Pdf acceptance criteria for unbonded posttensioned concrete. Recommendations for the acceptance of posttensioning systems pdf. December 2000 overview posttensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons. Dywidag bar post tensioning systems a successful tradition. Because the extent and nature of nonconforming conditions which may be found during future examination of oconees reactor building unbonded posttensioning systems are not yet known, it appears inappropriate to speculate on the extent. Unbonded post tensioning system technology in building. A posttensioning tendon is made up of one or more pieces of prestressing steel, coated with a protective coating, and housed inside of a duct or sheathing. Posttensioning institute pti design manual6 gives recommended. Types and properties pdf planning and design handbook on precast building structures pdf recommendations for the acceptance of posttensioning systems pdf back to. Requirements for design of a special unbonded post tensioned precast shear wall satisfying aci 550. Posttensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons. Acceptance criteria for supplementary requirements applicable to.
Systems are also foreseen for the slab post tensioning. Post tensioning tendon installation and grouting manual fhwa. Installation of strands, duct filling acceptance criteria given in paragraph 6. We hold technical approvals for internal and external posttensioning systems consisting of highstrength strands, wires and posttensioning bars and have the authority to carry out tensioning work.
Elongation tolerance for short tendons in posttensioned. Versatile, lightweight and compact, but immensely strong, ccls range of bespoke and standard systems gives engineers and contractors the flexibility they need to deliver cuttingedge contemporary structures on time and within budget. Post tensioning utilizes high quality high strength steel such that 1 kg of post tensioning strand may replace 3 or 4 kg of ordinary nonprestressed reinforcement. Section 7 of the ansineta standard for acceptance testing specifications for electrical power equipment and systems may be reproduced and used on a cut and paste basis for the particular type of equipment to be tested. This site is like a library, use search box in the. Recommendations for the acceptance of posttensioning systems pdf fip reports 1993. In that year, a tradition began that we have successfully continued on a global scale until today.
What is posttensioning introduction posttensioning is a method of producing prestressed concrete, masonry and other structural elements. These acceptance standards for post tensioning systems provide generally applicable technical requirements for post tensioning systems used in bridges, buildings, ground anchors, and other structures special project related requirements, which are not addressed herein, must be supplemented in the projects special provisions. Typically includes spiral confinement reinforcement. The nde methods outlined in this report explore different. Post tensioning is a special form of prestressed concrete in which the prestressing tendons are stressed after the concrete is cast. Dywidag bar posttensioning systems a successful tradition. Systems are also foreseen for the slab posttensioning. Test reports are available for the principal components of the system. The first ever structure built with a prototype of the dywidag bar post tensioning system was the alsleben arch bridge in germany in 1927.
All posttensioning strands shall be in accordance with the following. Posttensioning terminology ptt november 20 page 2 of 33 bearing plate, basic flat steel plate that transfers the tendon force directly into the concrete, meeting the analytical design requirements of pti acceptance standards for posttensioning systems, section 3. The following sections of the ansineta standard for acceptance testing specifications for. Shortterm elongation variation of posttensioned tendons. Throughout this chapter reference will be made to the aashto standard specifications for highway bridges and to the pti acceptance standards for post tensioning systems, they will be referred to as aashto and pti, respectively. As a specialized contractor with decades of experience in the specific field, tensacciai is able to provide not only the products and the. Tendon systems is a nationally recognized leader in the field of advanced concrete construction methods, made possible by the development and application of posttensioning techniques that form our core business. Inspection guidelines for bridge posttensioning and stay cable systems using nde methods describe nondestructive evaluation nde methods for assessing the condition of inservice posttensioning and stay cable systems. Recognizing this, acceptance standards for posttensioning.
These acceptance standards for posttensioning systems provide generally applicable technical requirements for posttensioning systems used in bridges, buildings, ground anchors, and other structures special project related requirements, which are not addressed herein, must be supplemented in the projects special provisions. Posttensioning applications include office and apartment buildings, parking structures, slabsonground, bridges, sports stadiums, rock. Upcoming changes to the aashto lrfd bridge design specifications. Anchorages details of anchorages for posttensioning tendons shall be according to the suppliers requirements.
C o n t e n t s 1 summary 2 chapter 1 introduction 2 purpose 2 scope 3 applicability 3 definitions and terminology 4 how to use the inspection guidelines 5 chapter 2 posttensioning and stay cable systems 5 introduction 5 overview of bridge posttensioning systems 7 components of posttensioning system 8 overview of bridge stay cable systems 9. Portions of the proposal pertaining to rebar and posttensioning operations is based on provisions from the american national standard ansiamerican society of safety engineers asse a10. The codes give a range for the friction parameters and leave it to the engineering professional to determine the appropriate value for each project as shown in table 1 taken from aci 423. Iwl2420 unbonded posttensioning systems a unbonded posttensioning systems shall be examined in accordance with iwl2520 at 1, 3, and 5 years following the completion of the containment structural integrity test and every 5 years thereafter. Pti publication order form posttensioning institute. The first ever structure built with a prototype of the dywidag bar posttensioning system was the alsleben arch bridge in germany in 1927. Loadcarrying performance and hydrostatic tests of encapsulated anchor systems for unbonded post tensioning singlestrands.
Trbs national cooperative highway research program nchrp research report 848. Acceptance criteria for etag exceed that of any other pt system test standards todate. All books are in clear copy here, and all files are secure so dont worry about it. The prestressing steel applied corresponds to international standards euronorm 879, astm a 41685, bs 5896.
