Voided concrete slabs provide an open floor plate with fewer columns and no beams to limit design and ultimate use possibilities. Shop drawing submittals for mndot approval will not be required when standard culvert sections are used. Forming voids in concrete concrete construction magazine. Box culvert a culvert in the shape of an enclosed rectangle and consisting of a bottom slab, two wall elements and a top slab. In order to use the cad file you must download both the cad and std files for that drawing. 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 study provides a recommendation with regard to how the virginia department of transportations structure and bridge division could revise its guidance. September 20 lrfd bridge design 123 height range to which it applies.
As needs change, your building is better prepared to adapt. Wisconsin department of transportation bridge manual. These slabs can be used in applications where slab depth may be an issue or when construction speed is a factor. Pdf voided slab systems were developed using segmented void. By using these drawings, you expressly consent to such terms. Receiver agrees that wsdot cannot be held responsible for problems arising from files which have been converted. Voided biaxial slabs vbs are a resource efficient design for. One hundred twenty major categories of fully editable and scalable drawings and details in autocad format. Design voided concrete slab and precast filigree panels under direct supervision of structural engineer experienced in design of this work and licensed in state of california.
Dgn standard bridge drawing in microstation design file format. 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. Alternately, consider placing the phase line between two beams. Innovative structural slab construction practices have taken the efficiency of traditional slab systems to new heights. Bridge cadd drawing menu idaho transportation department. With a voided slab the compression block is smaller and i dont know how to derive the equation for fc. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design. Flat slab analysis, design and detailing pdf civil engineering. Designing large spans between columns often requires the use of support. Montana department of transportation mdt bridge standard drawings. Designer supplement to the standard bridge drawing in adobe portable document format. 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. Since revisions or additions to the design file drawings may occur at any time, the receiver agrees to indemnify, defend and hold. Sandwich slabs may have the disadvantage of a larger weight compared to the ribbed ones but on the other hand, they have the advantage that their spans and supports behave in the same proper way.
These are a perfect starting point for modification to meet your particular needs or just to use as is without changes. You can access tables from previous editions of the handbook as well as the current edition. In cases where a standard drawing or bddm design requirement is not applicable to the project circumstances and must be modified, a design deviation is necessary. Floor slab construction introduction when developing a scheme for a structure, the choice of. Forensic investigation of two voided slab bridges in the. Comprehensive design example for prestressed concrete psc girder superstructure bridge with commentary task order dtfh6102t63032 us customary units submitted to the federal highway administration prepared.
The standard design tables are based on welded wire fabric reinforcement with a yield strength of 65 ksi and a concrete clear cover of 2 inches. With more than 80 locations nationwide, our products are. New york state department of transportation coordinates operation of transportation facilities and services including highway, bridges, railroad, mass transit, port, waterway and aviation facilities. They provide the advantages of having low clearances due to their small section depths, accelerated construction times, and high torsional stiffness. If the engineer plots a stress and strain diagram through a typical. Hello friends, in this video we will learn, how to read and understand of slab drawing. For additional explanations on using these tables, refer to the respective handbook editions. Structural details of slab culverts 3 for spans less than 3. A total of 82 models are analyzed and their beam forces, reactions have been compared with respect to span. If you would like to download the entire detail set in one archive, please click the link below. Caltrans precast concrete committeecaltrans precast.
The following sections from the pci design handbook include interaction curves, load tables, and section properties for various precast concrete components. Development of improved connection details for voided slab bridges patrick c. These drawings are for information only and subject to the terms of use. Oct 22, 2017 hello friends, in this video we will learn, how to read and understand of slab drawing. 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. Subscribe to the standard drawing email list to stay informed. Offsystem 24ft rdwy bridge standards available for download prestressed igirder standards are available for structures with type tx28 thru tx62 girders. Pdf standard bridge drawing in adobe portable document format. Prestressed concrete specialist caltransprestressed concrete specialist, caltrans. Flat slab haunched slab a longitudinal slab is one of the least complex types of bridge superstructures.
These are included in our issued set of prestressed concrete igirder standards. Design guide for voided concrete slabs design guide 56 pp 1st edition table of contents. Caltrans precast concrete committeecaltrans precast concrete. Slab may be supported on walls or beams or columns. Joyce abstract adjacent voided slab bridges avsb are economical systems for short spans. This floor system allows for large, clear spans and efficient overall slab thicknesses. Precast options for bridge superstructure design john r. Voided biaxial slabs vbs are a resource efficient design for concrete slabs by incorporating voids which significantly reduce overall materials use. Culvert extension a portion of a culvert built beyond the limits of a previously existing culvert. Development of improved connection details for voided slab. However, no attempt has been made to ensure that there were no errors in the conversion process. The following conclusions can be drawn from the results of the. Canadian precastprestressed concrete institute bob stofko, p.
Bridge approach slab for prestressed concrete cored slab unit subregional tier. A typical 6 inch voided slab will give a coefficient of thermal conductivity of around 1. For the designed span, deck slab depth is selected from table. 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. In this thesis a manual analysis for both longitudinal and transverse direction of voided slab bridge is done as per the.
