A two way spanning voided biaxial slab construction compared to a traditional two way spanning non voided biaxial slab construction moreover,the slab will not explode due to the escaping of over pressurised gas from the feet 4 feet for each formwork that act as safety valves. A biaxial hollow slab system is widely known as one of the effective slab system which can reduce the self weight of slabs. The lightweight construction systems applied in europe, the u. Mar 26, 2020 cobiax slab pdf voided biaxial slabs are reinforced concrete slabs in which voids reduce the amount of concrete. Voided deck slab modelling using grillage wizard midas civil midas india. The comparative study of lightweight slab solutions in. Voided biaxial slab architectural elements architectural. Structural capacities of spherically voided biaxial slab. Jun 19, 2019 the twoway hollow slab system biaxial voided slab is an innovative slab system, being adopted all over the world as an alternate for the conventional solid slab. Twoway void slab is an efficient twoway slab system eliminating concrete form the middle of flat. Bubble deck slab seminar report, ppt, pdf for civil. Oct 22, 2019 this technique provides structural continuity across the entire floor slab the joints between elements are then redundant without any structural effect to create a seamless biaxial floor slab. Moreover, the failure mechanisms of svbs and solid slab system are evaluated and.
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. It reduces the selfweight up to 50% in comparison with solid slabs without significant change in its structural performance. International journal of trend in scientific research and. This reduced the slabs nonaxial dead load by 30% while maintaining biaxial strength, and saved 786 cubic feet of concrete on the job. Research article seismic response reduction of structures.
Of these types, only waffle slabs can be regarded to have a certain use in the market. This concept removes and replaces concrete from center of the slab, where it is less useful with lighter material in. While concrete has been used for thousands of years, the pdf dreams. Structural behavior of reinforced concrete oneway slabs. It reduces the selfweight up to 50% in comparison with solid slabs. Designing large spans between columns often requires the use of support. Recently, a structure system with a voided biaxial slab has been used widely in practical engineering, especially in europe 6, 7 and china. Voided concrete slabs provide an open floor plate with fewer columns and no beams to limit design and ultimate use possibilities. Jul 27, 2017 the bubbledeck system virtually eliminates dead weight concrete from the middle of a floor slab by incorporating recycled plastic bubbles as a void.
Hollow plastic balls bubboedeck inserted into the slab and held in place by reinforcing steel. While concrete has been used for thousands of years, the. Introduction the bubble deck slab is a revolutionary biaxial concrete floor system developed in europe in1990 is by jorgen breuning. A voided biaxial slab is created with the same capabilities as a solid slab, but with considerably less weight due to the elimination of superfluous concrete. The voided slab consists of void formers in shapes like spherical, donut, and cuboid. Joseph monier, a french gardener, patented a design for reinforced garden tubs in 1868, and later patented reinforced concrete beams and posts for railway and. Solid flat slab, voided slab, total deformation, long term deflection and live load deflection 1. The voided or hollow core system was created to reduce the weight of the concrete from the system. The full depth of the slab is reached by common concreting techniques and finished as necessary. Biaxial hollow slab with innovative types of voids pdf. Omnia system overview 4 benefits 5 construction details 67 bearing details 8 temporary support 9 cobiaxdeck system overview 10 benefits 11 design and construction 12 nationwide service 14 the omnia system from hanson building products is a precast floor panel that provides the direct equivalent of an insitu slab but provides the facility to combine precast and insitu concrete. Jul 21, 2019 bubble deck slab seminar report, ppt, pdf for civil engineering. New nautilus slab chart ribbing width 12 cm the loads considered for the preliminary calculation are the self weight of the voided slab and at total overload of 300 kg m2 thickness s1 cm 7 disclaimer.
Cobiax voided flat plate slab technologies are available worldwide. The voids are positioned in the middle of the cross section, where concrete has limited effect, while maintaining solid sections in top and bottom where high stresses can exist. 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. If the load acting on the slab is large or clear span between columns is more, the thickness of slab increases. Page 4 of 10 shear capacity in % of solid deck ad 2. Structural capacities of spherically voided biaxial slab svbs. Hollow biaxial slabs, also known as biaxial voided slabs, are reinforced concrete slabs in which voids allow to reduce the amount volume of concrete. This design guide presents stateoftheart practices in voided slab construction. The voided biaxial slabs technology is directly incorporated in international standards as the eurocodes, and various national codes such as the cur in the netherlands. As needs change, your building is better prepared to adapt.
The voided biaxial reinforced concrete slab, constructed using prefabricated voided modules and cast in situ reinforced concrete, has gained wide attention since its emergence as a new structural. Omnia and cobiax flooring systems hanson pdf catalogs. Voided deck slab modelling using grillage wizard midas. Based on twocriteria optimization problem, an optimal variant of the slab solution is determined. 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. Due to the bubbledeck technologys green credentials, the use of the. Voided biaxial slab last updated january 31, 2020 concrete is poured around these plastic forms to create internal voids in the slab. Request pdf structural capacities of spherically voided biaxial slab svbs demand for a lighter and safer concrete floor system to improve the span limit. These void formers are most commonly made of plastic such as highdensity polyethylene, and may use recycled materials. 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.
Voided biaxial slabs vbs are a resource efficient design for concrete slabs by incorporating voids which significantly reduce overall materials use. Bubbledeck biaxial hollow precast slab system youtube. 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. Explore bubble deck slab with free download of seminar report and ppt in pdf and doc format. A biaxial hollow slab system is widely known as one of the effective slab systems which can reduce the selfweight of slabs 1. 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. As a result, this allows the hollow slab to act as a normal monolithic twoway spanning concrete slab. Present study involves the experimental analysis of spherically voided biaxial slabs.
