后張法預(yù)制T梁鋼絞線張拉伸長量計(jì)算

1、.后 張 法 預(yù) 制 T 梁 （30m）鋼絞線張拉伸長量計(jì)算書長深高速公路LJ4標(biāo)后張法預(yù)制T梁鋼絞線張拉伸長量計(jì)算遵化南互通板梁預(yù)制廠位于遵化南互通區(qū)內(nèi)，占地23畝。預(yù)制廠內(nèi)設(shè)26個(gè)后張法T梁臺(tái)座，負(fù)責(zé)生產(chǎn)302片T梁。所有T梁均采用C50砼澆筑。預(yù)應(yīng)力鋼絞線采用GB/T5224-2003標(biāo)準(zhǔn)的高強(qiáng)低松弛15.2mm預(yù)應(yīng)力鋼絞線。鋼絞線標(biāo)準(zhǔn)強(qiáng)度=1860Mpa。所有預(yù)應(yīng)力鋼絞線采用張拉和伸長值雙控張拉施工，張拉控制應(yīng)力按設(shè)計(jì)施工圖正彎矩采用=0.73×=0.73×1860 Mpa=1357.8 Mpa。根據(jù)天津市市政公路材料試驗(yàn)管理局試驗(yàn)中心的檢測結(jié)果，我部進(jìn)場的鋼絞線彈

2、性模量為=1.95×105Mpa，單根公稱截面積為Ay=1357.8×103×140×10-6=190.09KN。T梁的張拉施工工藝及計(jì)算數(shù)據(jù)如下。一、 張拉施工工藝及程序：根據(jù)公路橋涵施工技術(shù)規(guī)范和設(shè)計(jì)圖紙規(guī)定，張拉施工控制采用張拉和伸長值雙控方式很圓錨整體張拉、扁錨單根張拉的施工工藝。張拉施工程序如下：低松弛預(yù)應(yīng)力鋼絞線0初應(yīng)力（持荷兩分鐘）錨固，即用兩個(gè)150t千斤頂兩端同時(shí)張拉，初應(yīng)力為的10%，此時(shí)的伸長值為，其值采用相鄰級(jí)的伸長值?？刂茝埨瓚?yīng)為=0.73×=0.73×1860 Mpa=1357.8 Mpa即為末張的應(yīng)力值。

3、其中伸長值=，為開始至初張的伸長量，為初張至末張間的伸長量。張拉完畢后，與計(jì)算伸長值比較，其伸長值誤差不應(yīng)超過6%，否則應(yīng)停止張拉，查明原因。二、 計(jì)算參數(shù)：1、15.2鋼絞線的彈性模量：=1.95×105Mpa2、15.2鋼絞線的張拉控制應(yīng)力：正彎矩：=0.73×=0.73×1860 Mpa=1357.8 Mpa3、孔道摩阻系數(shù)：=0.254、孔道每米局部偏差對(duì)摩擦的影響系數(shù)：k=0.0015三、 張拉伸長量計(jì)算：1、 計(jì)算公式： 式中： P·········鋼絞線張拉力

4、·········預(yù)應(yīng)力鋼絞線的計(jì)算伸長量 L·········預(yù)應(yīng)力鋼絞線的長度·········預(yù)應(yīng)力鋼絞線的彈性模量·········鋼絞線的截面積簡化計(jì)算式：······&

5、#183;··鋼絞線平均張拉力， ·········預(yù)應(yīng)力鋼絞線的計(jì)算伸長量 L·········預(yù)應(yīng)力鋼絞線的長度·········預(yù)應(yīng)力鋼絞線的彈性模量·········鋼絞線的截面積2、 張拉伸長量計(jì)算表：30米T

6、梁邊跨邊梁鋼束編號(hào)孔道長度（米）工作長度（米）鋼絞線根數(shù)（根）夾角（rad）（m）正彎矩N129.591.270.12217300.96345370.206866N229.5531.270.11344640.96451870.206836N329.5131.270.11344640.96454730.206566N429.4731.270.11344640.96457590.20630630米T梁邊跨中梁鋼束編號(hào)孔道長度（米）工作長度（米）鋼絞線根數(shù)（根）夾角（rad）（m）正彎矩N129.591.270.12217300.96345370.206866N229.5531.270.113446