Waffle slabs are a common type of hollowcore slab which use the same principle as voided biaxial slabs. On most jobs the advantage of placing services within a void can readily be combined with the structural benefits of. The precast prestressed concrete voided slab structure is a popular bridge design because of its rapid. California department of transportation caltrans precast concrete committeecaltrans precast concrete committee update jim ma, p. Insitu voided slab design aci concrete design structural. A cobiax slab has rotationally void formers as is shown in figure. Under superimposed dead loads and live load, girders are continuous, hence the term semicontinuous. With more than 80 locations nationwide, our products are always close at hand. Technical thestructuralengineer 35 technical guidance note. Standard drawings standard specification drawing files in dgn and pdf formats. In addition to eliminating expensive and failure prone joints, this approach also is more structurally efficient. Strength of concrete pacific nw aggregates have consistently resulted in concrete strengths, which may.
Voided slab decks are usually constructed with cast in situ concrete. This technical guidance note provides information about a number of. Introduction to the voided slab concept history of voided slab systems design concepts a design guide for voided concrete slabs. Slabs and flat slabs lecture 5 19 th october 2016 contents lecture 5 designing for shear in slabs including punching shear detailing solid slabs flat slab design includes flexure worked example exercise punching shear. Standard drawing baseline reports are also available for each drawing. Oct 2017 in note 2, replaced sheet number with typical prestressed slab details sheet. This design guide presents stateoftheart practices in voided slab construction.
Reinforcement detailing of reinforced concrete slabs. Bridge drawings and details south carolina department of. For adjacent slab or box beam superstructures, place the phase line at the edge of the beam, as shown in figure 32 and figure 33. Jul 15, 20 innovative structural slab construction practices have taken the efficiency of traditional slab systems to new heights. Voided slabs are a precast prestressed slab for bridge, building, marine pier and fish passage culvert replacement applications.
The concept centers on removing concrete mass from the areas of the slab where it is not structurally efficient. If you have difficulty locating a particular drawing, please contact our engineering staff via email. Chapter 18 concrete slab structures january 2019 183 18. 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. 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. Slab supported directly by columns are called flat slab. This help file describes input and analysis features of slab bridge designer 2. Mccormick rankin corporation paper prepared for presentation at the bridges economical and social linkages session of the 2007 annual conference of the transportation association of canada. Pci bridge design manual appendix b aashtopci standard products aashto solid and voided slab beams oct 97 dimensions inches type l h l1 l2 no. This session discusses stateoftheart practices in voided slab technology. Chapter 5 concrete structures page 52 wsdot bridge design manual m 2350. Treat the slab between the beam and the phase line as an overhang.
See miscellaneous standards section in the list for all additional standard drawings required. All voided biaxial slabs incorporate an array of rigid void formers which contain air within the 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. When designing a reinforced concrete structure, a primary design limitation is the span of the slab between columns. These void formers are most commonly made of plastic such as highdensity polyethylene, and may use recycled materials. Bubble deck slab seminar report, ppt, pdf for civil. Bubbledeck slab section, it will be seen the redundant concrete i. The girders act as simple spans under self weight and the wet slab load. Since revisions or additions to the design file drawings may occur at any time, the receiver agrees to indemnify, defend and hold harmless wsdot, its officers, agents, and employees from and against any and all claims, suits, losses, damages or costs, including reasonable attorneys fees, arising from the use of outdated design file drawings, and such indemnification shall survive acceptance of said files by receiver.
Pci bridge manual appendix b, aashtopci standard products. Explore bubble deck slab with free download of seminar report and ppt in pdf and doc format. The oregon department of transportation provides the oregon standard bridge drawings by section and file type. Comprehensive design example for prestressed concrete. Guidelines for design of voidedslab systems youtube. Reinforcement detailing of a slab is done based on its support conditions. 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 commonly occurs to meet a project goal, incorporate new technology or to meet a technical requirement e. On the other hand, when slab is supported on all four sides. Forensic investigation of two voided slab bridges in the virginia department of transportations richmond district june 2017 6. Oldcastle precast is the leading manufacturer of precast concrete, polymer concrete and plastic products in the united states. The material amount is in reference of the structural drawing developed by viana 6. Figure 3 shows drawings of the general layout of the bridge.
However, the structural behaviors of twoway voided slabs with segmented voids. For adjacent slab or box beam superstructures, place the phase line at the edge of the beam, as shown in figure 3. Development of improved connection details for voided slab bridges. Beams, see lecture 3 punching shear requirements e. Twoway flexural behavior of donuttype voided slabs. Slab supported on two sides and bending takes place predominantly in one direction only is called one way slab. 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. Bubble deck slab seminar report, ppt, pdf for civil engineering. Wisconsin department of transportation bridge manual standard. The slab has been especially popular in countries where the emphasis of home construction has been on precast. Pdf twoway flexural behavior of donuttype voided slabs. Contact dave kiekbusch for questions about this page. Sandwich voided slabs in reality, sandwich voided slabs are ribbed slabs with a slab placed both on their upper and lower surface.