Rapt is a two dimensional post tension beam slab design software. Posttensioning concrete increases the many benefits associated with a concrete framed building. This report presents the structural engineering calculations of a posttensioned floor using parallel beams and oneway slab construction. The programs name, captain, is an acronym for c omputer a ided p ost t ensioning analysis in strument. Once the slab cures, qualified personnel apply tension and grout the cables. Cast in place concrete vs post tension slab construction. 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 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 slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on. Neglecting to design general anchorage zones or delegating this responsibility.
Design and detailing of prestressed concrete beams and slabs. Adaptsog posttensioned slabongrade foundation 3d fem. Cables are arranged as indicated by the engineer and chaired to run through the center of the slab. This web seminar focuses on the design of posttensioned two way flat. 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. A posttensioned foundation is a concrete slab foundation that is reinforced with stranded steel cables that are tensioned after the concrete hardens. Design and analysis of slab on ground foundations on both expansive and compressible soils.
Posttensioning and prestressed design and software. 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. Adaptsog software for the design of posttensioned slabs on grade foundations on expansive and compressible soils. In the succeeding years numerous posttensioned slabs were designed and constructed in. Posttensioned slab design manual otte group software. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen. Concrete slab design software economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. For residential construction, tendons at 48 inches on center are common.
Design and construction of posttensioned slabs on ground. The webinar covers the engineering and construction aspects of posttensioned slab on ground foundations for residential buildings that are. Post tensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons. Longer spans can be achieved due to prestress, which can also be used to counteract deflections. Top 10 biggest mistakes made in posttensioned concrete. 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. Prestress has a favourable influence, balancing a part of the. Concrete water tanks are often posttensioned to reduce crack width and leakage. 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. Originally posttensioned, twoway slab framing systems were constructed with column and middle strips, similar to those used in conventionally reinforced twoway slabs. 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. Pdf analysis and design of rcc and posttensioned flat. Design publications and software for post tensioned slabs on grade. Posttensioning for twoway flat plate construction figure 2.
Foundation post tension raft foundation tensioned foundations vsl post tensioning post tension slab on grade, design of post tensioned slabs and foundations pdf fip. Slabonground posttensioned slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on shrinkswell soils. The foundation includes a posttensioned concrete floor slab formed on the soil base of a below grade excavation. Tributary slab widths for equivalent frames aalami, b. Slabongrade and posttensioned slab software adaptsog. The general criteria used for the design, such as details of material. Post tensioned foundation information for the homeowner. Posttension basics how posttensioned slabs are built. Posttensioned concrete design spreadsheet program a pdh. Ptislab can be used to design or analyze both posttensioned and conventionally reinforced slabsonground for single and multifamily residential and. The stranded cables are slid inside of plasticsheathing, which prevents the stranded steel tendons from touching the concrete. A normal slab is basically a rcc reinforce cement concrete slab where as a post tentioned slab is the psc prestressed concret slab. Post tension slab design software structural engineering.
On screen warning messages for out of compliance conditions. Need suggestions for a good pt software and design bookswith examples of post tensioned slabs on grade. For general design philosophy and analysis of posttensioned concrete, the reader should refer to pdhonline course s127. Posttensioned slabs are usually used for long spans andor high live loads where the control of deflections assumes a significant role. When the foundationconcrete has sufficiently hardenedcured, the. 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. Figures 49 through 411, and 415 show configurations with insulation on the exterior surface of the foundation. Its difficult to core holes or cut future openings in posttensioned slabs. Posttensioned foundations are designed using the posttensioning institute pti method first published in 1980 and recently updated with its 3rd edition. However, because the continuous twoway tendons had to be placed in a draped parabolic profile near the top of. A psc is applied with a compressive stress on the cross section in advance before the application of loading on.
Economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility. Post tensioned slab technical specificaitons post tensioning of the slabs will be carried out in accordance with. Although some posttensioned slab structures had been constructed in europe quite early on, the real development took place in the usa and australia. The post tensioning bonded flat slab system shall consist of high tensile strands of 12. Adaptsog produces effective, accurate designs with confidence. Market for posttensioning tendons over 40% of all pt tendons sold in the usa are for residential foundations. Calculation and analysis of uniform thickness slabs, sometimes referred to as california flat slabs. Figures 412 through 414 show variations where the slab is the primary location for insulation. Standard requirements for design and analysis of shallow posttensioned concrete foundations on expansive soils. 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. Posttensioned pt slabs are typically flat slabs, band beam and slabs or ribbed slabs.
Adaptsog differs by providing an accurate 3d finite element analysis. A below grade, posttensioned concrete foundation system for use in the construction of residential dwellings and other structures is described. Posttensioning institutes design of posttensioned slabsonground, pti design procedure 3rd edition. The parametric study of the posttensioned flat slab by varying the span by 0. We specialize in analysis and design software for precastprestressed concrete in both the transportation and commercial markets. Posttensioned slab on grade is more durable and economical than conventional slab reinforcement. Design of post tensioned slabs on ground 3rd edition. 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. In this section several typical slabongrade sections are illustrated and described. The design is based on hong kong building code hkcop 2004 and its amendment of june 2007. 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. Posttensioned slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on shrinkswell soils.
Post tension slab design software sethguthrie civilenvironmental 18 aug 16 19. We recommend using pt for temperature and shrinkage reinforcement. The use of posttensioned solutions in building design presents, in many cases, important technical and economical advantages. Below grade applications are structures like parking garages that.
Many theoretical analyses show that no lessening of the requirements is. One interesting application is for a concrete countertop that needed to span 6 feet and carry a heavy load. Posttension cables are steel wires inserted into plastic sheathing laid in place while pouring the concrete slab. Posttensioned, reinforced concrete slab design software ram. Contractors sometimes need to drill or cut into a posttensioned slab. Slab on grade post tensioning systems tendon systems. What is the difference between normal slab and post. 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. Construction of posttensioned slabs on grade is very similar to using reinforcing steel, except for the tensioning step. Our future vision pti envisions a future in which post tensioning is the first choice for reinforcing all structures. My background is in structural steel design and construction management. Members of the institute include major posttensioning material fabricators in the u. The compressive stresses resist the anticipated tension stresses induced by the soil movements, enhancing the performance over a nonprestressed foundation.
Other design approaches for posttension slabongrade foundations rely on simplified and approximate methods which largely lead to overly conservative designs. The benefits of faster construction schedules while decreasing the quantity of concrete and rebar saves money posttensioning imparts an. 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. Eriksson software precastprestressed concrete design.
Concrete foundation walls are formed on the perimeter of the posttensioned floor slab. The recommendations derived from these and other studies vary from extremely light to extremely heavy. Design floors and foundations reliably and efficiently, saving time and money, and overcoming the most common concerns you face as a designer. Instantly download a sample cad collection search for drawings browse s of 2d cad drawings, specifications, brochures, and more. Posttensioned concrete has been used in building construction since the late. This book is destined to become the definitive work on the design of posttensioned concrete buildings for many decades to come. Design posttensioned and conventional concrete floors design elevated concrete slabs with or without posttensioning. What is the best software to design a post tension slab. Design and construction of posttensioned slabs on ground using.
Generally speaking the perception is that a post tensioned sport court is more expensive than a cast in place 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. Us20030233798a1 posttensioned, belowgrade concrete. 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. Design publications and software for post tensioned slabs. Geotechnical evaluation of the design of posttensioned slabs on expansive soils using the pti third edition procedure for arizona conditions march 2006 doi. Eriksson software is an engineering software development firm located in tampa, florida. Homeowners are getting crushed by flawed posttension.
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