This report presents the structural engineering calculations of a posttensioned floor using parallel beams and oneway slab construction. Posttensioning may be included in both slabs and beams to balance a percentage of the selfweight. It provides an architect the freedom to work freely with his designs. For residential construction, tendons at 48 inches on center are common. Rapt is a two dimensional post tension beam slab design software. Design of post tensioned flat slab structures in ram. Slabongrade and posttensioned slab software adaptsog. Twoway posttensioned flat slab design in adapt builder 2018. Want to design concrete floors economically, with exceptional visibility into compliance, and efficiency while designing slabs, mats, and rafts.
Post tensioned foundation information for the homeowner. Grade the lot for positive drainage away from the foundation during and afterconstruction. Posttensioned slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on shrinkswell soils. The pti design procedure is used to design a slabon grade foundation that will respond elastically to forces the foundation is exposed to. Design method may not be used for twoway, posttensioned slab systems. Typical posttensioned ribbed foundation for residential construction with tendons placed in the center of the slab at approximately 48 inches on center in each direction. Reinforced and posttensioned concrete slab design software. Other design approaches for posttension slab on grade foundations rely on simplified and approximate methods which largely lead to overly conservative designs. Suspended slabs can include flat, twoway, waffle, and. The benefits of faster construction schedules while decreasing the quantity of concrete and rebar saves money. To model and design posttensioned slabongrade projects on expansive soils. We are committed to delivering uninterrupted software services worldwide during the covid19 crisis. Other design approaches for posttension slabongrade foundations rely on. Design posttensioned and conventional systems design elevated concrete slabs with or without posttensioning.
Posttensioned concrete design spreadsheet program a pdh. Posttensioned slabs use highstrength tensioned steel strands to compress the slabs, keeping the majority of the concrete in compression. This comprehensive, indepth seminar is intended for geotechnical and structural engineers and others involved in the design of posttensioned slabsonground on expansive soils. Consider all major aspects of slab design including service, ductility, and strength limit states, codeprescribed requirements, longterm deflections, punching shear, and walking vibration. Adaptsog produces effective, accurate designs with confidence. Software for the design, analysis, and investigation of prestressed concrete. Posttensioned foundations use highstrength steel to actively reinforce. Ptislab can be used to design or analyze both posttensioned and conventionally reinforced slabsonground for single and multifamily residential.
Cracking in groundsupported post tensioned slabs on. The pti design procedure is used to design a slabon grade. Posttensioning institute announces new certification programs. Top 10 biggest mistakes made in posttensioned concrete. Adaptsog software for the design of posttensioned slabs on grade foundations on expansive and compressible soils. Originally posttensioned, twoway slab framing systems were constructed with column and middle strips, similar to those used in conventionally reinforced twoway slabs. Net, which many engineers have come to trust over the years for its accuracy and flexibility.
In this article, ill be giving homeowners some necessary information about the characteristics, advantages, disadvantages, and common questionsconcerns that i receive regarding posttensioned foundations. What is the best software to design a post tension slab. Posttensioned slab on ground foundations concrete construction. Concrete slab and foundation design software safe important message. Construction maintenance of post tensioned slab on ground. 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. We specialize in analysis and design software for precastprestressed concrete in both the transportation and commercial markets.
Fundamentals of posttensioned concrete design for buildings part one. Part three continues with the study of twoway, posttensioned slab systems, including. Adaptsog differs by providing an accurate 3d finite element analysis. Soils are wetter at slab edge than at any point inside slab edge. Soil design parameters edge moisture variation distance. It was actually the widespread use of the posttensioned slab onground which induced this interest in design procedure and in many studies of reported slab failures. This spreadsheet program provides for the design and analysis of posttensioned concrete oneway beam and slab systems and twoway flat plate slab systems. Fundamentals of post tensioned design for buildings.
Need suggestions for a good pt software and design book swith examples of post tensioned slabs on grade. Design seminar descriptions posttensioning institute. In general, organic soil is too compressible for a traditional slab on grade foundation. The analysis and design of posttensioned, twoway slabs incorporate the full tributary slab width without the distribution of forces and reinforcement between column strips and middle strips, synonymous with mild reinforced two. Standard requirements for design and analysis of shallow posttensioned concrete foundations on expansive soils.
Cracking in groundsupported posttensioned slabs on expansive soils by ken bondy1 1 introduction posttensioned slabs are widely used as foundations for light residential construction in areas of expansive soils. Eriksson software precastprestressed concrete design. For a lightly loaded industrial floor, the slab is placed 4 inches thick with tendons in both directions at 2 to 5foot intervals. Posttensioned in buildings general objectives in building design applications of posttensioning in building structures the vsl hardware for use in buildings details and layouts improving the constructability preliminary sizing of posttensioned floors examples published by vsl international ltd. The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a posttensioned member. Slab on grade post tensioning systems tendon systems. The general criteria used for the design, such as details of material. Banded tendons when designing twoway, posttensioned slab systems, in addition to the code. Background information on design theories is followed by discussion of the types of slabs, soil.
