The rise of elevated, posttensioned concrete slab systems as our communities infill and become more dense, more multilevel structures will be introduced. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Wallace, stresses in unbonded tendons of posttensioned flat plate systems under dynamic excitation. A research on comparison of rcc and post tensioned flat slab. It provides an architect the freedom to work freely with his designs. Indications are given concerning preliminary design and indirect control of deflections in posttensioned flat slabs. The institution of structural engineers 2,003 views. This course provides the documentation to enable the use of a posttension design spreadsheet program for oneway concrete beam and slab and twoway. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc. Design method may not be used for twoway, post tensioned slab systems. Integrated reinforced and posttensioned concrete slab design software adaptfloor pro product overview with its ability to model full multistory concrete buildings, floor pro delivers value beyond other singlelevel slab design programs. Cost effectiveness of posttensioned and reinforced concrete flat. Deflecuon limits prestressing in posttensioned slabs fundamentally influences the behaviour of the structure under service loads. Pdf analysis and design of rcc and posttensioned flat.
Design methods such as bandeddistributed flat slabs rely on yield line solutions even though designers treat it as a normal flexural design. Twoway posttensioned design amsysco post tensioning. Post tension slab design software structural engineering. The execution of the design will be explained with reference. Design floors and foundations reliably and efficiently, saving time and money, and overcoming the most common concerns you face as a designer. Hi all, can anyone recommend a good design software for post tension slab on grade slab. Longer spans can be achieved due to prestress, which can also be used to counteract deflections. The analysis and design follow the equivalent frame analysis method of the aci code, which considers a onebay wide strip of the floor system as a continuous frame. Analysis of posttensioned flat slab by using safe shriraj s. What is the difference between normal slab and post.
The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a post tensioned. This web seminar will focus on the design of post tensioned two way flat slabs that can be used for a multitude of building applications ranging from parking, hotel, office and podium type structures. Design floors and foundations reliably and efficiently, saving time and money, and overcoming the most. 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. Commercial opportunities ccl post tensioning results in thinner concrete slabs. Khmer structural engineering design software 767 views. 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. Tributary slab widths for equivalent frames aalami, b. Unbonded post tensioned flat slab civildigital civil engineering articles concrete flat slab floors for construction efficiency advantages to client unbonded post tensioned flat slab 0. Post tension slab advantages and disadvantages of post. Models can have columns, braces, walls, and ramps connected from the floors above and below.
Pt slab design software slab on grade pt slab design software slab on grade kb2016 structural op 17 aug 16 14. Suspended slabs can include flat, twoway, waffle, and ribbed framing systems. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Twoway posttensioned flat slab design in adapt builder 2018. By simplifying slab reinforcement at column locations and eliminating column capitals, stirrup cages, or i beam shear heads, they enable efficient design and rapid.
Other applications of fixed section elements include structures such as water tanks and post tensioned slabs onground. We partner with developers and architects that run the gamut in terms of experience from seasoned post tensioned concrete podium slab. A 2 2area 2 a c 2 2 post tensioned concrete design table 11 list of symbols used in the aci 31808 code cp area enclosed by the outside perimeter of the section, in a g gross area of concrete, in a 2 l total area of longitudinal reinforcement to resist torsion, in a o area enclosed by the shear flow path, sqin a oh area enclosed by the centerline of the outermost closed. Post tensioning may be included in both slabs and beams to balance a percentage of the selfweight. Use of post tensioned flat slab is now a day becoming cost effective solution for. Aug 30, 2017 this spreadsheet program provides for the design and analysis of post tensioned concrete oneway beam and slab systems and twoway flat plate slab systems. Post tension design of slab there is document post tension design of slab available here for reading and downloading. Neglecting to design general anchorage zones or delegating this responsibility. Twoway pt slab design tutorial with adaptfloor pro session 1. Part three continues with the study of twoway, post tensioned slab systems, including.
What is the best software to design a post tension slab. Comparative study of post tensioned and rcc flat slab in. Top 10 biggest mistakes made in posttensioned concrete. Slabongrade and posttensioned slab software adaptsog. Another popular system is oneway slab and beam floor systems that are castinplace, figs.
