水泥路面结构计算书大全.doc

（一）.特重交通（ 不涉及高速公路）城市快速路、货运主干路 Ne=45*106 (次/车道) E0 =30MPa fr =5.0MPa EC = 31GPa 基层 h1 =20cm 二灰碎石 E1=1400MPa (6:14:80) 底基层 h2 =20cm 二灰砂砾 E2=1200MPa (7:13:80) Ex=E1h12+E2h22/ h12+h22 =(1400*0.22+1200*0.22)/(0.22+0.22) =1300 a=6.221-1.51（1300/30）-0.45=4.497 b=1-1.44(1300/30)-0.55=0.819 Dx=(E1h13+E2h23)/12+(h1+h2)2/4*(1/h1E1+1/h2E2)-1 =(1400*0.23+1200*0.23)/12+0.42/4*(1/0.2*1400+1/0.2*1200)-1 =6.903 hx=(12Dx/Ex)1/3=(12*6.903/1300)1/3=0.3994 Et=ahxb* E0(Ex/E0)1/3=4.497*0.39940.819*30(1300/30)1/3=223.520 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=25cm r=0.537*0.25(31000/223.520)1/3=0.695 PS =0.077r0.6*h-2=0.077*0.6950.6*0.25-2=0.9903 kr=0.87 kf=Ne0.057=2.730 kc=1.25 Pr =kr*kf*kc*PS=0.87(45*106)0.057*1.25*0.9903=2.941 设板长 L=5m L/r=7.2 查图B.2.2 Bx=0.63 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=80/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*31000*0.25*80*0.63)/2=1.953 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=5/1.9530.828(1.953 /5)1.323-0.041 =0.5062 tr=kt*tm =0.5062*1.953=0.989 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.23 1.23（0.989+2.941）=4.834 MPafr =5.0 MPa 可（二）.特重交通高速公路 Ne=45*106 (次/车道) E0 =30MPa fr =5.0MPa EC = 31GPa 基层 h1 =20cm 二灰碎石 E1=1400MPa (6:14:80) 底基层 h2 =20cm 二灰砂砾 E2=1200MPa (7:13:80) Ex=E1h12+E2h22/ h12+h22 =(1400*0.22+1200*0.22)/(0.22+0.22) =1300 a=6.221-1.51（1300/30）-0.45=4.497 b=1-1.44(1300/30)-0.55=0.819 Dx=(E1h13+E2h23)/12+(h1+h2)2/4*(1/h1E1+1/h2E2)-1 =(1400*0.23+1200*0.23)/12+0.42/4*(1/0.2*1400+1/0.2*1200)-1 =6.903 hx=(12Dx/Ex)1/3=(12*6.903/1300)1/3=0.3994 Et=ahxb* E0(Ex/E0)1/3=4.497*0.39940.819*30(1300/30)1/3=223.520 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=27cm r=0.537*0.27(31000/223.520)1/3=0.7505 PS =0.077r0.6*h-2=0.077*0.75050.6*0.27-2=0.8892 kr=0.87 kf=Ne0.057=2.730 kc=1.30 Pr =kr*kf*kc*PS=0.87(45*106)0.057*1.30*0.8892=2.746 设板长 L=5m L/r=6.662 查图B.2.2 Bx=0.57 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=76/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*31000*0.27*76*0.57)/2=1.813 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=5/1.8130.828(1.813 /5)1.323-0.041 =0.4836 tr=kt*tm =0.4836*1.813=0.877 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.33 1.33（0.877+2.746）=4.819 MPafr =5.0 MPa 可（三）.特重交通（ 不涉及高速公路）城市快速路、货运主干路 Ne=35*106 (次/车道) E0 =30MPa fr =5.0MPa EC = 31GPa 基层 h1 =20cm 二灰碎石 E1=1400MPa (6:14:80) 底基层 h2 =20cm 二灰砂砾 E2=1200MPa (7:13:80) Ex=E1h12+E2h22/ h12+h22 =(1400*0.22+1200*0.22)/(0.22+0.22) =1300 a=6.221-1.51（1300/30）-0.45=4.497 b=1-1.44(1300/30)-0.55=0.819 Dx=(E1h13+E2h23)/12+(h1+h2)2/4*(1/h1E1+1/h2E2)-1 =(1400*0.23+1200*0.23)/12+0.42/4*(1/0.2*1400+1/0.2*1200)-1 =6.903 hx=(12Dx/Ex)1/3=(12*6.903/1300)1/3=0.3994 