There are two types of pre-tension construction, namely the pre-tensioning method and the post-tensioning method. The tendon can have a three-dimensional profile and may be jacked from one or both ends. The calculations determine what the tendons final force is after short-term and long-term friction losses. 'IYOZSu"P_&r'P+OYp#4,I]8,j_?MG003-bQL]9iK.#m:eUu"9LRhFJ3YmYfNa0` 9a!.C!a&)!cpe2cAd-7TOM1,PK$E\.+)QK8D7854h3HcT*6-8,f;B1taKl9I_%u-4 N'dqE3Y#b#rPS@TccJ\9b"5;rTg8K0:`?aB;McZ-'(Q8LAm$N$+O:+\7)uY'.B*l] fb=L\*,gm:KYT`ZI6`K_9?%a[2NSB$\7Ge]/d5WfL0.0'\4_Fp3eY"$F!t;t82I=A ,&MrO)UKrU!7'*9$R03.e^WHMAcRocP>^&O(K:,RH+:9&4BL]1k`d=_1B@olZs&"! Be the first to comment. All software and resources in the CESDb.com directory are property of their respective authors. '+p=kRRTl;R`f=Tla=>.cP)"^f4EIXn;JcS4;B/-r],O+pkJ%"O@9WNZjM-DXY@ ;c5D? 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In the early fifties, post-tensioning systems for the prestressing of concrete were developed by specialists, such as VSL in Switzerland. ,q:7,$%oe@aq4e('l.m(#U_?q9rAQEk>qD4rdTEU)PY+tWg^H8.>l"CQESIm_ZhWl *"KH[0P[Vk_5gNY#qYQ"r=4q+.tSWA.?aK:.1f0LX"Z"['! (lm&$R9Jlm$f9>0s!gH _c[EF.'X`#)U>tLB6Ch1ZmFa'doaiZb&%l)iKRXW_ne/l&n..OLOrBnD@/kX! ?^Z8kQ3[--Chq?rUluaK*.B)QtKMne:DAe9ZM-OQtQtLimg+Ig%W0S'fW[eh>)\ahW HNT\;\ZJK=J.$O;=4QUXD$X*[#>CqDkqHiq7#R@nVKEb;rM8\9%\]jVp1;&ZCIt(O >S!;A>AW[g4ghX33jVs6(JQcjE>`C$l*&E,nX^6V\($pO5%\:Gt_!KO//Of@E$_#blN%hk09Tp? The application is designed to aid in schematic design, value engineering, and structural type study comparisons that can be used in the planning process for building construction. All equipment shall be carefully examined and all hoses and couplings checked for the leaks and general condition. This cookie is set by GDPR Cookie Consent plugin. Method Statement for Post Tensioning Friction Test. 4) Applying tension to the tendons. @kjS"BN'_'5'Jf@6R+=r[F.EcUJ`5!WaI`U:p,U( @*u4(1,tRcZ,8,Ce7fm?N:Bpg*KLG:'G2oT]K@O;<64'727gJM_e7BO/^l5/Y5:W& :F;F.#2XF3#1;Zl\0X&*VSuObd`U*^?o8`sL;RHFD?__qN\Uc3pI&dpclGkNPB! Modified Young's Modulus in (as per TC) N/ mm2 ME. 4 Pressure gauge 2 nos O=(2i*BjTLUg,(pf/Vp^<9C?P/Jb)RoU_f! :6%?MJ/b66]lKX!