Ram concept allows you to easily design complex floor geometries and incorporate changes with ease using powerful task automation and clearly. When we have finished modeling the slab itself, we duplicate the plan view do not use duplicate with detailing. Detail sheets providing information on primary uses, sizes, and features can be accessed for each of the following gti posttensioning accessories by clicking below. Posttensioned twoway slab pennsylvania state university. Corrosion protection system for bonded posttension tendons the posttech pti impregnation system is specifically engineered to mitigate corrosion in bonded posttension tendons. Post tension slabs are a form of prestressed slabs which means they are compressed prior to use so that the slabs are able to bear weight or service loads beyond their own natural weight. Part three continues with the study of twoway, posttensioned slab systems, including. Sathyanarayana10631a0147 civil engineering 4th year sri venkateswara engineering college internal guide. Post tensioned slabs dedicated to project controls. Posttensioned concrete slabs in buildings have many advantages over reinforced concrete slabs and other structural systems for both single and multilevel structures. An installation, stressing and post construction activities such as making a. Author zstructures posted on may 25, 2014 format video categories structures tags concrete, post tension slab, pt slabs, technology. Prestress concrete unbonded posttensioning youtube.
This slab will be modeled as a 2delement, allowing the analysis to be run in a general xyz environment. This means the foundation is reinforced by cables laid in a grid arrangement and tensioned after the concrete cures sufficiently with the intent to create compression in the foundation concrete to resist cracking. Pt design for slabs of complex geometry, in which design strip. Post tension slab design software sethguthrie civilenvironmental 18 aug 16 19.
Formwork may now be struck and adjacent bay poured. Brendon burley structural option posttensioned twoway slab posttension investigation besides shear strength it is also important to consider the moment capacity of each of the sections. There are a wide variety of reasons for utilizing post tension slabs versus conventional slabs. One thought on slab post tensioning explained animation. Reinforced and posttensioned concrete slab design software. Installed correctly post tension cables have proven to be stronger and more reliable in high stress situations while reducing overall materials and construction time. Structural calculations for posttensioned beam and one. But you need to design the beam slab one by one time consuming. Although some posttensioned slab structures had been constructed in europe quite early on, the real development. It allows slabs and other structural members to be thinner. Design floors and foundations reliably and efficiently, saving time and money, and overcoming the most common concerns you face as a designer.
The builder used a posttension foundation with footings. Cables are arranged as indicate by the engineer and chaired to run from side to side the center of the slab. Slovenia, and sweden for reinforced and posttensioned concrete design using eurocode 22004. Discussion about post tension concrete foundations. Project on design and construction of post tensioning slab presenting by. This way we have one view for the mild steel reinforcement and another for the posttension tendons. Before a posttension slab is poured, highstrength steel strands or cables, called tendons, are laid in a tight grid.
Slabs in posttensioned concrete, 19802 floors 42 or 48 roofs 48 or 52 concrete society technical report n25 posttensioned flatslab design handbook, 19843 light. Design and software expertise in posttensioning and prestressed concrete for over 30 years, adapt corporation has provided a full range of software products and engineering servi. Placement involves picking a placement point and an orientation point. Posttensioned, reinforced concrete slab design software ram. Figures 49 through 411, and 415 show configurations with insulation on the exterior surface of the foundation. Once the slab cures, qualified personnel apply tension and grout the cables. The foundation in question was a posttension cable reinforced foundation as opposed to a foundation which is reinforced with steel rebar see the typical photograph in this article. Pt anchor pocket formerthis series of components provides some basic posttensioning tools. Adaptrc is for the analysis andor design of reinforced concrete beams, slabs and floor systems.
Tendons today are seven highstrength steel wires wound together and placed inside a plastic duct. Tension stress as multiple of fcu12 at top fibers 0. A psc is applied with a compressive stress on the cross section in advance before the application of loading on. Fundamentals of posttensioned concrete design for buildings. General overview of posttensioned concrete design instructor. After 48 hrs concrete is stressed to initial strength 15 kn takes 1 day. Prestressed concrete post tension slabs fundamentals.
Construction of posttensioned slabs on grade is much related to using reinforcing steel, apart from the tensioning step. A combination of these values will determine the slab stresses at the time of stressing and at service loads. Post tension slabs answers to questions buyers ask. Segment as in2 bars spacing in interior column strip top bot 12. This web seminar focuses on the design of posttensioned two way flat. An analysis of the bulk cross section of each segment of slab is summarized in table 22. In order to take into account longterm losses, the user would estimate these losses and simply include. The contract work to be performed under this section consists of furnishing all required labor, materials, equipment, implements, parts and supplies necessary for, or appurtenant to, the. Post tension slab design software structural engineering.
