Posttensioning and prestressed design and software. Consider all major aspects of slab design including service, ductility, and strength limit states, codeprescribed requirements, longterm deflections, punching shear, and walking vibration. A residential post tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. Post tensioned slabs are becoming a larger part of the design and construction mix here. Posttensioned slabsonground provide a costefficient, highperformance solution for problems associated with groundsupported residential foundations on shrinkswell soils. Post tensioning is done at a project site and requires little to no modifications of the same forming system that would be used to construct nonprestressed concrete.
We are dedicated to providing the construction industry with engineering expertise, responsive service and manufacturing excellence to ensure safe, timely and cost effective installations, restorations and repairs. Software for posttensioned or prestressed structures adaptbuilder structural concrete design suite 3d fem design adaptedge analyzes complete concrete buildings for gravity and lateral loads. 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. Jul 21, 2017 rapt is a two dimensional post tension beamslab design software.
Economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. Demolition of post tensioned concrete structures presents the contractor with unique issues. What is the best software to design a post tension slab. Posttensioned foundation a typical posttensioned foundation with the forms set and ready for concrete. Adapt corporation specializes in structural concrete design software for posttensioning, reinforced concrete, and prestressed beam, slab, foundation. The systems used to post tension concrete and masonry consist of prestressing steel that is housed inside a duct or sheath, which allows. Our future vision pti envisions a future in which posttensioning is the first choice for reinforcing all structures. Post tension slab design software structural engineering. Cables are arranged as indicated by the engineer and chaired to run through the center of the slab. Posttensioned concrete means that the concrete is poured and then the tension is appliedbut it is still stressed before the loads are applied so it is still prestressed. Its more user friendly compared to other pt design softwares. There is currently debate on how best to assess post tensioned concrete in terms of early age strength measurement and also how best to optimise mix designs for constructional applications. Reinforced concrete and partially prestressed concrete members to various design codes.
While concrete is strong in compression, it is weak in tension. Structural calculations for posttensioned beam and oneway. Prestressing post tensioned concrete software design. Post tensioned foundation information for the homeowner. Prestress posttensioning in lusas is suitable for beams, slabs and. Post tensioned concrete is accomplished by tension ing high strength steel cables within the concrete mass. Top 10 biggest mistakes made in posttensioned concrete. Posttensioning and prestressed design and software expertise. This method is achieved in a process where metal or plastic tubes which contain loose tensioning cables or rods are cast into the concrete.
Our innovative approach and extensive experience dealing with concrete and steel strand tensioning systems allows us to provide our customers with excellent pt concrete engineering results. Ram concept is a software application for the structural analysis and design of conventionally reinforced and post tensioned concrete floors, mats, and rafts. Eriksson software precastprestressed concrete design. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. Use the tabs in the component dialog box to load a previously saved pt post tensioning tendon reinforcement that represents reinforcing bars, strands, or wires that are used to produce a compressive stress in prestressed concrete besides the actual reinforcing bars. Pt designer, our latest post tensioned design software for more. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by pti, the tendons are stressed. Software pt designer is a computer program for the design and analysis of linear post tensioned concrete floor systems. We specialize in analysis and design software for precastprestressed concrete in both the transportation and commercial markets. In addition, post tensioning requires tendons, which are steel wires, bars or strands with a higher tensile strength than conventional reinforcement. Our future vision pti envisions a future in which post tensioning is the first choice for reinforcing all structures. If you want the latest theory get gilbert and ranzis book on long term effects in concrete. The rise of elevated, posttensioned concrete slab systems as our communities infill and become more dense, more multilevel structures will be introduced.
Highstrength steel tendons are positioned in ducts or sleeves before the concrete is placed. The design of general anchorage zones is critical to the integrity of any posttensioned concrete structure and we recommend that the ldp complete this task personally. New zealands leading provider of concrete post tensioning solutions. Over tensioning, bad prepration design layingcuring of concrete, bad structural design, bad load estimation and temperature, right. Posten engineering systems provides the tools you need to design your structures efficiently, quickly and correctly. Design posttensioned and conventional systems design elevated concrete slabs with or without posttensioning. Post tension cables pt cables are drawn tight with thousands of pounds of pressure.