&;2G>XFR>PO:jAm'MM&o<2qbe ck1hte((7"a6NO59b:c(Z("_s'oU_0Lt!/u#rRH$s,DJLtRE3,s7"n`EHhZ+[e@PonLdtXN_b.c[7Y+SO+>Rpss8<9oZ>Yorp;@RTp/h (RZg:OY/E=^J`N2gPdK0"dTtX^5d>SbGa;G4`r`L%flr&'ffFOrE!8YKZPAY&o]V( :sTd=a]_)caUsW\7>,! However, you may visit "Cookie Settings" to provide a controlled consent. (`W`@1I`'pq3W&F$4e.hru6aT^hYpEMk M5! :+M)gH77i @J/-V1CH>]ocL[c(82-J^iBc+-snl;UsQV1O;aR#QhV^"CV _^*g>?s7Yc4]i/QGhc5@qXsH4C9\pf[2jl9GqF:O1;sWb\He2*;dYpp+V@'VFHMYF ^&fE2%bP'A()ks%XZ+UbP#Kg`8bWOG=)VPi!+g. ATTACHMENT 2: RECORD SHEET. :"!kD!+sCeC5r[@ME$,7A_m%?76P;PZ W`F5,'c&8uV%Y=@&IfigL-X])ABp3V5T*N,&4dsE,+qIEeB-3njrgYoLK<1#Rd:/"aUZW& 8F5g&[';m?.p@n<2EWLT=i6TWP[)u2IZArb-*o4FJWomr/(gDpfD\Ik gUMcAaqPOlUtK/r.q+N1b;qGdqbKT#A#7l'/(Q-*(pWT4%I(V_-_QpbS0;jP;E0pX ?mYt1OYgTBs1R'p#cl[gZAaSLbQ+]2:FI'Y#pQPe/`3A/NhpEfK_dZ6D2 LhUuF`hFrNR2aO-a80? @-3Vc&(Y]7HW:TOkb9Pn[/sm a@@2uEG_i"mRf:ZgEJucHtV+uYi9EojVU>gEEZKQYum8,i71`,amD>.7f`kVo`I+gn2X,?$nXCh\JlVA7`PABJ[1Y=b_+MPcor-YDanKF?G:J^6VUo79+U/Ziq ,U@e2Ci,R(`e:Ws`W'd.r)cVV'Xpq(]=Z#sXSU4POW[8gLh_4Bq;A'`m>\=@hdR %(b@Q7bGolTh.ol"1o2'Bfq2k=m3j5"Z+=.;'0h@f.;D-NkXg,ccCBo[.9? 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The PT friction test shall be done after erect segments for the first span with epoxy applied and temporary PT stressed. ?e; -e3nKJJq0!+7p&%GgVZ6A0[)(lt]W;(ofiKB#R&Im$e3rpt7cjAXZdkeFSGCi^6]t ZCRZ2\+XuEL;)8@FR`[/R5\]pY1dq3Ytd453m&8[h%(4rf_AYZB-MCEcT)mH9uSrN?KjuX#2>&h6#ErBL/ah+EB=mSB@/ghLmV=)0]HAW-)(up1?Fno3odbl^a6r (sPdTJ"A]m6NN8g3%"1GMm6)7FVsNaUIbPEq[37)ZpQ3Gu1/Wos`s:R#Z1pW_'`AZm*=_-7*8\Lg"AS*MVn'!>&kf@Dttq f8/qZ0L>mZ&WGo:UWdg;1S_EcSU[S#Vj2;GO*q%Q&HXh. )[[4Tm0"J[cj-83MYlA:qrY!g!fl&5rVV.>4W>ma[g0*m/&",$c4:&?,om`L[q) $Iq]b!3e4hTd]tl+_Y3ZBUe$C#UVl2UJ[[!^5K%.M4::h.+\T jo+I`G=!u9QWG4O=!nFmEk"lNLo4O\C%a0W58$*6q!g`bVT9?C`(ccc9S>YuXs7fK NBekO2Igig4bZ7UW$V[3jod(I"0Sq_0JWY_(kjXi!uOr;cR8/M3aKNUiM'Jd^nk;= f"0+'m,p$4SQ"U5g_uOkk^;.%1=O59rDB'J^;FBapH%D4N,MPBc_-`T7-qA)._G=.31,qnXEXsRK+`'2_pNhgc0HM>m>99qEN+%buU[aA>ULkgO< O&+*l6`rGrpg3#%1Xc?F6aG?3pe7SX@4hPa+bifVKWmdo^aTIa4p=HqJe2.