Csis safe software is used in the design of an 87story mixeduse. Threedimensional 3d finite element software for the integrated analysis and design of concrete and posttensioned floor and foundation systems. Structural engineers design concrete slabs with post tension cables to obtain greater span lengths between supporting columns and to allow thinner slabs. Post tensioning will reduce cracking and keep any cracks that might. As a standalone program, it analyzes and designs individual floor levels one at a time. The file extension pdf and ranks to the documents category.
Flat slab analysis and design designs beamless concrete slab floors flat slab or waffle slab in accordance with aci 318. Pt designer is a computer program for the design and analysis of linear post tensioned concrete floor systems. Fundamentals of post tensioned design for buildings. The design of post tensioned flat slab can be done by using load balancing and equivalent. Rapt is a two dimensional post tension beam slab design software. Calculation and the theory by which the software works are attached with this software s index, this thing is not seen. Pdf analysis and design of rcc and posttensioned flat slabs. Posttensioning and prestressed design and software expertise for. And it requires a lot of redistribution to make it work. A detailed explanation will be given of the checksto be carried out, the aspects to be considered in the design and the construction procedures and sequences of a post tensioned slab. Advantages of using post tensioning for your next slab onground project.
Tendon profile of a continuous post tensioned beam. Posttensioned pt slabs are typically flat slabs, band beam and slabs or ribbed slabs. Pdf experimental and numerical assessment of bonded and. Analysis and design of rcc and posttensioned flat slabs. The following table of prestress losses is recommended for the design of post tensioned members, and does not include friction or wedge set losses. Posttensioned concrete design spreadsheet program a pdh. Now that you know the benefits of building with a post tensioned concrete podium, you may want to know how to go about. Adaptfloor pro analyzes and designs pt or rc floor systems and beam frames using 3d. Finally, an example of a flat slab floor system is presented to illustrate the practice. Slab onground design by using the pti ken bondy method. Design of post tensioned flat slab structures in ram concept. The design of post tensioned slab is done by using load balancing and equivalent frame method.
Posttensioned concrete slabs augi the worlds largest. Fundamentals of posttensioned concrete design for buildings part one. Design posttensioned and conventional systems design elevated concrete slabs with or without posttensioning. Stronger, more efficient floor slab design creates longer spans and reduces the need for columns within the structure. Everything you need to know about building with concrete. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen on other softwares. Experimental and numerical assessment of bonded and unbonded posttensioned concrete members.
The results indicate that post tensioned flat slabs are cheaper than the rcc slab. Post tension cables are steel wires inserted into plastic sheathing laid in place while pouring the concrete slab. The design of posttensioned flat slab can be done by using load balancing and equivalent frame. This spreadsheet program provides for the design and analysis of posttensioned concrete oneway beam and slab systems and twoway flat plate slab systems. Inserting tendons in the concrete is a very tedious and timeconsuming procedure, even if we do it just as 2d annotation. It was actually the widespread use of the posttensioned slabonground which induced this interest in design procedure and in many studies of reported slab failures.
Fundamentals of posttensioned concrete design for buildings. It was found that a certain amount of poor design was prevalent, and the. This spreadsheet program provides for the design and analysis of post tensioned concrete oneway beam and slab systems and twoway flat plate slab systems. 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. Download free, highquality cad drawings, blocks and details of post tensioned concrete organized by masterformat. Post tensioned slabs are becoming a larger part of the design and construction mix here. Economically design post tensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. Posttensioned, reinforced concrete slab design software ram. Whether the project is local or overseas, design codes from around the globe are available for reinforced concrete and post tensioned slab design. Flat plate and flat slab floor systems are ideally suited for the use of post tensioning tendons, figs. By doing the comparative analysis and design of posttensioned flat slab with a conventional slab, we can show how beneficial will be the. This latest and largest phase of the development features four post tensioned concrete frames up to ten storeys high.
The rise of elevated, posttensioned concrete slab systems. Lafave, recommendations for design of post tensioned slab column connections subjected to lateral loading. Banded tendons when designing twoway, post tensioned slab systems, in addition to the code. This book is destined to become the definitive work on the design of post tensioned concrete buildings for many decades to come. Salunke mgms college of engineering and technology, kamothe, india mgms college of engineering and technology, kamothe, india abstract the use of post tensioned flat slab is increasing day by day, due to its advantages over traditional concrete. Jul 21, 2017 rapt is a two dimensional post tension beam slab design software. The recommendations derived from these and other studies vary from extremely light to extremely heavy. Post tension slab although concrete is a strong material for construction, it is not resistant to breakdown especially where longer concrete slabs are required like in a bridge or a length of a beam. A psc is applied with a compressive stress on the cross section in advance before the application of loading on. Guidelines for the design of posttensioned floors by bijan o. Twoway post tensioned flat slab design in adapt builder 2018. Sep 09, 2016 course study on post tension slab design.
