Posttensioning institutes design of posttensioned slabsonground, pti design procedure 3rd edition. Fanning, nonlinear models of r einforced and post tensioned concrete beams, ele ctronic journal of structural engineering, vol. Posttensioned slab applicabilty jae structural nov 07 18. Beam and shell modelling of a posttensioned bridge using. A 4node bilinear shell element cps4r for concrete and. In posttensioning process the ducts are first laid in the form of the actual deflection pattern of the beam profile and the casting of the beam is done first. Structural engineers select appropriate beams for example hollow.
Less concrete and steel are needed for the same structural capacity and the slab stiffness is. Their deflection can be controlled by varying the amount of post. The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a posttensioned member. After the concrete is matured high yield high tensile steel wires as tendons are then inserted through the ducts and the posttensioned forces are applied equally through both ends of. A proto type model developed to define the post tensioning technique. Advantages of using posttensioning for your next slabonground project. Post tensioning for twoway flat plate construction figure 2. In order to build and analysis a fe model for posttensioned concrete beam, the generalpurpose fe software abaqus was used. Posttensioned and reinforced concrete slab and beam design. Adaptpt 2012 posttensioned slab and beam design software. Neglecting to design general anchorage zones or delegating this responsibility. Structural calculations for posttensioned beam and oneway slab construction. Strands are at the top of the beam over the support and near the bottom at mid span. Longer spans can be achieved due to prestress, which can also be used to counteract deflections.
The use of posttensioned solutions in building design presents, in many cases, important technical and economical advantages. Structural systems in posttensioned concrete a band beam and slab for rectangular grids the band beam and slab solution may be appropriate. Structural calculations for posttensioned beam and. Sensitivity analysis of cable profile of prestressed concrete. In simple span beams the primary posttensioning pt moments induced by the prestressing force are directly proportional to the eccentricity of the tendons with respect to the neutral axis. Covers the building of a simple model of a 3span slab bridge with twin deep ribs, using shell and beam elements and constraint equations to tie the surfaces and beams. There are two methods for prestressing pretensioning and posttensioning. Apr 01, 2016 covers the building of a simple model of a 3span slab bridge with twin deep ribs, using shell and beam elements and constraint equations to tie the surfaces and beams together to ensure composite.
The user has full flexibility in defining the number of the cables and their shape. A 4node bilinear shell element cps4r for concrete and strengthening members such as deviator and pin, a 2node linear 2d truss element t2d2 for internal reinforcements, and a 2node linear beam element b21. The tensile face indicates what portion of the beam requires reinforcing for strength. This spreadsheet program provides for the design and analysis of post tensioned concrete oneway beam and slab systems and twoway flat plate slab systems. Tendon losses along the beam can be plotted for each tendon. Adaptpt is a software for the analysis and design of posttensioned floor. Learn the workings of the commercially available software. Fundamentals of posttensioned concrete design for buildings part one. The rapt computer package is a design and analysis tool for reinforced and posttensioned concrete slab and beam systems, developed by prestressed concrete design consultants. The program enables the user to define and design post tensioned concrete beams. Modelling of bonded posttensioned concrete cantilever beams. Numerical analyses ansys package program is used for analysis of beams. It seems to me that the real elephant on the beam in deflection calculations is the effect of. The compressive stresses resist the anticipated tension stresses induced by the soil movements, enhancing the performance over a nonprestressed foundation.
Effect of prestressing force, cable profile and eccentricity. Adaptptrc 2016 slab and beam software for reinforced and. Posttensioned and reinforced concrete slab and beam. Posttensioned, reinforced concrete slab design software ram. The reinforcing bars were welded to the beams flange or web at both ends and tensioned using a manual screw jack to increase the loadcarrying capacity and stiffness of the beam. Selection of technical notes and articles on post tensioning to view or download. Sensitivity analysis of cable profile of prestressed. The program enables the user to define and design posttensioned concrete beams and slabs for any strap model. In continuous or indeterminate post tensioned structures the moments due to the prestressing.
Slabonground post tensioned slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on shrinkswell soils. Adaptpt and rc software for the efficient design of posttensioned and mild. The variation of flexural rigidity for post tensioned prestressed concrete beams taheng wang 1, ran huang1, and tzwei wang 2 key words. Finiteelement analysis of posttensioned sglaminated.