The webinar covers the engineering and construction aspects of posttensioned slab on ground foundations for residential buildings that are used to resist the movement of expansive and. Khmer structural engineering design software 767 views. Safe is the ultimate tool for structural engineers designing concrete floor slabs, and foundation systems. Posttensioned foundations are designed using the posttensioning institute pti method first published in 1980 and recently updated with its 3rd edition. The pti design method incorporates slabs with exterior and interior footings ribs that extend. Ptislab can be used to design or analyze both posttensioned and. Standard requirements for design and analysis of shallow posttensioned concrete foundations on expansive and stable soils. Cables are arranged as indicated by the engineer and chaired to run through the center of the slab. However, because the continuous twoway tendons had to be placed in a draped parabolic profile near the top of. The present study focuses on posttensioned flat slab systems with respect to strength, service and cost. As a result, its best to construct a posttensioned slab, giving the slab the strength to resist stresses caused by the soil. This web seminar focuses on the design of posttensioned two way flat.
Pt designer is a computer program for the design and analysis of linear posttensioned concrete floor systems. What is the difference between normal slab and post. Preparing for concrete placement adequately brace forms check the form layout. A normal slab is basically a rcc reinforce cement concrete slab where as a post tentioned slab is the psc prestressed concret slab. We provide complete, valueengineered plan sets with specifications suitable for both estimating and construction. Post tension slab working principle, components and. Posttensioned foundation a typical posttensioned foundation with the forms set and ready for concrete. In a posttensioned slab on grade, a grid of highstrength posttensioning tendons replaces the welded wire fabric or conventional rebar normally used.
Posttensioned slabsonground provide a costefficient, highperformance. The pti design procedure is used to design a slab on grade foundation that will respond. Fundamentals of posttensioned concrete design for buildings part one a. Posttensioned, reinforced concrete slab design software ram. Chapter 9 design of posttensioned slabs onground, p. This guide presents information on the design of slabs onground, primarily industrial floors. Longer spans can be achieved due to prestress, which can also be used to counteract deflections. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen on other softwares. Posttension design specializes in designing posttensioned slabs on grade for use where the soil conditions may render conventional slabs and footings inadequate. Digital concrete scanning services construction of posttensioned slabs on grade is very similar to using reinforcing steel, except for the tensioning step. Posttensioning institute s design of posttensioned slabsonground, pti design procedure 3 rd edition.
Preventing cracks on posttensioned concrete slabs pro. The design is based on hong kong building code hkcop 2004 and its amendment of june 2007. Posttensioned slabongrade foundation 3d fem design software adaptsog product overview adaptsog is a complete threedimensional 3d finite element fem analysis and design tool for the analysis and design of posttensioned foundations slabs on expansive soils. A psc is applied with a compressive stress on the cross section in advance before the application of loading on. Download free, highquality cad drawings, blocks and details of posttensioned concrete organized by masterformat. Posttensioned slab has an advantage over others as it makes a very efficient base for floor design with thin slabs and columnless spaces in larger spans. Design and construction of posttensioned slabs on ground. Design publications and software for post tensioned slabs. The seminar will highlight the new features and changes of the recently published pti dc10. The pti design procedure is used to design a slabon grade foundation that will respond elastically to forces the foundation is exposed to including those that are the consequence of. Posttension basics how posttensioned slabs are built.
Integrated reinforced and posttensioned concrete slab design software. Design publications and software for post tensioned slabs on grade. Common design methods for these slabs assume an uncracked section, where slab. The recommendations derived from these and other studies vary from extremely light to extremely heavy. Top 10 biggest mistakes made in posttensioned concrete design. Slab on grade posttensioned slab on grade is more durable and economical than conventional slab reinforcement. It addresses the planning, design, and detailing of slabs. We recommend using pt for temperature and shrinkage reinforcement. The compressive stresses resist the anticipated tension stresses induced by the soil movements, enhancing the performance over a nonprestressed foundation. Its more user friendly compared to other pt design softwares. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen. My background is in structural steel design and construction management. The solution for soil stability challenges soil stability must be a consideration in the design and construction of any type of structure, irrespective of the region or surface appearance.
Pt slabs offer the thinnest slab type, as concrete is worked to its strengths, mostly being kept in compression. Because this course is intended to illustrate simplified analysis methods, we will use the efm exclusively. The program is developed around the robust computational core of two popular programs ptdata. Unlike other 2d diaphragmbased slab design programs, adaptfloor pros true. Fundamentals of posttensioned concrete design for buildings. Adaptsog posttensioned slabongrade foundation 3d fem. Eriksson software is an engineering software development firm located in tampa, florida. Most comprehensive design method ever developed for behavior of. Posttensioning institute education pt applications slabon.
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