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. You must have adobe acrobat viewer installed to view pdf files. With acrobat reader dc, you can do more than just open and view pdf files. At the end of your monthly term, you will be automatically renewed at the promotional monthly subscription rate until the end of the promo period, unless you elect to. Voided slabs are a precast prestressed slab for bridge, building, marine pier and fish passage culvert replacement applications. A prestressed concrete bridge deck for spans up to 300. Technical thestructuralengineer 35 technical guidance note. 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. 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. Traditional voided slab forming systems that have been used include waffle slabs, singleand doubledirection span forming systems, and hollowcore precast slabs. One of the more recent innovations is voided slabs, where plastic voids are cast within concrete after being placed in a precise grid. Bridges manufactured by oldcastle precast, a pci certified plant, offer a low maintenance, durable, low cost bridge system. Plastic voided slab systems are significantly lighter than solid concrete slabs while maintaining the ability to have large spans.
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. Flat plate voided concrete slabs, reinforced concrete floor systems, twoway slabs, voided slabs date. Find, read and cite all the research you need on researchgate. Scon infrastructure is specialised in field of prestressing and manovering in both buildings as well as bridges. Design, serviceability, fire resistance, and construction article pdf available in practice periodical on structural design and construction 223. Guidelines for design of voidedslab systems youtube. Voided flat slab with drop panels 25 to 30 0,225 0,25 0,3 0,35 prestressed flat slab 40 0,2 0,25 0,3 voided prestressed flat slab 35 0,225 0,25 0,3 0,35 0,6 3 design concepts for flat slabs 3. If you would like to download the entire detail set in one archive, please click the link below. These void formers are most commonly made of plastic such as highdensity polyethylene, and may use recycled materials. This session discusses stateoftheart practices in voidedslab technology.
As per the provisions made in aci 31811, check for deflection due to live load and longterm deflection has been studied for the solid flat slab and voided slab system to obtain its structural efficiency. It is now gaining popularity both in europe and in asia. Support bridgesight has been involved with the pgsuper project since its inception. This session discusses stateoftheart practices in voided slab technology. Design guide for voided concrete slabs crsi resource materials. Reducing greenhouse gas emissions and costs with the. The measurements and ratings were carried out in regulation with iso 1404. It was invented by jorganbreuningof denmark about 20 years ago. 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. The highest contributor to co2 reduction is the embodied carbon dioxide emissions of the building materials, which accounts for 34,966 kg co2. Biaxial hollow slab with innovative types of voids.
The required bubbledeck slab type is the next size up from the minimum bd voided slab thickness. Data voided slab lebar jalan jalur lalulintas b1 7. This reduces the deadload of the slab, which may be as much as 35 percent, enabling longer spans to be covered. Voided slab concrete building technology free 30day. Pdf twoway flexural behavior of donuttype voided slabs. Offer starts on jan 8, 2020 and expires on sept 30, 2020. Forensic investigation of two voided slab bridges in the. This design guide presents stateoftheart practices in voided slab construction. Pdf voided slab systems were developed using segmented void formers such as spherical or. The fileopen plugin works with adobe reader and other viewers. Gcs and subcontractors are viewing any new systems with. The versatility of these slabs makes them a good fit for many. 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. Jun 01, 2014 title slide of voided slab slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
Fanella, mustafa mahamid, and michael mota publication. Analytical study of solid flat slab and voided slab using. 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. Pdf on nov 25, 2019, ahmed ismael adil and others published voided biaxial slabs state of art find, read and cite all the research you.
Voided slabs layout1 1 concrete technology corporation. The concept centers on removing concrete mass from the areas of the slab where it is not structurally efficient. Voided solid slab project profiles osco construction group. It done to reduce the dead the dead weight of the slab. Hence according to the structural efficiency point of view the voided slab shows good agreement. Its easy to add annotations to documents using a complete set of commenting tools. Accepted like a standard solid slab same regulations as for a solid slab directly incorporated in eurocodes. Modeling decks not available through the bridge modeler. The washington state department of transportation wsdot makes these documents available on an as is basis. Using modified material properties or modified slab behavior properties is a possible way to simulate such a voided slab, but the program only analyzes and designs solid slabs.
