Cables are arranged as indicated by the engineer and chaired to run through the center of the slab. Adaptpt posttensioned slab and beam design software. Twoway pt slab design tutorial with adaptfloor pro session 1. This course provides the documentation to enable the use of a posttension design spreadsheet program for oneway concrete beam and slab and twoway. 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. Concrete bridge design and analysis software bentley. Calculation and the theory by which the software works are attached with this softwares index, this thing is not seen. Features to allow finding the design that makes the most efficent use of materials including thinnest slab thickness or the most. Flat plate concrete floor system does not use beams between columns or. Fundamentals of posttensioned concrete design for buildings. The effects of different parameters are investigated in this study. Posttensioned and reinforced concrete slab and beam design.
For economical design of similar structures a smaller slab thickness leading to values between 60% to 80% of balanced selfweight is generally selected. The presented specifications were adopted for indirect control of deflections in the fip recommendations for the design of posttensioned slabs and foundation rafts, under preparation by fip commission 3. This allowance eases the structural engineers design process and ultimately simplifies construction. The quantities of the materials are calculated and cost of construction for slabs are determined and compared. Jurgens his article presents a set of guidelines intended to t assist designers in routine posttensioning design, beginning with a discussion of the initial decisions that must be made to. Posttensioned and reinforced concrete slab and beam. This report is intended to serve as a manual of good practice for the design of prestressed concrete flat slabs in addition to the recommended procedures, other methods are described for the sake of completeness and to compare different methods of design. Posttensioned, reinforced concrete slab design software ram. Pt designer is a computer program for the design and analysis of linear posttensioned concrete floor systems.
The medical office building malvern, pa 17 brendon burley structural option posttensioned twoway slab figure 23 details of the twoway slab. Six problems with posttensioning force specifications. Experimental and numerical assessment of bonded and unbonded posttensioned concrete members. This web seminar will focus on the design of posttensioned two way flat slabs that can be used for a multitude of building applications ranging from parking, hotel, office and podium type structures. A detailed explanation will be given of the checksto be carried out, the aspects to be considered in the design and the construction procedures and sequences of a post tensioned slab. In posttensioned floor slab construction, the placement of. The program is developed around the robust computational core of two popular programs ptdata. Increase your efficiency with bidirectional links to the industry leading bim products. Twoway posttensioned flat slab design in adapt builder 2018. Post tensioning in buildings is not limited to floor slabs. 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. Behavior of twoway post tension flat slab science publishing.
Twoway posttensioned slabs have been an extremely popular floorframing system in american building construction. Design was conducted by hand through a series of excel spreadsheets and compared to results found using the computer analysis program. If you continue to use the site without changing your cookie settings, we assume you are fine with our cookies and the way we use them. Adapt ptdesign of two way slab post tension01 youtube. The design is based on hong kong building code hkcop 2004 and its amendment of june 2007. Top 10 biggest mistakes made in posttensioned concrete. Pdf time saving design aids twoway posttensioned design. Key concepts such as load balancing, secondary moments, prestress losses, applicable code requirements and their impact on design. 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.
Whether the project is local or overseas, design codes from around the globe are available for reinforced concrete and post tensioned slab design. One interesting application is for a concrete countertop that needed to span 6 feet and carry a heavy load. The following graph in figure was made to show the shear distribution along the posttensioned slab. Pt designer design of posttensioned concrete floors. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc. Neglecting to design general anchorage zones or delegating this responsibility. The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a posttensioned member.
In twoway slab, the ratio of longer span l to shorter span b is less than 2 1. The vast majority of post tensioning tendons used in these slabs have been unbonded. Its more user friendly compared to other pt design softwares. The typical posttensioned twoway slab system uses 12 in. Safe is the ultimate tool for designing concrete floor. The following graph in figure was made to show the shear distribution along the post tensioned slab. Concrete water tanks are often posttensioned to reduce crack width and leakage. This web seminar will focus on the design of post tensioned two way flat slabs that can be used for a multitude of building applications ranging from parking, hotel, office and podium type structures. The execution of the design will be explained with reference. It has been developed in close coordination with leading australian structural engineers specialising in posttensioned slab design with the aim of not just providing a powerful analytical tool but speeding up the entire posttensioned design and detailing process.
