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1、30mT梁預(yù)制預(yù)應(yīng)力張拉油壓表計算書1、工程概況本合同段共有13座大中橋梁,12座橋梁上部結(jié)構(gòu)形式均采用先簡支后連續(xù)預(yù)應(yīng)力T梁結(jié)構(gòu),單幅橋面寬12.25m(包含左右側(cè)0.5m防撞墻寬度),由5片T梁架設(shè)及4個濕接縫澆筑組成。全線30mT梁555片,40mT梁161片,T梁理論梁長30(40)m,梁肋中心線間距2.4m,梁高2.0(2.5)m,中梁梁寬1.7m,邊梁梁寬2.05m,混凝土強度等級為C50,T梁集中在1個預(yù)制場預(yù)制,T梁架設(shè)由梁場從大小里程兩端分別架設(shè),小里程端390片30mT梁,大里程端165片30mT梁及161片40mT梁。預(yù)應(yīng)力
2、鋼絞線采用抗拉強度標準值為fpk=1860MPa,彈性模量為Ep=1.95×105MPa,公稱直徑為15.2mm的高強度、低松弛鋼絞線,其技術(shù)條件符合GB/T5224標準,波紋管采用金屬波紋管。2、計算過程根據(jù)橋梁通用圖,預(yù)應(yīng)力鋼絞線采用抗拉強度標準值為fpk=1860MPa,彈性模量為Ep=1.95×105MPa,公稱直徑為15.2mm的高強度、低松弛鋼絞線,張拉控制應(yīng)力0.75fpk(1395MPa)。根據(jù)預(yù)應(yīng)力鋼絞線檢測報告及我國現(xiàn)行15.2mm鋼絞線的技術(shù)規(guī)范:單股鋼絞線有效截面積A=140mm2,11束鋼絞線A11=140×11=154
3、0mm2;10束鋼絞線A10=140×11=1400mm2;9束鋼絞線A9=140×11=1260mm2;8束鋼絞線A8=140×8=1120mm2。當(dāng)張拉控制應(yīng)力為100%時,邊跨邊梁N1鋼絞線兩端張拉力FN1=N1*A11=1395×1540÷1000=2148.3KN;N2鋼絞線兩端張拉力FN2=N2*A10=1395×1400÷1000=1953KN;N3鋼絞線兩端張拉力FN3=N3*A10=1395×1400÷1000=1953KN;當(dāng)張拉控制應(yīng)力為100%時,邊跨中梁N1鋼絞線兩端張拉力FN1=N1*A9=1395×1260÷1000
4、=1757.7KN;N2鋼絞線兩端張拉力FN2=N2*A9=1395×1260÷1000=1757.7KN;N3鋼絞線兩端張拉力FN3=N3*A9=1395×1260÷1000=1757.7KN;當(dāng)張拉控制應(yīng)力為100%時,中跨邊梁N1鋼絞線兩端張拉力FN1=N1*A10=1395×1400÷1000=1953KN;N2鋼絞線兩端張拉力FN2=N2*A9=1395×1260÷1000=1757.7KN;N3鋼絞線兩端張拉力FN3=N3*A9=1395×1260÷1000=1757.7KN;當(dāng)張拉控制應(yīng)力為100%時,中跨中梁N1鋼絞線兩端張拉力F
5、N1=N1*A9=1395×1260÷1000=1757.7KN;N2鋼絞線兩端張拉力FN2=N2*A8=1395×1120÷1000=1562.4KN;N3鋼絞線兩端張拉力FN3=N3*A8=1395×1120÷1000=1562.4KN;根據(jù)“千斤頂標定報告”中千斤頂出力值X(KN)-油壓Y(MPa)關(guān)系方程。當(dāng)千斤頂編號為D712036;油壓表編號為C1203066時,Y=0.02318X-0.33,于是得到以下結(jié)論:邊跨邊梁N1鋼絞線:10%FN1時油壓表讀數(shù):Y=0.02318(2148.3×0.1)-0.33=4.65MPa;20%F
6、N1時油壓表讀數(shù):Y=0.02318(2148.3×0.2)-0.33=9.63MPa;100%FN1時油壓表讀數(shù):Y=0.02318×2148.3-0.33=49.47MPa;N2鋼絞線:10%FN2時油壓表讀數(shù):Y=0.02318(1953×0.1)-0.33=4.20MPa;20%FN2時油壓表讀數(shù):Y=0.02318(1953×0.2)-0.33=8.72MPa;50%FN2時油壓表讀數(shù):Y=0.02318(1953×0.5)-0.33=22.30MPa;100%FN2時油壓表讀數(shù):Y=0.02318×1953-0.33=44.94MPa
7、;N3鋼絞線:10%FN2時油壓表讀數(shù):Y=0.02318(1953×0.1)-0.33=4.20MPa;20%FN2時油壓表讀數(shù):Y=0.02318(1953×0.2)-0.33=8.72MPa;100%FN2時油壓表讀數(shù):Y=0.02318×1953-0.33=44.94MPa;邊跨中梁N1鋼絞線:10%FN1時油壓表讀數(shù):Y=0.02318(1757.7×0.1)-0.33=3.74MPa;20%FN1時油壓表讀數(shù):Y=0.02318(1757.7×0.2)-0.33=7.82MPa;100%FN1時油壓表讀數(shù):Y=0.02318×1757
8、.7-0.33=40.41MPa;N2鋼絞線:10%FN1時油壓表讀數(shù):Y=0.02318(1757.7×0.1)-0.33=3.74M