Post tensioning tensioned concrete offers a wide range of post tensioning solutions from mono strand systems typically used in house slabs where the ground is highly reactive, slab systems 12. Chapters 28 are the notes dirk bondy uses to teach design of prestressed concrete structures at ucla and cal polysan luis obispo. Ultimate behaviour and design of posttensioned composite. Chapter 1 tells the history of posttensioned concrete as only ken bondy can tell it. Limitations on slab dimensions and required material quantities are presented and discussed. While inspection is not a cureall, it goes a long way in eliminating jobsite problems and assuring quality construction. Post tension cables are steel wires inserted into plastic sheathing laid in place while pouring the concrete slab. Post tension slab stepbystep process 7 authenticity with 3d software finite element for design and drawings. Posttensioned concrete is used more frequently today than in the past, and presents several hazards to firefighters. Posttensioned, reinforced concrete slab design software ram. Post tensioning concrete increases the many benefits associated with a concrete framed building. Structural engineers design concrete slabs with posttension cables to obtain greater span lengths between supporting columns and to allow thinner slabs. General overview of post tensioned concrete design. The owner can frequently save money when post tensioning is properly used.
This article provides information on how to scheme a pt slab and how the use of post tensioning affects the rest of the structure. Pt designer is a computer program for the design and analysis of linear post tensioned concrete floor systems. This is part one of a threepart course that covers the fundamentals of post tensioned concrete design for building structures using unbonded tendons. Nov 25, 2008 post tensioned concrete is a term heard more and more in the construction industry today. Pdf fundamentals of posttensioned concrete design for. It was found that a certain amount of poor design was prevalent, and the. Jan 01, 2014 post tensioned buildings design and construction bijan o. Net, which many engineers have come to trust over the years for its accuracy and flexibility. Fundamentals of posttensioned concrete design for buildings part one fundamentals of posttensioned concrete design for buildings part one. Ccl carries out complete designs for posttensioned concrete applications. Posttension basics how posttensioned slabs are built. Pdf finite element modeling of posttensioned twoway. More information on post tensioning, including example case studies, can be found at the post tensioning association pta website at.
Downloads pta the post tensioning associationpta the post. Structural engineers design concrete slabs with post tension cables to obtain greater span lengths between supporting columns and to allow thinner slabs. Organic matter, such as grass, roots and leaves, will decay under the slab, causing the foundation to settle and crack. A residential post tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. Chapters 9 are design examples that address many of the decisions faced by practicing engineers on typical projects. Ram concept contains an advanced feature set that allows for the design of a wide variety of floor systems including post tensioned, reinforced concrete and hybrid systems, elevated slabs and matraft foundations, oneway slabs, twoway slabs, beams, and joist systems. Post tensioned concrete design table 11 list of symbols used in the aci 31808 code m bal design moment resistance of a section with tendons and the necessary mild reinforcement to reach the balanced condition, nmm m u factored moment at section, lbin n c tension force in concrete due to unfactored dead load plus live load, lb p. The analytical model of the bridge consists only of beam elements superstructure and columns. Cypecads post tensioned concrete slabs for buildings module has been designed to carry out the design of the passive reinforcement of post tensioned slabs, using the forces that have been obtained from analysing the post tensioned tendons bonded or unbonded, whose properties have been introduced by the program users. This is part three of a threepart course that covers the fundamentals of posttensioned concrete for building structures using unbonded tendons. This structural solution is commonly used in concrete construction where the posttensioned composite slab spans between reinforced or prestressed band beams, as illustrated in fig. An overview is presented on the application and design of such floor systems, and the commonly selected castinplace floor system configurations are described. Our future vision pti envisions a future in which post tensioning is the first choice for reinforcing all structures.
