Revit precast lattice girder is read only hello, i need a lattice girder similar to the one that comes with the structural precast extension in revit 219 with the difference being that the default branches out into 2 bottom chords when i just need a straight top chord and bottom chord girder. Lattice girder article about lattice girder by the free. Structural engineers are asked to add the girder slab system specification guide to their general notes. Application and use of this information requires design by a registered professional structural engineer. The design of crosssections subject to combined bending, shear and axial force is covered in clause 6. Structural performance of precast concrete lattice girder. Lattice girder slabs function a floor system that serves as an alternative to conventional concreteinplace floors, in which a prefabricated slab with reinforcement serves as a permanent formwork for the final casting of the floors. Vt 20k the costeffective solid web girder gt 24 the versatile lattice girder with a high loadbearing capacity the peri vt 20k is the economical, 20 cm high solid web girder.
An estimated 70 % of all floors in these structures are executed with lattice girder. The safe use of these precast slabs with insitu topping as doubleaxis stressed slabs has been sufficiently proven through examinations. These are connected to the chords by means of electric resistance welding. This means clashes are avoided during the design and detailing. The lattice girder is manufactured using high strength steel wire. The load bearing behaviour of these semiprecast slabs with lattice girders is similar to in situ concrete slabs. The lattice girders are used mainly as reinforcement of prefabricated slabs and beams, where concreting is performed in two stages, offering the advantage of avoiding scaffolding and formwork needed in traditional construction. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Girder slabs are now part of the precast automation process, following similar configuration r. Jan 25, 2018 hello there sepakistan, im designing a long span structure for roof, this just an alternative instead of using peb.
Lattice girder dss cup lock scaffold ring lock scaffold. Creating a post and beam structure chief architect software. Kg produces lattice girders and is active in the area of semiprecast elements for over 60 years. Lattice girders are threedimensional, industrially prefabricated reinforcing elements.
In the same range of production planning, floordesk offers also a module for carrousel planning for the production of filigree lattice girder slabs. Avi lattice girders lattice girders lattice girders for half slabs special girders lattice girders with the complete reinforcement required for residential buildings girders with german approval advantages of the product secures the bonding between precast slabs. This new version of the precast for revit app now allows precast projects using lattice girder slabs. One such method is the use of precast concrete lattice girder slabs, or filigree slabs, as an alternative to insitu flat slab construction. The lattice girder slab consists of a thin precast concrete plank. Pdf lattice girder floor slabs tested application as a point. In the same range of production planning, floordesk offers also a module for carrousel planning for the production of filigreelattice girder slabs. Flooroffice, the complete and fully integrated software solution for hollowcore flooring and precast industries, supports all types of prefab floors. Once the design has been completed by the team and signed off by the client. Slightly different but with the same efficiency you can plan in an optimized way the filigrees on the tables. Multiflex the flexible girder slab formwork for all ground.
Pdf laboratory testing of the structural behaviour of. You can also make the section properties vary along the length of the girder. Analyses of whole slabs were carried out to investigate the demands of the deformation capacity of the lattice girder joint. Therefore, it is recommended that the rotation capacity is not limited by the horizontal cast joint. Our designdrawing department uses the latest software by allplan. Precast omnia floor slab precast concrete product keegan precast.
Autodesk 2d and 3d design and engineering software. Next, navigate to build floor build foundation from the menu. It has been supplanted in modern construction with welded or bolted plate girders. The market for lattice girders in the construction industry grows continously worldwide. They are cast with most, if not all, of the bottom reinforcement required.
All reinforcement used in manufacturing uses multicycled steel. Revit wall, floor and roof object style common edges, hidden lines and line weights cadclips duration. Girder slab technologies can help you determine whether or not the girder slab. The units are typically 50mm to 100mm thick and 1200mm or 2400mm wide. For structural engineering services in massachusetts and new hampshire please go to my web site. The objective of this work was to analyze and evaluate the situation at construction sites using lattice girder slabs, addressing the issues of design, manufacture and construction procedures con. The new autodesk structural precast extension for revit. To insert independent lattice girders click structure tab work plane tab set. It consists of a single 65mm precast concrete leaf, with a projecting lattice girder. A discussion of overall truss design considers primary analysis, secondary stresses, rigorous elastic analysis, cross braced trusses and truss deflections. Lattice girder slabs act as permanent formwork and as precast soffits for robust, high capacity composite floor slabs they are cast with most, if not all, of the bottom reinforcement. The girder nodes with minidovetail jointing ensures the stability of the gt24 formwork girder through a special node design in the timber chord. Dibt include ald truss girders for precast slabs with structural insitu concrete. Possible dimensions are stated below or can be found in the product range.
