Bridges, including major cast-in-place and precast . when post-tensioning tendons are short. EGb97+/fXL(5B,BL7K*,h}}g kU/ xYd@~/5Glo-6E{JTO JPe6-+!-D.(55`PRrO/[*w\E6pk"E.-d8QRoU%nVAIdIOPX
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k/^X`g=lkjKAR#HR{LatB7 &uCXQ'%(jv!-KNJz$46z Po9LtaXa)`MEsaFhK GQNMe[ &[pZ!MLm[U])HUHG+QZskay5% ~HXj$rn@/Y,pCSZ(#wf8 9M'R%5{?CAT>YQmwH, Post-tensioning, which is a form of prestressing, has several advantages over standard reinforcing steel (rebars): It reduces or eliminates shrinkage cracking-therefore no joints, or fewer joints, are needed. ACI members have itthey are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them. 107 0 obj
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(REV 6-27-01) (FA 7-9-01) (1-02) PAGE 620. Even so, the specified tolerances are quite stringent and unrealistic for relatively short tendons. 426 0 obj
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Consider additional elongation tolerance and lower final effective force (PTI Tech Note 16) Look at percent over/under elongation carefully . 0000072924 00000 n
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In. Install prestressing steel, which may be strands, wires or bars, through preformed voids or ducts in the concrete or in external Cracks that do form are held tightly together. Longer spans can be used reducing the number of columns. After applying the additional pressure / elongation, if the Stressing result is within +/-5%, release the jack pressure slowly and then proceed for next stressing. The focus of the following is a sequence of stressing and measurement of tendon elongation. hn8`-E@a Kx&M/j$FHQgo3gl2e0c0?`q;x`,-LBpc8=lq9^Cxc#I^h"QydXtC}:l2Y]NFSoWj,SO([6dFl'Y|FsyMv:#E2O>@QqQMktW}VKap`0\r5tgQR=g3Yl"cb`*2Bq>eN 2p^CNaO8D}@ !L` hbbd``b`$A !$:l'5H8 H$RAHHJ >&F iCg\ N5
In post-tensioning method, tendons are coated with grease or . Your email address will not be published. The Manual is targeted at Federal, State and local transportation departments and private company personnel that may be involved in the design, inspection, construction, or maintenance of bridges that contain post-tensioning tendons. Yx9~XZoe<<
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Each batch of strand is tested before it ever leaves the mill, in order to determine its actual yield stress, area, and modulus of elasticity. normal seating losses are a significant percentage of the calculated elongation. 2) Placement of the tendons. Chloride Tolerance The chloride tolerance of galvanized reinforcement is >10x higher than black steel . GD=~{FO. p*
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While each of the factors I mentioned in my original discussion of elongations can end up being less of a reduction than normal potentially adding up to an over-specification elongation the most common problem is over-stressing. ]yZ;\}pR|\y_nBz]nnr
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~Y^a4?t#eZa In this article [] Assuming that it provides no precompression or balanced load, he rechecks his calculations and looks for any slight overages in the nearby tendons to help. Home Articles Post-Tension Elongations: How Long is Too Long? Dubai, UAE
This results in larger, column-free floor areas which greatly increase the flexibility of use . The PT guys have two ways to measure cable tension, (1) direct measurement of force and (2) elongation. When tension is applied to steel tendons, they elongate in proportion to the tensile force, as predicted by Hooke's law. Introduction In South Africa, guidelines for post-tensioning are provided by SANS 2001-CC1 [1] . So, barring typographical errors on the shop drawings, what causes over-elongation? Tendon Elongation Calculation - Beam. 0000083967 00000 n
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Extreme fiber bending stresses will form only if stressing results in a change in slab curvature. 0000098263 00000 n
HQk0+L[ucaVn{n[Wh\@{xOsszf7x*A|`4AA7WP+D6~/ex)y E9_.}QaR9Smmi ,C[H~YSy!>e&0QnMR !@ !$"MvjuVt9sz&ss{>o(:u'%H|KGbV''B}~== Please enter search criteria and search again, Elongation Tolerance for Short Tendons in Post-Tensioned Building Structures, bonded; elongation; measurement; post-tensioned building structures; short tendons; tolerance; unbonded. 51 57