A combination of these values will determine the slab stresses at the time of stressing and at service loads. Post tensioning also results in lesser reinforceme. The software is extremely easy to use and is intended for both occasional and regular designers of post tensioned concrete floor systems. This guidance note is intended for engineers engaged in the design. Jan 24, 2015 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. For general design philosophy and analysis of post tensioned concrete, the reader should refer to pdhonline course s127. Pdf analysis and design of rcc and posttensioned flat slabs. Post tensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons. Posttensioned buildings design and construction bijan o. The potential advantages of this structural system based on strength. This tutorial deals with a simple 2span post tensioned concrete beam bridge.
The concrete centre provides material, design and construction guidance. Pdf posttensioned pt method is a widely used technique to. Post tension slab design software sethguthrie civilenvironmental 18 aug 16 19. 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. Pt designer design of posttensioned concrete floors. 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. Design floors and foundations reliably and efficiently, saving time and money, and overcoming the most common concerns you face as a designer.
This is part three of a threepart course that covers the fundamentals of post tensioned concrete for building structures using unbonded tendons. Pdf post tensioned concrete design for aci 31808 contents. Jul 15, 2016 posttensioned slab procedure duration. This book is destined to become the definitive work on the design of post tensioned concrete buildings for many decades to come. The owner can frequently save money when posttensioning is properly used. This article provides information on how to scheme a pt slab and how the use of posttensioning affects the rest of the structure. To get the excel sheet join as loving fansub member to this channel. As soon as the concrete has achieved strength to 2000 psi, usually within the 3 to 10 days suggested by pti, the tendons are stressed. 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. Preventing cracks on posttensioned concrete slabs pro.
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, mostly being kept in compression. Slabonground design by using the pti ken bondy method. Mechanisms marine as prestress to post tensioned concrete handbook pdf free edge spans. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by pti, the tendons are stressed. Experience and expertise gained from working on projects. Pti 3 structural material types structural steel prestressed concrete reinforced concrete pre. Post tension slab video post tension concrete slab. Posttensioning tensioned concrete offers a wide range of posttensioning solutions from mono strand systems typically used in house slabs where the ground is highly reactive, slab systems 12. Durability aspects of present pt systems, key design concepts, code requirements, and practical design and construction tips will also be discussed. Tendons today are seven highstrength steel wires wound together and placed inside a plastic duct.
Fundamentals of posttensioned concrete design for buildings. Post tension slab design software structural engineering. In california, posttensioned floor slabs are the primary choice in concrete floor construction. Post tensioned pt concrete floors are now widely used in the uk, particularly for highrise buildings. The following table of prestress losses is recommended for the design of post tensioned members, and does not include friction or wedge set losses. Slab onground design by using the pti ken bondy method. In our case we are interested only in the beam results for further design of. 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. The program is developed around the robust computational core of two popular programs ptdata. Service stress analysis, ultimate moment strength and ultimate beam. A more detailed guide to the design of pt floors can be found in the concrete societys technical report 43 tr43. Organic soil is a type of soil that contains a high percentage of organic matter. Posttensioned composite floors consist of concrete slabs poured on thinwalled profiled sheeting and prestressed soon after the casting. Posttensioned pt slabs are typically flat slabs, band beam and slabs or ribbed slabs.
The software is extremely easy to use and is intended for both occasional and regular designers of posttensioned concrete floor systems. That hampers efforts to properly posttensioned the slab once the concrete is poured. Rapt is a two dimensional post tension beamslab design software. Posttensioning and prestressed design and software expertise for. Posttensioned pt concrete floors are now widely used in the uk, particularly for highrise buildings. Chapter 1 tells the history of post tensioned concrete as only ken bondy can tell it. Pt slabs have lesser thickness than rcc slabs as their deflection can be controlled by post tensioning. Posttension basics how posttensioned slabs are built the.
Post tensioned slab design, supply, install tensioned concrete. 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. Gregory havel takes a look at this aspect of modern building construction. Many theoretical analyses show that no lessening of the requirements is. This course is intended to be an introductory course for structural engineers new to post tensioned concrete design, and is a good refresher for experienced structural engineers.
