Slabongrade and posttensioned slab software adaptsog. The parametric study of the posttensioned flat slab by varying the span by 0. Posttensioning and prestressed design and software. The webinar covers the engineering and construction aspects of posttensioned slab on ground foundations for residential buildings that are used to resist the movement of expansive and. The compressive stresses resist the anticipated tension stresses induced by the soil movements, enhancing the performance over a nonprestressed foundation. Design of post tensioned slabs on ground 3rd edition. 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. Posttensioned slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on shrinkswell soils. Concrete water tanks are often posttensioned to reduce crack width and leakage. Homeowners are getting crushed by flawed posttension. We recommend using pt for temperature and shrinkage reinforcement.
Pt slabs offer the thinnest slab type, as concrete is worked to its strengths, mostly being kept in compression. The post tensioning bonded flat slab system shall consist of high tensile strands of 12. Foundation post tension raft foundation tensioned foundations vsl post tensioning post tension slab on grade, design of post tensioned slabs and foundations pdf fip. The stranded cables are slid inside of plasticsheathing, which prevents the stranded steel tendons from touching the concrete. A below grade, posttensioned concrete foundation system for use in the construction of residential dwellings and other structures is described. The use of posttensioned solutions in building design presents, in many cases, important technical and economical advantages. Posttensioned slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on.
Once the slab cures, qualified personnel apply tension and grout the cables. Below grade applications are structures like parking garages that. Neglecting to design general anchorage zones or delegating this responsibility. Its difficult to core holes or cut future openings in posttensioned slabs. Post tensioned slab technical specificaitons post tensioning of the slabs will be carried out in accordance with. Design publications and software for post tensioned slabs. Posttensioned foundations are designed using the posttensioning institute pti method first published in 1980 and recently updated with its 3rd edition. The recommendations derived from these and other studies vary from extremely light to extremely heavy. Design and analysis of slab on ground foundations on both expansive and compressible soils. Posttensioned slab on grade is more durable and economical than conventional slab reinforcement. Post tension slab design software structural engineering. Longer spans can be achieved due to prestress, which can also be used to counteract deflections. Rapt is a two dimensional post tension beam slab design software. Contractors sometimes need to drill or cut into a posttensioned slab.
Posttensioning for twoway flat plate construction figure 2. Construction of posttensioned slabs on grade is very similar to using reinforcing steel, except for the tensioning step. My background is in structural steel design and construction management. Posttensioned pt slabs are typically flat slabs, band beam and slabs or ribbed slabs. Design publications and software for post tensioned slabs on grade. What is the difference between normal slab and post. Top 10 biggest mistakes made in posttensioned concrete. 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. Figures 412 through 414 show variations where the slab is the primary location for insulation. Concrete foundation walls are formed on the perimeter of the posttensioned floor slab. Its workings is similar to that of continuous beamslab design, but it adds additional design features such as complex sections such as bridge decks, and userspecified. In the succeeding years numerous posttensioned slabs were designed and constructed in. A typical draped profile in an elevated concrete slab would route the posttensioned reinforcing through a high point over the slabs supports, and through a. Figures 49 through 411, and 415 show configurations with insulation on the exterior surface of the foundation.
When the foundationconcrete has sufficiently hardenedcured, the. Posttensioned, reinforced concrete slab design software ram. Economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility. Design and construction of posttensioned slabs on ground. Adaptsog posttensioned slabongrade foundation 3d fem. Posttensioned concrete has been used in building construction since the late. Posttensioned slab design manual otte group software.
This report presents the structural engineering calculations of a posttensioned floor using parallel beams and oneway slab construction. Instantly download a sample cad collection search for drawings browse s of 2d cad drawings, specifications, brochures, and more. Adaptsog differs by providing an accurate 3d finite element analysis. Design and detailing of prestressed concrete beams and slabs. Posttensioning concrete increases the many benefits associated with a concrete framed building. Posttension cables are steel wires inserted into plastic sheathing laid in place while pouring the concrete slab. In this section several typical slabongrade sections are illustrated and described. Many houston area structural engineers feel that the inherently weaker residential posttensioned slab are at risk from two major factors first, the nonuniform weight distribution of the house puts great stress on the slab foundation. Posttension basics how posttensioned slabs are built. Slab on grade post tensioning systems tendon systems.
