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预应力张拉伸长量计算书后张法

2020-12-07 来源:个人技术集锦
一、钢绞线伸长量计算

1. 计算依据

①《公路桥涵施工技术规范》中公式(12.8.3-1);

②《公路桥涵施工技术规范》中《附录G-8 预应力筋平均张拉力的计算》;

③《海滨大道北段二期(疏港三线立交~蛏头沽)设计图纸》。

2.计算公式:

LPpLApEp (12.8.3-1)

P(1e(kx))Pp (附录G-8)

kxPconAp

其中:x—从张拉端至计算截面的孔道长度(m),取张拉端到跨中孔道长度;

连续端 非连续端 N1 17.165 N1 17.325 N2 17.205 N2 17.315 N3 17.240 N3 17.300 N4 17.270 N4 17.300 N5 17.305 N5 17.275 —从张拉端至计算截面曲线孔道部分切线的夹角之和(rad),取8.5o即 0.148353rad;

k—孔道每米局部偏差对摩擦的影响系数,本工程采用塑料波纹管,取0.0015;

本工程采用s15.2mm高强低松弛钢绞线及塑料波纹管—预应力筋与孔道壁的摩擦系数,孔道,根据图纸取0.17;

; P—预应力筋张拉端的张拉力(N)

Ap—预应力筋的截面面积(mm2);

con—张拉控制应力(MPa),根据图纸取0.73fpk;

Pp—预应力筋平均张拉力(N);

,取张拉端到跨中钢绞线长度; L—预应力筋的长度(mm)

中跨 边跨 N1 17165 N1 17325 N2 17205 N2 17315 N3 17240 N3 17300 N4 17270 N4 17300 N5 17305 N5 17275 Ep—钢绞线弹性模量,本工程采用s15.2mm高强低松弛钢绞线,根据试验取1.91105MPa;

(钢绞线弹性模量检测报告附后)

。 L—理论伸长值(mm)

3.伸长值计算

①连续端N1

PconAp0.73fpkAp0.7318601404760368N

P(1e(kx))760368(1e(0.001517.1650.170.148353))PP741316.02N

kx0.001517.1650.170.148353LPpLApEp741316.0217165119.0mm 514041.9110②连续端N2

PconAp0.73fpkAp0.7318601404760368N

P(1e(kx))760368(1e(0.001517.2050.170.148353))PP741293.97N

kx0.001517.2050.170.148353LPpLApEp741293.9717205119.2mm 514041.9110③连续端N3

PconAp0.73fpkAp0.7318601404760368N

P(1e(kx))760368(1e(0.001517.240.170.148353))PP741274.68N

kx0.001517.240.170.148353LPpLApEp741274.6817240119.5mm 514041.9110④连续端N4

PconAp0.73fpkAp0.7318601404760368N

P(1e(kx))760368(1e(0.001517.270.170.148353))PP741258.14N

kx0.001517.270.170.148353LPpLApEp741258.1417270119.7mm 514041.9110⑤连续端N5

PconAp0.73fpkAp0.7318601404760368N

P(1e(kx))760368(1e(0.001517.3050.170.148353))PP741238.85N

kx0.001517.3050.170.148353LPpLApEp741238.8517305119.9mm 514041.9110⑥非连续端N1

PconAp0.73fpkAp0.7318601404760368N

P(1e(kx))760368(1e(0.001517.3250.170.148353))PP741227.83N

kx0.001517.3250.170.148353LPpLApEp741227.8317325120.1mm 514041.9110⑦非连续端N2

PconAp0.73fpkAp0.7318601404760368N

P(1e(kx))760368(1e(0.001517.3150.170.148353))PP741233.34N

kx0.001517.3150.170.148353LPpLApEp741233.3417315120.0mm 514041.9110⑧非连续端N3

PconAp0.73fpkAp0.7318601404760368N

P(1e(kx))760368(1e(0.001517.30.170.148353))PP741241.61N

kx0.001517.30.170.148353LPpLApEp741241.6117300119.9mm 514041.9110⑨非连续端N4

PconAp0.73fpkAp0.7318601405950460N

P(1e(kx))950460(1e(0.001517.30.170.148353))PP926552.01N

kx0.001517.30.170.148353LPpLApEp926552.0117300119.9mm

14051.91105⑩非连续端N5

PconAp0.73fpkAp0.7318601405950460NP(1e(kx))950460(1e(0.001517.2750.170.148353))PP926569.24N

kx0.001517.2750.170.148353LPpLApEp926569.2417275119.7mm

14051.91105由以上计算结果得出:

①中跨箱梁理论伸长值如下:

N1119.02238.0mm N2119.22238.4mm N3119.52239.0mm N4119.72239.4mm N5119.92239.8mm ②边跨箱梁理论伸长值如下

N1119.0120.1239.1mm N2119.2120.0239.2mm N3119.5119.9239.4mm N4119.7119.9239.6mm N5119.9119.7239.6mm

二、压力表读数计算

1. 计算依据

①《海滨大道北段二期(疏港三线立交~蛏头沽)设计图纸》;

②《千斤顶标定报告09-JZ163~178》;(报告附后)

2. 计算公式

①千斤顶力与压力表读数对应关系如下式:

yaxb

其中:y—千斤顶力(KN);

x—压力表读数(MPa);

a,b—常系数。

②力与应力关系如下式:

PconAp

各项代表意义同伸长值计算。

3. 油表读数计算

①1#油泵,千斤顶编号090201,压力表编号1269;

千斤顶证书号:09-JZ163100090080070060050040030020010000.0y = 19.19x + 6.46892R = 0.9998检定点(KN)5.010.015.020.025.030.035.040.045.050.055.0压力表读数(Mpa)

由上图可知:y19.19x6.4689,则压力表读数计算如下:

4束钢绞线:

P0.7318601404760368N760.368KN

15%控制应力时:

y0.15P0.15760.368114.06KN

xy6.4689114.066.46895.6Mpa

19.1919.1930%控制应力时:

y0.3P0.3760.368228.11KN

xy6.4689228.116.468911.5Mpa

19.1919.19100%控制应力时:

yP760.368KN

xy6.4689760.3686.468939.3Mpa

19.1919.195束钢绞线:

P0.7318601405950460N950.46KN

15%控制应力时:

y0.15P0.15950.46142.57KN

xy6.4689142.576.46897.1Mpa

19.1919.1930%控制应力时:

y0.3P0.3950.46285.14KN

xy6.4689285.146.468914.5Mpa

19.1919.19100%控制应力时:

yP950.46KN

xy6.4689950.466.468949.2Mpa

19.1919.19

②2#油泵,千斤顶编号090202,压力表编号9023;

千斤顶证书号:09-JZ166100090080070060050040030020010000.0y = 19.065x + 2.23762R = 0.9999检定点(KN)5.010.015.020.025.030.035.040.045.050.055.0压力表读数(Mpa)

由上图可知:y19.065x2.2376,则压力表读数计算如下:

4束钢绞线:

P0.7318601404760368N760.368KN

15%控制应力时:

y0.15P0.15760.368114.06KN

xy2.2376114.062.23765.9Mpa

19.06519.06530%控制应力时:

y0.3P0.3760.368228.11KN

xy2.2376228.112.237611.8Mpa

19.06519.065100%控制应力时:

yP760.368KN

xy2.2376760.3682.237639.8Mpa

19.06519.0655束钢绞线:

P0.7318601405950460N950.46KN

15%控制应力时:

y0.15P0.15950.46142.57KN

xy2.2376142.572.23767.4Mpa

19.06519.06530%控制应力时:

y0.3P0.3950.46285.14KN

xy2.2376285.142.237614.8Mpa

19.06519.065100%控制应力时:

yP950.46KN

xy2.2376950.462.237649.7Mpa

19.06519.065③3#油泵,千斤顶编号090302,压力表编号1259;

千斤顶证书号:09-JZ168100090080070060050040030020010000.0y = 19.193x + 1.3431R2 = 0.9998检定点(KN)5.010.015.020.025.030.035.040.045.050.055.0压力表读数(Mpa)