The program enables the user to define and design posttensioned concrete beams and slabs for any strap model. Halfen hsdld lockable dowels have been designed for use in temporary movement joints, most commonly found in post tension concrete slabs. Post tensioning can help create innovative concrete components that are thinner, longer, and stronger than ever before. Design and software expertise in post tensioning 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 post tensioned concrete structures. Bbr contech is nzs specialist in concrete posttensioning. The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a post tensioned. The forces contained within post tensioning tendons demand that owners, designers and contractors who maintain these structures have a high level of technical knowledge and skills to ensure the safety of the structure and of individuals working on, near or in the vicinity of a post.
Nov 19, 2016 the alternative to pretensioning is post tensioning. Post tensioning can be used for repairs, modification and strengthening of reinforced concrete and post tensioned structures. Bbr contech offers advisory, design and construction services for structural and civil engineering projects of any size and scale, including retrofitting and strengthening weakened and damaged structures. Conventionally without post tensioning concrete would have to be poured very thick to handle loads, in addition, the size and length of concrete structures. Post tension slab advantages and disadvantages of post. Post tensioning chucks post tension accessories post tensioning strand post tensioning jacks post tensioning rams. Post tensioning is the primary method of prestressing, where the tendons are stressed after the masonry has been placed. Post tensioning the program enables the user to define and design posttensioned concrete beams and slabs for any strap model.
Posttension cables are used in concrete construction to allow thinner slabs and greater span lengths between support columns. Adapt corporation specializes in structural concrete design software for post tensioning, reinforced concrete, and prestressed beam, slab, foundation. Design floors and foundations reliably and efficiently, saving time and money, and overcoming the most common concerns you face as a designer. This course provides the user with a fundamental understanding of posttensioned concrete design to enable the use of a spreadsheet program. For the repair and modification of post tensioning pt systems as well as post tensioned concrete structure repair and protection, structural technologies offers highly specialized products and services including investigation, repair design support, repair and replacement components, corrosion protection products, strengthening solutions as well as new or replacement post tensioning systems. For general design philosophy and analysis of posttensioned concrete, the. Beam line, shell surface and solid volume modelling of concrete is supported. Once the concrete has gained strength, tension is then applied, pulling the tendons and anchoring them against the outer edges of the concrete, before service loads are. 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. Posten engineering systems structural engineering is. Posten post tensioned and reinforced concrete design. In this article, ill be giving homeowners some necessary information about the characteristics, advantages, disadvantages, and common questionsconcerns that i receive regarding posttensioned foundations. Post tension slab design software mck26 structural. Economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility.
Eriksson software precastprestressed concrete design and. Economically design post tensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. The results of this program have been compared to other proprietary software that. And while code allows a licensed design professional ldp to delegate the design of the general anchorage zone to the contractor, we dont recommend taking that route. Nov 25, 2008 post tensioned concrete is a term heard more and more in the construction industry today. Posttensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons. Suncoast posttension is north americas largest unbonded post tension specialist. Pt designer design of posttensioned concrete floors. For residential construction, tendons at 48 inches on center are common. Tendons today are seven highstrength steel wires wound together and placed inside a plastic duct.
These cables, composed of steel wires inserted into a plastic sheath, are subsequently tensioned and grouted after the concrete is poured. Post tensioning is a method of reinforcing concrete. Software for posttensioned or prestressed structures. Posttensioning concrete increases the many benefits associated with a concrete framed building. This tek focuses on the design of concrete masonry walls constructed with vertical post tensioned tendons. These dowels allow for initial shrinkage to take place and then are locked in position with a mechanical plate and a controlled amount of epoxy resin. Aug 30, 2017 this spreadsheet program provides for the design and analysis of post tensioned concrete oneway beam and slab systems and twoway flat plate slab 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.