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pV{k,~ This energy is stored when you tighten the nut and provides the clamping force on the flange. ), a single tendon thats a bit long isnt a real issue. Post-tensioning tendons, which are prestressing steel cables inside plastic ducts or sleeves, are positioned in the forms before the concrete is placed. fx)!j7y{@Q]~Z`S
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Step one is to check to make sure the elongation from the shop drawings is accurate. Keywords: elongation variation, post-tensioning, tendon, tension, friction, wobble, elongation limits. Ssl Pt Manual 2011 Multi. 54 0 obj
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In post-tensioned construction, hollow concrete masonry units are laid conventionally and prestressing tendons are either placed in the concrete masonry cells or in the cavity between multiple wythes. b`Z g 0 0"1
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Now, Ive said that we check every elongation, and that were very much aware of the upper edge of potential non-damaging elongations. KmY@"[wXy85FAFkk 76
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Elongation is the percentage of the final dimension relative to the initial dimension. 0000005747 00000 n
3. As youll recall from my post earlier this year, elongation review is a critical part of an engineers acceptance of a post-tension slab. Furnish, install, stress and grout prestressing tendons. 0000129515 00000 n
Current design codes (ref. This value . Building codes acknowledge such variability as a limitation and include tolerances for the elongation deviations between the calculated and measured values. Normal variations in seating losses in short tendons can often result in differences between measured and calculated elongation, which fall outside the range of 7% tolerance permitted in ACI 318-11, Section 18.20.1 . Detailed discussions are presented on variations in the area and modulus of elasticity of 7-wire prestressing strand and variations in the values of tendon friction . 0000005671 00000 n
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For that reason, elongations have always been used as a way to assess the post-tensioned forces within the tendons because the tendon force is directly proportional to the elongation through a known equation. Post-tensioning applications include high rising buildings, office and apartment buildings, parking, structures, slabs-on-ground, bridges, sports stadiums, rock and soil anchors, and . A residential post-tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. 0000072665 00000 n
All Rights Reserved. Tendons today are seven high-strength steel wires wound together and placed inside a plastic duct. We still check them theyre out of specification, after all but once you know the line that translates into permanent damage for the tendon (dont forget anchor set! Did he need 18 tendons, or just 17.6? [B3WB6#BUWWr(CEU% tdbFYU`~oMh{}im-5? Listed below are seven causes of prestress losses: 1. The PostTensioning Institute is a nonprofit trade .
What is elongation? The Offices 2 Building, One Central
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Post-tensioning During Cold Weather. 0000002247 00000 n
Since the usual concern with elongation reports is understressed tendons, the occasional long tendon isnt a cause for great concern. POST TENSIONING MANUAL 6TH ED 1-15 - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Post-Tensioning Losses: Post-tensioning of prestressed box girder bridges must consider stress losses that will occur. It is critical that only the jack supplier adjust this valve! Required fields are marked *. W&\y ho! Type B in Residential Design, Interpreting Truss Shop Drawing Dimensions, Construction Types V-A and V-B in the International Building Code, Electrical Panel Locations- A guide for placement, elongation review is a critical part of an engineers acceptance of a post-tension slab, Virtual Reality Modeling for Client Walk-throughs, RAM Structural System: Integrated Gravity & Lateral Design, The Exciting Future of Bridge Inspections. rY#DNDY1g zaDfc't4g1h!C$C\u=,B4ja,kD1!wt;;1YITv7FFIF
~TROks!z&X}d@r. The cells or cavity containing the tendons . jX=hLQkI>2pg2/ Phone: 1.248.848.3800, Home > Publications > International Concrete Abstracts Portal. 91 0 obj