Et=ahxb* E0(Ex/E0)1/3=4.497*0.39940.819*30(1300/30)1/3=223.520 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=24cm r=0.537*0.24(31000/223.520)1/3=0.667 PS =0.077r0.6*h-2=0.077*0.6670.6*0.24-2=1.0485 kr=0.87 kf=Ne0.057=2.692 kc=1.25 Pr =kr*kf*kc*PS=0.87(35*106)0.057*1.25*1.0485=3.069 设板长 L=5m L/r=7.495 查图B.2.2 Bx=0.64 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=82/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*31000*0.24*82*0.64)/2=1.952 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=5/1.9520.828(1.952 /5)1.323-0.041 =0.506 tr=kt*tm =0.506*1.952=0.988 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.23 1.23（0.988+3.069）=4.990 MPafr =5.0 MPa 可（四）.特重交通高速公路 Ne=35*106 (次/车道) E0 =30MPa fr =5.0MPa EC = 31GPa 基层 h1 =20cm 二灰碎石 E1=1400MPa (6:14:80) 底基层 h2 =20cm 二灰砂砾 E2=1200MPa (7:13:80) Ex=E1h12+E2h22/ h12+h22 =(1400*0.22+1200*0.22)/(0.22+0.22) =1300 a=6.221-1.51（1300/30）-0.45=4.497 b=1-1.44(1300/30)-0.55=0.819 Dx=(E1h13+E2h23)/12+(h1+h2)2/4*(1/h1E1+1/h2E2)-1 =(1400*0.23+1200*0.23)/12+0.42/4*(1/0.2*1400+1/0.2*1200)-1 =6.903 hx=(12Dx/Ex)1/3=(12*6.903/1300)1/3=0.3994 Et=ahxb* E0(Ex/E0)1/3=4.497*0.39940.819*30(1300/30)1/3=223.520 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=26cm r=0.537*0.26(31000/223.520)1/3=0.7227 PS =0.077r0.6*h-2=0.077*0.72270.6*0.26-2=0.9374 kr=0.87 kf=Ne0.057=2.6916 kc=1.30 Pr =kr*kf*kc*PS=0.87(35*106)0.057*1.30*0.9374=2.854 设板长 L=5m L/r=6.918 查图B.2.2 Bx=0.587 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=78/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*31000*0.26*78*0.587)/2=1.845 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=5/1.8450.828(1.845 /5)1.323-0.041 =0.489 tr=kt*tm =0.489*1.845=0.902 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.33 1.33（0.902+2.854）=4.995 MPafr =5.0 MPa 可（五）.重交通城市快速路、城市主干路、货运干路 Ne=20*106 (次/车道) E0 =30MPa fr =5.0MPa EC = 31GPa 基层 h1 =20cm 二灰碎石 E1=1400MPa (6:14:80) 底基层 h2 =20cm 二灰砂砾 E2=1200MPa (7:13:80) Ex=E1h12+E2h22/ h12+h22 =(1400*0.22+1200*0.22)/(0.22+0.22)=1300 a=6.221-1.51（1300/30）-0.45=4.497 b=1-1.44(1300/30)-0.55=0.819 Dx=(E1h13+E2h23)/12+(h1+h2)2/4*(1/h1E1+1/h2E2)-1 =(1400*0.23+1200*0.23)/12+0.42/4*(1/0.2*1400+1/0.2*1200)-1 =6.903 hx=(12Dx/Ex)1/3=(12*6.903/1300)1/3=0.3994 Et=ahxb* E0(Ex/E0)1/3=4.497*0.39940.819*30(1300/30)1/3=223.520 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=23cm r=0.537*0.23(31000/223.520)1/3=0.6393 PS =0.077r0.6*h-2=0.077*0.63930.6*0.23-2=1.113 kr=0.87 kf=Ne0.057=2.607 kc=1.25 Pr =kr*kf*kc*PS=0.87(20*106)0.057*1.25*1.113=3.155 设板长 L=5m L/r=7.82 查图B.2.2 Bx=0.66 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=85/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*31000*0.23*85*0.66)/2=2.000 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=5/2.0000.828(2.000 /5)1.323-0.041 =0.5134 tr=kt*tm =0.5134*2.000=1.027 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.16 1.16（1.027+3.155）=4.851 MPafr =5.0 MPa 可（六）.