20米箱梁预应力张拉伸长量计算
钢铰线强度:1860MPa 控制应力:1860×0.75=1395 MPa
钢铰线公称面积:140 mm2
单根控制力:1395×140.0=195300 N
伸长量计算公式:△L=Pp×L÷(Ap×Ep)
一、 中跨
1#束
①直线段长 0.537米 ②竖曲线段长 L=π÷180°×a×R=3.1415926÷180°×5.5°×30.0=2.880米 ③直线段长 4.869 米 ④平曲线段长 L=π÷180°×a×R=3.1415926÷180°×1.8°×25.0=0.785÷COS5.5°=0.789 ⑤直线段长 0.728米 ⑥工具段长 0.74米(由于箱梁板顶预埋筋影响,千斤顶不能靠近锚环,为不弯曲板顶预埋筋,需增加一个过渡环,具体尺寸为:锚环0.046m+限位板0.035m+过渡环0.25m+千斤顶0.363m+锚环0.046m=0.74m)
Pp=P×(1-e-(kx+μθ))÷(kx+μθ)
Pp=P=195300 N Ep=198 GPa
得:
⑥的伸长量:
e=2.718281828 k=0.0015 x=0.74 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×0.74))÷(0.0015×0.74)
=195191.52 N
195191.52×740÷(140×198000)=5.21mm
⑤的伸长量:
e=2.718281828 k=0.0015 x=1.468 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×1.468))÷(0.0015×1.468)
=195085.00 N
195085.00×728÷(140×198000)=5.12mm
④的伸长量:
e=2.718281828 k=0.0015 x=2.257 μ=0.25
θ=1.8°×0.017453293=0.03142
195300×(1-2.71828-(0.0015×2.257+0.25×0.03142))÷(0.0015×2.257+0.25×0.03142)=194206.34 N
194206.34×789÷(140×198000)=5.53 mm
③的伸长量:
e=2.718281828 k=0.0015 x=7.126 μ=0.25
θ=1.8°×0.017453293=0.03142
)195300×(1-2.71828-(0.0015×7.126+0.25×0.03142))÷(0.0015×7.126+0.25×0.03142)
=193500.19 N
193500.19×4869÷(140×198000)=34.00mm
②的伸长量:
e=2.71828 k=0.0015 x=10.006 μ=0.25
θ=7.3°×0.017453293=0.12741
195300×(1-2.71828-(0.0015×10.006+0.25×0.12741))÷(0.0015×10.006+0.25×0.12741)=190794.5 N
190794.5×2880÷(140×198000)=19.82mm
①的伸长量:
e=2.718281828 k=0.0015 x=10.543 μ=0.25
θ=7.3°×0.017453293=0.12741
195300×(1-2.71828-(0.0015×10.543+0.25×0.12741))÷(0.0015×10.543+0.25×0.12741)=190718.28 N
190718.28×537÷(140×198000)=3.69mm
1#束的伸长量为:
5.21+5.12+5.53+34.0+19.82+3.69=73.37×2=146.74 mm
2#束
①直线段长 2.015米 ②竖曲线段长 L=π÷180°×a×R=3.1415926÷180°×5.5°×30.0=2.88米 ③直线段长 3.408 米 ④平曲线段长 L=π÷180°×a×R=3.1415926÷
180°×1.8°×25.0=0.785÷COS5.5°=0.789 ⑤直线段长 0.728米 ⑥工具段长 0.49米(锚环0.046m+限位板0.035m+千斤顶0.363m+锚环0.046m=0.49m)
Pp=P×(1-e-(kx+μθ))÷(kx+μθ)
Pp=P=195300 N Ep=198 GPa
得:
⑥的伸长量:
e=2.718281828 k=0.0015 x=0.49 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×0.49))÷(0.0015×0.49)
=195228.11 N
195228.11×490÷(140×198000)=3.45 mm
⑤的伸长量:
e=2.718281828 k=0.0015 x=1.218 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×1.218))÷(0.0015×1.218)
=195121.57 N
195121.57×728÷(140×198000)=5.12mm
④的伸长量:
e=2.718281828 k=0.0015 x=2.007 μ=0.25
θ=1.8°×0.017453293=0.03142
195300×(1-2.71828-(0.0015×2.007+0.25×0.03142))÷(0.0015×2.007+0.25×0.03142)=194242.69 N
194242.69×789÷(140×198000)=5.53 mm
③的伸长量:
e=2.718281828 k=0.0015 x=5.415 μ=0.25
θ=1.8°×0.017453293=0.03142
195300×(1-2.71828-(0.0015×5.415+0.25×0.03142))÷(0.0015×5.415+0.25×0.03142)=193747.94 N
193747.94×3408÷(140×198000)=23.82 mm
②的伸长量:
e=2.71828 k=0.0015 x=8.295 μ=0.25
θ=7.3°×0.017453293=0.12741
