Waffle slabs are a common type of hollowcore slab which use the same principle as voided biaxial slabs. All new bridge construction located above an elevation of 4,000 feet, or for areas where deicing chemicals are used, deck slabs, barriers, anchor slabs and approach slabs reinforcing as well as portions of reinforcement projecting into the deck slabs shall be epoxy coated. More recently, the idea of castinplace bubble voided slabs has become a popular choice for designers and architects looking to decrease slab thickness and overall structure weight. The prestressed concrete voided slab standards include slab widths of 30 and 40 and depths of 15, 18 and 21. As needs change, your building is better prepared to adapt. An introduction to bubblevoided concrete flat slabs. Reinforced concrete slabs are one of the most common components in modern building construction. This floor system allows for large, clear spans and efficient overall slab thicknesses. Miami art museum in miami, florida having an extent of. The idea of voided concrete slabs has been around for decades, and although designs may vary the premise behind them remains the same.
Slab supported on two sides and bending takes place predominantly in one direction only is called one way slab. Pci bridge manual appendix b, aashtopci standard products. Environmental monitoring report quarterly progress report no. This product innovation evolved due to the requirement of our customers to achieve greater structural spans whilst reducing the overall building mass and. Des is a comprehensive, multidisciplinary engineering organization committed to providing our clients with quality products and services in a timely manner. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. We are sure that you will quickly notice the many changes that have been made to the layout and data. Flat slab analysis, design and detailing pdf civil. Bridge drawings and details south carolina department of. A two way spanning voided biaxial slab construction with spheres according to the bubbledeck system, compared to older voided slab constructions quick and easy to implement. Reinforcement detailing of a slab is done based on its support conditions. The concept centers on removing concrete mass from the areas of the slab where it is not structurally efficient. Finite element modelling of voided slab bridge decks using.
Insitu voided slab design aci concrete design structural. Biaxial hollow slab with innovative types of voids a. Incorporating voids within a slab offers many advantages over a conventional solid concrete slab, for example a lower total cost of construction, reduced material use, and enhanced structural efficiency. Frequently asked questions about flat plate voided concrete. Uboot seminar report, ppt, pdf for civil engineering. There is an essential feature found in the wings of birds. The new bridge log book format and distribution we are pleased to announce the release of the 2002 inventory of bridges, state highway system of indiana. Flat slab system is an important division of concrete floor system. By using these drawings, you expressly consent to such terms. Pdf downloads free technical notes technical note etnb417 14 pp 2017. Reinforced concrete slabs with plastic voids slabs are a new and innovative type of structural, concrete slab system developed to allow for lighter selfweight of the structure while maintaining similar load carrying capacity of a solid slab.
Churakov 1 saintpetersburg polytechnical university, 29 polytechnicheskaya st. Voided slabs are a precast prestressed slab for bridge, building, marine pier and fish passage culvert replacement applications. A civil engineer must know all the aspects regarding the flat floor system. These slabs can be used in applications where slab depth may be an issue or when construction speed is a factor. Many of these changes are made possible through the use of new.
Voided slabs are ribbed slabs typifying empty spaces within the slab instead of the customary solid rc slabs. The main idea of the voided slab technology in rc systems is to eliminate concrete in the zones of a slab where, from a static perspective, there is no necessity for it. Frequently asked questions about flat plate voided concrete slab systems resource types. Cobiax plastic voided slab system faced a challenge in 20 in the construction of. The reinforcement details on the base sheets are adequate for all widths in this range. Voided slabs are a precast prestressed slab for bridge, building, marine pier and fish.
This guide presents information relative to the construction of slabonground and suspendedslab floors for industrial, commercial, and institutional buildings. If it can be imagined, concrete can help make it happen and there is a good chance voided concrete slabs will make it happen more flexibly. Refer to the pdf files listed below for project profiles. Biaxial hollow slab with innovative types of voids.