Posttensioned slab applicabilty gcfreem structural op. Abstract the natural frequency of axialloaded concrete beam decreases with increasing applied compressive force, and the. Eriksson software precastprestressed concrete design and. The tendons change their vertical location in the beam to follow the tensile moment diagram. Adaptpt is advanced posttensioning software for beam frames, slabs and. Tributary slab widths for equivalent frames aalami, b. General overview of post tensioned concrete design. Posttensioned concrete design spreadsheet program a pdh.
In order to build and analysis a fe model for post tensioned concrete beam, the generalpurpose fe software abaqus was used. It illustrates the use of posttensioned tendons, and the performance of an ultimate limit state analysis. Developed 3dfe modelling is suitable for identifying the effect of different design features on the response of post. Course content this spreadsheet program provides for the design and analysis of post tensioned concrete oneway beam and slab systems and twoway flat plate slab systems. Reinforced concrete vs prestressed concrete skyciv cloud. Top 10 biggest mistakes made in posttensioned concrete.
There are two methods for prestressing pretensioning and post tensioning. Rapt is a computer package for computers running microsoft windows operating system which, given the basic. To meet the design requirements, a low value for posttensioning had to be specified. Posttensioned and reinforced concrete slab and beam design software adaptptrc product overview since 1981, adapt softwares proven reliability and easeofuse have made it the most widely used software for the design of posttensioned slabs and beams worldwide. For beams, the program calculates the exact deflections. We recommend using pt for temperature and shrinkage reinforcement. The use of post tensioned solutions in building design presents, in many cases, important technical and economical advantages. Concrete slab design software economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency. In this paper, a threedimensional nonlinear finite element fe method is used to determine the behaviour of. Adaptpt posttensioned slab and beam design software an indispensable production tool for your posttensioned concrete projects. Subsequently, any tension on the concrete transfers readily to the tendons. Used in cip posttensioned or conventionally reinforced concrete box girders, slabs, traffic and pedestrian barriers, approach slabs, footings, box culverts, wing walls, curtain walls, retaining. Post tensioning provides economic design and construction for concrete slabs through characteristics such as. Used in cip post tensioned or conventionally reinforced concrete box girders, slabs, traffic and pedestrian barriers, approach slabs, footings, box culverts, wing walls, curtain walls, retaining walls, columns, and crossbeams.
Prestress has a favourable influence, balancing a part of the. F3 factor to account for service stress in tensile reinforcement. Adaptpt 2012 is the latest version of our highly efficient, reliable, fast, and easytouse software for the analysis, design, and investigation of elevated posttensioned concrete beams, joists, oneway, twoway and slab band systems with and without drop panels. Pre tensioned concrete elements are common in floor slabs, beams, and lintels. It illustrates the use of post tensioned tendons, and the performance of an ultimate limit state analysis uls with cracking.
Tendon profile of a continuous post tensioned beam. Manual analysis and design of posttensioned t beam bridge girder. Post tensioned and reinforced concrete slab and beam design software adaptptrc product overview since 1981, adapt software s proven reliability and easeofuse have made it the most widely used software for the design of post tensioned slabs and beams worldwide. This spreadsheet program provides for the design and analysis of posttensioned concrete oneway beam and slab systems and twoway flat plate slab systems. Posttensioned slabs are usually used for long spans. Multispan beams can be defined with precast or castinplace cross sections. Modelling of bonded posttensioned concrete cantilever. Pt slabs offer the thinnest slab type, as concrete is worked to its strengths, mostly being kept in compression. The beam is loaded by dead weight, by post tensioning and by distributed permanent and live loads from the girders.
Increasing popularity the growth in the use of ccl posttensioned slabs. Economically design post tensioned and reinforced concrete floors including slabs, mats, and rafts. Comparison of reinforced and posttensioned transfer. Farr engineers can provide full design and documentation of posttensioned and pre stressed structures from preliminary designs to complete shop detailed tendon. Designers of posttensioned beam and slab parking structures, in particular, find adaptpt rc to be the best suited solution for their type of projects. Posttensioning for twoway flat plate construction figure 2. The general criteria used for the design, such as details of material. While simple and intuitive, it requires the computation of hyperstatic secondary moments a somewhat unfamiliar concept for many engineers.
Abaqus modeling for posttensioned reinforced concrete beams. In total, seven beams were upgraded and tested under threepoint bending, using different configurations of reinforcing steel. Fundamentals of posttensioned concrete design for buildings. Finite element analysis of reinforced and pretensioned. The rapt analysis and design package for reinforced and posttensioned concrete.