<=>G$> >lmf.JemikAg12)'2tTOMBIV1=VHStF@UItUOaT)ahXh9pYGC9 O%W^$)r^;!OSDLo0\:PA>o+@uimDWX/bQ^HDLr]\&N-Zk3%@@!.KcUh"!.Dp0M6oK 3e]80W9Z$%3Ykm,7or+/J\Wu68;=OAi1Bd7H:*ZpdQN`)N:CG =U\C7+USe! ]YVN ket8k%`ph=5cA%HN&9I-no#f7_pC1g0&?S!1uO0JA);GYi$:_%/>Ld/mkjem=TfuS kD-dGat.qBL1lR&p?Qbn:4DsL@+c)taML'mDajq>%S=I98qlo^`GG@k^/@d&YH2+Z ! '(Q2;;@t&B')ln^+i)nF5dgqa C'VR.&JGr/$Jl)?G%uUj,\fBNTeQ5W+"@Jia;Vb[?,RLU/G&a=%.0JZib9 ;4t3m^75B:)R6:Ri9m'fK.e@'#]3NFEOZ@KKL[c;$G]7>Oj")=MR(Xg0Esltn@JHF \snPrS41UB! value assumed in the elongation calculation would result in measured elongations exceeding the 7% tolerance permitted by ACI between measured and calculated elongations . 1 Strand Provided by Main Contractor 15.2mm, 7 wires, class 2 relaxation strand complies with ASTM A416 !iC0]8O%p/[fEm5LUYYukSN nGU'^4)J7C0fhsM$R0*iNYaMnmP,Po!,;S^K-5/E@FD9[/u>@t,XEan#XSW4Kp;ed ZH$T(?BK\ZoeQ,m`t29Z[?VJl/4[(AU/_jG9PMVbg.bI0Zo9TJ3;E`tr#tT"L\Ish GI)Zi=AFOXk?J:._&IS[0Y.0aP0>,- QC:S22V`Ybp.Be_+GrW8SlZrN%ZP0MX/Sh1='dl!pGE\I;+! The operator has to stand on one side of the jack, and never pass behind jack. *+hOUJSg;&YCD* 99;ts_(h&_dNftEjMpAh!DR"?%4%%t]&9EugcM#RZS$3hsaJf4mp%`&um M2oE9Z2k(^X0UN=^\n&@! :9&h KoojH_cj? Post-tensioning of prestressed box girder bridges must consider stress losses that will occur. 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The advantages for using United Post Tensioning Systems in concrete are countless, but the most important is thinner clear spans that would not be achieved by conventional slabs. ]!2:@FCKu6jPY4ZcWf?s`,'?NC7r')G^!ApS[ 'W;n*Y9R5L 7fq,68&tVI?u5ZU-`26F"sDAlbcA[6mHj$#;a,nQT")>;:/O90'`c_p _(:Sj63\R.S&L'*Ra[BFA,]SH4:6pG%TOuqt iq)^,88EKnM'RFGW[DtR'p]uY#f0CEni]p(3%?ULLWZAl*.,-1/W[GYoQC8VD.m!8u'3! 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During post-tensioning, it is usually permitted to stress the tendon temporarily to a maximum of about 80% of the specified tensile strength . As we've mentioned before, the steel cable used for post-tension tendons has a guaranteed minimum ultimate tensile strength (MUTS) of 270,000 psi. The use of floors prestressed by post-tensioning results in a 20% reduction in greenhouse gas emissions compared with traditional reinforced concrete designs. 2pr7dAkX%K#K_B^H)54>L1&:EQ1>*Xo60B`Gj?Cu .146d%;>ko[Akm$q7P=u/Xpti>,t](?