后张法预应力钢绞线的理论伸长量计算书
后张法预应力钢绞线的理论伸长量计算书
一、 计算依据:《公路桥涵施工技术规范》(JTJ041-2000)及《施工
图纸》
二、 计算公式: △L=PpL/AyEg
式中:△L—理论伸长值
Pp—平均张拉力(N)
L— 预应力钢材长度(cm)
Eg—预应力钢材弹性模量(N/mm2)
Ay—预应力钢材截面面积(mm2)
平均张拉力Pp的计算公式Pp=P[1-e-(kx+μθ)]/(kx+μ
θ)
式中: P—预应力钢材张拉端张拉力
x—从张拉端至计算截面的孔道长度(m)
θ—从张拉端至计算截面曲线孔道部分切线的夹角之和
(rad)
μ—预应力钢筋与孔道壁的摩擦系数。见(JTJ041-2000)
附表11.4
k—孔道每米局部偏差对摩擦的影响系数。见(JTJ041-20
00)附表11.4
三、计算参数的选取:
Eg=1.95×105(实验数据),Ay=140mm2 。k=0.0015,μ=0.25(图纸给定)
每根预应力钢绞线端部计算长度增加45cm。
1、 正弯矩钢绞线伸长量计算
16m 端跨空心板预应力钢材伸长量:
钢绞线束N1的θ值:左θ1=0.038144、右θ1’=0.038144
钢绞线束N2的θ值:左θ2=0.039055、右θ2’=0.039055
将钢绞线束按直线段、圆曲线段、直线段分为三段:
直线段:
N1:P1=1357.8×140=190092(N),X1=45+264.8=309.8,
X1=45+253=298
左Pp1= P[1-e-(kx+μθ)]/(kx+μθ)
=190092×[1-e-(0.0015×3.098+0.25×0)]/0.0015×3.098+0.25
×0 =189651.00(N)
右Pp1’= P[1-e-(kx+μθ)]/(kx+μθ)
=190092×[1-e-(0.0015×2.98+0.25×0)]/0.0015×
2.98+0.25×0 =189667.78(N)
左△L1 =189651.00×309.8/1.95×10
右△L1’=189667.78×298/1.95×1055×140=2.1522cm ×140=2.0704cm
圆曲线段:
P2=189651.00×2-190092=189210.01(N)
P2’=189667.78×2-190092=189243.55(N)
左Pp2= P[1-e-(kx+μθ)]/(kx+μθ)
=189210.01×[1-e-(0.0015×2.397+0.25×0.038144)]/0.0015×
2.397+0.25×0.038144 =188849.35(N)
右Pp2’= P[1-e-(kx+μθ)]/(kx+μθ)
=189243.55×[1-e-(0.0015×2.454+0.25×0.039055)]/0.0015
×2.454+0.25×0.039055 =188819.84(N)
左△L2 =188849.35×276.8/1.95×10
右△L2’=188819.84×265/1.95×1055×140=1.6581cm ×140=1.6973cm 直线段:
P3=188849.35×2-189210.01=188488.69(N)
P3’=188819.84×2-189243.55=188396.12(N)
左Pp3= P[1-e-(kx+μθ)]/(kx+μθ)
=188488.69×[1-e-(0.0015×3.1137+0.25×0)]/0.0015×
3.1137+0.25×0 =188049.2(N)
右Pp3’= P[1-e-(kx+μθ)]/(kx+μθ)
=188396.12×[1-e-(0.0015×2.4583+0.25×0)]/0.0015×
2.4583+0.25×0 =188049.2(N)
左△L3 =188049.2×311.37/1.95×105×140=2.1448cm
5右△L3’=188049.2×245.83/1.95×10×140=1.6933cm
左△L =5.955cm 右△L =5.461cm
全板△L =11.416
钢绞线束N1的θ值:左θ1=0.024783、右θ1’=0.024783
钢绞线束N2的θ值:左θ2=0.025594、右θ2’=0.025594
N2:P1=1357.8×140=190092(N),X1=45+205=217,
X1=45+193.4=217
左Pp1= P[1-e-(kx+μθ)]/(kx+μθ)
=190092×[1-e-(0.0015×2.50+0.25×0)]/0.0015×2.50+0.25×0 =189736.02(N)
右Pp1’= P[1-e-(kx+μθ)]/(kx+μθ)
=190092×[1-e-(0.0015×2.384+0.25×0)]/0.0015×
