菜园坝长江大桥钢桁梁设计计算书(420m钢拱桥)

1、菜园坝长江大桥钢桁梁设计计算书第一章 概述一、 设计规范1998年铁路桥涵设计规范中华人民共和国铁道部1999年铁路桥梁钢结构设计规范中华人民共和国交通部公路桥涵钢结构及木结构设计规范二、 钢材桁梁 Q345D/E辅助连接系 Q235B高强螺栓 40硼（40B）螺母垫圈 甲45（A45）焊缝 力学性能不低于基材三、 连接方式采用高强螺栓和焊接。四、 高强螺栓型号 螺杆直径 孔 30 33 24 26 五、 容许应力本桥主要受力结构采用Q345D/E钢材，连接系采用Q235B钢材，基本容许应力：Q345D/E：轴向应力，弯曲应力Q235B：轴向应力=140MPa，弯曲应力w=145MPa强度检算

2、时根据桥规，主+次制动力（或风力或摇摆力），容许应力提高1.45，在本检算中检算了弯矩次应力，提高系数偏安全取为1.3，即容许应力为260Mpa。剪应力端部承压（磨光顶紧）应力疲劳容许应力及其它容许应力见桥规六、 活载等级汽车荷载：城A级轨道交通荷载：按重庆市轨道交通总公司文件（【2002】85号）提供的荷载标准。七、 结构尺寸桥跨全长：800m主桁梁高度：10.20m节间长度：16m第二章 主 桁 架第一节 主桁梁杆件内力计算一、 内力的组成主桁杆件的内力由以下几部分组成：一期、二期恒载所产生的内力，汽车活载所产生的内力，轻轨所产生的内力，人群所产生的内力。二、 内力的组合具体各项内力及内力

3、组合详见表2-2、表2-3、表2-4、表2-5、表2-6。内力组合时按以下原则进行：内力组合公式：式中：组合内力；一期恒载及二期恒载内力；六车道活载内力；双线轻轨；人群荷载。杆件内力根据分析组提供的数据进行整理，分析组提供6车道汽车活载已经乘了0.55车道折减系数。弯矩只考虑主轴方向（面内）弯矩。杆件连接计算（拼接板、螺栓连接）中主要杆件（弦杆、腹杆、下横梁、吊杆）按照等强连接，次要杆件按内力需要连接（平纵联）。组合中考虑最大轴力最大弯矩和最小轴力最小弯矩两种情况进行检算。第二节 主桁杆件设计一、 主桁杆件的检算内容及设计步骤下弦杆件根据受力性质的不同，应进行表2-1所列项目的检算 表2-1项

4、目检算内容检算杆件1刚度各类杆件2局部稳定压杆3总体稳定压杆4强度各类杆件5疲劳出现拉应力的受循环荷载杆件设计方法及步骤：1.参考已有的设计资料及初步计算结果，初步拟定结构杆件尺寸。2.根据初步拟定的截面尺寸，结合荷载情况，算出杆件内力，根据内力调整截面，直至符合要求为止。3.为了简化杆件类型以简化制造，便于互换和管理，同类杆件中内力相差不大者，尽量采用相同的截面。这样虽然多用了一些钢材，但制造工费降低，总的经济效果有所提高。这是检算时有些杆件应力有较大富裕的原因。二、杆件截面几何特征的计算1. 由于弦杆内力较大，且为了便于连接，故上、下弦杆均采用箱型截面，尺寸约为800*980，见图2-1、

5、图2-2、图2-3、图2-4。图2-1 下弦杆件截面示意图图2-2 中（边）上弦杆件截面示意图5菜园坝长江大桥钢桁梁设计计算书 下弦杆内力表 表2-2部位内力情况一期恒载二期恒载城-A轻轨人群内力组合轴力最大弯矩最大轴力最小弯矩最小maxminmaxminmaxminB1P6.531E+058.227E+054.059E+05-1.514E+054.665E+05-1.901E+051.542E+05-9.720E+042.316E+061.075E+06M31.873E+06-2.321E+042.157E+04-5.131E+043.113E+05-1.215E+051.441E+04-2

6、.069E+042.157E+061.687E+06B1B2P1.033E+068.226E+056.318E+05-2.384E+057.854E+05-3.050E+052.396E+05-1.511E+053.216E+061.220E+06M3-3.244E+05-2.287E+044.585E+04-6.578E+043.253E+05-2.616E+052.183E+04-2.937E+04-3.740E+03-6.541E+05B2P1.422E+061.590E+061.375E+06-6.763E+051.671E+06-8.766E+055.456E+05-3.852E+0