A voided slab is a concept that simply removes the excess concrete from the expensive part of the structure slab. Design, serviceability, fire resistance, and construction article pdf available in practice periodical on. Reinforced concrete slab voided biaxial slab thinner slab depth. The advanced modeling features available for direct bridgedeck modeling include the following. By reducing the weight of the slab without compromising its structural strength, it is possible to create a thicker slab to support more weight over a longer span. In order to read a secure pdf, you will need to install the fileopen plugin on your computer. If you are talking about a thin top slab and a thin bottom slab with air between them, thats beyond the scope of the program. All warranties and representations of any kind with regard to said documents are disclaimed, including the implied warranties of merchantability and fitness for a particular use. Hollow biaxial slabs, also known as biaxial voided slabs, are reinforced concrete slabs in. Pdf voided biaxial slabs state of art researchgate.
Design guide for voided concrete slabs 10dg voided. Several vbs technologies have been introduced over the last few decades, primarily to reduce the weight of buildings, and designs now have comparable strength to solid slabs. This technical guidance note provides information about a number of. All voided biaxial slabs incorporate an array of rigid void formers which contain air within the voids. Modeling decks not available through the bridge modeler must be done with direct methods. Spherical void formers in concrete slabs request pdf. 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 needs change, your building is better prepared to adapt. In 2007 the london concrete association released a paper about the construction of a library leading to the pattern of semiprecast cobiax slabs stephenson, 2007. These section of slab are replaced with some lighter is material.
If you continue browsing the site, you agree to the use of cookies on this website. Hollowcore slabs, also known as voided slabs, initially appeared as oneway elements in europe during the 1950s, and are still commonly manufactured in precast form for. Innovative structural slab construction practices have taken the efficiency of traditional slab systems to new heights. Design of flat plate voided concrete slab systems authors. In this thesis a manual analysis for both longitudinal and transverse direction of voided slab bridge is done as per the industrial standards. The economic efficiency of the ordinary reinforced concrete slab and the voided slab system were assessed by comparison of the total costs of construction. The void formers are produced in a variety of shapes depending on the design of the slab.
As an example for a 9 metre span between columns with multiple spans and requiring 1. Ali, 20 flexural capacities of twoway reinforced concrete bubble deck slabs of. Design guide for voided concrete slabs crsi resource. Voided slab 18 depth voided slab is a full deck unit for spans from 270 to 500. Floor slab construction introduction when developing a scheme for a structure, the choice of. The voids were created by introducing sphericalshaped highdensity poly propylene void formers in between the compression and. Traditional voidedslab forming systems that have been used include waffle slabs, singleand doubledirection span forming systems, and hollowcore precast slabs. This floor system allows for large, clear spans and efficient overall slab thicknesses. In general voided slab systems are economical for spans between 35 and 50 feet. The slabs were bd 285 mm, part of a standard party floor with ceiling and screed. Flat plate voided concrete slabs, reinforced concrete floor systems, twoway slabs, voided slabs. Voided concrete slabs provide an open floor plate with fewer columns and no beams to limit design and ultimate use possibilities.
Voided biaxial slabs vbs are a resource efficient design for concrete slabs by incorporating voids which significantly reduce overall materials use. For slab analysis a fem computer program is used, 5. Allows for soil expansion to approximately 80% of specified void height. It is a slab from which some part of concrete is removed near the area where it is less useful. Slabs are lighter because less concrete is used in voided slab.
Less waste sharper design voided biaxial slab designing out waste. These slabs can be used in applications where slab depth may be an issue or when construction speed is a factor. Each tutorial includes module files and step by step guidelines so you can improve your midas civil skills via completing a small project. 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. 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. Comparison of carbon dioxide emissions of the ordinary. Because of this efficiency, this system can withstand an increased load. Plastic voided slab systems are an alternative to traditional concrete slab construction. Perhitungan voided slab jombor fly over yogyakarta oleh. Its packed with all the tools you need to convert, edit, and sign pdfs.
Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. The highest contributor to co2 reduction is the embodied carbon dioxide emissions of. 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. This reduced the slabs nonaxial dead load by 30% while maintaining biaxial strength, and saved 786 cubic feet of concrete on the job.
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