Post tensioned slab on grade software pearson

Posttensioning is a method of reinforcing strengthening a concrete slab on grade with highstrength steel strands. Posttensioned prestressed concrete as a building material, concrete is strong in compression, but weak in tension. Posttensioned slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on shrinkswell soils. A normal slab is basically a rcc reinforce cement concrete slab where as a post tentioned slab is the psc prestressed concret slab.

It allows us to build slabs on expansive or soft soils. The benefits of faster construction schedules while decreasing the quantity of concrete and rebar saves money. A posttensioned slab on grade has many advantages over conventional reinforcements. Posttensioned concrete design spreadsheet program a pdh online. Typical post tensioned ribbed foundation for residential construction with tendons placed in the center of the slab at approximately 48 inches on center in each direction. This increases resistance to deflections and cracking caused by. The largest post tensioned slab on grade made by vsl without expansion joints covered the area of 30,000 square metres. Posttensioned concrete design spreadsheet program a pdh. Crosscase analysis and nvivo 11 content analysis software were used to analyze the data gathered. The posttensioned slab is thinner which reduce the construction time for clients.

Posttensioning institute education education programs. Posttensioning institutes design of posttensioned slabsonground, pti design procedure 3rd edition. Posttensioned slabs on grade beyond the build stewartperry. Ptislab can be used to design or analyze both posttensioned and conventionally reinforced slabsonground for single and multifamily residential and commercial foundations on expansive and. The post tensioned slab is thinner in comparison with the traditionally reinforced slabs and saves construction time, because smaller amounts of concrete are laid in larger areas per day, often round about 2,500 square metres. Posttensioning concrete increases the many benefits associated with a concrete framed building. Ground foundations better performance quicker to construct more economical concrete savings easy to install.

Before a post tension slab is poured, highstrength steel strands or cables, called tendons, are laid in a tight. Post tensioned slab on grade 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 post tensioned foundations slabs on expansive soils. Post tensioning concrete increases the many benefits associated with a concrete framed building. The compressive stresses resist the anticipated tension stresses induced by the soil movements, enhancing the performance over a nonprestressed foundation. Adaptsog software for the design of posttensioned slabs on grade foundations on expansive and compressible soils. Superior post tension specializes in fullservice fabrication and installation of slab on grade post tension applications. A more detailed guide to the design of pt floors can be found in the concrete societys technical report 43 tr43. Tributary slab widths for equivalent frames aalami, b. Part three continues with the study of twoway, posttensioned slab systems, including. This slab will be modeled as a 2delement, allowing the analysis to be run in a general xyz environment. Cracking in groundsupported post tensioned slabs on. Posttensioned concrete slabs augi the worlds largest. Post tensioning for twoway flat plate construction figure 2. Lots of cracks in new post tension slab inspectionnews.

Post tensioned concrete slabs on grade have become an integral part of building large cost effective and durable floor slabs. Posttensioning institute pti design manual6 gives recommended spantothickness ratios for slabs and spantodepth ratios for beams. Post tensioned concrete slabs on grade offer the building owner large areas up to 4000m2 in single pours and up to 10,000m2 in coupled jointed slabs. Design of posttensioned slabs posttensioning institute.

Post tensioning imparts an internal compressive force into the concrete. Posttensioned foundations use highstrength steel to actively reinforce residential foundations to minimize cracking and increase performance. It allows slabs and other structural members to be thinner. Focus will be on posttensioning design and analysis, and construction considerations.

The parametric study of the post tensioned flat slab by varying the span by 0. This sliding requires that the slab have a smooth flat bottom. Posttensioning and reinforced concrete structural analysis. Slab on grade post tensioned concrete slabs on grade have become an integral part of building large cost effective and durable floor slabs. Two broad categories of cracking can occur in groundsupported posttensioned slabs. Cracking in groundsupported post tensioned slabs on expansive. Several methods exist for prestressing concrete, with post tensioning being a very common one. A practical approach, 3e is the only canadian textbook which covers the design of reinforced concrete structural members in accordance with the csa standard a23. Post tension concrete slab in this example post tensioned cables are introduced on a concrete slab. 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.

Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen. When a concrete floor slab is subjected to forces, it flexes and bends. Concrete slab design software economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. It is also important to mark the slab as posttensioned so care can be taken when drilling through or demolishing the slab.

Reinforcement helps extend the life of concrete, overcoming cracking that is inherent in the material and preventing its failure. With capabilities to support residential projects from design through construction, spt provides national home and apartment builders, as well as custom home professionals, with the best protection for their new construction investments. Post tensioning institutes design of posttensioned slabs onground, pti design procedure 3rd edition. 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. When planning for point loads, a safe rule of thumb is to figure on 1,000 pounds per inch of slab thickness. Originally post tensioned, twoway slab framing systems were constructed with column and middle strips, similar to those used in conventionally reinforced twoway slabs. The parametric study of the posttensioned flat slab by varying the span by 0. The benefits of faster construction schedules while decreasing the quantity of concrete and rebar saves money posttensioning imparts an internal compressive force into the concrete. Economically design post tensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. The joints are very minimum depends on the area of the slab, this reduces the costly dowels using and cracking problem.

