Posttensioned pt slabs are typically flat slabs, band beam and slabs or ribbed slabs. Design seminar descriptions posttensioning institute. Posttensioning institute education pt applications. Whether the project is local or overseas, design codes from around the globe are available for reinforced concrete and post tensioned slab design. With the support of our inhouse stateoftheart design software, we are able to implement the latest techniques for applying and installing the pte system. Structural design software engineering international. Slabongrade and posttensioned slab software adaptsog. Post tensioned foundation a typical post tensioned foundation with the forms set and ready for concrete. In this article, ill be giving homeowners some necessary information about the characteristics, advantages, disadvantages, and common questionsconcerns that i receive regarding post tensioned foundations. Understanding of trends in building information modeling related to posttensioning. This has proven to be a savings factor, time is money. Concrete slab design software economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. Standard requirements for design and analysis of shallow posttensioned concrete foundations on expansive soils. Foundation is designed to resist or span over moistureinduced deformations in the soil below, while still maintaining its top surface within permissible level tolerances.
Design floors and foundations reliably and efficiently, saving time and money, and overcoming the most common concerns you face as a designer. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc. Posttension basics how posttensioned slabs are built. Application of 2d strip and 3d finite element method based software in design of posttensioned buildings.
Adapt corporation specializes in structural concrete design software for posttensioning, reinforced concrete, and prestressed beam, slab, foundation, building and bridge structures using finite element or equivalent frame analysis. Ptislab can be used to design or analyze both posttensioned and. Labor costs are also reduced because less material is used in slab construction and construction times are optimized. Homeowners are getting crushed by flawed posttension. Posttensioned slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on shrinkswell soils.
Unless specifically stated otherwise, all foundation parameters. The software contains the same example calculations made by calculator and. Design of posttensioned floors for wind and earthquake forces. Posttensioned foundation a typical posttensioned foundation with the forms set and ready for concrete. A post tension slab is a concrete slab or foundation that contains high tension cables running through the concrete to increase strength and reduce cracking typically in areas with poor soil conditions. Threedimensional 3d finite element software for the integrated analysis and design of concrete and posttensioned floor and foundation. Concrete is exceptionally strong in compression, but weak in tension.
Safe is the ultimate tool for designing concrete floor and foundation systems. In this article, ill be giving homeowners some necessary information about the characteristics, advantages, disadvantages, and common questionsconcerns that i. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Thats why builders posttension with increasing frequency in lieu of conventional rebar slabs. Safe is the ultimate tool for designing concrete floor. Specifically, chapter 2 summarises the major design objectives, including suggestions how thesb objectives can be met. Adapt corporation specializes in structural concrete design software for post tensioning, reinforced concrete, and prestressed beam, slab, foundation, building and bridge structures using finite element or equivalent frame analysis. Fundamentals of posttensioned concrete design for buildings. From framing layout all the way through to detail drawing production, safe integrates every aspect of the engineering design process in one easy and intuitive environment. The following table of prestress losses is recommended for the design of posttensioned members, and does not include friction or wedge set losses.
Rapt is a two dimensional post tension beamslab design software. Pt designer design of posttensioned concrete floors. The foundation gains tensile strength when the cables are tightened after the slab has been cast. Actual losses, whether greater or smaller than computed values, have little effect on the design strength of the member but do affect service load conditions i. To create a slab using this method, plastic sleevecovered steel cables are laid in a grid running in both directions. Our foundation plans are proprietary and require specialized training as recommended by the post tension institute. Rogers says they conducted over 2000 exams in 2007 and are ahead of that. Structural engineering software, spreadsheets, for analysis and design, including wood, lateral analysis, concrete, steel, aluminum, glass, masonry, bridge, foundation.
Post tensioned foundation information for the homeowner. Cypecads posttensioned concrete slabs for buildings module has been designed to carry out the design of the passive reinforcement of posttensioned slabs, using the forces that have been obtained from analysing the posttensioned tendons bonded or unbonded, whose properties have been introduced by the program users. Concrete slab design software economically design post tensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. Homeowners are getting crushed by flawed posttension cable foundations the switch from steel rebar to posttension cable by houston area home builders has delivered unmistakable results posttension cable foundations are failing earlier and. Focus will be on posttensioning design and analysis, and construction considerations. Design floors and foundations reliably and efficiently, saving time and money. Critical case study of design of a prominent posttensioned multistory building. Developed by jim rogers at evaluation and certification services publishers of post tension magazine, this program offers two programs, to certify installers of single strand unbonded posttensioning installers and bonded posttensioning installers. The posttensioning method is the best way to create stronger, more reliable concrete slabs. Posttensioning utilizes concretes inherent compressive strength to construct slabonground foundations. Increase your efficiency with bidirectional links to the industry leading bim products. This method is a better way to construct a slab foundation to be more resistant to cracking and deflection.