195300×(1-2.71828-(0.0015×8.295+0.25×0.12741))÷(0.0015×8.295+0.25×0.12741)=191037.63 N
191037.63×2880÷(140×198000)=19.85 mm
①的伸长量:
e=2.718281828 k=0.0015 x=10.31 μ=0.25
θ=7.3°×0.017453293=0.12741
195300×(1-2.71828-(0.0015×10.31+0.25×0.12741))÷(0.0015×10.31+0.25×0.12741)=190751.34 N
190751.34×2015÷(140×198000)=13.87 mm
2#束的伸长量为:
3.45+5.12+5.53+23.82+19.85+13.87=71.64×2=143.28 mm
3#束
①直线段长 7.901米 ②竖曲线段长 L=π÷180°×a×R=3.1415926÷180°×1.4°×30.0=0.733米 ③直线段长 1.065 米 ④工具段长 0.74米(由于箱梁板顶预埋筋影响,千斤顶不能靠近锚环,为不弯曲板顶预埋筋,需增加一个过渡环,具体尺寸为:锚环0.046m+限位板0.035m+过渡环0.25m+千斤顶0.363m+锚环0.046m=0.74m)
Pp=P×(1-e-(kx+μθ))÷(kx+μθ)
Pp=P=195300 N Ep=198 GPa
得:
④的伸长量:
e=2.718281828 k=0.0015 x=0.74 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×0.74))÷(0.0015×0.74)
=195191.52 N
195191.52×740÷(140×198000)=5.21 mm
③的伸长量:
e=2.718281828 k=0.0015 x=1.805 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×1.805))÷(0.0015×1.805)
=195035.72 N
195035.72×1065÷(140×198000)=7.49 mm
②的伸长量:
e=2.71828 k=0.0015 x=2.538 μ=0.25
θ=1.4°×0.017453293=0.02443
195300×(1-2.71828-(0.0015×2.538+0.25×0.02443))÷(0.0015×2.538+0.25×0.02443)=194334.91 N
194334.91×733÷(140×198000)=5.14 mm
①的伸长量:
e=2.71828 k=0.0015 x=10.439 μ=0.25
θ=1.4°×0.017453293=0.02443
195300×(1-2.71828-(0.0015×10.439+0.25×0.02443))÷(0.0015×10.439+0.25×0.02443)=193189.76 N
193189.76×7901÷(140×198000)=55.06mm
3#束的伸长量为:
5.21+7.49+5.14+55.06=72.9×2=145.8 mm
二、 边跨
1#束
①直线段长 2.148米 ②竖曲线段长 L=π÷180°×a×R=3.1415926÷180°×5.5°×30.0=2.880米 ③直线段长 3.308 米 ④平曲线段长 L=π÷180°×a×R=3.1415926÷180°×1.8°×25.0=0.785÷COS5.5°=0.789 ⑤直线段长 0.724米 ⑥工具段长 0.64米(由于箱梁板顶预埋筋影响,千斤顶不能靠近锚环,为不弯曲板顶预埋筋,需增加一个过渡环,具体尺寸为:锚环0.046m+限位板0.035m+过渡环0.15m+千斤顶0.363m+锚环0.046m=0.64m)
Pp=P×(1-e-(kx+μθ))÷(kx+μθ)
Pp=P=195300 N Ep=198 GPa
得:
⑥的伸长量:
e=2.718281828 k=0.0015 x=0.64 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×0.64))÷(0.0015×0.64)
=195206.15 N
195206.15×640÷(140×198000)=4.51 mm
⑤的伸长量:
e=2.718281828 k=0.0015 x=1.364 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×1.364))÷(0.0015×1.364)
=195100.21 N
195100.21×724÷(140×198000)=5.10 mm
④的伸长量:
e=2.718281828 k=0.0015 x=2.153 μ=0.25
θ=1.8°×0.017453293=0.03142
195300×(1-2.71828-(0.0015×2.153+0.25×0.03142))÷(0.0015×2.153+0.25×0.03142)=194221.46 N
194221.46×789÷(140×198000)=5.53 mm
③的伸长量:
e=2.718281828 k=0.0015 x=5.461 μ=0.25
θ=1.8°×0.017453293=0.03142
195300×(1-2.71828-(0.0015×5.461+0.25×0.03142))÷(0.0015×5.461+0.25×0.03142)=193741.28 N
193741.28×3308÷(140×198000)=23.12 mm
②的伸长量:
e=2.71828 k=0.0015 x=8.341 μ=0.25
θ=7.3°×0.017453293=0.12741
195300×(1-2.71828-(0.0015×8.341+0.25×0.12741))÷(0.0015×8.341+0.25×0.12741)=191031.09 N
191031.09×2880÷(140×198000)=19.85 mm
①的伸长量:
e=2.718281828 k=0.0015 x=10.489 μ=0.25
θ=7.3°×0.017453293=0.12741