Post tensioned foundations are designed using the post tensioning institute pti method first published in 1980 and recently updated with its 3rd edition. This web seminar focuses on the design of posttensioned two way flat. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc. The advantages are many, when compared to non posttensioned systems, and include thinner slabs, lighter structures, lower floortofloor heights, less. Brendon burley structural option post tensioned twoway slab load analysis when considering twoway slabs in a post tensioned system, it is important to perform an advanced analysis of the loads and their effects at different locations in the building. 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. Twoway posttensioned design amsysco post tensioning. By the third day, i noticed a crack in the back patio, and by the fourth, there were sprawling cracks throughout the entire foundation. Salunke mgms college of engineering and technology, kamothe, india mgms college of engineering and technology, kamothe, india abstract the use of posttensioned flat slab is increasing day by day, due to its advantages over traditional concrete. Ccl posttensioned slab systems can be integrated into any type of slab, including flat, ribbed or waffle slabs, which may include drop caps, drop panels or. This project presents elements and foundation for development of a. Post tensioned slab on grade is more durable and economical than conventional slab reinforcement. Some foundations used for light buildings on shrinkswell soils.

Posttensioned slab on grade is more durable and economical than conventional slab reinforcement. Before a posttension slab is poured, highstrength steel strands or cables, called tendons, are laid in a tight grid. For example, precast posttensioned supported bent caps with an inverted t section with spans. Market for post tensioning tendons over 40% of all pt tendons sold in the usa are for residential foundations. Post tensioning, which is a form of prestressing, has several advantages over standard reinforcing steel rebars. Posttensioned, belowgrade concrete foundation system. This article provides information on how to scheme a pt slab and how the use of post tensioning affects the rest of the structure.

For example, precast posttensioned supported bent caps with an inverted tsection with spans. This spreadsheet program provides for the design and analysis of posttensioned concrete oneway beam and slab systems and twoway flat plate slab systems. Posttension concrete slab in this example posttensioned cables are introduced on a concrete slab. General overview of posttensioned concrete design instructor. The purpose of this publication is to widen the understanding of posttensioned floor construction and show the considerable benefits which include minimum storey heights, rapid construction, economy, maximum design flexibility, minimum number of columns, optimum clear spans, jointfree, crackfree. Improved inspection techniques for steel prestressingpost.

This spreadsheet program provides for the design and analysis of post tensioned concrete oneway beam and slab systems and twoway flat plate slab systems. Cracks caused by applied loads flexural or shear cracks. Aalami, editor for professionals engaged in posttensioning design issue 6 august 1995 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. Stiffened slab on grade elevated structural slab on piers stiffened slab on grade and on piers thin post tensioned slab figure 1.

Design fundamentals of posttensioned concrete slabs bommer, allan, aalami, bijan on. It is known that the prestressed half pc precast slab system has. Ptislab can be used to design or analyze both posttensioned and conventionally reinforced slabsonground for single and multifamily residential and. Rapt is a two dimensional post tension beamslab design software. Fundamentals of posttensioned concrete design for buildings part one.

This is part one of a threepart course that covers the fundamentals of post tensioned concrete design for building structures using unbonded tendons. This tension makes the concrete slab and foundation much stronger than concrete without reinforcement and helps reduce cracking. What is the difference between normal slab and posttensioned. Market for posttensioning tendons over 40% of all pt tendons sold in the usa are for residential foundations. Tendon profile of a continuous post tensioned beam. The pti design procedure is used to design a slab on grade foundation that will respond elastically to forces the foundation is exposed to including those that are the consequence of soil pressure and soil deformation. These forces are a result of gravity pulling down on the slab while additional weight is applied to the top of the slab. To obtain maximum benefit from ccl post tensioned slabs it is recommended that they are incorporated. A practical approach, 2e is the only canadian textbook which covers the design of reinforced concrete structural members in accordance with the csa standard a23. Standard requirements for design and analysis of shallow posttensioned concrete foundations on expansive soils. Post tensioning is a method of reinforcing strengthening a concrete slab on grade with highstrength steel strands. The garage floor slab could be formed as a posttensioned slab on grade to resist the expansive soil forces.