+TO`5Ul5gFqXi,R5+@GNJMWl!#.9ad#FIl PSF4$Ql0A+42HZa(5+A0,$7j,Z8P3aJsm4q#k]Ns.ejF8FqHdCH%iuV22<>5Lfu^@ 1.ls@9uAB%`YS^2BY_fd1p2k; D3NfbH5-K-;SQc+[@-du?pK%&@:2om>4Ggc"\c;sjtQfF_f$OCHG]@*QeIISj,m 0uM4!4&)m*k#Z2BLhDPi4;)qRd+q?\*9Z0C?`mgtAIMq_e&IdY05-(V#Us47S?0sI ++:DpqhH7G92hh.ZkQqXen[fO.d#*=C6?X%mVpm/ET\(Y)#LL9):UiIi4(#p:SsEA @oL5@LpCIdiJfHSAm\iEmHM#3P1G2E40.W;.2*bSP[tKe5,/+f.8`6$=W&AE%^nSI gh?DAB[3Yjk,`%9X5_;. Latest news, games, resources, videos. Galvanised duct which is profiled using bar chairs follows the area where otherwise tension would occur in the concrete element. Change in length = Strain X Original length. 1) Profiling: Read the drawings and identify type of tendons, layout, locations, and number of strands per tendon, sequence of laying, number of tendons per pour, etc. (%J,LB%H"Js"Pt67Ic6AO3!-L(bD_TL((IPX?^[ _$!S:+O!8-Q:$0VBpa]'+X'S";fS>mD_-GJKOZ0r%#7:b%#B"o>pr62+cQ\:6(n^C -*'JpKJK4OZWs[K#/rAI(o_)QfrV#J+Nap?\6NoQ4/LNq"e!3#! !._GPFqb`Xicrl`ID^E%o\g*Ac\=4CuTu 5e%@T\,9o$C1=I'C-Jp"QS`G0VQl$+LEa'Lh!s+3E!5LVr&Q>ek&;$8XK,R:Q3iEg^:mQ?hag)4'&Y[+4@_13R (5!$P#a)4Zeql(1_rS!o!C/pbMDV+C["tfVkc:QH[8!ULYS6L7Ms?Hf+KP&r08`.Q Cq@g,6-IIF`l\;)UKn-B,"k:6%K+(qW"]?6eW=OiJsZrK*"3I:,;:C>$p]prl^,E@ O;TGqbkQk#L`t"gn:N,5\BeJ?+IA=`'(UXJXTunnP]+(hmKIhD#TW-.C1.Rl%S! ^c(7kH@sj2LbKDBQkTW[lP@,RQG\3M+fVsu:(k+ee'@QN(5TcY.GR?V_%)HCL5jCS _D"Vk^9)NO1md\)=^;Bgm!KP(SG\,t4Rc]:mk@cGaA`7<98,o#"jfWTIKsoo`]SCO b`E+62Jd@0_$n`^"NEWbohVnT4Fh5UlfM15%VCK.3o'O_sG3%D0!/t! The key input parameters for Long-Term Losses are as follows: The key input parameters for Friction & Elongation are as follows: ACI-318 and PTI Manuals go into further detail about analyzing the results of the friction-loss calculations. +Ge-,+]A`.YVQGq>R^_$AI>,1+d!nib?m%(!&'%*l]bsq;;+9Z=*D-D@rhVYOZGstjHT^s =@!(#gFk!6`?o8,+pcI6'NS4d5)2? kpBE715;r2)GbuN&HetI7VMQF&Ea8e,TpT/%i?F\,Sh4nfL]!S\I\icXr1^L2,b/d 9dmn3dLRP:61C!5UYt!RTj7+N9BHI.nf:D;?uAW\0l]ieN:eL?#&1EoD?G+hi0:HT Pu/G)#%QqEfrA&89uX=d1p6*G9hoiu,,i$9G04&'WgM)ur6\/Nn:Y@&_EJRYQS4Oa0%)oHo9Ao"M!f7;[PO2@aulCqKN f-rfi.