Same approach can be used but taking care to have similar arc discretization for both beam and cables, using those nodes to connect with rigid links between them. Hello all, i would certainly appreciate some advice on a problem im facing. What is posttensioning introduction posttensioning is a method of producing prestressed concrete, masonry and other structural elements. Posttensioned concrete design spreadsheet program a pdh. Primary use of these components are for creating drawing details. Figures 412 through 414 show variations where the slab is the primary location for insulation. Post tensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons. A post tension slab is a concrete slab or foundation that contains high tension cables running through the concrete to increase strength and reduce cracking typically in areas with poor soil conditions. The placement of the post tensioning cables can take place at the same time as.
Its more user friendly compared to other pt design softwares. Several methods exist for prestressing concrete, with posttensioning being a very common one. Post tension slab working principle, components and. In this section several typical slabongrade sections are illustrated and described. Contractors sometimes need to drill or cut into a posttensioned slab for repair or renovation work. A residential posttensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. Fundamentals of posttensioned concrete design for buildings part one. The cables are pulled to 33,000 pounds, resulting in 8 inches of elongation in a 100foot cable. Usually a sign in the garage or stamp in the slab will indicate if your home has a post tension slab. An animation movie which illustrates almost all the activities related to mono strand unbonded post tensioning system. Our future vision pti envisions a future in which post tensioning is the first choice for reinforcing all structures.
Fundamentals of posttensioned concrete design for buildings part one a suncam online continuing education course. Rapt is a two dimensional post tension beamslab design software. For post tensioned slabs you just need to allow a couple of days for post tensioning after the slab is cast. Structural calculations for posttensioned beam and oneway slab construction. Twoway posttensioned design amsysco post tensioning. This overlay will show up while the video is playing. Posttension concrete slab in this example posttensioned cables are introduced on a concrete slab. Prestressed concrete post tension slabs fundamentals udemy. A posttension slab is a slab of concrete that has been prestressed using a specific method to increase the strength of the concrete. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen on other softwares.
Posttension cables are steel wires inserted into plastic sheathing laid in place while pouring the concrete slab. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by pti, the tendons are stressed. Recent enhancements safe computers and structures, inc. To get the excel sheet join as loving fansub member to this channel. And from what ive seen the cost of conventional vs post tension is about a wash. I suppose this is not unusual, based on other posts ive read. Safe provides useful image and animationcapture tools for additional graphics. Posttensioning, which is a form of prestressing, has several advantages over standard reinforcing steel rebars.
Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen. Click the start animation button in the lower righthand corner of the display to animate. We produced this 3d visualisation demonstrating how ccls posttensioning systems provides a range of benefits for their customers. 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 posttensioned member. Post tension slab is a combination of conventional slab reinforcement and additional protruding highstrength steel tendons, which are consequently subjected to tension after the concrete has set. Do you say you dont know anything, or can you give them a short explanation about them and why more and more builders are using them. This will occur once the slab has reached a prerequisite e. Safe is a software tailored for the engineering of elevated floor and. A properly designed post tension slab can design around expansive soils, high water tables, etc. Hi, it is the pretension added in the opposite direction. Economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality.
Posttensioned slab design manual otte group software. Conventional uses more steel less concrete, post tension uses more concrete less steel at least on all of my designed slabs in east texas where expansive soil is. This is accomplished by prestressing cables which run throughout the slab and by compressing the concrete. The computer program safe and all associated documentation are proprietary and. Construction maintenance of post tensioned slab on ground. Post tensioning is a technique for reinforcing concrete. Standard requirements for design and analysis of shallow posttensioned concrete foundations on expansive soils. An easytouse and learn software for the design, analysis, and investigation of reinforced nonprestressed concrete beams, beam frames, slabs and floor systems a must have production tool in every structural engineering office. For example a post tension concrete slab of 400mm can carry load equivalent to the general concrete slab of mm. Posttensioned concrete slabs augi the worlds largest. A normal slab is basically a rcc reinforce cement concrete slab where as a post tentioned slab is the psc prestressed concret slab. This hybridisation helps achieve the formation of a much thinner slab with a longer span devoid of any columnfree spaces.
Adapt corporation specializes in structural concrete design software for post tensioning, reinforced concrete, and prestressed beam, slab, foundation. Posttension basics how posttensioned slabs are built. What is the best software to design a post tension slab. Whether you choose a posttension or rebar slab nortex has the experience and expertise to design a foundation suitable for all your construction and design needs.
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