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. Im dealing with the problem, how to design the voided slab by using u boot system. Dec 28, 2019 a two way spanning voided biaxial slab construction compared to a traditional two way spanning non voided coblax slab construction reduction in the number of pillars. Statements consisting only of original research should be removed. Design guide for voided concrete slabs crsi resource materials. The required bubbledeck slab type is the next size up from the minimum bd voided slab thickness. The following sections from the pci design handbook include interaction curves, load tables, and section properties for various precast concrete components. Reduced weight can result in lower transport costs.
Innovative structural slab construction practices have taken the efficiency of traditional slab systems to new heights. A two way spanning voided biaxial slab construction compared to a traditional two way spanning non bubb,edeck biaxial slab construction as this floor type is made of complete prefab elements with no structural coherence, support moments. 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. Chapter 5 concrete structures page 52 wsdot bridge design manual m 2350. Concrete is poured around these plastic forms to create internal voids in the slab. Glenium 51 is free of chlorides and complies with astm c494, type a and.
For products having recycled content, documentation indicating. Design guide for voided concrete slabs crsi resource. Jul 15, 20 innovative structural slab construction practices have taken the efficiency of traditional slab systems to new heights. Download free excel spreadsheet for concrete design. Design of flat plate voided concrete slab systems authors. It has a new functionality checkbox in project setting dialog. Montana department of transportation mdt bridge standard drawings.
Perhitungan voided slab jombor fly over yogyakarta oleh. Bubble deck slab seminar report, ppt, pdf for civil. To investigate the punching shear capacity of the scc voided slabs five slabs of. The washington state department of transportation wsdot makes these documents available on an as is basis. While concrete has been used for thousands of years, the. These void formers are most commonly made of plastic such as highdensity polyethylene, and may use recycled materials. You can access tables from previous editions of the handbook as well as the current edition. This reduction in the flexural stiffness of voided slabs could be attributed to following. This session discusses stateoftheart practices in voidedslab technology construction. A voided slabs in which voids are developed to reduce the amount of concrete. These slabs can be used in applications where slab depth may be an issue or when construction speed is a factor. Biaxial design allows weight reductions in reinforcement. Voided slab free download as powerpoint presentation.
Also explore the seminar topics paper on bubble deck slab 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 2015 2016. The comparative results of reaction for voided and solid flat slabs are shown in table 2. Doese anyone know the code to be used for designing this slab system. This paper presents information on these benefits as well as requirements for serviceability, flexure, and shear. A prestressed concrete bridge deck for spans up to 300. A two way spanning voided biaxial slab construction compared to a traditional two way spanning non voided coblax slab construction reduction in the number of pillars. 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. Designing code for voided slab ingenuity structural 5 oct 18 07. Page 4 of 10 shear capacity in % of solid deck ad 2. Le dihybridisme pdf the concept is based on the fact that the area between columns of a solid slab has limited structural effect beyond adding weight.
Once concrete is poured over the balls in the panels, the bubbledeck system effectively becomes, and behaves like, a monolithic twoway slab that distributes force uniformly and continuously. Very good video showing step by step post tension slab duration. The concept centers on removing concrete mass from the areas of the slab where it is not structurally efficient. The main difference between a solid slab and a voided biaxial slab refers to shear resistance. This is a very efficient form of slab construction, it is also called a hollow block voided slab or pan joist system. The design concept for these types of units is identical and the only differences between them are the member depth, shape of the voids if any, and the casting procedure. A permanent formwork void former for reinforced concrete voided slabs.
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. This paper deals with voided slabs using uboot beton technology made by recycled polypropylene, the technology is des. Guidelines for design of voidedslab systems youtube. For additional explanations on using these tables, refer to the respective handbook editions. 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.
Data voided slab lebar jalan jalur lalulintas b1 7. Frequently asked questions about flat plate voided concrete slab systems resource types. The stress raising effect of the voids should therefore be accounted for in the analysis of a voided slab once the void diameter ratio exceeds 0. Aci guidelines for design of voided slab systems youtube. Mar 28, 2020 cobiax slab pdf voided biaxial slabs are reinforced concrete slabs in which voids reduce the amount of concrete. Adjacent prestressed concrete slab units and box beams are especially appropriate at stream. The fileopen plugin works with adobe reader and other viewers. Punching shear behavior of voided reinforced concrete flat. Conclusion according to the analysis such conclusion can be drawn.
In comparison with the solid slab sol, the voided slabs gave smaller flexural stiffness, about 11. Evos slab system is a cme special biaxial, voided slab system developed and manufactured by cobiax middle east dmcc to cover the disadvantages of all previous voided slab systems by improving the concrete displacement, stability and rigidity of void formers, all of that enhance the uses of evos system in the construction site. The icon for input of a new voided slab is located in service concrete. This design guide presents stateoftheart practices in voided slab construction. Voided biaxial slabs are reinforced concrete slabs in which voids reduce the amount of concrete. Frequently asked questions about flat plate voided. Voided slab concrete building technology free 30day. 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. As an example for a 9 metre span between columns with multiple spans and requiring 1. It may be reproduced free of charge subject to the material being accurate. However, if the compression zones height is not in the void free zone, in the ultimate limit state, a tbeam crosssection should be used 4.
