S, maximum strains of the midspan sectional concrete and strains of tendon are calculated according to actual date of the midspan deflection yc, which show whole structual working condition, as a result, method for fast test of structural bearing capacity can be deduced, which would make determining. Guidelines for design of voidedslab systems youtube. Modeling decks not available through the bridge modeler. All voided biaxial slabs incorporate an array of rigid void formers which contain air within the voids. Design memorandum washington state department of transportation. This design memorandum requires limitations on precast slab members for minimum depth, introduces new standard precast slab sections, and provides guidance for usage of temporary top strands. Evaluation of the flexural performance and co2 emissions of the. Perhitungan voided slab jombor fly over yogyakarta oleh.
A reinforced concrete slab is a crucial structural element and is used to provide flat. Analysis of voided deck slab and cellular deck slab using midas civil. 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. Scon infrastructure is specialised in field of prestressing and manovering in both buildings as well as bridges. Because of this efficiency, this system can withstand an increased load. Flat slabs may have drop panels at columns and columns may have capitals. Bubble deck slab types, material specification, installation, and. As needs change, your building is better prepared to adapt. Waffle slab twoway pan joist twoway joist slab, also called a waffle slab. Voided slab 18 depth voided slab is a full deck unit for spans from 270 to 500.
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. The concept centers on removing concrete mass from the areas of the slab where it is not structurally efficient. Modeling decks not available through the bridge modeler must be done with direct methods. Forensic investigation of two voided slab bridges in the. Ask question write article vip subscriptions popular questions. It is a slab from which some part of concrete is removed near the area where it is less useful. Make sure that the fonts are available on your computer. Fanella, mustafa mahamid, and michael mota publication. Flat plate voided concrete slabs, reinforced concrete floor systems, twoway slabs, voided slabs. 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. These void formers are most commonly made of plastic such as highdensity polyethylene, and may use recycled materials. 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. The results were used to write the official supplementary. However, the test results in this research showed that the voided slab would emit more carbon dioxide emissions.
This strip can then be analyzed by the methods that were used for rectangular beams, the bending moment being computed for the strip of unit width. Plastic voided slab systems are significantly lighter than solid concrete slabs while maintaining the ability to have large spans. Slabs are usually used in floor and roof construction. Reinforced concrete hollowcore slab is made with cores in one direction with the following points. Analyze and design flat slab or waffle slab floors. Analyses are for a onebaywide strip using the equivalent frame analysis method of the aci code. Load transfer in a oneway slab, b twoway slab nilson fig. Calculating quantity of steel bar placed in mesh form in a circular slab or dome discrete systems for signal processing massachusetts instit which is approximately equal to the length actually calculated above.
Plastic voided slab systems are an alternative to traditional concrete slab construction. Traditional voided slab forming systems that have been used include waffle slabs, singleand doubledirection span forming systems, and hollowcore precast slabs. These section of slab are replaced with some lighter is material. In windows, choose complete when you install acrobat, or choose custom and select the asian language support option under. 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. Oneway and twoway slabs university of asia pacific. Hence according to the structural efficiency point of view the voided slab shows good agreement. Flat plate voided concrete slabs, reinforced concrete floor systems, twoway slabs, voided slabs date. Innovative structural slab construction practices have taken the efficiency of traditional slab systems to new heights. The strip may have up to 20 spans and may have cantilevers at the ends. The grillage analogy in bridge analysis researchgate. The required bubbledeck slab type is the next size up from the minimum bd voided slab thickness. Jun 01, 2014 title slide of voided slab slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
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. Voided slab concrete building technology free 30day. 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. If you continue browsing the site, you agree to the use of cookies on this website. S, maximum strains of the midspan sectional concrete and strains of tendon are calculated according to actual date of the midspan deflection yc, which show whole structual working condition, as a result, method for fast test of structural bearing capacity can be deduced, which would make determining bearing. These slabs can be used in applications where slab depth may be an issue or when construction speed is a factor. 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. Less waste sharper design voided biaxial slab designing out waste.
Ali, 20 flexural capacities of twoway reinforced concrete bubble deck slabs of. Voided concrete flat plate slab systems, which have. Uboot beton find, read and cite all the research you need on. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. The analysis presented illustrates the behavior of bending moments, shear force, displacements, reactions due to.
The voided slabs are reinforced concrete slabs in which voids allow to reduce the amount volume of concrete. Bubble deck slab is a hollow, flat slab that spans in two directions, in which plastic balls are incorporated to replace, and therefore eliminate the. A prestressed concrete bridge deck for spans up to 300. About us our mission is to provide the highest quality structural floors possible through innovation in. Shear and punching strength of reinforced concrete voided slabs. By practical experience and lots of actual data on tens of prestressed concrete v. Jun 12, 2018 project team scrambles to reimagine library in steel. This design guide presents stateoftheart practices in voided slab construction. 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. In conventional slabbeam system, the load is transferred from slab to beam and ultimately beam to the column. This help file describes input and analysis features of slab bridge designer 2. This session discusses stateoftheart practices in voided slab technology. This floor system allows for large, clear spans and efficient overall slab thicknesses.