Brendon burley structural option posttensioned twoway slab load analysis when considering twoway slabs in a posttensioned system, it is important to perform an advanced analysis of the loads and their effects at different locations in the building. Posttensioned slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on. Hightension steel tendons enable slab foundations to withstand the stresses of. Optimization of twoway posttensioned concrete floor systems. Post tensioned pt concrete floors are now widely used in the uk, particularly for highrise buildings. Chapter 15 covers the slab on grade industry, which represents more sales of posttensioning tendons than all other posttensioning. It reduces or eliminates shrinkage crackingtherefore no joints, or fewer joints, are needed. Twoway slab systems twoway post tensioned slab systems have been widely used in building construction for many decades. The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a post tensioned member. We will group the cables and space them throughout a slab, just as we would an elevated slab. Posttensioned, reinforced concrete slab design software ram. Posttensioned slabs on grade beyond the build stewart.

Design fundamentals of posttensioned concrete slabs. A post tensioned slab on grade has many advantages over conventional reinforcements. Cracks caused by the restraint to axial slab shortening rts cracks. Twoway posttensioned slab systems have been widely used in building construction for many decades. Comparative analysis of castinplace posttensioned and steel.

A posttension slab is a slab of concrete that has been prestressed using a specific method to increase the strength of the concrete. Several methods exist for prestressing concrete, with posttensioning being a very common one. Shrinkage crack considerations for posttensioned foundations june 1, 2015 shrinkage cracks in concrete slabonground foundations are a significant public relations problem to home builders. After the concrete is poured, but before it permanently sets, the tendons are tightened to apply compression on the slab. What is the difference between normal slab and post.

Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. The lack of joints reduces the ongoing maintenance. Design floors and foundations reliably and efficiently, saving time and money, and overcoming the most common concerns you face as a designer. The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a posttensioned member. Analysis of posttensioned flat slab by using safe shriraj s. This will then reduce the tension stresses due to soil movement of subgrade, thus.

These categories of cracks are caused by entirely different phenomena and have very different characteristics. Cover is determined from the requirements for corrosion protection, fire protection, and wear. Grade the lot for positive drainage away from the foundation during and afterconstruction. In the last twenty five years the post tensioned slab has become more and more popular. Post tensioned concrete is a variant of prestressed concrete where the tendons are tensioned after the surrounding concrete structure has been cast 25 the tendons are not placed in direct contact with the concrete, but are encapsulated within a protective sleeve or duct which is either cast into the concrete structure or placed adjacent to it. Posttensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons. A psc is applied with a compressive stress on the cross section in advance before the application of loading on. Jim rogers posttensioned floors increasingly are being used in highrise construction. Its more user friendly compared to other pt design softwares. All concrete will shrink during the curing process which lasts up to a.

Construction maintenance of post tensioned slab on ground. Preparing for concrete placement adequately brace forms check the form layout. Some of the cracks are more than 30 feet long, and i can feel a slight difference in the rise on each side you can even. Regression analysis was performed assuming pearsoniii curve. Course content this spreadsheet program provides for the design and analysis of posttensioned concrete oneway beam and slab systems and twoway flat plate slab systems. Slabongrade and posttensioned slab software adaptsog. Slab on grade post tensioning systems tendon systems.

For general design philosophy and analysis of posttensioned concrete, the reader should refer to pdhonline course s127. What is the best software to design a post tension slab. Therefore, in addition to the ability to span further, the. Development of the design approach the primary design issues for stiffened slabs on grade are the sizing of the beams that stiffened the slab and the. Posttensioned, belowgrade concrete foundation system berkey.

Given the significant weight of automobiles that are normally parked in an attached garage, the floor of the garage is generally a concrete slab poured on grade. But you need to design the beam slab one by one time consuming adapt floorpro. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen on other softwares. Posttensioned concrete is a variant of prestressed concrete where the tendons are tensioned after the surrounding concrete structure has been cast 25 the tendons are not placed in direct contact with the concrete, but are encapsulated within a protective sleeve or duct which is either cast into the concrete structure or placed adjacent to it. These strands or cables are also referred to as tendons. This is a windowsbased software for the design, analysis and load rating of multispan. Inserting tendons in the concrete is a very tedious and timeconsuming procedure, even if we do it just as 2d annotation. Combined half precast concrete slab and posttensioned slab.

The professional development series is a unique opportunity to earn continuing education credit by reading specially focused, sponsored articles in structural engineer. A 5inch post tensioned slab can handle up to 5,000 pounds, and a typical 9inchthick slab will bear a concentrated 9,000pound load. The advantages are many, when compared to non post tensioned systems, and include thinner slabs, lighter structures, lower floortofloor heights, less mild reinforcing steel, and less short and long term deflections. A 5inch posttensioned slab can handle up to 5,000 pounds, and a typical 9inchthick slab will bear a concentrated 9,000pound load. In order to take into account longterm losses, the user would estimate these losses and simply include. Posttensioned slab on ground foundations concrete construction. 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 soil pressure and soil deformation. As we all know, autodesk revit doesnt provide posttensioned concrete modeling. The purpose of this publication is to widen the understanding of post tensioned floor construction and show the considerable benefits which include minimum storey heights, rapid construction, economy, maximum design flexibility, minimum number of columns, optimum clear spans, jointfree, crackfree.