What is the best software to design a post tension slab. This web seminar will focus on the design of posttensioned two way flat slabs that can be used for a multitude of building applications ranging. Twoway post tensioned slabs have been an extremely popular floorframing system in american building construction. Top 10 biggest mistakes made in posttensioned concrete design. Posttension basics how posttensioned slabs are built the. This web seminar focuses on the design of posttensioned two way flat slabs that can be used for a multitude of building applications ranging from parking, hotel, office and podium type structures. Fundamentals of posttensioned concrete design for buildings part one a suncam online continuing education course. Jurgens his article presents a set of guidelines intended to t assist designers in routine post tensioning design, beginning with a discussion of the initial decisions that must be made to design post tensioned floor members. Slabs of any shape can be analysed including suspended slabs and slabonground. Leap bridge concrete is design and analysis software for concrete bridges of all types. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Twoway posttensioned design amsysco post tensioning.
Developers, architects, engineers, contractors, educators and. In california, posttensioned floor slabs are the primary choice in concrete floor construction. 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. In their two most popular forms one way slabs, two way flat. Architectural benefits posttensioned slab has an advantage over others as it makes a very efficient base for floor design with thin slabs and columnless spaces in larger spans. Presentations will focus on design, analysis, and construction of posttensioned buildings and will include handson training on the design and analysis of new posttensioned building structures. Ram concept is a software application for the structural analysis and design of conventionally reinforced and posttensioned concrete floors, mats, and rafts. Design seminar descriptions posttensioning institute. Ebooks rc design road design cad blocks sketchup mathematics construction programming foundation autocad reinforced concrete books software building specifications specification tutorials cutout prestressed concrete. Post tensioning of foundations, transfer beams and plates, post tensioned masonry and the combination of precast elements with castinplace concrete by means of post tensioning offer other interesting opportunities. Design posttensioned and conventional systems design elevated concrete slabs with or without posttensioning. A numerical model for discretized the twoway reinforced concrete flat slab with different system is investigated by using ram software. Ram concept contains an advanced feature set that allows for the design of a wide variety of floor systems including posttensioned, reinforced concrete and hybrid systems, elevated slabs and mat. Ram concept contains an advanced feature set that allows for the design of a wide variety of floor systems including post tensioned, reinforced concrete and hybrid systems, elevated slabs and matraft foundations, oneway slabs, twoway slabs, beams, and joist systems.
Tuesday, 10 december 2019 two ways post tension slab design. Jul 21, 2017 is a two dimensional post tension beam slab design software. Because this course is intended to illustrate simplified analysis methods, we will use the efm exclusively. From the study it is considered that post tension slab is more economical than twoway slab. 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. Two way post tension slab design khmer language sona. The topics of balance loads equivalent loads, slab thickness, punching shear, use of computer software and keys to an efficient design are. Construction of post tensioned slabs on grade is very similar to using reinforcing steel, except for the tensioning step. Transmission of loads in the twoway prestressed slab s has t wo stages. Fundamentals of post tensioned design for buildings. A slab tensioned against hardened concrete after the.
Design method may not be used for twoway, post tensioned slab systems. Does anyone know of any good sources for hand calculations for a twoway post tensioned slab. Using the shear design method found in the pci design handbook precast and prestressed concrete 6th edition, the shear values were calculated at 3 ft, 8 ft, 12 ft and 18 ft from the support. However, because the continuous twoway tendons had to be placed in a draped parabolic profile near the top of. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Post tension analysis shear strength using the shear design method found in the pci design handbook precast and prestressed concrete 6th edition, the shear values were calculated at 3 ft, 8 ft, 12 ft and 18 ft from the support. The example presented here is for twoway post tensioned. The general criteria used for the design, such as details of material.
Multi storey, post tension, two way, design, comparison. Rapt is a two dimensional post tension beamslab design software. The vast majority of posttensioning tendons used in these slabs have been unbonded. It is a slab supported by beams on all the four sides and the loads are carried by the supports along both directions, it is known as twoway slab. In the united states alone, it is estimated that there are 2. Analysis and design of rcc and posttensioned flat slabs. Guidelines for the design of posttensioned floors by bijan o.
An overview is presented on the application and design of such floor systems, and the commonly selected castinplace floor system configurations are described. This report presents the structural engineering calculations of a posttensioned floor using parallel beams and oneway slab construction. Twoway restrained slab if the slabs consist more than one panel or corner of the slab are prevent against lifting it is define as twoway restrained slab. Posten post tensioning and reinforced concrete design software. The design bending moment of twoway restrained slab can be calculated as follows. Banded tendons when designing twoway, post tensioned slab systems, in addition to the code. This condition occur when the slabs are connected monolithically with support. Adapt ptdesign of two way slab post tension01 cefci civil engineering. This web seminar focuses on the design of posttensioned two way flat slabs that can be used for a multitude of building applications ranging from parking. Banded tendons when designing twoway, posttensioned slab systems, in addition to the code.