Girder slab technologies, llc 3 myers drive suite 10 mullica hill, nj 08062 phone. They showed that the loadcarrying capacity of a slab depends on the rotation capacity of the lattice girder. The system contains a precast plate flooring slab, which is composed of a thin reinforced concrete plate incorporating a steel lattice girder and all reinforcement required by design. Revit 2019 precast automation for lattice girder slabs. Versitile, cost effective precast omnia slab flooring. They can be assembled from small pieces and are particularly advantageous where site access is difficult.
In the type selector at the top of the properties palette, select girder slab lattice girder. Lattice girder slabs act as permanent formwork and as precast soffits for robust, high capacity composite floor slabs they are cast with most, if not all, of the bottom reinforcement required. Flat slabs are manufactured costeffectively from prefabricated slabs with lattice girders and a castinsitu concrete topping. Precast automation for lattice girder slabs youtube. On the general panel, change the room type to slab so there is no additional flooring on top of the slab foundation. This type of girder is a stocked product and therefore available at short notice. Product brochures dimensioning software technical guideline insulation values. Complete and fully integrated software for precast flooring. First, we have the precast lattice girder slabs which are one of the most. From the results in this study, it was concluded that the studied detailing of. Slab and girder bridges are used when the economical span limit of solid slab bridges is exceeded. The manufacturing process provides a prefinished fine textured smooth concrete finish on the soffit of the omnia slab. Precast concrete lattice girder slabs consist of a. Apr 18, 2018 revit wall, floor and roof object style common edges, hidden lines and line weights cadclips duration.
They showed that the loadcarrying capacity of a slab depends on the rotation capacity of the lattice girder joints. For simply supported spans, this limit is generally found to be nearly 10 metres and for continuous or balanced cantilever type structures, this limit is 20 to. Manage precast floors draw prefab floors design hollow core slabs plan precast. The most commonly used type of slab used along is the lattice girder slab. Product brochures dimensioning software technical guideline insulation. Pantex lattice girders have been developed for special demands in the field of tunneling. The growing demand of girders draws a need for girder production machines. Each item which is due to be casted into the panels, inclusive of the reinforcement and lattice girder, are detailed at this stage. Lattice girder floor slabs concrete plant precast technology. The omnia slab is a reinforced precast concrete slab which incorporates a lattice girder to provide stiffness and facilitate the placement of the top mesh.
Lattice girder slabs function a floor system that serves as an alternative to conventional concreteinplace floors, in which a prefabricated slab with reinforcement serves as a permanent formwork for the. Click structure tab model tab component dropdown place a component. It is a semiprecast floor system consisting of a precast. They consist of an upper chord and two lower chords and continuous truss wires.
Flat slabs with lattice girders according to european. World leading software for precast flooring flooroffice. Planning software for the production of filigreelattice girder slabs. When the order is placed, the lattice girder height h, lower chord diameter lc, upper chord size uc and diameter of diagonals d are specified. Omnia slab is a reinforced precast concrete slab incorporating a triangular lattice girder that is attached to a lower layer of reinforcement. Description lattice girders are threedimensional, industrially prefabricated reinforcing elements. Get answers fast from autodesk support staff and product experts in the forums. Design composite floors using lattice girder planks are designed in accordance with the relevant sections of eurocode 2. The intake slab formwork elements also consisted of peri system components featuring gt 24 lattice girders, sru steel walers and rcs rails. The diagonal lines of steel give support in all directions, helping to prevent the girder, which is one of the main support elements in a bridge design, from bending. The main bottom floor reinforcement is contained within the precast concrete leaf. May 01, 2020 a lattice girder is a type of girder with a crisscrossed web design, such as in gardening lattices, between the two edges of the girder. The top reinforcement mat is placed on site along with a layer of stitching reinforcement across the joint between slabs.
However, provided the shear force ved is less than 50% of the design plastic shear resistance vpl, rd and provided shear buckling is not a concern then the crosssection need only satisfy clause 6. Use of lattice girders in reinforcedconcrete floor plates is a widely practiced method of construction for conventional highrise building structures. Dss ring lock lattice girders are manufactured under the guidance of our exhaustive qaqc program and iso accreditation. The lattice girder provides rigidity to the slab when insitu concrete is poured onsite by a local provider. Lattice beam and block slabs the complete ital concrete lattice beam decking system is based on a european concept in use for more than 50 years. Precast concrete lattice girder flat slabs are designed and manufactured in accordance with european standards 1,2 but the importance of the various design parameters in precast lattice girder floor systems are not fully understood 3. Precast design department bespoke designs precast walls. While putting up lattice girder by means of textile slings the following rules have to be obeyed.