Our systems are certified in accordance with etag 0 inspection guidelines guideline for the european technical approval for construction sets. Posttensioning in buildings foreword working party wp1. Ccl has undergone more than 70 tests on the x range system. Pt system and approval process florida department of. The company adds value throughout the project in terms of design, construction, systems, equipment and implementation. C o n t e n t s 1 summary 2 chapter 1 introduction 2 purpose 2 scope 3 applicability 3 definitions and terminology 4 how to use the inspection guidelines 5 chapter 2 post tensioning and stay cable systems 5 introduction 5 overview of bridge post tensioning systems 7 components of post tensioning system 8 overview of bridge stay cable systems 9. Posttensioning utilizes high quality high strength steel such that 1 kg of posttensioning strand may replace 3 or 4 kg of ordinary nonprestressed reinforcement. All post tensioning strands shall be in accordance with the following. Involved in projects from conception, ccl offers assistance to help clients meet the requirements of the structure and local technical standards. Guideline for european technical approval of posttensioning kits for. What is post tensioning introduction post tensioning is a method of producing prestressed concrete, masonry and other structural elements. Throughout this chapter reference will be made to the aashto standard specifications for highway bridges and to the pti acceptance standards for posttensioning systems, they will be referred to as aashto and pti, respectively.
Acceptance criteria for unbonded posttensioned concrete exposed to. Chapter 2 posttensioning system materials and components. Posttensioning terminology ptt november 20 bearing plate, basic flat steel plate that transfers the tendon force directly into the concrete, meeting the analytical design requirements of pti acceptance standards for posttensioning systems, section 3. Tendons of the multistrand vsl system may be made up of as much as 55 sevenwire strands of 15.
These acceptance standards for posttensioning systems provide generally applicable technical requirements for posttensioning systems used in bridges. Acceptance standards for post tensioning systems download. The implementation of external posttensioning systems is a very. Loadcarrying performance and hydrostatic tests of encapsulated anchor systems for unbonded posttensioning singlestrands. This guideline considers posttensioning systems for prestressing of structures or. The pt system as described in the eta meets the acceptance criteria of etag 0. Ccl posttensioning systems and etag approval carol g hayek phd, mba peter vincent. Nov 06, 2015 acceptance standards for post tensioning systems. The strength of the dywidag anchorages and couplers exceeds the requirements of aci 318 and the pti acceptance standards for post tensioning systems. Material requirements for pipe joint seals used in water and drainage applications.
The main objective of the bulletin is to point out the benefits of using post tensioning for. Pdf loadcarrying performance and hydrostatic tests of. In these standards the specification for high tensile steel wire and strand for the prestressing of concrete comply with the requirements of british standard, bs 5896 3, and the mechanical tests for post tensioning systems including. A posttensioning tendon consists of strands, duct, and anchorages. Certification for the installation of posttensioning. Polymer duct systems for internal bonded post tensioning. Inspection guidelines for bridge posttensioning and stay. The basic element of a posttensioning system is called a tendon. Acceptance criteria for posttensioning anchorages and couplers of prestressed concrete. Posttensioning and reinforcing steel osha regulations. Click download or read online button to get polymer duct systems for internal bonded post tensioning book now.
Forwards addl info requested in 980716 nrc ltr re 980506. We hold technical approvals for internal and external post tensioning systems consisting of highstrength strands, wires and post tensioning bars and have the authority to carry out tensioning work. General principales local zone design general zone design. Ccl has a reputation for delivering a responsive, flexible, costeffective service and high quality civil engineering solutions worldwide. The term prestressing is used to describe the process of introducing internal forces or stress into a concrete or masonry element during the construction process in order to. Comprehensive evaluation of multistrand posttensioning anchorage systems for seismic resilient rocking wall structures. Requirements for design of a special unbonded posttensioned precast shear wall satisfying aci 550. Castings should be nonporous and free of sand, blow holes, voids, and other defects. Tendon systems is a nationally recognized leader in the field of \u0003advanced concrete construction methods, made possible by \u0003the development and application of post tensioning techniques that form our core business. Standard for acceptance testing specifications for. Shortterm elongation variation of posttensioned tendons m dundu. All proposed posttensioning systems shall meet the induced slip requirements specified in the contract documents. Reinforcing and prestressing steel for concrete and ancillaries.
Additional information on design and behavior of tendon anchorage zones and background information for the aashto. A minimum of 21 load tests are needed per anchorage system. Inspection guidelines for bridge post tensioning and stay cable systems using nde methods describe nondestructive evaluation nde methods for assessing the condition of inservice post tensioning and stay cable systems. Posttensioning is a special form of prestressed concrete in which the prestressing tendons are stressed after the concrete is cast. Please click button to get acceptance standards for post tensioning systems book now. In these standards the specification for high tensile steel wire and strand for the prestressing of concrete comply with the requirements of british standard, bs 5896 3, and the mechanical tests for posttensioning systems including. Pti acceptance standards for posttensioning systems pti specifications for grouting of posttensioned structures aashto lrfd bridge construction specification fdot standard provisions caltrans standard provisions fib bulletin 33 durability of posttensioning tendons. Adequacy of strandwedge connections to be established for each new strandwedge type combination not previously authorized by caltrans per section 4.
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