重交通城市快速路、城市主干路、货运干路 Ne=20*106 (次/车道) E0 =30MPa fr =4.5MPa EC = 29GPa 基层 h1 =20cm 二灰碎石 E1=1400MPa (6:14:80) 底基层 h2 =20cm 二灰砂砾 E2=1200MPa (7:13:80) Ex=E1h12+E2h22/ h12+h22 =(1400*0.22+1200*0.22)/(0.22+0.22)=1300 a=6.221-1.51（1300/30）-0.45=4.497 b=1-1.44(1300/30)-0.55=0.819 Dx=(E1h13+E2h23)/12+(h1+h2)2/4*(1/h1E1+1/h2E2)-1 =(1400*0.23+1200*0.23)/12+0.42/4*(1/0.2*1400+1/0.2*1200)-1 =6.903 hx=(12Dx/Ex)1/3=(12*6.903/1300)1/3=0.3994 Et=ahxb* E0(Ex/E0)1/3=4.497*0.39940.819*30(1300/30)1/3=223.520 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=25cm r=0.537*0.25(29000/223.520)1/3=0.68 PS =0.077r0.6*h-2=0.077*0.680.6*0.25-2=0.9772 kr=0.87 kf=Ne0.057=2.607 kc=1.25 Pr =kr*kf*kc*PS=0.87(20*106)0.057*1.25*0.9772=2.771 设板长 L=5m L/r=7.36 查图B.2.2 Bx=0.63 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=80/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*29000*0.25*80*0.63)/2=1.827 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=4.5/1.8270.828(1.827/4.5)1.323- 0.041=0.5179 tr=kt*tm =0.5179*1.827=0.946 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.16 1.16（0.946+2.771）=4.312 MPafr =4.5 MPa 可（七）.重交通城市快速路、城市主干路、货运干路 Ne=10*106 (次/车道) E0 =30MPa fr =4.5MPa EC = 29GPa 基层 h1 =20cm 二灰碎石 E1=1400MPa (6:14:80) 底基层 h2 =20cm 二灰砂砾 E2=1200MPa (7:13:80) Ex=E1h12+E2h22/ h12+h22 =(1400*0.22+1200*0.22)/(0.22+0.22) =1300 a=6.221-1.51（1300/30）-0.45=4.497 b=1-1.44(1300/30)-0.55=0.819 Dx=(E1h13+E2h23)/12+(h1+h2)2/4*(1/h1E1+1/h2E2)-1 =(1400*0.23+1200*0.23)/12+0.42/4*(1/0.2*1400+1/0.2*1200)-1 =6.903 hx=(12Dx/Ex)1/3=(12*6.903/1300)1/3=0.3994 Et=ahxb* E0(Ex/E0)1/3=4.497*0.39940.819*30(1300/30)1/3=223.520 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=24cm r=0.537*0.24(29000/223.520)1/3=0.652 PS =0.077r0.6*h-2=0.077*0.6520.6*0.24-2=1.035 kr=0.87 kf=Ne0.057=2.506 kc=1.25 Pr =kr*kf*kc*PS=0.87(10*106)0.057*1.25*1.035=2.820 设板长 L=5m L/r=7.66 查图B.2.2 Bx=0.65 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=82/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*29000*0.24*82*0.65)/2=1.8548 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=4.5/1.85480.828(1.8548/4.5)1.323- 0.041=0.5224 tr=kt*tm =0.5224*1.8548=0.969 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.16 1.16（0.969+2.820）=4.395 MPafr =4.5 MPa 可（八）.