Posttensioning institute education publications pti. Because this course is intended to illustrate simplified analysis methods, we will use the efm exclusively. The largest block, f north, contains transfer structures at ground and second floor level, but otherwise is a 220mm deep, 2way post tensioned flat slab. Learn about the etabs building analysis and design program.
Written by structural engineers who design post tensioned concrete buildings for a living and teach how to design them at the university level, there has simply never been anything like this book. Use the download button below or simple online reader. Adaptsog designs pt slabongrade foundations for expansive or compressible soils. What should the proportion 2 way post tensioned slab structural engineering general discussion engtips. Originally posttensioned, twoway slab framing systems were constructed with column and middle strips, similar to those used in conventionally reinforced twoway slabs.
Pt designer design of posttensioned concrete floors. Post tensioned 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. Pt slabs offer the thinnest slab type, as concrete is worked to its strengths, mostly being kept in compression. Its more user friendly compared to other pt design softwares. Consider all major aspects of slab design including service, ductility, and strength limit states, codeprescribed requirements, longterm deflections, punching shear, and walking vibration. Economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. For this, the concrete slab is tensioned with a process called prestressing and the slab of concrete which comes out after this process is known.
Flat slab analysis and design free version download for pc. The program is developed around the robust computational core of two popular programs ptdata. Rebar reinforcement in this case is technically allowed by code but in our experience, a properly designed posttensioned concrete slab will minimize cracking due to shrinkage. Design of post tensioned flat slab structures in ram.
The example presented here is for twoway posttensioned design. General overview of posttensioned concrete design instructor. Less concrete and steel are needed for the same structural capacity and the slab stiffness is increased so that the slab is better able to resist bending caused by differential soil movements. Jurgens his article presents a set of guidelines intended to t assist designers in routine post tensioning design, beginning with a discussion of the initial decisions that must be made to design post tensioned. This webinar will present a stepbystep tutorial for the design of a singlelevel twoway posttensioned slab in adaptfloors fem platform. Fundamentals of posttensioned concrete design for buildings part one a suncam online continuing education course. Post tensioning concrete increases the many benefits associated with a concrete framed building. Posttensioning may be included in both slabs and beams to balance a percentage of the selfweight. Lafave, recommendations for design of posttensioned slabcolumn connections subjected to lateral loading. As we all know, autodesk revit doesnt provide posttensioned concrete modeling. Software for posttensioned or prestressed structures. The behaviour and response of flat slab and post tensioned flat slab during earthquake is an important aspect which needs to be explored.
Post tension slab working principle, components and. Choice of distributions and scheme of the tendons in the flat slab system differ according to the designer vision and experience. Originally post tensioned, twoway slab framing systems were constructed with column and. The model considered is basement, ground and 4 floors with dimensions 38. 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. Post tensioned slabs use highstrength tensioned steel strands to compress the slabs, keeping the majority of the concrete in compression. While using this method more precautions has to be made for shear and deflection criteria for the slabs. Pt slabs posttensioned concrete slabstress bermondsey spa. Post tensioning for twoway flat plate construction figure 2. Sep 10, 2016 post tension slab design in etabs 2016 decode bd. Wallace, stresses in unbonded tendons of post tensioned flat plate systems under dynamic excitation. A normal slab is basically a rcc reinforce cement concrete slab where as a post tentioned slab is the psc prestressed concret slab. 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. By doing the comparative analysis and design of post tensioned flat slab with a conventional slab, we can show how beneficial will be the process of making pt flat slab than other slabs.
We recommend using pt for temperature and shrinkage reinforcement. Overview safe is the ultimate tool for designing concrete floor and foundation systems. Pt designer is a computer program for the design and analysis of linear posttensioned concrete floor systems. Pt slabs offer the thinnest slab type, as concrete is worked to its strengths. 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. Reinforced and posttensioned concrete slab design software.
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