2.384+0.25×0 =189752.52(N)
左△L1 =189736.02×250/1.95×105×140=1.7375cm
5右△L1’=189752.52×238.4/1.95×10×140=1.6570cm
圆曲线段:
P2=189736.02×2-190092=189380.05(N)
P2’=189752.52×2-190092=189413.04(N)
左Pp2= P[1-e-(kx+μθ)]/(kx+μθ)
=189380.05×[1-e-(0.0015×1.557+0.25×0.024783)]/0.0015×
1.557+0.25×0.024783 =189283.44(N)
右Pp2’= P[1-e-(kx+μθ)]/(kx+μθ)
=189413.04×[1-e-(0.0015×1.608+0.25×0.025594)]/0.0015
×1.608+0.25×0.025594 =189257.05(N)
左△L2 =189283.44×155.7/1.95×105×140=1.0795cm
5右△L2’=189257.05×160.8/1.95×10×140=1.1147cm
直线段:
P3=189283.44×2-189380.05=189186.83(N)
P3’=189257.05×2-189413.04=189101.06(N)
左Pp3= P[1-e-(kx+μθ)]/(kx+μθ)
=189186.83×[1-e-(0.0015×4.51065+0.25×0)]/0.0015×
4.51065+0.25×0 =188548.26(N)
右Pp3’= P[1-e-(kx+μθ)]/(kx+μθ)
=187386.8×[1-e-(0.0015×3.90535+0.25×0)]/0.0015×
3.90535+0.25×0 =188548.26(N)
左△L3 =188548.26×451.065/1.95×105×140=3.1153cm
5右△L3’=186973.2507×390.535/1.95×10×
140=2.6972cm
左△L =5.932cm 右△L =5.469cm 全板△L=11.401
16m 中跨边板 预应力钢材伸长量:
钢绞线束N1的θ值:左θ1=0.030627、右θ1’=0.030627
钢绞线束N2的θ值:左θ2=0.030627、右θ2’=0.030627
将钢绞线束按直线段、圆曲线段、直线段分为三段: 直线段:
N1:P1=1357.8×140=190092(N),X1=45+323.4=323.4
X2=45+323.4=323.4
左Pp1= P[1-e-(kx+μθ)]/(kx+μθ)
=190092×[1-e-(0.0015×3.234+0.25×0)]/0.0015×3.234+0.25×0 =189631.68(N)
右Pp1’= P[1-e-(kx+μθ)]/(kx+μθ)
=190092×[1-e-(0.0015×3.234+0.25×0)]/0.0015×
3.234+0.25×0 =189631.68N)
左△L1 =189631.68×323.4/1.95×105×140=1.3334cm
5右△L1’=189631.68×323.4/1.95×10×140=1.3334cm
圆曲线段:
P2=189631.68×2-190092=189171.35(N)
P2’=189631.68×2-190092=189171.35(N)
左Pp2= P[1-e-(kx+μθ)]/(kx+μθ)
=189171.35×[1-e-(0.0015×1.925+0.25×0.030627)]/0.0015×
1.925+0.25×0.030627 =189093.32(N)
右Pp2’= P[1-e-(kx+μθ)]/(kx+μθ)
=189171.35×[1-e-(0.0015×1.925+0.25×0.030627)]/0.0015
×1.925+0.25×0.030627 =189093.32(N)
左△L2 =189093.32×192.5/1.95×105×140=1.322cm
5右△L2’=189093.32×192.5/1.95×10×140=1.322cm
直线段:
P3=189093.32×2-189171.35=189015.30(N)
P3’=189093.32×2-189171.35=189015.30(N)
左Pp3= P[1-e-(kx+μθ)]/(kx+μθ)
=189015.30×[1-e-(0.0015×3.027+0.25×0)]/0.0015×
3.027+0.25×0 =188586.83(N)
右Pp3’= P[1-e-(kx+μθ)]/(kx+μθ)
=189015.30×[1-e-(0.0015×3.027+0.25×0)]/0.0015×