由上图可知:y19.193x1.3431,则压力表读数计算如下:

4束钢绞线:

15%控制应力时:

30%控制应力时:

100%控制应力时:

5束钢绞线:

15%控制应力时:

P0.7318601404760368N760.368KN

y0.15P0.15760.368114.06KN

xy1.3431114.061.343119.19319.1935.9Mpa

y0.3P0.3760.368228.11KN

xy1.343122819.193.111.343119.19311.8Mpa

yP760.368KN

xy1.3431760.368119.193.343119.19339.5Mpa

P0.7318601405950460N950.46KN

y0.15P0.15950.46142.57KN

xy1.3431142.571.19.193343119.1937.4Mpa

30%控制应力时:

y0.3P0.3950.46285.14KN

xy1.3431285.141.343114.8Mpa

19.19319.193100%控制应力时:

yP950.46KN

xy1.3431950.461.343149.5Mpa

19.19319.193④4#油泵,千斤顶编号090303,压力表编号8823;

千斤顶证书号:09-JZ170100090080070060050040030020010000.0y = 19.047x + 2.19252R = 0.9999检定点(KN)5.010.015.020.025.030.035.040.045.050.055.0压力表读数(Mpa)

由上图可知:y19.047x2.1925,则压力表读数计算如下:

4束钢绞线:

P0.7318601404760368N760.368KN

15%控制应力时:

y0.15P0.15760.368114.06KN

y2.1925114.062.192530%控制应力时:

100%控制应力时:

5束钢绞线:

15%控制应力时:

30%控制应力时:

100%控制应力时:

x19.04719.0475.9Mpa

y0.3P0.3760.368228.11KN

xy2.192519.047228.112.192519.04711.9Mpa

yP760.368KN

xy2.1925760.36819.0472.192519.04739.8Mpa

P0.7318601405950460N950.46KN

y0.15P0.15950.46142.57KN

xy2.1925142.572.19.047192519.0477.4Mpa

y0.3P0.3950.46285.14KN

xy2.192528519.047.142.192519.04714.9Mpa

yP950.46KN

x

y2.1925950.462.192549.8Mpa

19.04719.047⑤5#油泵,千斤顶编号090304,压力表编号1199;

千斤顶证书号:09-JZ171100090080070060050040030020010000.0y = 19.071x - 0.69312R = 0.9998检定点(KN)5.010.015.020.025.030.035.040.045.050.055.0压力表读数(Mpa)

由上图可知:y19.071x0.6931,则压力表读数计算如下:

4束钢绞线:

P0.7318601404760368N760.368KN

15%控制应力时:

y0.15P0.15760.368114.06KN

y0.6931114.060.693130%控制应力时:

100%控制应力时:

5束钢绞线:

15%控制应力时:

30%控制应力时:

100%控制应力时:

x19.07119.0716.0Mpa

y0.3P0.3760.368228.11KN

xy0.693119.071228.110.693119.07112.0Mpa

yP760.368KN

xy0.6931760.36819.0710.693119.07139.9Mpa

P0.7318601405950460N950.46KN

y0.15P0.15950.46142.57KN

xy0.6931142.570.19.071693119.0717.5Mpa

y0.3P0.3950.46285.14KN

xy0.693128519.071.140.693119.07115.0Mpa

yP950.46KN

xy0.6931950.460.693149.9Mpa

19.07119.071⑥6#油泵,千斤顶编号090305,压力表编号9523;

千斤顶证书号:09-JZ173100090080070060050040030020010000.0y = 19.311x + 1.4319R2 = 0.9998检定点(KN)5.010.015.020.025.030.035.040.045.050.055.0压力表读数(Mpa)

由上图可知:y19.311x1.4319,则压力表读数计算如下:

4束钢绞线:

P0.7318601404760368N760.368KN

15%控制应力时:

y0.15P0.15760.368114.06KN

xy1.4319114.061.43195.8Mpa

19.31119.31130%控制应力时:

y0.3P0.3760.368228.11KN

xy1.4319228.111.431911.7Mpa

19.31119.311100%控制应力时:

yP760.368KN

xy1.4319760.3681.431939.3Mpa

19.31119.3115束钢绞线:

P0.7318601405950460N950.46KN

15%控制应力时:

y0.15P0.15950.46142.57KN

xy1.4319142.571.43197.3Mpa

19.31119.31130%控制应力时:

y0.3P0.3950.46285.14KN

xy1.4319285.141.431914.7Mpa

19.31119.311100%控制应力时:

yP950.46KN

xy1.4319950.461.431949.1Mpa

19.31119.311⑦7#油泵,千斤顶编号090306,压力表编号1089;

千斤顶证书号:09-JZ175100090080070060050040030020010000.0y = 19.351x + 3.55742R = 0.9999检定点(KN)5.010.015.020.025.030.035.040.045.050.055.0压力表读数(Mpa)

由上图可知:y19.351x3.5574,则压力表读数计算如下:

4束钢绞线:

P0.7318601404760368N760.368KN

15%控制应力时:

y0.15P0.15760.368114.06KN

xy3.5574114.063.55745.7Mpa

19.35119.35130%控制应力时:

y0.3P0.3760.368228.11KN

xy3.5574228.113.557411.6Mpa

19.35119.351100%控制应力时:

yP760.368KN

xy3.5574760.3683.557439.1Mpa

19.35119.3515束钢绞线:

P0.7318601405950460N950.46KN

15%控制应力时:

y0.15P0.15950.46142.57KN

xy3.5574142.573.55747.2Mpa

19.35119.35130%控制应力时:

y0.3P0.3950.46285.14KN

xy3.557285.143.557414.6Mpa

19.35119.351100%控制应力时:

yP950.46KN

xy3.5574950.463.557448.9Mpa

19.35119.351

⑧8#油泵,千斤顶编号090309,压力表编号3239;

千斤顶证书号:09-JZ177100090080070060050040030020010000.0y = 19.079x - 0.38432R = 0.9999检定点(KN)5.010.015.020.025.030.035.040.045.050.055.0压力表读数(Mpa)

由上图可知:y19.079x0.3843,则压力表读数计算如下:

4束钢绞线:

P0.7318601404760368N760.368KN

15%控制应力时:

y0.15P0.15760.368114.06KN

xy0.3843114.060.38436.0Mpa

19.07919.07930%控制应力时:

y0.3P0.3760.368228.11KN

xy0.3843228.110.384312.0Mpa

19.07919.079100%控制应力时:

yP760.368KN

xy0.3843760.3680.384339.9Mpa

19.07919.0795束钢绞线:

P0.7318601405950460N950.46KN

15%控制应力时:

y0.15P0.15950.46142.57KN

xy0.3843142.570.38437.5Mpa

19.07919.07930%控制应力时:

y0.3P0.3950.46285.14KN

xy0.3843285.140.384315.0Mpa

19.07919.079100%控制应力时:

yP950.46KN

x

y0.3843950.460.384349.8Mpa

19.07919.079根据以上计算,将千斤顶张拉力与压力表读数对应关系汇总如下:

千斤顶张拉力与压力表读数对应关系表

钢绞线 张拉力 1#千斤顶 2#千斤顶 3#千斤顶 4#千斤顶 5#千斤顶 6#千斤顶 7#千斤顶 8#千斤顶 (KN) 压力表1269 压力表9023 压力表1259 压力表8823 压力表1199 压力表9523 压力表1089 压力表3239 15% 114.06 5.6 5.9 5.9 5.9 6.0 5.8 5.7 6.0 4束 30% 228.11 11.5 11.8 11.8 11.9 12.0 11.7 11.6 12.0 100% 760.37 39.3 39.8 39.5 39.8 39.9 39.3 39.1 39.9 5束 15% 142.57 7.1 7.4 7.4 7.4 7.5 7.3 7.2 7.5 30% 285.14 14.5 14.8 14.8 14.9 15.0 14.7 14.6 15.0 100% 950.46 49.2 49.7 49.5 49.8 49.9 49.1 48.9 49.8

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