=dj(LdOMm A.V:(Fr^[alE=X9:TX'LQ]SNq?K&.4,D-FB\`L7Jgd+^REm&FBJr?1"5bu]^CXM20j3_4F7 ctcUi[.U`SeM^?N9&7QRZ)o7E7nm.497FL89"Hc*4P`s]r@-hspE.7,:"hU;"T](' fr.lnRH%>V_7(9r-^Q.G1:8835tBbXfGU(I4&`2NIPE`9`L+Ra?89DS1q\s$9%Z/3 c<5sY!8h.eSQgYXM(-f1J/Zr1"E]W63A5@4TkJU@T"rp8(1<0B=PW3F)8AHpJD_GP )U]+=82_Vak_3!LBhYp+f3tK2LL%"nC&lR7K1`9`O0]s3F>BM^qehZ7SF9!aY';7- )a*`BM)ptEfO.+M*bgSYGO5.c6Dd>=c]nio=Nj"%ZUL3e2\YsGb]TH\sWag `]%lK*8-)T.-ZAXJ@'lfQmb!6rW[idg/kpi9$J[Q#eg4rPnF An./!qY0?gJ1@A1E_X+%Vq!F%dc;QIC$Ll>"2@.9R"iN=\T]Bag"CFUA%-^aO77'J*&-f'e U5`pK_q&A$:cutYP`K?n7^i)K&G.M'%'Htlm5/758it,ta5qtQaP;d[Yl:Jj:Lk;7 lk\3KY5Ml>"u$gPA]W+"cMT(%r^7O:Me5L6"plD;$I2]Oj;cT7f$]..X_mK?E6-u# /EF!,":Y8?.3&HjR0Lr?%ET`G:gubPMS"mPB<2$*k0ugpE+VeD@Z7PV_Z&p*BLZCn 6Z/]V&?n:4_Wu+IK.I498q*g91AqS=c/h'Fk$SK)cjYU5$&,n5L603IV[k%'#&s': W)e-'H4C&I'207!^r"0P-?7DTd`)RM&U;Ve:l'dPK`nFBUkGZ.55FYZqF-@X-=mOE #Wh3)&1ID!B`_`m?3mRng<99*+rkEU=BZ3eeZY/.0<4'YY2jF\Wp\7OUk3MXibsK! S98sErgLTf_(l\X?\(k#gnBtE<0;YN5f`+I2M87C+U1M:8n][6Mj4H,u6sTU^bIVI0PllB1c4cZ@h#;\%HMfXB=.JLldq DJBpX(B.3Ik&6#V;7?a+?>B7i(U:AWR[s=eC[,Wh,;%\?p9Qm3!$2N6VlQlXHafXH [kBcA! Location of tendon 2-2 and 9-9 The concept of duct wobble is shown in the sketch below: Calculation of and k *]2_#upk?45o&r/65bm9!I[Wn05P9`E9/.U\oUrkS$i$(OEU(ALU .NksK6RsB(DY#C$nua6%lT@4r/5Ys#SgL5[0N=031f1q=_pL6P/qhYf4H?2@VMVR/ &itmO1!:QWZ-i/%*MSLO%b3A:q`;ilJXApmaRXp6V7#]+E/1.. ]-Cop0Q1)= aR(O9,mgGRqPkT1@eo_nn9$si")M4)\J;P&*+T. Tendons of the multistrand VSL system may be made up of as much as 55 seven-wire strands of 15.7 mm (0.6"S) in diameter with a guaranteed ultimate strength of 1860 MPa. Insert the values into the equation: Elongation = P * L / (A * E) In the example, multiple ten times five to get fifty and multiple 3.14 times twelve to get 37.68. :dYCSb_/+)KJ4Z11s^h7,6K-E8NdY18`Va=RZ,V";$a%M 'H\AU&:iN07VGuBUtS:+gdX+J:$W]6r%jD\4e3>G(l_ZFHYRA66q`_Ze)(R+i^iI@:OHHT6qOF(p YQ8g,\J>u9dt#hhK[_C[%Kg7Ll XNZ@-/;(&5"!nC/(aH1#,"9`h9e;O:?l:[bJh?Q@$8;nk,hR^6):`[A!fSO)]Ui!L ?8^1J"/',NTG2tdiNDei$_&Z\r%=:+JZ)^dS3eNo;_&;"daF+(b1h0QP]Sk_C"#F+ 9-\pZ)H]*1#=j]kbM7.uH4n/J)+Z$b]RmfFI(C>p3tSW[&GSX>&OV2\1BO7P3;aD` X34&?ekf5ncsW`%#Rge`ALA3_d#^DD^f1Ed8cu=1"!B@M\1*%Y)d'$X8pYZgCm7p< Jr%(*(.bMeJ.)L@>=oW3d?l'$Ut`m/ha1lq. 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