3.027+0.25×0=188586.83(N)
左△L3 =188586.83×302.700/1.95×105×140=2.091cm
5右△L3’=188586.83×302.700/1.95×10×140=2.091cm
左L=5.671cm 右L=5.671cm
全板△L=11.342
16m 中跨边板 预应力钢材伸长量:
钢绞线束N1的θ值:左θ1=0.018633、右θ1’=0.018633
钢绞线束N2的θ值:左θ2=0.018633、右θ2’=0.018633
将钢绞线束按直线段、圆曲线段、直线段分为三段:
直线段:
N2:P1=1357.8×140=190092(N),X1=45+214.9=259.9
X1=45+214.9=259.9
左Pp1= P[1-e-(kx+μθ)]/(kx+μθ)
=190092×[1-e-(0.0015×2.599+0.25×0)]/0.0015×
2.599+0.25×0 =189721.94(N)
右Pp1’= P[1-e-(kx+μθ)]/(kx+μθ)
=190092×[1-e-(0.0015×2.599+0.25×0)]/0.0015×
2.599+0.25×0 =189721.94(N)
左△L1 =189721.94×259.9/1.95×105 ×140=1.8062cm
5右△L1’=189721.94×259.9/1.95×10×140=1.8062cm
圆曲线段:
P2=189721.94×2-190092=189351.89(N)
P2’=189721.94×2-190092=189351.89(N)
左Pp2= P[1-e-(kx+μθ)]/(kx+μθ)
=189351.89×[1-e-(0.0015×1.171+0.25×0)]/0.0015×
1.171+0.25×0=189483.61(N)
右Pp2’= P[1-e-(kx+μθ)]/(kx+μθ)
=189351.89×[1-e-(0.0015×1.171+0.25×0)]/0.0015×
1.171+0.25×0 =189483.61(N)
左△L2 =189483.61×117.1/1.95×105×140=0.8128cm
5右△L2’=189483.61×117.1/1.95×10×140=0.8128cm
直线段:
P3=189483.61×2-189351.89=189615.32(N)
P3’=189483.61×2-189351.89=189615.32(N)
左Pp3=189615.32×[1-e-(0.0015×4.4145+0.25×0)]/0.0015×
4.4145+0.25×0 =188988.91(N)
右Pp3’=189615.32×[1-e-(0.0015×4.4145+0.25×0)]/0.0015×
4.4145+0.25×0 =188988.91(N)
左△L3 =188988.91×441.45/1.95×105×140=3.056cm
5右△L3’=188988.91×441.45/1.95×10×140=3.056cm
左△L =5.675cm 右△L =5.675cm,
全板△L=11.350
16m 中跨中板 预应力钢材伸长量:
钢绞线束N1的θ值:左θ1=0.029783、
右θ1’=0.029783
钢绞线束N2的θ值:左θ1=0.029783、
右θ1’=0.029783
将钢绞线束按直线段、圆曲线段、直线段分为三段: 直线段:
N1:P1=1357.8×140=190092(N),X1=45+281=326
X1=45+281=326
左Pp1=190092×[1-e-(0.0015×3.26+0.25×0)]/0.0015×3.26+0.25
×0 =189627.98(N)
右Pp1’=190092×[1-e-(0.0015×3.26+0.25×0)]/0.0015×
3.26+0.25×0 =189627.98(N)
左△L1 =189627.98×326/1.95×105×140=2.2644cm
5右△L1’=189627.98×326/1.95×10×140=2.2644cm
圆曲线段:
P2=189627.98×2-190092=189163.96(N)
P2’=189627.98×2-190092=189163.96(N)
左Pp2=189163.96×[1-e-(0.0015×1.871+0.25×0.029783)]/0.0015×
1.871+0.25×0.029783 =189120.89(N)
右Pp2’=189163.96×[1-e-(0.0015×1.871+0.25×0.029783)]/0.0015
×1.871+0.25×0.029783=189120.89(N)
左△L2 =189120.89×187.1/1.95×105×140=1.2961cm