Adaptsog software for the design of posttensioned slabs on grade foundations on expansive and compressible soils. Tributary slab widths for equivalent frames aalami, b. 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. Originally posttensioned, twoway slab framing systems were constructed with column and middle strips, similar to those used in conventionally reinforced twoway slabs. It was actually the widespread use of the post tensioned slab onground which induced this interest in design procedure and in many studies of reported slab failures.
Post tensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons. Posttensioned slabs are usually used for long spans andor high live loads where the control of deflections assumes a significant role. Typical posttensioned ribbed foundation for residential construction with tendons placed in the center of the slab at approximately 48 inches on center in each direction. On screen warning messages for out of compliance conditions. The webinar covers the engineering and construction aspects of posttensioned slab on ground foundations for residential buildings that are. Design floors and foundations reliably and efficiently, saving time and money, and overcoming the most common concerns you face as a designer. Cables are arranged as indicated by the engineer and chaired to run through the center of the slab. For residential construction, tendons at 48 inches on center are common.
A posttensioned foundation is a concrete slab foundation that is reinforced with stranded steel cables that are tensioned after the concrete hardens. Design and construction of posttensioned slabs on ground using. Its more user friendly compared to other pt design softwares. Ptislab can be used to design or analyze both posttensioned and conventionally reinforced slabsonground for single and multifamily residential and. Slabonground posttensioned slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on shrinkswell soils. Masonry walls can be posttensionedthis is usually done with a solid steel bar fastened to the foundation and stressed with a nut at the walls top.
Adaptsog produces effective, accurate designs with confidence. This web seminar focuses on the design of posttensioned two way flat. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen. However, because the continuous twoway tendons had to be placed in a draped parabolic profile near the top of. Need suggestions for a good pt software and design bookswith examples of post tensioned slabs on grade. Design posttensioned and conventional concrete floors design elevated concrete slabs with or without posttensioning. Eriksson software precastprestressed concrete design.
Concrete slab design software economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. Second, the nonuniform thickness of fill soil under the foundation can be a major contributing factor in damaged slab foundations. The design is based on hong kong building code hkcop 2004 and its amendment of june 2007. What is the best software to design a post tension slab. One interesting application is for a concrete countertop that needed to span 6 feet and carry a heavy load. Calculation and analysis of uniform thickness slabs, sometimes referred to as california flat slabs. Posttensioned concrete design spreadsheet program a pdh. 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. 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. Analysis of a slab s capacity to support on interior line load or concentrated point load.
The foundation includes a posttensioned concrete floor slab formed on the soil base of a below grade excavation. 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 services for the modeling, analysis and design of prestressed pre or posttensioned concrete structures. Many theoretical analyses show that no lessening of the requirements is. Post tension slab design software sethguthrie civilenvironmental 18 aug 16 19. The benefits of faster construction schedules while decreasing the quantity of concrete and rebar saves money posttensioning imparts an. Us20030233798a1 posttensioned, belowgrade concrete. Prestress has a favourable influence, balancing a part of the. A psc is applied with a compressive stress on the cross section in advance before the application of loading on. Cast in place concrete vs post tension slab construction. Geotechnical evaluation of the design of posttensioned slabs on expansive soils using the pti third edition procedure for arizona conditions march 2006 doi. Pdf analysis and design of rcc and posttensioned flat. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen on other softwares.
Post tensioned foundation information for the homeowner. Standard requirements for design and analysis of shallow posttensioned concrete foundations on expansive soils. 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. Our future vision pti envisions a future in which post tensioning is the first choice for reinforcing all structures. A normal slab is basically a rcc reinforce cement concrete slab where as a post tentioned slab is the psc prestressed concret slab. Eriksson software is an engineering software development firm located in tampa, florida. We specialize in analysis and design software for precastprestressed concrete in both the transportation and commercial markets. The general criteria used for the design, such as details of material. Market for posttensioning tendons over 40% of all pt tendons sold in the usa are for residential foundations. Consider all major aspects of slab design, including service, ductility, and strength limit states, punching shear requirements, longterm deflections, and walking vibration.
Although some posttensioned slab structures had been constructed in europe quite early on, the real development took place in the usa and australia. The programs name, captain, is an acronym for c omputer a ided p ost t ensioning analysis in strument. Other design approaches for posttension slabongrade foundations rely on simplified and approximate methods which largely lead to overly conservative designs. Generally speaking the perception is that a post tensioned sport court is more expensive than a cast in place slab. Members of the institute include major posttensioning material fabricators in the u. Rapt is a two dimensional post tension beamslab design software.
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