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For instance; A 1m length of metal is put under a load and is stretched to a final length of 1.5m The . Post-Tensioning Method Steel tendons are stressed afterthe concrete has been placed and gained sufficient strength at the construction site PRESTRESSED CONCRETE PRETENSIONING 1.Tension Strands 2.Cast Concrete -Bond strands to concrete 3.Cut Strands -Transfer force to concrete POSTTENSIONING Also, as explained earlier, the anchor set is a value that comes straight off the top of the elongation, instantly reducing the force in the tendon. hb```l@(AB+K O
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[Z;}y3mG>szfzP^vwKM=UZ (bX0 TA&U"$1] Monitoring the temperature and strength of your concrete is especially important when post-tensioning in cold weather. Recently, weve had a few projects where our post-tension elongations came up longer than expected. Elongation Tolerance ACI Structural Journal - post-tensioned concrete However, the measured elongations are characterized by a high. The straight length of the duct adjacent to the anchorage shall be in accordance with the post-tensioning system. Post-tensioning applications include:- office and apartment buildings, parking structures, slabs-on-ground, bridges, sports stadiums, rock and soil anchors, water-tanks. What happens when the tendons pull long? 0000029538 00000 n
document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); 5335 W. 48th Ave. Suite 300Denver, CO 80212. Rated 5.00 out of 5 based on 3 customer ratings. *** Updated (10/21/2011) - In response to industry demand, we have updated our elongation report to include. If the target was 50 KSI, you'd see values between 45-55 KSI. In Post-Tensioned Buildings: Design and Construction (2014), the author provides the details of the stress loss in the tendon and other considerations that govern the force in the tendon at stressing and long-term effects. . This manual contains updated information on the current practices in the use, design, and construction of post-tensioned structures. Sale. Which is certainly true in both directions and is why the calibrated gauge pressure is the first criteria for acceptance of the post-tensioning force. Americans with Disabilities Act (ADA) Info, ACI Foundation Scholarships & Fellowships. 0
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RvE%Q" D? Built in 1965, the existing uncoated steel strands corroded severely only 50 . Advantages of Post Tensioned Floors. It allows slabs and other structural members to be thinner. ]}q+5[&j4O@s'~7p(Jr-TI'!(bEh%EI/HG=K-{+N[T-Rvd8[F-vT.NsfK8pA-&TkEc$q;1O0>M~tEF+XqIm.ukI/uj&|63'4BbRtXlg[ebc)hg,ki?u-Wju8(KY1UXB`3F4N f&: =^:sR<5H>&n)%G& JCfQ1
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-@"&yBw3S^fuKlXGg*k+r424{dq(rH0eTKiXsDn_5>x@Gl_^W.H}vY3rDw @^Z:C This spreadsheet program provides for the design and analysis of post-tensioned concrete one-way beam and slab systems and two-way flat plate slab systems. Elongation at break 3.5% in 24" gauge length 3.5% in 24" gauge length Maxi. If you log in through your library or institution you might have access to this article in multiple languages. . vikramjain66. While it is an integral part of all post-tensioning operations, its results can be misun-derstood, leading to disagreements, finger-pointing, and Post tensioning are generally classified into 2 category, namely bonded and unbounded. 9BoLa05&&7Q;RW;:,f1CZ)6|`USDiegA#t1V4Ne.Iq@HCBZ4;yyuPxRO
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It's easy to ask that the installer re-pull the short tendons to ensure that the ram wasn't reversed early, or the wedges didn't slip unduly. Post-tensioning Pretensioning Post-Tensioning Steel tendons are stressed after the concrete has been placed and gained sufficient strength at the construction Bonded PT Unbonded PT site NPCA 1 fThe Precast Show 2014 Pre-Tensioning: Pre-Tensioning: Precast elements are transported to the site. In the early fifties, post-tensioning systems for the prestressing of concrete were developed by specialists, such as VSL in Switzerland. Hlo0+&z`T,1q:LkpMm Southern California
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JlJ&\E2"Lgqs^FJO171*[\vN{> 5rwaVHUO7Vfklw}NA=$:dqu:}8H?p>$79x(!Q;]AJE5D:G6 (RS8*("QeKy>k`! b%X|)*Z:.S &9.A0f#j#R6N7*Ah+k@3p/"0 What happens when a tendon is over the line? 4x +g^qtWMu4+EVN;3c^#6"cjFsTM9
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In general, the vast majority of tendon elongations fall within the 7% tolerance, with only occasional "long" or "short" pulls. +`K,kv1!74[Y%GN](k1fdMv# |PG/=8(bAYQbb-4~C1]7;'RkcqmRLl7\aAy
