N1 N2 N3 N4 如下图所示:
2.197 1.096 2.196 5.876 7.330 11.782 16.797 12.597 10.205 6.881 0.782 1.323
N1一端伸长量计算:
PP=P*(1-e-0.028)/0.028=0.986P N1一端伸长量:
(1551.2*2.197*0.986*10)/(139*8*1.95)+(1551.2*0.986*7.333*10)/(139*8*1.95)+(1551.2*0.986*10.205*10)/(139*8*1.95)=15.5+51.7+71.98=139.2mm
N2一端伸长量计算:
PP=P*(1-e-0.033)/0.033=0.984P N2一端伸长量:
(1551.2*1.096*0.984*10)/(139*8*1.95)+(1551.2*0.986*11.782*10)/(139*8*1.95)+(1551.2*0.986*6.881*10)/(139*8*1.95)=7.7+82.9+48.4=139.0mm
N3一端伸长量计算:
PP=P*(1-e-0.031)/0.031=0.985P
N3一端伸长量:
(1551.2*2.196*0.985*10)/(139*8*1.95)+(1551.2*0.985*16.797*10)/(139*8*1.95)+(1551.2*0.985*0.782*10)/(139*8*1.95)=15.5+118.4+5.5=139.4mm
N4一端伸长量计算:
PP=P*(1-e-0.037)/0.037=0.982P N4一端伸长量:
(1551.2*5.876*0.982*10)/(139*8*1.95)+(1551.2*0.982*12.597*10)/(139*8*1.95)+(1551.2*0.982*1.323*10)/(139*8*1.95)=41.3+88.5+9.3=139.1mm
N1钢束单端延伸量△L=139.2mm,90%为125.3mm,图纸设计伸长量:122.4mm
N2钢束单端延伸量△L=139.0mm,90%为125.1mm,图纸设计伸长量:122.4mm
N3钢束单端延伸量△L=139.4mm,90%为125.5mm,图纸设计伸长量:123.3mm
N4钢束单端延伸量△L=139.1mm,90%为125.2mm,图纸设计伸长量:124.2mm
(4)9孔正弯矩预应力束的直线段和曲线段数据表
预应力编号 直线段长度(L1)米 曲线段长度(L2)米 直线段长度 (L3)米 N1 N2 N3 2.197 1.096 2.196 7.330 11.782 16.797 10.165 6.841 0.742
N4 如图所示:
5.876 12.597 1.283
N1一端伸长量计算:
PP=P*(1-e-0.028)/0.028=0.986P N1一端伸长量:
(1745.2*2.197*0.986*10)/(139*9*1.95)+(1745.2*0.986*7.333*10)/(139*9*1.95)+(1745.2*0.986*10.165*10)/(139*9*1.95)=15.5+51.7+71.7=138.9mm
N2一端伸长量计算:
PP=P*(1-e-0.033)/0.033=0.984P N2一端伸长量:
(1745.2*1.096*0.984*10)/(139*9*1.95)+(1745.2*0.984*11.782*10)/(139*9*1.95)+(1745.2*0.986*6.841*10)/(139*9*1.95)=7.7+82.9+48.2=138.8mm
N3一端伸长量计算:
PP=P*(1-e-0.031)/0.031=0.985P N3一端伸长量:
(1745.2*2.196*0.985*10)/(139*9*1.95)+(1745.2*0.985*16.797*10)/(139*9*1.95)+(1745.2*0.985*0.742*10)/(139*9*1.95)=15.5+118.4+5.2=139.1mm
N4一端伸长量计算:
PP=P*(1-e-0.037)/0.037=0.982P N4一端伸长量:
(1745.2*5.876*0.982*10)/(139*9*1.95)+(1745.2*0.982*12.597*10)/(139*9*1.95)+(1745.2*0.982*1.283*10)/(139*9*1.95)=41.3+88.5+9.0=138.8mm
N1钢束单端延伸量△L=138.9mm,90%为125.0mm,图纸设计伸长量:122.4mm
N2钢束单端延伸量△L=138.8mm,90%为124.9mm,图纸设计伸长量:122.4mm
N3钢束单端延伸量△L=139.1mm,90%为125.2mm,图纸设计伸长量:123.3mm
N4钢束单端延伸量△L=138.8mm,90%为124.9mm,图纸设计伸长量:124.2mm
施工时前10%张拉伸长量不准确,不予考虑,控制10%~20%、20%~100%的伸长量,伸长量偏差不超过±6%,否则应分析原因或重新张拉。 2、张拉油表读数计算
设计张拉应力:σk=0.75fpk=1395MPa 千斤顶型号:250t,编号: SC250111089 对应油表编号:1102802
回归方程:Y=0.02284X+0.3,40mT梁张拉对应油表读数见下表
40mT梁对应油表读数计算表
束截面积 数 锚下控编部制应力σ号 位 n K(Mpa) ) A(mm2P(KN) (KN) 读数 N9 1 N9 2 N3 N9 4 N8 1 N2 N8 3 1395 139 1551.2 155.1 3.8 310.2 6 中8 跨 6.7 1395 139 1551.2 155.1 3.8 310.2 6 775.18 1551.2 35.7 6.7 1395 139 1551.2 155.1 3.8 310.2 6 775.18 1551.2 35.7 7.4 1395 139 1745.2 174.5 4.3 349.0 6 775.18 1551.2 35.7 8.3 边跨 9 1395 139 1745.2 174.5 4.3 349.0 6 872.20.2 1745.2 40.2 8.3 1395 139 1745.2 174.5 4.3 349.0 6 872.20.2 1745.2 40.2 8.3 1395 139 1745.2 174.5 4.3 349.0 6 872.20.2 1745.2 40.2 表(KN) 读数 8.3 872.20.2 1745.2 40.2 N) 表(K读数 (KN) 读数 油油油表油表张拉力 10%P 应对20%P 应P 对应P 对应对500%