Design method may not be used for twoway, posttensioned slab systems. For residential construction, tendons at 48 inches on center are common. Shrinkage and temperature reinforcement in twoway post. Fast and efficient design of posttensioned beams, oneway and twoway slabs and mat foundations. Twoway post tensioned flat slab design in adapt builder 2018. We recommend using pt for temperature and shrinkage reinforcement. Im trying to do a quick check of the capacity of an existing building.
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. Finite element modeling of posttensioned twoway concrete slabs. Fundamentals of posttensioned concrete design for buildings part one. Project examples to illustrate various uses of posttensioning in buildings, tendon arrangement in common floor systems. Whether the project is local or overseas, design codes from around the globe are available for reinforced concrete and posttensioned slab design. 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. Twoway flat plate concrete floor system analysis and design the concrete floor slab system shown below is for an intermediate floor to be designed considering partition weight 20 psf, and unfactored live load 40 psf. A 2 2area 2 a c 2 2 posttensioned concrete design table 11 list of symbols used in the aci 31808 code cp area enclosed by the outside perimeter of the section, in a g gross area of concrete, in a 2 l total area of longitudinal reinforcement to resist torsion, in a o area enclosed by the shear flow path, sqin a oh area enclosed by the centerline of the outermost closed. Finite element modeling of posttensioned twoway concrete.
Load balancing is used, a portion of the load on slab is balanced by the transverse forces imposed by the draped. Design floors and foundations reliably and efficiently, saving time and money, and overcoming the most common concerns you face as a designer. Slab member comparison using rapt reinforced and posttensioned concrete design software this will be a two span continuous slab 4. Originally posttensioned, twoway slab framing systems were constructed with column and middle strips, similar to those used in conventionally reinforced twoway slabs. 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. Nov 25, 2008 post tensioned concrete is a term heard more and more in the construction industry today. Net, which many engineers have come to trust over the years for its accuracy and flexibility. Adapt corporation posttensioning and reinforced concrete. What should the proportion 2 way post tensioned slab structural engineering general discussion engtips. Focus will be on posttensioning design and analysis, and construction considerations. This spreadsheet program provides for the design and analysis of posttensioned concrete oneway beam and slab systems and twoway flat plate slab systems.
Adaptpt and rc software for the efficient design of posttensioned and mild reinforced concrete slabs and. Interior left, exterior right deflection analysis the final consideration in the design of the twoway slabs is deflection. Introduction posttensioned concrete slabs have become a major factor on the construction of floor systems for commercial and residential buildings of all types. General after making an initial selection of the slab thickness, the second step in slab design is to determine the amount and distribution of prestress. By doing the comparative analysis and design of post tensioned flat slab with a conventional slab, we can show how beneficial will be the process of making pt flat slab than other slabs. Post tension slab design software sethguthrie civilenvironmental 18 aug 16 19. Limitations on slab dimensions and required material quantities are presented and discussed. Part three continues with the study of twoway, posttensioned slab systems, including. Adaptpt 2012 posttensioned slab and beam design software. Consider all major aspects of slab design including service, ductility, and strength limit states, codeprescribed requirements, longterm deflections, punching shear, and walking vibration. We use cookies to provide you with the best possible user experience.
Part three continues with the study of twoway, post tensioned slab systems, including. Two way post tension slab design khmer language civil. Posten post tensioned and reinforced concrete design. This webinar will present a stepbystep tutorial for the design of a singlelevel twoway posttensioned slab in adaptfloors fem platform. These tendons run the full length of the slab between bands and are specified to be at the center of the slab with no vertical curved profile, as shown in fig. The program is divided into three separate screens, which correspond to the three major areas of concern in the design of a posttensioned. Optimization of twoway posttensioned concrete floor systems. Supports up to 25 spans plus a cantilever at either or both. This web seminar focuses on the design of post tensioned two way flat slabs that can be used for a multitude of building applications ranging from parking, hotel, office and podium type structures.
We show you how to design of two way slab post tension in adapt pt, in this video. Concrete slab design software economically design posttensioned and reinforced concrete floors including slabs, mats, and rafts, with exceptional visibility into compliance, efficiency, and practicality. Analysing a two span slab using structural toolkit. Pdf experimental and numerical assessment of bonded and. Post tension floors pt are one of the most widely used system which are very effective method regarding ultimate and serviceability limit states.
977 340 429 1135 822 380 1428 1315 107 148 570 1512 348 557 721 1418 905 564 385 302 177 885 113 1058 98 518 874 560 185 378 553 407 112 382 259 493 585 419 634 926 1359 736 396 826 28 1391