Calculation and the theory by which the software works are attached with this software s index, this thing is not seen. The program enables the user to define and design posttensioned concrete beams and slabs for any strap model the user has full flexibility in. The tricky part comes when concrete is poured into the forms. Usually a sign in the garage or stamp in the slab will indicate if your home has a post tension slab. Presentations will focus on design, analysis, and construction of posttensioned buildings and will include handson training on the design and analysis of new posttensioned building structures. Our topnotch engineering team expertly analyses project details and identifies opportunities to optimize the. Posttensioned concrete design spreadsheet program a pdh. Aside from the reinforcement, the construction of the foundation is the same as a conventional system. Reinforced concrete and posttensioned foundation mat. Under the hood, it is the same capable product our customers love. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen. Example 10 sign structure foundation design example statement.
Example 10 demonstrates a design procedure for a drilled shaft foundation for a cantilever sign structure. Adaptsog software for the design of posttensioned slabs on grade foundations on expansive and compressible soils. The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a posttensioned. In this free webinar dirk bondy and bryan allred discusses the latest edition of their book, posttensioned concrete principles and practice 3rd edition as well as present the latest version. How to create a concrete slab foundation using the post. To get the excel sheet join as loving fansub member to this channel. Longer spans can be achieved due to prestress, which can also be used to counteract deflections.
In the case of a post tension slab, steel cables are laid out in grid fashion inside the forms. Suncoast has a more depth and breadth of engineering talent than other posttension companies, with multiple professional engineers on staff, supported by a team of posttension technicians who work under licensed professional engineers using. Pt slabs offer the thinnest slab type, as concrete is worked to its strengths, mostly being kept in compression. This spreadsheet program provides for the design and analysis of posttensioned concrete oneway beam and slab systems and twoway flat plate slab systems. The cantilever supports a sign panel attached to the horizontal support. Over the years, we have joined many variations of design teams, to create dialogue and coordination to meet the demands of the projects. Meet the all new risa3d version 18 brings many new essential features to an all new interface, delivering increased easeofuse, improved workflows and maximized efficiency. Safe provides unmatched benefits to the engineer with its truly unique combination of power.
Posttensioned, reinforced concrete slab design software ram. Fundamentals of posttensioned concrete design for buildings part one. Posttension concrete slabs design course shift learning. The advantage of posttensioning is the internal compressive force it imparts on the concrete. Posttension introduces an external compressive force into the concrete before the foundation experiences soil induced movements. The example is only for the design of the shaft foundation. This should help the reader to rationally select an efficient overall structural concept for a. The power and flexibility of detailed floor, foundation and building design in one solution. Standard requirements for design of shallow posttensioned.
Posttensioning may be included in both slabs and beams to balance a percentage of the selfweight. Pretensioning is generally accomplished at a manufacturing. Twoway posttensioned design amsysco post tensioning. Download free, highquality cad drawings, blocks and details of posttensioned concrete organized by masterformat. Apart from certain technical considerations, this may be due to some conservatism inherent in foundation engineering.
Pt designer is a computer program for the design and analysis of linear posttensioned concrete. Structural function of pt foundation acts as a buffer between the soil below and the superstructure above to prevent unacceptable deformations in superstructure. Its more user friendly compared to other pt design softwares. Reinforced concrete and posttensioned foundation design software adaptmat product overview adaptmat is a versatile threedimensional 3d finite element fem analysis and design software for any configuration of conventionally reinforced or post tensioned foundation system. Posttensioned foundations are designed using the posttensioning institute pti method first published in 1980 and recently updated with its 3rd edition. How do i take etabs results to rcdc to design foundations. Post tension slab design software sethguthrie civilenvironmental 18 aug 16 19. Suspended slabs can include flat, twoway, waffle, and. Post tension slab design software structural engineering. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. The compressive stresses resist the anticipated tension stresses induced by the soil movements, enhancing the performance over a nonprestressed foundation. Reinforced concrete and posttensioned foundation mat design.
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