The idea was to create a hollow biaxial slab with the same capabilities as a solid slab, but with considerably less weight due to. Multistorey building in the future to develop constructions as flexible and generally applicable that they will be able to pick up changes in a time period reaching far into the next century. 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. For this reason, basic research in the field of reinforced concrete. The bubbledeck system virtually eliminates dead weight concrete from the middle of a floor slab by incorporating recycled plastic bubbles as a void. New ways in concrete construction the biaxial hollow deck. Unseen once in place, this voided slab system with its varied configuration options, can economically reduce concrete weight, reduce structural depth and carbon impact, increase clear spans without beams, improve resource efficiency for the life of the building, and more.
The slab has been especially popular in countries where the emphasis of home construction has been on precast. Pdf experimental study on voided biaxial slab and its application. The bubbledeck technology uses spheres made of recycled industrial plastic to create air voids while providing strength through arch action. Voided biaxial slab wikimili, the best wikipedia reader. 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. The steel reinforcement is of grade fy60 strength or.
International journal of trend in scientific research and development ijtsrd international open access journal issn no. 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. Experimental study of behaviour of voided bubble concrete slab. Jun 26, 2019 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 are absent, resulting in increased technologgy consumption.
All voided biaxial slabs incorporate an array of rigid void formers which contain air within the voids. Voided biaxial slabs are reinforced concrete slabs in which voids reduce the amount of concrete while concrete has been used for thousands of years, the use of reinforced concrete is usually attributed to josephlouis lambot in 1848. In principle, voided biaxial slabs act like dobiax slabs. Bubble slab is a biaxial hollow core slab invented in denmark. Research article seismic response reduction of structures equipped with a voided biaxial slab based 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. Biaxial hollow slab with innovative types of voids. 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. Analytical study of solid flat slab and voided slab using. 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. Crosssectional diagram of a typical voided biaxial slab.
Voided biaxial slabs are reinforced concrete slabs in which voids reduce the amount of. Bubble deck slab seminar report, ppt, pdf for civil engineering. The creation of the voided slab was invented in the 19th. The comparative study of lightweight slab solutions in terms. This has been fobiax by a life cycle analysis of the product from manufacture to sustainable demolition. Biaxial voided slabs are reinforced concrete slabs in which the voids allow concrete to be reduced. This reduction in the flexural stiffness of voided slabs could be attributed to following reasons.
Seismic response reduction of structures equipped with a. All tested buildings are proven safe, and are reopened. The finite element models of the office slabs created for this study in sap verify the prior analysis and experiments. The void formers are produced in a variety of shapes depending on the design of the slab. The analyses indicated that the flexural capacities of spherically voided biaxial slabs are very close to solid slabs of equal dimension, especially when considering long span slabs. Waffle slabs are a common type of hollowcore slab which use the same principle as voided biaxial slabs. The concept centers on removing concrete mass from the areas of the slab where it is not structurally efficient. But the use of concrete, with its high consumption of resources, can be usefully optimised by the implementation of intelligent voided building methods. The intention was to eliminate the unused concrete in massive slab constructions. A square and a rectangular slab models with a thickness of 28 cm were developed as solid and voided, simulated under uniform load including seismic force to compare the deflection responses and structural capacities of these slabs by conducting a pushover analysis in ansys 16. 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.
It reduces the selfweight up to 50% in comparison with solid slabs without. Download free excel spreadsheet for concrete design. In buildings, most of the concrete is used in the slabs. One of the most dangerous zones of biaxial voided slabs is the slab column connection and zones where concentrated loads are applied. Voided biaxial slabs, sometimes called biaxial slabs, are a type of reinforced concrete slab which incorporates airfilled voids to reduce the volume of concrete required. Voided biaxial slab metadata this file contains additional information such as exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. Pdf experimental study on voided biaxial slab and its. Apr 30, 2019 an early example is the pantheon in romebuilt ad. Effect of void former shapes on oneway flexural behaviour of. Cobiax slab pdf voided biaxial slabs are reinforced concrete slabs in which voids reduce the amount of concrete. It leads to consume more material such as concrete and steel due to this, selfweight of. A bubbledeck slab has a twodimensional arrangement of voids within. These biaxial slabs have many advantages over a conventional solid concrete slab. They determine the division of the building into individual rooms or at least dictate the structure of the aesthetic impression.
Aug 30, 2019 cobiax slab pdf voided biaxial slabs are reinforced concrete slabs in which voids reduce the amount of concrete. 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. Pdf voided biaxial slabs state of art researchgate. Voided biaxial slab project gutenberg selfpublishing. The main disadvantage of concrete constructions, in case of horizontal slabs, is the high weight which limits the span.
It is a method of virtually eliminating all concrete from the middle of a floor. Advanced forming system for voided biaxial slabs w. Economical and easy bubgledeck transport, handle and store, also outdoors. Originating from onespanning hollowcore slabs, recent developments on voided slab technology have been aimed at reducing the dead weight and thus enhancing the span of the structure floors. Hollow biaxial slabs, also known as biaxial voided slabs, are reinforced concrete. We recommend that you register using the same email address you use to maintain your asce member account. When designing a reinforced concrete structure, a primary design limitation is the span of the slab between columns. Voided biaxial slabs, sometimes called biaxial slabs, are a type of reinforced concrete slab. New ecofriendly twoway void slab taeyoung jang1, a, sangmo kim2, b. New types of reinforced concrete voided slabs cast in place with plastic void formers need to be researched. Nakul kabra2, hemant ahire2, jayesh burad2, swapnil kate ssistant professor, department of civil engineering. Flexural behaviour of biaxial slabs voided with spherical. The invention of the hollow slabs, also known as biaxial voided slabs, was in 1950s 4.
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