5右△L2’=189120.89×187.1/1.95×10×140=1.2961cm
直线段:
P3=189120.89×2-189163.96=189077.81(N)
P3’=189120.89×2-189163.96=189077.81(N)
左Pp3=189077.81×[1-e-(0.0015×3.0635+0.25×0)]/0.0015×
3.0635+0.25×0 =188644.04(N)
右Pp3’=189077.81×[1-e-(0.0015×3.0635+0.25×0)]/0.0015×
3.0635+0.25×0 =188644.04(N)
左△L3 =188644.04×306.350/1.95×105×140=2.1169cm
5右△L3’=188644.04×306.350/1.95×10×140=2.1169cm
左L=5.677cm 右L=5.677cm
16m 中跨中板 预应力钢材伸长量:
钢绞线束N1的θ值:左θ1=0.011316、右θ1’=0.011316
钢绞线束N2的θ值:左θ2=0.011316、右θ2’=0.011316
将钢绞线束按直线段、圆曲线段、直线段分为三段:
直线段:
N2:P1=1357.8×140=190092(N),X1=45+232.9=277.9
X2=45+232.9=277.9
(0.0015×2.779+0.25×0)左Pp1=190092×[1-e-]/0.0015×2.779+0.25
×0 =189696.35(N)
右Pp1’=190092×[1-e-(0.0015×2.779+0.25×0)]/0.0015×
2.779+0.25×0 =189696.35(N)
左△L1 =189696.35×277.9/1.95×105×140=1.931cm
5右△L1’=189696.35×277.9/1.95×10×140=1.931cm
圆曲线段:
P2=189696.35×2-190092=189300.7(N)
P2’=189696.35×2-190092=189300.7(N)
左Pp2=189300.7×[1-e-(0.0015×1.171+0.25×0)]/0.0015×
1.171+0.25×0=189708.86(N)
右Pp2’=189300.7×[1-e-(0.0015×1.171+0.25×0)]/0.0015×
1.171+0.25×0 =189708.86(N)
左△L2 =189708.86×80.5/1.95×105×140=0.5594cm
5右△L2’=189708.86×80.5/1.95×10×140=0.5594cm
直线段:
P3=189708.86×2-189300.7=188537.62(N)
P3’=189708.86×2-189300.7=188537.62(N)
左Pp3=188537.62×[1-e-(0.0015×4.597+0.25×0)]/0.0015×
4.597+0.25×0 =187889.08(N)
右Pp3’=188537.62×[1-e-(0.0015×4.597+0.25×0)]/0.0015×
4.597+0.25×0 =187889.08(N)
左△L3 =187889.08×459.7/1.95×105×140=3.1638cm
5右△L3’=187889.08×459.7/1.95×10×140=3.1638cm
左△L =5.652cm 右△L =5.652cm
全板△L=11.304cm
控制应力达到10%时,油表3036#、30248#读数:
x=190092N=190.092KN×0.1=19.0092
y1=0.0343x-0.1=0.0343×19.0092-0.1=0.552
y2=0.0352x-0.4=0.0352×19.0092-0.4=0.252
控制应力达到20%时,油表3036#、30248#读数: x=190092N=190.092KN×0.2=38.0184
y1=0.0343x-0.1=0.0343×38.0184-0.1=1.204
y2=0.0352x-0.4=0.0352×38.0184-0.4=0.938
控制应力达到40%时,油表3036#、30248#读数: x=190092N=190.092KN×0.4=76.1568
y1=0.0343x-0.1=0.0343×76.1568-0.1=2.512
y2=0.0352x-0.4=0.0352×76.1568-0.4=2.281
控制应力达到60%时,油表3036#、30248#读数: x=190092N=190.092KN×0.6=38.0184
y1=0.0343x-0.1=0.0343×38.0184-0.1=3.812
y2=0.0352x-0.4=0.0352×38.0184-0.4=3.615
