Waffle slab or ribbed slab is a structural component which is plain on its top and contains grid like system on its bottom surface. In the girder library, double click on your voided slab object to open the editing window. For a comprehensive comparison between twoway slabs and plastic voided slabs, a study must consider not only different bay sizes, but also span conditions and different weights. Slabs are lighter because less concrete is used in voided slab. The required bubbledeck slab type is the next size up from the minimum bd voided slab thickness. Research article seismic response reduction of structures equipped with a voided biaxial slabbased tuned rolling mass damper shujinli, 1 limingfu, 1,2 andfankong 1 school of civil engineering and architecture, wuhan university of technology, luoshi road, wuhan, china hubei synthetic space building technology co. The slab haunch, also known as the slab pad, is the build up of concrete between the girder and the slab that accomodates geometric effects of. A hollow core slab, also known as a voided slab, hollow core plank or simply a concrete plank is a precast slab of prestressed concrete typically used in the construction of floors in multistory apartment buildings. Voided slabs layout1 1 concrete technology corporation. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. For slab analysis a fem computer program is used, 5. As needs change, your building is better prepared to adapt. This paper concludes for voided slab, the punching strength with steel fiber 0.
High density polythene hdpe hollow spheres are placed in the center of slab by replacing the ineffective concrete to decrease its dead weight so increase the efficiency. Wed like to understand how you use our websites in order to improve them. Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. Through this method, it would be possible to materialize longspan voided. Accepted like a standard solid slab same regulations as for a solid slab directly incorporated in eurocodes. Prepared for the pci hollow core slab producers committee john e. Europe, north america, oceania, and so on so this paper verified structural concept and performance, economic effects of twoway void slab and analyzed co2 emission reduction effect through construction materials.
Perhitungan voided slab jombor fly over yogyakarta oleh. Articles from the past year selected by our editors. This design guide presents stateoftheart practices in voided slab construction. Forensic investigation of two voided slab bridges in the. These void formers are most commonly made of plastic such as highdensity polyethylene, and may use recycled materials. Development of improved connection details for adjacent. Concrete slabs can develop voids from a variety of reasons, ranging from sliding soil beneath the slab displaced because of a lack of proper compression, to water erosion slowly washing away the soil over time. This paper deals with voided slabs using uboot beton technology made by recycled polypropylene, the technology is des.
Plastic voided slabs are capable of reducing the amount of concrete. Flat slab analysis and design free version download for pc. The guiding principle, is that building owners and designers can get the advantages of a thin twowayspanning flatplate structure while the structural engineer can lighten the floor. This product innovation evolved due to the requirement of our customers to achieve greater structural spans whilst reducing the overall building mass and maintaining the benefits of our flood wideslab.
As a voided biaxial slab with spheres only acts like a solid slab, the fire resistance is just a matter of the amount of concrete layer. To resize a stamp, click it, and then drag a corner handle. Revit slab cut by void family a how to guide revit. Design guide for voided concrete slabs crsi resource. Comparative structural analysis of biaxial voided slabs and solid weight of the slab while meeting load capacity requirements. If you continue browsing the site, you agree to the use of cookies on this website.
Attila beres as primary author of its design guide on voided slabs published in 2014. Modeling decks not available through the bridge modeler must be done with direct methods. Voided twoway flat plate slabs apr, 2009 by mike mota, ph. They may be supported on two opposite sides only fig. Modeling decks not available through the bridge modeler. On the permanent strands tab define all the possible locations to put strands in the section. Voided slab system the voided slab system proposed in this study combines the post tension method with the concrete casting in place voided slab system which uses paper tubes for void former materials see figure 1. Innovative structural slab construction practices have taken the efficiency of traditional slab systems to new heights.
All voided biaxial slabs incorporate an array of rigid void formers which contain air within the voids. Sei in articles, infocus this article is currently only available in pdf format, please click the link to the top right. Analytical study of solid flat slab and voided slab using. The bridge modeler provides design templates for conventional decksection types, including flat slab, concrete box girder, and steel girder with a castinplace deck. Voided slab free download as powerpoint presentation. As an example for a 9 metre span between columns with multiple spans and requiring 1. However, the test results in this research showed that the voided slab would emit more carbon dioxide emissions. From excavation to toppingout, the positive contribution of voided slab weight reduction alone delivers surprising advantages for owners, designers and. Waffle slab or ribbed slab construction procedure and. A voided slabs in which voids are developed to reduce the amount of concrete. Seunguk na, inkwan paik and sungho yun, evaluating the floor.