It done to reduce the dead the dead weight of the slab. This reduced the slabs nonaxial dead load by 30% while maintaining biaxial strength, and saved 786 cubic feet of concrete on the job. This reduced the slabs nonaxial dead load by 30% while maintaining biaxial strength, and saved 786 cubic feet of. Bruce buckley is a freelance writer and photographer based in. Theres not a lot of information out there about this topic what to do when you need both an underslab vapor retarder and an underslab void, probably because this situation is a regional condition.
Ross in the new yorker in the 1930s and collected in two books, the education of hyman kaplan and the return of hyman kaplan. Data voided slab lebar jalan jalur lalulintas b1 7. Scon infrastructure is specialised in field of prestressing and manovering in. Method for fast test of prestressed concrete voided slab. 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. The acrobat installation includes widthonly versions of many common chinese, japanese, and korean fonts, therefore distiller can then access these fonts in acrobat. Design, serviceability, fire resistance, and construction article pdf available in practice periodical on structural design and construction 223. Concrete slab types construction, cost, and applications. 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. Voided concrete slabs provide an open floor plate with fewer columns and no beams to limit design and ultimate use possibilities.
Here analysis of voided deck slab and cellular deck slab using midas civil. It is a common system for parking structures, elevator and stair areas. It was invented by jorganbreuningof denmark about 20 years ago. The versatility of these slabs makes them a good fit for many. For slab analysis a fem computer program is used, 5. Appendix b 3 nov 11 aashto solid and voided slab beams. The load per unit area on the slab becomes the load per unit length on the slab strip. Project team scrambles to reimagine library in steel 2018. A voided slab is a concept that simply removes the excess concrete from the expensive part of the structure slab. Design of flat plate voided concrete slab systems authors.
Need underslab vapor retarder and underslab void forms. A decrease in moments from solid to voided slabs is about 11%, 7% and 5. Not every part of the united states has the expansive soils that parts of colorado have. Design guide for voided concrete slabs crsi resource. Voided slab free download as powerpoint presentation. The floor loads are transferred to the beams, which are then transferred to the columns thus making it ideal for heavy load areas. Advanced floor concepts structural floors slab over void. Voided slabs are a precast prestressed slab for bridge, building, marine pier and fish passage culvert replacement applications. Apr 24, 2016 it is a slab from which some part of concrete is removed near the area where it is less useful.
Design guide for voided concrete slabs crsi resource materials. Analysis of voided deck slab and cellular deck slab using. Jul 15, 20 innovative structural slab construction practices have taken the efficiency of traditional slab systems to new heights. Thus exact quantity of steel can be worked out and neither waste will be there nor short quantity of steel has been arranged. Title slide of voided slab slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Its typically used when stiffness is important or if there are abnormally heavy loads. As an example for a 9 metre span between columns with multiple spans and requiring 1. Hyman kaplan, or hyman kaplan as he habitually signs himself, is a fictional character in a series of wellreceived, humorous stories by leo rosten, published under the pseudonym leonard q. Voided slab bridge deck composed of two continuous span is 17.
Proposed cross section of the composite bridge deck with nsc prefabricated slab and uhpfrc overlay, section 8. The load is transferred directly from slab to column in the flat slab. Traditional voidedslab forming systems that have been used include waffle slabs, singleand doubledirection span forming systems, and hollowcore precast slabs. Voided slabs layout1 1 concrete technology corporation. Method for fast test of prestressed concrete voided slab v. The advanced modeling features available for direct bridgedeck modeling include the following.
Design guide for voided concrete slabs paperback january 1, 2014 see all formats and editions hide other formats and editions. Project team scrambles to reimagine library in steel. Reinforced concrete slab voided biaxial slab thinner slab depth. The bridge modeler provides design templates for conventional decksection types, including flat slab, concrete box girder, and steel girder with a castinplace deck. December 10, 2010 by liz osullivan theres not a lot of information out there about this topic what to do when you need both an underslab vapor retarder and an underslab void, probably because this situation is a regional condition.
It is now gaining popularity both in europe and in asia. The paper deals with analysis of the voided deck slab and cellular deck slab for medium bridge span ranging from 7. 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. Analytical study of solid flat slab and voided slab using. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. 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. Using modified material properties or modified slab behavior properties is a possible way to simulate such a voided slab. Sep 03, 2011 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. 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. Slabs are lighter because less concrete is used in voided slab. Minimum depth limitations on precast slab members this design memorandum requires limitations on precast slab members for minimum depth, introduces new standard precast slab sections, and provides guidance for usage of. Rosten noted that he was asked if mr kaplan was his. The prestressed concrete voided slab standards include slab widths of.
1378 366 1403 990 712 183 774 1190 96 231 819 1024 1248 1482 1322 369 810 676 1646 687 1138 1523 1534 433 258 1444 538 433 685 1104 1245 1115 1534 779 1179 864 736 542 289 658 253 572 1247 451 1246