重交通城市快速路、城市主干路、货运干路 Ne=10*106 (次/车道) E0 =30MPa fr =4.5MPa EC = 29GPa 基层为一种材料 h1 =42cm 二灰砂砾 E1=1200MPa (7:13:80) Ex=1200 a=6.221-1.51（1200/30）-0.45=4.434 b=1-1.44(1200/30)-0.55=0.8107 hx=0.42 Et=ahxb* E0(Ex/E0)1/3=4.434*0.420.819*30(1200/30)1/3=225.1825 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=24cm r=0.537*0.24(29000/225.1825)1/3=0.6508 PS =0.077r0.6*h-2=0.077*0.65080.6*0.24-2=1.033 kr=0.87 kf=Ne0.057=2.506 kc=1.25 Pr =kr*kf*kc*PS=0.87(10*106)0.057*1.25*1.033=2.816 设板长 L=5m L/r=7.68 查图B.2.2 Bx=0.65 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=82/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*29000*0.24*82*0.65)/2=1.855 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=4.5/1.8550.828(1.855/4.5)1.323- 0.041=0.5224 tr=kt*tm =0.5224*1.855=0.969 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.16 1.16（0.969+2.816）=4.391 MPafr =4.5 MPa 可 （九）.重交通城市快速路、城市主干路、货运干路 Ne=5*106 (次/车道) E0 =30MPa fr =4.5MPa EC = 29GPa 基层为一种材料 h1 =48cm 二灰砂砾 E1=1200MPa (7:13:80) Ex=1200 a=6.221-1.51（1200/30）-0.45=4.434 b=1-1.44(1200/30)-0.55=0.8107 hx=0.48 Et=ahxb* E0(Ex/E0)1/3=4.434*0.480.819*30(1200/30)1/3=250.927 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=23cm r=0.537*0.23(29000/250.927)1/3=0.6016 PS =0.077r0.6*h-2=0.077*0.60160.6*0.23-2=1.0731 kr=0.87 kf=Ne0.057=2.409 kc=1.25 Pr =kr*kf*kc*PS=0.87(5*106)0.057*1.25*1.0731=2.811 设板长 L=5m L/r=8.31 查图B.2.2 Bx=0.665 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=85/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*29000*0.23*85*0.665)/2=1.885 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=4.5/1.8850.828(1.885/4.5)1.323- 0.041=0.5272 tr=kt*tm =0.5272*1.885=0.994 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.16 1.16（0.994+2.811）=4.414 MPafr =4.5 MPa 可 （十）.重交通城市快速路、城市主干路、货运干路 Ne=5*106 (次/车道) E0 =30MPa fr =4.5MPa EC = 29GPa 基层为一种材料 h1 =45cm 二灰砂砾 E1=1200MPa (7:13:80) Ex=1200 a=6.221-1.51（1200/30）-0.45=4.434 b=1-1.44(1200/30)-0.55=0.8107 hx=0.45 Et=ahxb* E0(Ex/E0)1/3=4.434*0.450.819*30(1200/30)1/3=238.136 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=24cm r=0.537*0.24(29000/238.136)1/3=0.6338 PS =0.077r0.6*h-2=0.077*0.63380.6*0.24-2=1.0216 kr=0.87 kf=Ne0.057=2.409 kc=1.25 Pr =kr*kf*kc*PS=0.87(5*106)0.057*1.25*1.0216=2.676 设板长 L=5m L/r=7.827 查图B.2.2 Bx=0.648 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=82/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*29000*0.24*82*0.648)/2=1.849 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=4.5/1.8490.828(1.849/4.5)1.323- 0.041=0.5215 tr=kt*tm =0.5215*1.849=0.964 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.16 1.16（0.964+2.676）=4.222 MPafr =4.5 MPa 可 （十一）.