7、40.96451870.206836N329.5131.260.11344640.96454730.206566N429.4731.260.11344640.96457590.20630630米T梁中跨邊梁鋼束編號(hào)孔道長度（米）工作長度（米）鋼絞線根數(shù)（根）夾角（rad）（m）正彎矩N129.551.270.12217300.96348220.206596N229.511.270.11344640.96454730.206566N329.4731.260.11344640.96457590.206306N429.4331.260.11344640.96457590.20604630米T梁中跨中

8、梁鋼束編號(hào)孔道長度（米）工作長度（米）鋼絞線根數(shù)（根）夾角（rad）（m）正彎矩N129.551.260.12217300.96348220.206596N229.511.260.11344640.96454730.206566N329.4731.260.11344640.96457590.206306N429.4331.260.11344640.96457590.206046四、預(yù)應(yīng)力T梁控制張拉力計(jì)算：1、邊跨邊梁N1、N2、N3、N4，邊跨中梁N1、N2，中跨邊梁N1、N2：FK= ×n×=0.73×1860×103×7×0.1

9、40×10-3 =1330.644KN2、邊跨中梁N3、N4，中跨邊梁N3、N4，中跨中梁N1、N2、N3、N4：FK= ×n×=0.73×1860×103×6×0.140×10-3 =1140.552KN五、 張拉數(shù)據(jù)表：1、 邊跨邊梁N1，邊跨中梁N1正彎矩鋼絞線：分級(jí)張拉順序平均張拉力（KN）控制張拉力（KN）張拉控制應(yīng)力（Mpa）油表讀數(shù)伸長量（cm）備注8384858610%張拉力128.20133.06135.784.33.74.24.22.0720%張拉力256.40266.13271.568.57.

10、88.48.44.1440%張拉力512.81532.26543.1216.916.216.816.78.2760%張拉力769.21798.39814.6825.324.525.225.112.4180%張拉力1025.611064.521086.2433.632.933.733.516.55100%張拉力1282.011330.6441357.842.041.242.141.820.692、 邊跨邊梁N2、邊跨中梁N2正彎矩鋼絞線：分級(jí)張拉順序平均張拉力（KN）控制張拉力（KN）張拉控制應(yīng)力（Mpa）油表讀數(shù)伸長量（cm）備注8384858610%張拉力128.34133.06135.78

11、4.33.74.24.22.0720%張拉力256.69266.13271.568.57.88.48.44.1440%張拉力512.37532.26543.1216.916.216.816.88.2760%張拉力770.06798.39814.6825.324.525.225.112.4180%張拉力1026.741064.521086.2433.632.933.733.516.55100%張拉力1283.431330.6441357.842.141.242.241.920.693、 邊跨邊梁正彎矩鋼絞線（N3）：分級(jí)張拉順序平均張拉力（KN）控制張拉力（KN）張拉控制應(yīng)力（Mpa）油表讀數(shù)伸

12、長量（cm）備注8384858610%張拉力128.35133.06135.784.33.74.24.22.0720%張拉力256.69266.13271.568.57.88.48.44.1340%張拉力513.39532.26543.1216.916.216.816.88.2760%張拉力770.08798.39814.6825.324.525.325.112.3980%張拉力1026.781064.521086.2433.732.933.733.516.52100%張拉力1283.471330.6441357.842.141.242.241.920.664、 邊跨邊梁正彎矩鋼絞線（N4）：

13、分級(jí)張拉順序平均張拉力（KN）控制張拉力（KN）張拉控制應(yīng)力（Mpa）油表讀數(shù)伸長量（cm）備注8384858610%張拉力128.35133.06135.784.33.74.24.22.0620%張拉力256.7266.13271.568.57.88.48.44.1340%張拉力513.40532.26543.1216.916.216.816.88.2560%張拉力770.10798.39814.6825.324.525.325.112.3880%張拉力1026.811064.521086.2433.732.933.733.516.50100%張拉力1283.511330.6441357.8

14、42.141.342.241.920.635、 邊跨中梁正彎矩鋼絞線（N3）：分級(jí)張拉順序平均張拉力（KN）控制張拉力（KN）張拉控制應(yīng)力（Mpa）油表讀數(shù)伸長量（cm）備注8384858610%張拉力110.01114.06135.783.73.13.63.62.0720%張拉力220.02228.11271.567.36.77.27.24.1340%張拉力440.05456.22543.1214.513.814.414.48.2660%張拉力660.07684.33814.6821.721.021.721.512.3980%張拉力880.09912.441086.2428.928.128.

