head or with solid wide beam sections on the column centerlines for uniform depth construction.
Minimum thickness of two way slab as per aci 31811 for. Between the ribs, the slab is usually reinforced with a common wire mesh. Sep 10, 2017 pdfill pdf editor is an amazing free pdf editing solution. In general, the beam slab flexural stiffness ratio is about 0. Analysis of two way ribbed and waffle slabs with hidden beams. The load transfer mechanism between the reinforced concrete.
Cost optimization of reinforced concrete oneway ribbed. Optimization of flexural prediction for ribbed floors in. Beton of the daliform group, truncatedpyramid in shape with a crossed, semicylindrical notch at the top to house the reinforcement bars or the systems to be integrated in the casting. In case of ribbed slab the blocks are not permanent. Slab box architectural style objectives students will utilize the art department website as a main resource for the project. Applicable to cold and hot formed reinforcing steel plain or ribbed. Flat slab system is an important division of concrete floor system. The manual design procedure can be divided into a number of stages where the user.
Introduction hollow block and ribbed slabs are formed by placing blocks on the slab and concrete ribs. Neither this manual nor any part of it may be reproduced, edited, or altered by any means. Ribbed slabs my suggestions to model one way ribs slabs you can use beam systems to define ribs and floor to define topping slab for hollow block you can great a new family as structural framing or generic model and mind that self weight for this material. Teaching twoway ribbed slab analysis and design using the. In sap program, the model has been divided to frame elements to represent ribs and beams and shell elements to represent the slab and solid part. This function is minimized, subject to design constraints, using the harmony search algorithm. The minimum slab thickness allowed for joist slabs is onetwelfth the clear rib spacing or 1. The minimum thickness of slab is specified by aci 31811, section 9.
Ribbed slabs are made up of wide band beams running between columns with narrow ribs spanning the orthogonal direction. The longspan capability is ideal for offices, retail or car park developments. The saving of materials tends to be offset by some. Analysis of two way ribbed and waffle slabs with hidden beams ibrahim mohammad arman international journal of civil and structural engineering volume 4 issue 3 2014 345 length and l2 is the transverse distance or frame width. 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.
Recently we came across a rather rare concrete slab in a very old hospital. The model provides the actual behavior for ribbed slab by analyzing the structure as oneunite in two dimensions. Teaching twoway ribbed slab analysis and design using the mathcad program mohammed s. Slabs are usually used in floor and roof construction. The results of this analysis are compared with the results of the finite element method by sap program. Ribbed slab a panel composed of a thin slab reinforced by ribs in one or two directions, usually at right angles to one an other. The cost of the system is considered to be the objective function, and the design is based on the american concrete institutes aci 31805 standard.
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