重交通城市快速路、城市主干路、货运干路 Ne=2*106 (次/车道) E0 =30MPa fr =4.5MPa EC = 29GPa 基层为一种材料 h1 =48cm 二灰砂砾 E1=1200MPa (7:13:80) Ex=1200 a=6.221-1.51（1200/30）-0.45=4.434 b=1-1.44(1200/30)-0.55=0.8107 hx=0.48 Et=ahxb* E0(Ex/E0)1/3=4.434*0.480.819*30(1200/30)1/3=250.927 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=22cm r=0.537*0.22(29000/250.927)1/3=0.5755 PS =0.077r0.6*h-2=0.077*0.57550.6*0.22-2=1.142 kr=0.87 kf=Ne0.057=2.286 kc=1.25 Pr =kr*kf*kc*PS=0.87(2*106)0.057*1.25*1.142=2.839 设板长 L=5m L/r=8.69 查图B.2.2 Bx=0.69 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=88/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*29000*0.22*88*0.69)/2=1.937 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=4.5/1.9370.828(1.937/4.5)1.323- 0.041=0.535 tr=kt*tm =0.535*1.937=1.037 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.16 1.16（1.037+2.839）=4.496 MPafr =4.5 MPa 可（十二）.重交通城市快速路、城市主干路、货运干路 Ne=2*106 (次/车道) E0 =30MPa fr =4.5MPa EC = 29GPa 基层为一种材料 h1 =45cm 二灰砂砾 E1=1200MPa (7:13:80) Ex=1200 a=6.221-1.51（1200/30）-0.45=4.434 b=1-1.44(1200/30)-0.55=0.8107 hx=0.45 Et=ahxb* E0(Ex/E0)1/3=4.434*0.450.819*30(1200/30)1/3=238.136 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=23cm r=0.537*0.23(29000/238.136)1/3=0.6122 PS =0.077r0.6*h-2=0.077*0.61220.6*0.23-2=1.0844 kr=0.87 kf=Ne0.057=2.286 kc=1.25 Pr =kr*kf*kc*PS=0.87(2*106)0.057*1.25*1.0844=2.696 设板长 L=5m L/r=8.17 查图B.2.2 Bx=0.673 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=85/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*29000*0.23*85*0.673)/2=1.908 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=4.5/1.9080.828(1.908/4.5)1.323- 0.041=0.531 tr=kt*tm =0.531*1.908=1.013 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.16 1.16（1.013+2.696）=4.302 MPafr =4.5 MPa 可（十三）.中档交通城市主干路、城市次干路 Ne=1*106 (次/车道) E0 =30MPa fr =4.5MPa EC = 29GPa 基层为一种材料 h1 =45cm 二灰砂砾 E1=1200MPa (7:13:80) Ex=1200 a=6.221-1.51（1200/30）-0.45=4.434 b=1-1.44(1200/30)-0.55=0.8107 hx=0.45 Et=ahxb* E0(Ex/E0)1/3=4.434*0.450.819*30(1200/30)1/3=238.136 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=22cm r=0.537*0.22(29000/238.136)1/3=0.5856 PS =0.077r0.6*h-2=0.077*0.58560.6*0.22-2=1.154 kr=0.87 kf=Ne0.057=2.198 kc=1.20 Pr =kr*kf*kc*PS=0.87(1*106)0.057*1.20*1.154=2.648 设板长 L=5m L/r=8.54 查图B.2.2 Bx=0.70 北京地区最大温度梯度按城市道路设计规范表10.2.8 Tg=88/m tm =(10-5*EC*h* Tg*Bx)/2=(10-5*29000*0.22*88*0.70)/2=1.965 按公路水泥混凝土路面设计规范表B.2.3 回归系数 a=0.828 b=0.041 c=1.323 kt= fr/tma(tm / fr)c-b=4.5/1.9650.828(1.965/4.5)1.323- 0.041=0.5397 tr=kt*tm =0.5397*1.965=1.061 可靠度系数根据公路水泥混凝土路面设计规范表3.0.3采用1.13 1.13（1.061+2.648）=4.191 MPafr =4.5 MPa 可（十四）.中档交通城市主干路、城市次干路 Ne=0.5*106 (次/车道) E0 =30MPa fr =4.5MPa EC = 29GPa 基层为一种材料 h1 =45cm 二灰砂砾 E1=1200MPa (7:13:80) Ex=1200 a=6.221-1.51（1200/30）-0.45=4.434 b=1-1.44(1200/30)-0.55=0.8107 hx=0.45 Et=ahxb* E0(Ex/E0)1/3=4.434*0.450.819*30(1200/30)1/3=238.136 砼板相对刚度半径 r=0.537h(Ec/Et)1/3 设板厚 h=21cm r=0.537*0