Posttensioned, reinforced concrete slab design software ram. The program enables the user to define and design post tensioned concrete beams and slabs for any strap model. Pt designer is a computer program for the design and analysis of linear post tensioned concrete floor systems. The program provides for the ultimate strength and service stress design and analysis of oneway beam and slab and twoway flat plate systems.
Post tensioning pt is one of the most advanced and efficient technologies used to reinforce concrete. Since the early 1950s, post tension tendons have been used in the design of concrete structures. This spreadsheet program provides for the design and analysis of post tensioned concrete oneway beam and slab systems and twoway flat plate slab systems. Top 10 biggest mistakes made in posttensioned concrete design. 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. Posttensioned concrete portland cement association. Eriksson software is an engineering software development firm located in tampa, florida. List of contents structural design criteria for the project submitted in a separate package input data. Most precast, prestressed concrete is actually pretensionedthe steel is pulled before the concrete is poured. Homeowners are getting crushed by flawed posttension cable. The use of post tension tendons allows the engineer to design for larger slab construction spans typically used in parking structures or high rise. For an excellent overview of pt, visit the post tensioning institute. 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.
Posttensioned concrete design spreadsheet program a pdh. Post tension pt tendon systems are primarily used for large slab construction projects. Whats the solution of cracks in the post tensioning slab. Replacing it will be the first building in new zealand constructed with posttensioned lvl frames and posttensioned lvl walls. Posttensioning institute education pt applications. While trimble navigations christchurch officewarehouse survived the 2010 and 2011 earthquakes, it wasnt destined to last for long. Prestressing post tensioned concrete software design workshop the workshop this new pt software workshop will allow structuralcivil engineers to design pt structures quickly whilst still understanding the processes involved via a more interactive input of data and output of results. Whether you are doing a residential or commercial project, we have everything you need to get the job done. Impact of deterioration of post tensioned tendons in bridges. In 1971, hugh oneil created posten to enable rapid, detailed and efficient designs of post tensioned and reinforced concrete structures. These devices are usually referred to as end anchorages. Adaptbuilder structural concrete design suite 3d fem design.
Post tensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons. The program enables the user to define and design post tensioned concrete beams and slabs for any strap model the user has full flexibility in defining the number of the cables and their shape. Given the early age strength requirement, post tensioned concrete is classified as a special class concrete by as79. The rise of elevated, posttensioned concrete slab systems. The article describes some of the commonly used techniques and precautions for detensioning tendons, repairs and restressing of tendons. Digital concrete scanning services construction of posttensioned slabs on grade is very similar to using reinforcing steel, except for the tensioning step. 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. Steel is strong under forces of tension, so combining the two elements results in the creation of very strong concrete components. The program is developed around the robust computational core of two popular programs ptdata.
Jun 22, 2017 homeowners are getting crushed by flawed post tension cable foundations the switch from steel rebar to post tension cable by houston area home builders has delivered unmistakable results post tension cable foundations are failing earlier and in far greater numbers than steel rebar foundations. Post tensioned wall construction uses standard materials. Software pt designer is a computer program for the design and analysis of linear posttensioned concrete floor systems. See the adjacent software information links for general details regarding lusas. Sep 09, 2016 course study on post tension slab design. Post tensioning 61 component enables tekla structures to accurately model most post tensioning profiles and attributes. In a post tensioned beam, the tendons are stressed and each end is anchored to the concrete section after the concrete has been cast and has.
Posttensioning methods for reinforcing concrete the. Post tensioned concrete means that the concrete is poured and then the tension is appliedbut it is still stressed before the loads are applied so it is still prestressed. Download free, highquality cad drawings, blocks and details of post tensioned concrete organized by masterformat. Net, which many engineers have come to trust over the years for its accuracy and flexibility. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen on other softwares. The compressive stresses resist the anticipated tension stresses induced by the soil movements, enhancing the performance over a nonprestressed foundation. 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.
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