195300×(1-2.71828-(0.0015×10.489+0.25×0.12741))÷(0.0015×10.489+0.25×0.12741)=190725.94 N
190725.94×2148÷(140×198000)=14.78 mm
1#束的伸长量为:
4.51+5.10+5.53+23.12+19.85+14.78=72.89+73.37=146.26 mm
2#束
①直线段长 3.608米 ②竖曲线段长 L=π÷180°×a×R=3.1415926÷180°×5.5°×30.0=2.88米 ③直线段长 1.84 米 ④平曲线段长 L=π÷180°×a×R=3.1415926÷180°
×1.8°×25.0=0.785÷COS5.5°=0.789 ⑤直线段长 0.724米 ⑥工具段长 0.64米(由于箱梁板顶预埋筋影响,千斤顶不能靠近锚环,为不弯曲板顶预埋筋,需增加一个过渡环,具体尺寸为:锚环0.046m+限位板0.035m+过渡环0.15m+千斤顶0.363m+锚环0.046m=0.64m)
Pp=P×(1-e-(kx+μθ))÷(kx+μθ)
Pp=P=195300 N Ep=198 GPa
得:
⑥的伸长量:
e=2.718281828 k=0.0015 x=0.64 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×0.64))÷(0.0015×0.64)
=195206.15 N
195206.15×640÷(140×198000)=4.51 mm
⑤的伸长量:
e=2.718281828 k=0.0015 x=1.364 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×1.364))÷(0.0015×1.364)
=195100.21 N
195100.21×724÷(140×198000)=5.10 mm
④的伸长量:
e=2.718281828 k=0.0015 x=2.153 μ=0.25
θ=1.8°×0.017453293=0.03142
195300×(1-2.71828-(0.0015×2.153+0.25×0.03142))÷(0.0015×2.153+0.25×0.03142)=194221.46 N
194221.46×789÷(140×198000)=5.53mm
③的伸长量:
e=2.718281828 k=0.0015 x=3.993 μ=0.25
θ=1.8°×0.017453293=0.03142
195300×(1-2.71828-(0.0015×3.993+0.25×0.03142))÷(0.0015×3.993+0.25×0.03142)
=193954.17 N
193954.17×1840÷(140×198000)=12.87mm
②的伸长量:
e=2.71828 k=0.0015 x=6.873 μ=0.25
θ=7.3°×0.017453293=0.12741
195300×(1-2.71828-(0.0015×6.873+0.25×0.12741))÷(0.0015×6.873+0.25×0.12741)=191240.01N
191240.01×2880÷(140×198000)=19.87 mm
①的伸长量:
e=2.718281828 k=0.0015 x=10.481 μ=0.25
θ=7.3°×0.017453293=0.12741
195300×(1-2.71828-(0.0015×10.481+0.25×0.12741))÷(0.0015×10.481+0.25×0.12741)=190727.08 N
190727.08×3608÷(140×198000)=24.82 mm
2#束的伸长量为:
4.51+5.10+5.53+12.87+19.87+24.82=72.7+71.64=144.34 mm
3#束
①直线段长 8.021米 ②竖曲线段长 L=π÷180°×a×R=3.1415926÷180°×1.4°×30.0=0.733米 ③直线段长 1.065 米 ④工具段长 0.74米(由于箱梁板顶预埋筋影响,千斤顶不能靠近锚环,为不弯曲板顶预埋筋,需增加一个过渡环,具体尺寸为:锚环0.046m+限位板0.035m+过渡环0.25m+千斤顶0.363m+锚环0.046m=0.74m)
Pp=P×(1-e-(kx+μθ))÷(kx+μθ)
Pp=P=195300 N Ep=198 GPa
得:
④的伸长量:
e=2.718281828 k=0.0015 x=0.74 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×0.74))÷(0.0015×0.74)
=195191.52 N
195191.52×740÷(140×198000)=5.21 mm
③的伸长量:
e=2.718281828 k=0.0015 x=1.805 μ=0.25
θ=0°
195300×(1-2.71828-(0.0015×1.805))÷(0.0015×1.805)
=195035.72 N
195035.72×1065÷(140×198000)=7.49 mm
②的伸长量:
e=2.71828 k=0.0015 x=2.538 μ=0.25
θ=1.4°×0.017453293=0.02443
195300×(1-2.71828-(0.0015×2.538+0.25×0.02443))÷(0.0015×2.538+0.25×0.02443)=194334.91 N
194334.91×733÷(140×198000)=5.14 mm
①的伸长量:
e=2.71828 k=0.0015 x=10.559 μ=0.25
θ=1.4°×0.017453293=0.02443
195300×(1-2.71828-(0.0015×10.559+0.25×0.02443))÷(0.0015×10.559+0.25×0.02443)=193172.44 N
193172.44×8021÷(140×198000)=55.90 mm
3#束的伸长量为:
5.21+7.49+5.14+55.90=73.74+72.9=146.64 mm
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