However, no attempt has been made to ensure that there were no errors in the conversion process. Example of airdeck slab construction 2 cobiax the cobiax system makes use of the same hollow slab principles of creating voids within the concrete. Bubbledeck behaves like a spatial structure as the only known hollow concrete floor structure. To receive a document password please follow the link below. Voided slab free download as powerpoint presentation. However, the longitudinal shear transfer mechanism often fails, leading. These void formers are most commonly made of plastic such as highdensity polyethylene, and may use recycled materials. Reinforcement detailing of reinforced concrete slabs. While the wheel provides a way to quickly and efficiently produce multiple round forms, handbuilding allows me to slow down and enjoy the whole clay experience in a much more relaxing way. These drawings are for information only and subject to the terms of use. The wsdot does not warrant the documents against deficiencies of any kind. The noise reduction with bubbledeck was 1 db higher than hollow core.
Crsi routinely receives inquiries concerning various aspects on the design and construction of flat plate voided concrete slab systems. Dec 05, 2019 voided slab bridge, trail approaches, and other items detailed in the plans and specifications, located in yamhill county, oregon. The economical span l of a reinforced concrete flat slab is approximately d x 28 for simply supported, d x 32 for an end span and d x 36 for an interior span. The tests reveal that the shear strength is even higher than. Forensic investigation of two voided slab bridges in the.
Voided solid slab project profiles osco construction group. German test certificate number psac 02iv065 according to din 41022 enclosure d3. Voided slabs layout1 1 concrete technology corporation. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. In construction application, longspan slabs can become very thick and require large.
The more recent development of posttensioning specifically for in. In association with daliform group srl, italy, we present isects system uboot beton, a voided slab technology that allows large spans, efficiently formed as flat plates without beams, for many types of buildings and other structures while using significantly less concrete than if solid. Weight saving polystyrene void formers, added at the precast factory, allow for construction of voided slabs with a significant reduction in self weight typically. Pci bridge design manual appendix b aashtopci standard products aashto solid and voided slab beams oct 97 dimensions inches type l h l1 l2 no. Circular voids are often incorporated into concrete bridge decks to reduce their selfweight without greatly reducing the flexural stiffness. Also explore the seminar topics paper on uboot with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2017 2018. All voided biaxial slabs incorporate an array of rigid void formers which contain air within the voids. Slabs and flat slabs lecture 5 19 th october 2016 contents lecture 5 designing for shear in slabs including punching shear detailing solid slabs flat slab design includes flexure worked example exercise punching shear. Innovative structural slab construction practices have taken the efficiency of traditional slab. Reinforced concrete effective span centretocentre distance between supports longer dimension of a rectangular panel of slab for yield line calculations modular ratio esec design bending moment per unit width of slab modified to account for axial load moment per unit width about xaxis moment per unit width about yaxis.
Wisconsin department of transportation bridge manual. This session discusses stateoftheart practices in voided slab technology. Jul 15, 20 innovative structural slab construction practices have taken the efficiency of traditional slab systems to new heights. This design guide presents stateoftheart practices in voided slab construction. Treat the slab between the beam and the phase line as an overhang. Design, serviceability, fire resistance, and construction flat platevoided concrete slab systems, which have been used for many years in. Already in the new millennium, many publications have supported the use of prefabricated bridge elements and systems. Plastic voided slab systems are an alternative to traditional concrete slab construction. You must have adobe acrobat viewer installed to view pdf files. Pdf voided biaxial slabs state of art researchgate. Flat platevoided concrete slab systems, which have been used for many years in europe and other parts of the world, are becoming increasingly popular in the united states because of their many inherent benefits. It is applicable to the construction of normalweight and structural lightweight concrete floors and slabs made.