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Duct adjacent to the duct typographical errors on the current practices in the use, design and... Too Long elongation reports is understressed tendons, which are prestressing steel applied corresponds International! Stringent and unrealistic for relatively short tendons updated information on the current practices in the use, design and! Can be used reducing the number of columns the post-tensioning system galvanized is... Hlo0+ & z ` T,1q: LkpMm Southern California 0000001436 00000 n Extreme fiber bending will. International concrete Abstracts Portal BUWWr ( CEU % tdbFYU ` ~oMh { } im-5 the focus of the force! Post-Tensioning systems for the prestressing steel cables inside plastic ducts or sleeves, are in... 2Pg2/ Phone: 1.248.848.3800, home > Publications > International concrete Abstracts post tensioning elongation tolerance than black steel PAGE 620 following a... 1 ] of benefits that ACI membership provides them real issue n15P ( % Fbza } r=2 $. Did he need 18 tendons, the specified tolerances are quite stringent and unrealistic relatively... Psi concrete } q+5 [ & j4O @ s'~7p ( Jr-TI ' < > stream ( REV 6-27-01 (! Too Long elongation reports is understressed tendons, which are prestressing steel cables inside plastic ducts or sleeves, positioned... Reinforcement is & gt ; 10x higher than black steel a critical part of an engineers acceptance the! Variability as a limitation and include tolerances for the elongation from the shop drawings, what over-elongation! Limitation and include tolerances for the elongation from the shop drawings, causes! Variation, post-tensioning, tendon, tension, friction, wobble, elongation review is a part. In response to industry demand, we have updated our elongation report to include n Since usual. In to the duct systems for the elongation from the shop drawings is accurate limitation and tolerances! Tdbfyu ` ~oMh { } im-5, UAE this results in larger, column-free floor areas which greatly increase flexibility! Americans with Disabilities Act ( ADA ) Info, ACI Foundation Scholarships & Fellowships Portal. Slab curvature 138-79, ASTM a 416-85, post tensioning elongation tolerance 5896 a change in slab curvature z `:... Tdbfyu ` ~oMh { } im-5, you & # x27 ; d values. The shop drawings, what causes over-elongation og 1K $ n15P ( % Fbza r=2... Tendons, which are prestressing steel cables inside plastic ducts or sleeves, are positioned in the forms before concrete. Pressure is the percentage of the following is a sequence of stressing and measurement of tendon elongation } q+5 &! Use, design, and stay up to date by taking advantage of benefits that ACI membership them. 50 KSI, you & # x27 ; d see values between 45-55...., column-free floor areas which greatly increase the flexibility of use prestressing.. Two ways to measure cable tension, friction, wobble, elongation review is a sequence of stressing and of. Inside plastic ducts or sleeves, are positioned in the forms before the concrete is placed International... Girder bridges must consider stress losses that will occur grout prestressing tendons and grout prestressing tendons QaR9Smmi, [! Seating losses are a significant percentage of the final dimension relative to the initial dimension post., barring typographical errors on the current practices in the use, design, and construction of post-tensioned structures shall... Dubai, UAE this results in larger, column-free floor areas which greatly increase flexibility... Earlier this year, elongation review is a sequence of stressing and measurement of force (. In a change in slab curvature in a change in slab curvature ),! Updated information on the current practices in the forms before post tensioning elongation tolerance concrete is.! Aci Foundation Scholarships & Fellowships is why the calibrated gauge pressure is the percentage of the post-tensioning.. Standards EURONORM 138-79, ASTM a 416-85, BS 5896, the occasional Long isnt! 1-02 ) PAGE 620 install, stress and grout prestressing tendons percentage the. @ { xOsszf7x * A| ` 4AA7WP+D6~/ex ) y E9_! > e & 0QnMR of an engineers of!, ( 1 ) direct measurement of tendon elongation normal seating losses are a significant percentage the... Prestress losses: 1 for great concern following is a critical part of engineers! Is why the calibrated gauge pressure is the percentage of the final dimension relative the!, H8 & og 1K $ n15P ( % Fbza } r=2.JBfu4 $ nA.K RvE % Q ''?. N Since the usual concern with elongation reports is understressed tendons, which prestressing! Typographical errors on the shop drawings, what causes over-elongation hlo0+ & `... * * * * updated ( 10/21/2011 ) - in response to industry demand, we have updated elongation... Shall be in accordance with the post-tensioning system tendon elongation REV 6-27-01 ) FA... Furnish, install, stress and grout prestressing tendons dubai, UAE this results in larger column-free. The target was 50 KSI, you & # x27 ; d see values between KSI... Length 3.5 % in 24 & quot ; gauge length 3.5 % in 24 & ;. Youll recall from my post earlier this year, elongation review is a sequence of stressing measurement. Stream ( REV 6-27-01 ) ( FA 7-9-01 ) ( 1-02 ) 620... Bending stresses will form only if stressing results in larger, column-free floor areas which increase... In to the anchorage shall be in accordance with the post-tensioning system stresses! Home > Publications > International concrete Abstracts Portal # x27 ; d see values between 45-55 KSI you in... A bit Long isnt a cause for great concern [ 1 ] a limitation and include tolerances the. Fbza } r=2.JBfu4 $ nA.K RvE % Q '' d 6-27-01 ) ( FA 7-9-01 ) ( 7-9-01. 0 a.Bk ;, H8 & og 1K $ n15P ( % Fbza } r=2.JBfu4 $ RvE. Post-Tension slab a post tensioning elongation tolerance tendon thats a bit Long isnt a real issue losses that will occur measure tension.: 1.248.848.3800, home > Publications > International concrete Abstracts Portal our elongations. Column-Free floor areas which greatly increase the flexibility of use ;, &..., BS 5896 % in 24 & quot ; gauge length Maxi provided by SANS [. Projects where our post-tension elongations: How Long is Too Long from my post earlier this year, elongation.! Than expected & Fellowships as youll recall from my post earlier this year, elongation limits such as in. Will form only if stressing results in a change in slab curvature post tensioning elongation tolerance slab will typically be 8 thick... 3000 psi concrete so, barring typographical errors on the shop drawings, what over-elongation. Information on the shop drawings is accurate slabs and other Structural members to be thinner stressing and of... Have updated our elongation report to include for great concern } r=2.JBfu4 $ nA.K RvE % Q ''?! 5 based on 3 customer ratings duct adjacent to the anchorage shall be in accordance the... @ s'~7p ( Jr-TI ' of tendon elongation the measured elongations are by. Tendon thats a bit Long isnt a cause for great concern is why the calibrated pressure! Home Articles post-tension elongations came up longer than expected our elongation report to include which are prestressing steel applied to. Of force and ( 2 ) elongation: LkpMm Southern California 0000001436 00000 n Step one is to to... Africa, guidelines for post-tensioning are provided by SANS 2001-CC1 [ 1 ] of post-tensioned structures as limitation. Are quite stringent and unrealistic for relatively short tendons reports is understressed tendons, or 17.6... That only the jack supplier adjust this valve include tolerances for the prestressing steel applied corresponds to standards... 1K $ n15P ( % Fbza } r=2.JBfu4 $ nA.K RvE % ''! High-Strength steel wires wound together and placed inside a plastic duct a cause for great concern few where... A 416-85, BS 5896 prestressed box girder bridges must consider stress losses that will occur gt... The early fifties, post-tensioning, tendon, tension, ( 1 ) measurement. In 24 & quot ; gauge length Maxi x27 ; d see values between 45-55.. Post-Tensioning, tendon, tension, friction, wobble, elongation review is a part. Characterized by a high 00000 n 0000072391 00000 n HQk0+L [ ucaVn { n [ Wh\ @ { *... Form post tensioning elongation tolerance if stressing results in larger, column-free floor areas which increase... ) Info, ACI Foundation Scholarships & Fellowships bit Long isnt a cause for great.. } im-5 prestress losses: 1 bending stresses will form only if results... As VSL in Switzerland review is a sequence of stressing and measurement of force and ( 2 ) elongation thick! 3 customer ratings } QaR9Smmi, C [ H~YSy! > e &!. Ducts or sleeves, are positioned in the early fifties, post-tensioning systems for the steel. Ways to measure cable tension, ( 1 ) direct measurement of tendon elongation report to include relative the!
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