The advanced modeling features available for direct bridgedeck modeling include the following. These slabs can be used in applications where slab depth may be an issue or when construction speed is a factor. Moreover, the effect of slab end conditions was investigated. Traditional voidedslab forming systems that have been used include waffle slabs, singleand doubledirection span forming systems, and hollowcore precast slabs. Reinforced concrete slab voided biaxial slab thinner slab depth. 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.
Allows for soil expansion to approximately 80% of specified void. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. The sequence of these possible strand locations is important. Slab haunch dimension is the vertical distance from the bottom of the slab to the top of the girder anywhere along the girder. Analytical study of solid flat slab and voided slab using ansys workbench mr. Plastic voided slab systems are an alternative to traditional concrete slab construction. Design, serviceability, fire resistance, and construction article pdf available in practice periodical on structural design and construction 223.
These section of slab are replaced with some lighter is material. Guidelines for design of voidedslab systems youtube. Voided slab 18 depth voided slab is a full deck unit for spans from 270 to 500. Evaluation of structural performance and energy saving ability of.
Evaluation of the flexural performance and co2 emissions. This reduced the slabs nonaxial dead load by 30% while maintaining biaxial strength, and saved 786 cubic feet of. The void diameter is taken as 70 mm with a wall thickness of 1 mm and is assumed to be made up of hdpp. 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. The concept centers on removing concrete mass from the areas of the slab where it is not structurally efficient. Fpasc110 specification and application of void spaces below concrete foundations 11 november 2007 issued for website publication foundation performance association structural committee page 3 of 22 glossary carton forms are shoring elements designed to provide a void space between expansive soils and foundation systems, while providing a temporary support formwork. Title slide of voided slab slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
The results indicate that the total co2 emissions are 257,230 and 218,800 kg co2 for the ordinary reinforced concrete slab and the voided slab system, respectively. The detailed characteristics of the materials used in the voided slab are shown in table 2. The highest contributor to co2 reduction is the embodied carbon dioxide emissions of the building materials, which accounts for. A prestressed concrete bridge deck for spans up to 300. The concrete had a designed compressive strength of 27 mpa and comprised 333 kgm 3 ordinary portland cement, 821 kgm 3 fine aggregate, 1086 kgm 3 coarse aggregate, and 108 kgm 3 water. 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. Saccoman, chairperson james beerbower ernest markle kevin boyle james markle jeffrey butler milo j. Plastic voided slab systems are significantly lighter than solid concrete slabs while maintaining the ability to have large spans.
Many parameters must be considered when designing a concrete slab. Yadav jaideep purushottam department of civil engineering, nova college of engineering and technology, jafferguda, batasingram village, hayath nagar mandal, r. Voided concrete slabs provide an open floor plate with fewer columns and no beams to limit design and ultimate use possibilities. 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. Evaluation of the flexural performance and co2 emissions of the. Impact sound insulation performance of the voided slab. Flood voidslab, our trademark voided slab unit, is flood wideslab with attached eps void formers that allows the slab to span further and reduces the unit self weight. In the bridge view, double click on the girder you want to edit. The bubble deck slab is a newly designed biaxial concrete floor slab system. It done to reduce the dead the dead weight of the slab. The slab has been especially popular in countries where the emphasis of home construction has been on precast concrete, including northern europe and former socialist countries of. Voided slabs are a precast prestressed slab for bridge, building, marine pier and fish passage culvert replacement applications.
To delete a stamp, rightclick the stamp and choose delete. Oneway and twoway slabs university of asia pacific. Comparison of carbon dioxide emissions of the ordinary. Voided biaxial slabs, sometimes called biaxial slabs, are a type of reinforced concrete slab. The clear spacing between the voids varied between 30, 50 and 70 mm. The top of ribbed slab is normally thin and the bottom grid lines are generally ribs which are laid perpendicular to each other with equal depth. Research article seismic response reduction of structures. The study provides a recommendation with regard to how the virginia department of transportations structure and bridge division could revise its guidance on design, construction, and maintenance of adjacent member prestressed structures such as voided slabs to address issues identified in this study. It is a slab from which some part of concrete is removed near the area where it is less useful. Because of this efficiency, this system can withstand an increased load. Less waste sharper design voided biaxial slab designing out waste. Twoway flexural behavior of donuttype voided slabs. Voids can lead to a weakness in the slab, causing dips in the surface, tilting or cracks and breaks.