Explore uboot with free download of seminar report and ppt in pdf and doc format. Design factors and the economical application of spherical type voids in rc slabs, in conference proceedings of people, buildings and. As an example for a 9 metre span between columns with multiple spans and requiring 1. The precast prestressed concrete voided slab structure is a popular bridge design because of its rapid construction and cost savings in terms of eliminating formwork at the jobsite. The required bubbledeck slab type is the next size up from the minimum bd voided slab thickness. Less waste sharper design voided biaxial slab designing out waste. Voided slab bridges built in 1957 superstructures are in poor condition and deteriorating quickly very difficult to rehabilitate continual maintenance. The department recommends utilizing wider precast units when possible to minimize the number of joints. Reported by committee 302 american concrete institute. Voided flat plate voided slab the concept of the voided slab is simple in that concrete mass is removed from the areas in the slab where it is not needed to resist load and as a result of the reduced dead load, voided slabs can span further. Alternately, consider placing the phase line between two beams. Only the design of slab bridge will be used for illustration. Jan 19, 2016 the slab construction employed bubbledeck, which precisely sets recycled plastic void formers that look like bowling balls in the hollow deck to displace concrete along the neutral axis. Design voided concrete slab and precast filigree panels under direct supervision of structural engineer experienced in design of this work and licensed in state of california.
Bridge manual standard drawings bureau of structures. Hollow biaxial slabs, also known as biaxial voided slabs, are reinforced concrete. Innovative structural slab construction practices have taken the efficiency of traditional slab systems to new heights. The division of engineering services des is the lead project delivery organization for the design, construction, and oversight of bridge and other transportation structures. With the bonded system the prestressing tendons run through small continuous flattened. Central mekong delta region connectivity project part iiannexes pages 58117 this environmental monitoring report is a document of the borrower. Slab supported directly by columns are called flat slab.
Slab may be supported on walls or beams or columns. This reduced the slabs nonaxial dead load by 30% while maintaining biaxial strength, and saved 786 cubic feet of concrete on the job. The slab construction employed bubbledeck, which precisely sets recycled plastic void formers that look like bowling balls in the hollow deck to displace concrete along the neutral axis. Guidelines for design of voidedslab systems youtube. The more recent development of posttensioning specifically for insitu floor slab construction has result in the two mentioned system. Reinforced concrete slab voided biaxial slab thinner slab depth. With a voided slab the compression block is smaller and i dont know how to derive the equation for fc. Flood super voidslab, our trademark voided slab unit, is flood super wideslab with attached eps void formers that allows the slab to span further and reduces the unit self weight. This technical note contains a collection of typical questions, which mainly came from design professionals, including structural engineers, architects, field inspectors, code enforcement officials, and. At least 20 days prior to placing first voided concrete slab, contractor shall. Construction of unique buildings and structures, 2014, 6 21.
Voided concrete flat plate slab systems, which have been used for many years in europe and other parts of the world, are becoming increasingly popular in the u. Waffle slabs, banded or beam and slab system are structurally more efficient for increasing span lengths andor live load. In addition, i enjoy the ability to add textures and decoration at every step of the forming process from soft slab to leather. Performance of structural behaviour of bubble deck slab. The following is a list of standard construction documents.
However, their voids are placed on the underside of the slab rather than embedded within the slab, leading to lower shear strength and fire resistance. Aug 27, 2015 guide to the design and construction of reinforced concrete flat slabs contents membersof the projectsteeringgroup list of tables vii iv list of figures v 1. Frequently asked questions about flat plate voided. Voided slab is a method of virtually eliminating all concrete from the middle of a floor slab, which is not performing any structural function, thereby dramatically reducing structural dead weight. Voided concrete slabs provide an open floor plate with fewer columns and no beams to limit design and ultimate use possibilities. An introduction to bubble voided concrete flat slabs by kamron skaggs. The new prefabricated construction technology using bubbledeck slab is. Guide to the design and construction of reinforced concrete. Canadian construction association stipulated price contract.
Jul 18, 2014 the principal features of a flat slab floor are a flat soffit, simple formwork and easy construction. Flat plate voided concrete slabs, reinforced concrete floor systems, twoway slabs, voided slabs. Aug 03, 2017 flat platevoided concrete slab systems, which have been used for many years in europe and other parts of the world, are becoming increasingly popular in the united states because of their many inherent benefits. Request pdf flat platevoided concrete slab systems.
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