Tensioned bonded strands bonded tendons unbonded tendons internal internal external. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen. Ram concept is a software application for the structural analysis and design of conventionally reinforced and posttensioned concrete floors, mats, and rafts. Pdf new methods in efficient posttensioned slab design using. Longer spans can be achieved due to prestress, which can also be used to counteract deflections.
Post tensioned concrete design for aci 31808 contents. Posttensioned concrete design spreadsheet program a pdh. An introduction to specifying post tensioned slabs, an article extracted from concrete quarterly, spring 2020. Our future vision pti envisions a future in which posttensioning is the first choice for reinforcing all structures.
For general design philosophy and analysis of posttensioned concrete, the reader should refer to pdhonline course s127. A 2 2area 2 a c 2 2 posttensioned 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 tensioned slabs are used when spans are large and normal rcc slabs become uneconomical. Net is a windowsbased computer program for the design and analysis of linear post tensioned concrete frames. Want to design concrete floors economically, with exceptional visibility into compliance, and efficiency while designing slabs, mats, and rafts. Once the slab cures, qualified personnel apply tension and grout the cables. Sep 09, 2016 course study on post tension slab design. Whatever the posttensioning requirement tensioned concrete has the.
Jul 21, 2017 rapt is a two dimensional post tension beam slab design software. 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. Posttensioning concrete increases the many benefits associated with a concrete framed building. Top 10 biggest mistakes made in posttensioned concrete. Post tension slab advantages and disadvantages of post. Ram concept contains an advanced feature set that allows for the design of a wide variety of floor systems including posttensioned, reinforced concrete and hybrid systems, elevated slabs and mat.
Concrete slab design software economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. Design seminar descriptions posttensioning institute. Post tensioned slab design, supply, install tensioned. Download free, highquality cad drawings, blocks and details of posttensioned concrete organized by masterformat. Twoway posttensioned design amsysco post tensioning.
Adaptpt designs posttensioned slabs and beam frames using equivalent frame method. Tensioning building structures march 12, 2020 2020 educode las vegas. Its more user friendly compared to other pt design softwares. Posttensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons. Posttensioned slab design guide post tension slab problems. 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 posttensioned technology has different degrees of acceptance in. What is the best software to design a post tension slab. 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. Pdf posttensioned concrete longspan slabs in projects. An introduction to pt designer design of posttensioned concrete. Post tensioned concrete beam bridge sofistik tutorials 2020.
Posttension cables are steel wires inserted into plastic sheathing laid in place while pouring the concrete slab. This course is intended to be an introductory course for structural engineers new to posttensioned concrete design, and is a good refresher for experienced structural engineers. Part three continues with the study of twoway, posttensioned slab systems, including a complete design example using the equivalent frame concept. This method of reinforcing concrete enables a designer to take advantage of the considerable benefits provided by prestressed concrete while retaining the flexibility afforded by the castinplace method of building concrete structures. This book is destined to become the definitive work on the design of posttensioned concrete buildings for. Efficiency is especially apparent in multispan applications. Pdf posttensioned concrete longspan slabs in projects of. The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a posttensioned member. For general design philosophy and analysis of posttensioned concrete, the reader.
Presentations will focus on design, analysis, and construction of post tensioned buildings and will include handson training on the design and analysis of new post tensioned building structures. Economically design post tensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. Powered by slabs to post concrete floors design handbook pdf. Equivalent frame structural concrete design software 2d design.
Net is a windowsbased computer program for the design and analysis of linear posttensioned concrete frames. 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. A residential posttensioned concrete slab is usually 8 inches thick and applies 3000 psi concrete. This spreadsheet program provides for the design and analysis of post tensioned concrete oneway beam and slab systems and twoway flat plate slab systems. The quantities of reinforcing steel, prestressing steel, concrete required for the slab, beam and column is calculated for the same and are presented in tabular form.
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