控制应力达到80%时,油表3036#、30248#读数: x=190092N=190.092KN×0.8=152.0736
y1=0.0343x-0.1=0.0343×152.0736-0.1=5.116
y2=0.0352x-0.4=0.0352×152.0736-0.4=4.953
控制应力达到100%时,油表3036#、30248#读数: x=190092N=190.092KN×1=190.092
y1=0.0343x-0.1=0.0343×190.092-0.1=6.42
y2=0.0352x-0.4=0.0352×190.092-0.4=6.291
控制应力达到10%时,油表3036#、30248#读数:(3根)
x=190092N=190.092KN×0.1=19.0092
y1=0.0343x-0.1=0.0343×19.0092×3-0.1=1.856
y2=0.0352x-0.4=0.0352×19.0092×3-0.4=1.556
控制应力达到20%时,油表3036#、30248#读数: x=190092N=190.092KN×0.2=38.0184
y1=0.0343x-0.1=0.0343×38.0184×3-0.1=3.812
y2=0.0352x-0.4=0.0352×38.0184×3-0.4=3.614
控制应力达到40%时,油表3036#、30248#读数: x=190092N=190.092KN×0.4=76.1568
y1=0.0343x-0.1=0.0343×76.1568×3-0.1=7.736
y2=0.0352x-0.4=0.0352×76.1568×3-0.4=7.643
控制应力达到60%时,油表3036#、30248#读数: x=190092N=190.092KN×0.6=38.0184
y1=0.0343x-0.1=0.0343×38.0184×3-0.1=11.636
y2=0.0352x-0.4=0.0352×38.0184×3-0.4=11.645
控制应力达到80%时,油表3036#、30248#读数: x=190092N=190.092KN×0.8=152.0736
y1=0.0343x-0.1=0.0343×152.0736×3-0.1=15.548
y2=0.0352x-0.4=0.0352×152.0736×3-0.4=15.659
控制应力达到100%时,油表3036#、30248#读数: x=190092N=190.092KN×1=190.092
y1=0.0343x-0.1=0.0343×190.092×3-0.1=19.46
y2=0.0352x-0.4=0.0352×190.092×3-0.4=19.673
控制应力达到10%时,油表3036#、30248#读数:(4根)
x=190092N=190.092KN×0.1=19.0092
y1=0.0343x-0.1=0.0343×19.0092×4-0.1=2.508
y2=0.0352x-0.4=0.0352×19.0092×4-0.4=2.208
控制应力达到20%时,油表3036#、30248#读数: x=190092N=190.092KN×0.2=38.0184
y1=0.0343x-0.1=0.0343×38.0184×4-0.1=5.116
y2=0.0352x-0.4=0.0352×38.0184×4-0.4=4.952
控制应力达到40%时,油表3036#、30248#读数: x=190092N=190.092KN×0.4=76.1568
y1=0.0343x-0.1=0.0343×76.1568×4-0.1=10.348
y2=0.0352x-0.4=0.0352×76.1568×4-0.4=10.324
控制应力达到60%时,油表3036#、30248#读数: x=190092N=190.092KN×0.6=38.0184
y1=0.0343x-0.1=0.0343×38.0184×4-0.1=15.548
y2=0.0352x-0.4=0.0352×38.0184×4-0.4=15.66
控制应力达到80%时,油表3036#、30248#读数: x=190092N=190.092KN×0.8=152.0736
y1=0.0343x-0.1=0.0343×152.0736×4-0.1=20.764
y2=0.0352x-0.4=0.0352×152.0736×4-0.4=21.012
控制应力达到100%时,油表3036#、30248#读数: x=190092N=190.092KN×1=190.092
y1=0.0343x-0.1=0.0343×190.092×4-0.1=25.98
y2=0.0352x-0.4=0.0352×190.092×4-0.4=26.364