15、928.716.52100%張拉力1100.121140.5521357.836.135.336.135.920.666、 邊跨中梁N4，中跨邊梁N3，中跨中梁N3正彎矩鋼絞線：分級(jí)張拉順序平均張拉力（KN）控制張拉力（KN）張拉控制應(yīng)力（Mpa）油表讀數(shù)伸長量（cm）備注8384858610%張拉力110.01114.06135.783.73.13.63.62.0620%張拉力220.03228.11271.567.36.77.27.24.1340%張拉力440.06456.22543.1214.513.814.414.48.2560%張拉力660.09684.33814.6821.721.

16、021.721.512.3880%張拉力880.12912.441086.2428.928.128.928.716.50100%張拉力1100.151140.5521357.836.135.336.135.920.637、 中跨邊梁正彎矩鋼絞線（N1）：分級(jí)張拉順序平均張拉力（KN）控制張拉力（KN）張拉控制應(yīng)力（Mpa）油表讀數(shù)伸長量（cm）備注8384858610%張拉力128.21133.06135.784.33.74.24.22.0720%張拉力256.41266.13271.568.57.88.48.44.1340%張拉力512.82532.26543.1216.916.216.81

17、6.78.2660%張拉力769.23798.39814.6825.324.525.325.112.3980%張拉力1025.641064.521086.2433.632.933.733.516.52100%張拉力1282.051330.6441357.842.041.242.141.820.668、 中跨邊梁正彎矩鋼絞線（N2）：分級(jí)張拉順序平均張拉力（KN）控制張拉力（KN）張拉控制應(yīng)力（Mpa）油表讀數(shù)伸長量（cm）備注8384858610%張拉力128.35133.06135.784.33.74.24.22.0720%張拉力256.69266.13271.568.57.88.48.44

18、.1340%張拉力513.39532.26543.1216.916.216.816.88.2660%張拉力770.08798.39814.6825.324.525.325.112.3980%張拉力1026.781064.521086.2433.732.933.733.516.52100%張拉力1283.471330.6441357.842.141.242.241.920.669、 中跨邊梁N4,中跨中梁N4正彎矩鋼絞線：分級(jí)張拉順序平均張拉力（KN）控制張拉力（KN）張拉控制應(yīng)力（Mpa）油表讀數(shù)伸長量（cm）備注8384858610%張拉力110.01114.06135.783.73.13.

19、63.62.0620%張拉力220.03228.11271.567.36.77.27.24.1340%張拉力440.06456.22543.1214.513.814.414.48.2460%張拉力660.09684.33814.6821.721.021.721.512.3680%張拉力880.12912.441086.2428.928.128.928.716.48100%張拉力1110.151140.5521357.836.135.336.135.920.6010、 中跨中梁正彎矩鋼絞線（N1）：分級(jí)張拉順序平均張拉力（KN）控制張拉力（KN）張拉控制應(yīng)力（Mpa）油表讀數(shù)伸長量（cm）備注8

20、384858610%張拉力119.89114.06135.783.73.13.63.62.0720%張拉力219.78228.11271.567.36.67.27.24.1340%張拉力439.56456.22543.1214.513.814.414.48.2660%張拉力659.34684.33814.6821.720.921.621.512.3980%張拉力879.12912.441086.2428.828.128.928.716.52100%張拉力1098.901140.5521357.836.035.336.135.920.6611、 中跨中梁正彎矩鋼絞線（N2）：分級(jí)張拉順序平均張拉

21、力（KN）控制張拉力（KN）張拉控制應(yīng)力（Mpa）油表讀數(shù)伸長量（cm）備注8384858610%張拉力110.01114.06135.783.73.13.63.62.0720%張拉力220.02228.11271.567.36.77.27.24.1340%張拉力440.05456.22543.1214.513.814.414.48.2660%張拉力660.07684.33814.6821.721.021.721.512.3980%張拉力880.09912.441086.2428.928.128.928.716.52100%張拉力1100.121140.5521357.836.135.336.135.92