Some modules interact with the frame analysis and single span beam analysis, allowing you to effortlessly postprocess analysis results. Lattice girder elements, pilot experiment, bending, design and analysis method. The girder slab system design guide and technology is available for use by industry professionals. After reading this article you will learn about the design of slab and girder bridges. Current european standards force engineers to design the bending ultimate limit state design the floor slabs with lattice girders by applying en 199211. Lattice girder floor slabs tested application as a pointsupported slab. Cross sections is a software that draws in cad the entire dimensioning of the deck cross sections of bridges, viaducts and other similar structures in 2d. A lattice girder, like any girder, primarily resists bending.
Revit precast lattice girder is read only autodesk community. The lacing elements are typically attached using either hot rivets or threaded locator bolts. Pdf laboratory testing of the structural behaviour of precast. Fabrication, construction and assembly of the girderslab system and dbeam girder shall be in conformance with the girderslab system design guide v3. Filigree slabs the floor slab is made into a solid and monolithic reinforced concrete floor by using mixinsitu concrete that is poured at the construction site. The top reinforcement mat is placed on site along with a layer of stitching reinforcement across the joint between slabs, prior to pouring the insitu concrete. Once the design has been completed by the team and signed off by the client the 3d model is sent electronically into the host computer of the factory. The girderslab composite steel and precast system breaks new ground for multistory residential building superstructures. The lattice girder is manufactured using high strength steel wire which provides rigidity to the panel and enables it to bind easily with insitu concrete which is poured later on site. In the build foundation dialog, move the radio button under foundation type to monolithic slab and click ok. The filigree slab is a hybrid, semifinished slab construction with lattice girders. The following article describes the software modules for planning precast floor slabs in detail. The lattice girder slab consists of a thin precast.
Sketch additional girders onto a girder slab by clicking beginning and end points. It replaces conventional insitu slab systems with the associated problems of decking and support work and can easily be erected by unskilled labour. In the work plane dialog, select pick a plane and click ok. Girder slab technologies, llc is neither a subcontractor or material supplier. Available in the upcoming structural precast extension for revit 2019. The pantex system has been extensively tested and used successfully for numerous tunnel projects throughout the world. Girder design example of a first floor girder youtube. Sketch independent girders on girder slab precast assemblies. It is a semiprecast floor system consisting of a precast panel with a minimum thickness 40 mm, a lattice girder wire trusses, and bottom reinforcement. The new autodesk structural precast extension for revit 2019 blogs. We inform design and construction professionals, supply design tools and details, and assist the engineer of record on an as needed basis. Design, manufacture and construction of buildings with. The lattice girder was used prior to the development of larger rolled steel plates. The lattice girder provides rigidity to the slab when insitu concrete is poured on site by a.
Planning software for the production of filigreelattice. Girder slabs are now part of the precast automation process, following similar. Lattice girder slabs act as permanent formwork and as precast soffits for robust, high capacity composite floor slabs. Therefore lattice girders are best suited when slab. The growing demand of girders draws a need for girder. However, if cracking is allowed the crack width in the finished slab must be calculated. A lattice girder is a truss girder where the load is carried by a web of latticed metal. Autodesk structural precast extension for revit 2020. Trusses and lattice girders are important elements in building where they are used to support floors and roofs and provide bracing. The girder slab system and dbeam girder are available competitively from.
Every single lattice girder manufactured is proof tested in the factory to ensure the highest possible standard of quality is provided to our clients. Pantex lattice girders ensure an immediate support in the open span area. The component sections may typically include metal beams, channel and angle sections, with the lacing elements either metal plate strips, or angle sections. Effectiveness of lattice girders bft international. Hello there sepakistan, im designing a long span structure for roof, this just an alternative instead of using peb. The girder slab composite steel and precast system breaks new ground for multistory residential building superstructures. Select the bottom face of the girder slab assembly to set the work plane. Pdf lattice girder floor slabs tested application as a. The reason is that lattice girders are a basic 3dreinforcement for concrete precast elements, like floors or walls. Pdf realtime monitoring of concretelatticegirder slabs. For bridges, trusses can be economic for spans of 30m to 200m. Cad planning of precast floor slabs with autocad concrete plant.
169 1390 442 1251 1124 913 1268 1377 486 370 380 140 25 49 395 12 990 979 1518 871 1045 784 564 119 818 1407 96 1431 218 1255 1498 301 598 236 617 30 577 988 167 969 1393 501 1036 157 11 1302