This floor system allows for large, clear spans and efficient overall slab thicknesses. Pdf voided biaxial slabs state of art researchgate. The first crack appeared on the tension face of the slab around the column. 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. Mar 09, 2020 cobiax is a swiss made special biaxial voided slab system. Most attempts have consisted of laying blocks of a less heavy elab like expanded polystyrene between the bottom and top reinforcement, while other types included waffle slabs and grid slabs. Aug 20, 2019 voided biaxial slab teechnology according to the contractor this may be caused due to the high temperatures during construction. Cobiax is a swiss made special biaxial voided slab system. Reinforced concrete slab voided biaxial slab thinner slab depth. Moreover, the values of reaction taken from sap 2000 and by numerical calculation of interior bay are same for voided flat slab. Pdf a bubble deck slab is a technique of realistically disposing the concrete in. The cobiax flat slab has the same mechanical load bearing behaviour as a solid flat plate slab.
Open spandrel arches enable relatively long spans, more commonly built in steel or prestressed concrete, to be built efficiently in reinforced concrete. Designing code for voided slab structural engineering. It is decisively easier to keep structural records of the slab building elements and ccobiax building as a whole. Fanella, mustafa mahamid, and michael mota publication. This session discusses stateoftheart practices in voided slab technology. Voided concrete flat plate slab systems, which have. In addition to the very easy and fast cobiax elements distribution sitting on the bottom steel reinforcement, the construction implementation becomes much faster than any other slab system, this is due to the following facts. The results indicate that the total co 2 emissions are 257,230 and 218,800 kg co 2 for the ordinary reinforced concrete slab and the voided slab system, respectively. The highest contributor to co 2 reduction is the embodied carbon dioxide emissions of the building materials, which accounts for. Bubble deck slab seminar report, ppt, pdf for civil engineering. The established codes for the structural dimensioning of traditional concrete flat plate slabs are compatible with the. It is recommended that a solid isotropic slab can be used to idealise a voided slab when the void diameter to slab depth ratio is less than 0. The aim of the present invention is to provide slabs with a predetermined strength and to increase the strength of slabs across a wide range of manufacturable sizes by increasing the accuracy with which void formers arranged in a set manner in a reinforced concrete voided slab retain a set optimal shape.
The results have revealed that reaction of solid flat slab is higher than that of voided flat slab because of higher selfweight. Crsi routinely receives inquiries concerning various aspects on the design and construction of. While, the first crack of normal strength concrete voided slab snb appeared at 23. Voided biaxial slabs vbs are a resource efficient design for concrete slabs by incorporating voids which significantly reduce overall materials use. Voided slab 18 depth voided slab is a full deck unit for spans from 270 to 500. Strength of concrete pacific nw aggregates have consistently resulted in concrete strengths, which may. Quisque mollis dolor non tellus placerat vitae sodales lectus porta. The precast prestressed concrete voided slab structure is a popular bridge design because of its. Phase2 voided slab free download as powerpoint presentation. The check of voided slabs is available only for ecen and for such type of structure which enables using of 2d members. Explore bubble deck slab with free download of seminar report and ppt in pdf and doc format.
J joshi2, 3rohit raj, prem prakash mishra4, mamta kadhane5, bharati mohabey6 civil engineering, rajarshi shahu college of engineering, pune, maharashtra, india abstracta voided slab is a concept that simply removes the. Voided biaxial slab teechnology according to the contractor this may be caused due to the high temperatures during construction. This is just a sample lorem ipsum dolor sit amet, consectetur adipiscing elit. 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. Voided slab system shall be manufactured by bubbledeck.
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. 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. Frequently asked questions about flat plate voided concrete. Download free excel spreadsheet for concrete design of two way slab, voided biaxial slab, anchorage to concrete, anchorage to pedestal, circular column, concrete column, super composite column. As the span increases, the optimum form of construction changes to voided slab or beam and slab then box girder bridges. Voided slab site poured concrete mix design shall be marked approved by voided slab engineer. Pdf downloads free technical notes technical note etnb417 14 pp 2017. The main advantage of the ribbed floor is the reduction of the quantity of concrete and hence the considerable savings in the cost.
It may be reproduced free of charge subject to the. Ice manual of bridge engineering ice virtual library. Voided slab site poured concrete test cylinder results shall be marked approved by voided slab engineer. In order to read a secure pdf, you will need to install the fileopen plugin on your computer. 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. Span coverage of slab bridge solid slab up to 10m voided slab up to 15m prestressed concrete slab up to 25m positive aspects increases clearance above the afflux due to the shallow depth of slab gives clean attractive appearance has good lateral load distribution characteristics due to its good torsional stiffness requires low. Practice of uboot technology in the world bergamo italy itclab and research center 25,000 m2 naas ireland shopping center 50,000 m2 sclay france nanotechnologies research and development center cea 22,000 m2 23.
Cobiax slab pdf voided biaxial slabs are reinforced concrete slabs in which voids reduce the amount of concrete. For a voided biaxial slabs with spheres the shear resistance is proportional to the amount of concrete, as the special geometry shaped by the ellipsoidal voids acts like the famous roman arch, enabling all concrete to be effective. Mar 26, 2020 voided biaxial slabs are reinforced concrete slabs in which voids reduce the amount of concrete. Analytical study of solid flat slab and voided slab using. Voided biaxial slabs, sometimes called biaxial slabs, are a type of reinforced concrete slab. Due to bubbles existence, the cracking load decreased. The cobiax advantage for builders reduction ocbiax costs slabs, walls, columns and foundations can be optimised for the reduced loadbearing capacity they are lighter and.
416 835 1529 484 1060 94 1125 477 1244 1111 297 1503 1008 683 1310 457 1320 1144 69 1034 935 937 1283 1110 93 932 568 743 750 1546 702 1444 701 1044 1001 603 670 828 782 1045 910 238 256