This report presents the structural engineering calculations of a posttensioned floor using parallel beams and oneway slab construction. Fanning, nonlinear models of r einforced and posttensioned concrete beams, ele ctronic journal of structural engineering, vol. Economically design post tensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. The user has full flexibility in defining the number of. Economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. Compression by static friction transfers the tension to the concrete once it is released.
Comparison of reinforced and posttensioned transfer beams. Engineers who do not routinely design posttensioning tend to pass the design to those specialized in the field. 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. Posttensioned beam design to aashto lrfd 7 this release includes a new beam design module which allows posttensioned beams to be designed to aashto lrfd 7th. For general design philosophy and analysis of post tensioned concrete, the reader should refer to pdhonline course s127. Pt slabs offer the thinnest slab type, as concrete is worked to its. Reinforced beamed beam download full software, game. When moment is drawn on the tension side, the diagram matches the general drape of the tendons. This example deals with a posttensioned concrete beam on three supports fig. Autodesk structural bridge design 2018 civil engineering. The flexural performance of a posttensioned, bonded, prestressed, reinforced, concrete beam with 500 mpa steel bars was studied by du kara et al.
The reinforcing bars were welded to the beam s flange or web at both ends and tensioned using a manual screw jack to increase the loadcarrying capacity and stiffness of the beam. You cannot calculate pt slab or beam deflections based on either average moments or long term deflection. In this paper, a threedimensional nonlinear finite element fe method is used to determine the behaviour of post tensioned pt concrete cantilever beams with different tendon profiles. Structural calculations for posttensioned beam and oneway. Posttensioned slabs are usually used for long spans andor high live loads where the control of deflections assumes a significant role. Their deflection can be controlled by varying the amount of posttensioning to balance any portion of applied. Design floors and foundations reliably and efficiently, saving time and money, and overcoming the most common concerns you face as a designer. Posttensioned pt slabs are typically flat slabs, band beam and slabs or ribbed slabs. Selection of technical notes and articles on posttensioning to view or download.
Post tension slab design software calvinandhobbes10 structural 26 aug 16 15. Bending characteristics of a posttensioned, prestressed. Program execution proceeds interactively, progressing through the design. Developed 3dfe modelling is suitable for identifying the effect of different design features on the response of post tensioned concrete beam. The design is based on hong kong building code hkcop 2004 and its amendment of june 2007. The rapt computer package is a design and analysis tool for reinforced and post tensioned concrete slab and beam systems, developed by prestressed concrete design consultants. Posttensioned and reinforced concrete slab and beam design software adaptptrc product overview since 1981, adapt softwares proven reliability and easeofuse have made it the. Posttensioned slab applicabilty concrete engineering. Posttensioned buildings design and construction us and international editions. 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.
Jun 04, 2019 most posttensioned concrete buildings are designed using the loadbalancing method. The pti design procedure is used to design a slabon grade foundation that. Post tension slab design software post tension slab design software mck26 structural. Allowance for cracking in deflection calculation of beams and oneway slab. Post tension slab design software structural engineering. The typical crosssection of the examined laminated glass beams with posttensioned, mechanically anchored tendons is shown in fig. Post tensioned slab applicabilty hokie66 structural 1 dec 07 00. Manual analysis and design of post tensioned t beam bridge girder. T beams for buildings from load tables provided by the vendor. Comparison of reinforced and post tensioned transfer beams with an emphasis on their design economy prepared by dren s. Structural calculations for posttensioned beam and one.
This is part one of a threepart course that covers the fundamentals of post tensioned concrete design for building structures using unbonded tendons. Posttensioned buildings design and construction post. Comparison of reinforced and posttensioned transfer beams with an emphasis on their design economy prepared by dren s. To examine the effectiveness use of post tensioning in bridge sub structures. This example deals with a post tensioned concrete beam on three supports fig. Pdf finite element analysis of reinforced and pretensioned. The program enables the user to define and design post tensioned concrete beams and slabs for any strap model. Site location is assumed to be near socorro, new mexico, with the bridge crossing a waterway on a normal perpendicular. Eriksson software is an engineering software development firm located in tampa, florida. Abaqus modeling for posttensioned reinforced concrete. Prestress has a favourable influence, balancing a part of the imp9sed verticalloads, but, on the other hand, itallows for more slender slabs, which are more sensitive to deflections. Post tensioned slabs are usually used for long spans andor high live loads where the control of deflections assumes a significant role. In simple span beams the primary post tensioning pt moments induced by the prestressing force are directly proportional to the eccentricity of the tendons with respect to the neutral axis of the member i. We specialize in analysis and design software for precastprestressed.
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