7、55.956E+061.243E+06M3-2.578E+043.457E+025.791E+04-2.313E+044.759E+05-7.081E+052.288E+04-1.067E+044.634E+05-6.880E+05B2B3P1.422E+061.590E+061.375E+06-6.763E+051.673E+06-8.766E+055.456E+05-3.852E+055.958E+061.243E+06M31.611E+053.957E+028.822E+04-4.658E+047.459E+05-2.234E+053.962E+04-2.945E+049.287E+05

8、-9.657E+04B3P1.343E+059.836E+051.609E+06-1.145E+061.982E+06-1.462E+066.708E+05-5.730E+054.612E+06-1.776E+06M3-5.265E+047.279E+038.040E+04-3.655E+045.083E+05-8.838E+052.981E+04-1.983E+044.947E+05-8.831E+05B3B4P1.347E+059.835E+051.610E+06-1.145E+061.983E+06-1.462E+066.708E+05-5.730E+054.613E+06-1.775E

9、+06M31.235E+057.232E+038.155E+04-6.194E+047.640E+05-2.453E+053.586E+04-3.042E+049.064E+05-1.593E+05B4P-2.875E+06-9.762E+051.346E+06-1.652E+061.626E+06-2.046E+066.271E+05-7.218E+05-9.085E+05-7.858E+06M3-3.803E+042.060E+041.074E+05-6.234E+045.363E+05-8.869E+054.548E+04-3.563E+045.799E+05-8.891E+05B4B5

10、P-2.875E+06-9.764E+051.346E+06-1.652E+061.627E+06-2.046E+066.271E+05-7.218E+05-9.072E+05-7.858E+06M35.622E+042.073E+046.334E+04-8.223E+047.513E+05-2.617E+052.909E+04-3.120E+048.225E+05-2.437E+05B5P-7.846E+06-4.482E+066.386E+05-2.265E+066.300E+05-2.686E+064.333E+05-8.654E+05-1.096E+07-1.758E+07M3-9.5

11、20E+041.837E+041.081E+05-9.748E+045.265E+05-8.994E+055.669E+04-5.570E+045.206E+05-1.001E+06B5B6P-7.846E+06-4.482E+066.386E+05-2.265E+066.305E+05-2.686E+064.333E+05-8.654E+05-1.096E+07-1.758E+07M32.356E+041.917E+043.928E+04-8.726E+047.098E+05-1.873E+051.956E+04-3.396E+047.257E+05-2.168E+05B6P-1.093E+

12、07-6.901E+064.609E+05-2.829E+062.689E+05-3.020E+064.330E+05-1.072E+06-1.692E+07-2.405E+07M31.503E+053.254E+051.157E+05-2.959E+052.894E+05-5.540E+055.906E+04-1.142E+058.672E+05-3.305E+05BzP-9.225E+06-5.947E+061.288E+06-3.351E+062.361E+05-2.417E+067.645E+05-1.358E+06-1.342E+07-2.146E+07M3-1.778E+06-3.

13、875E+051.247E+05-6.944E+052.815E+05-7.171E+051.137E+05-2.777E+05-1.733E+06-3.540E+06B7P-4.585E+06-2.833E+069.851E+05-2.199E+063.717E+05-1.562E+065.836E+05-9.038E+05-5.906E+06-1.153E+07M3-2.192E+05-1.972E+047.927E+04-1.303E+054.017E+05-8.015E+055.228E+04-6.184E+042.213E+05-1.104E+06B7B8P-4.584E+06-2.

14、833E+069.851E+05-2.199E+063.723E+05-1.562E+065.836E+05-9.038E+05-5.905E+06-1.153E+07M31.440E+05-1.931E+045.383E+04-4.719E+046.820E+05-2.316E+052.519E+04-2.465E+047.978E+05-1.376E+05B8P3.474E+062.194E+061.192E+06-8.252E+051.547E+06-6.961E+055.277E+05-3.770E+058.350E+063.976E+06M3-3.742E+05-2.267E+047

15、.958E+04-1.521E+054.529E+05-9.602E+054.854E+04-6.165E+041.068E+05-1.421E+06B8B9P3.475E+062.194E+061.192E+06-8.252E+051.547E+06-6.961E+055.277E+05-3.770E+058.351E+063.977E+06M31.594E+05-2.305E+041.019E+05-3.677E+047.210E+05-2.027E+054.339E+04-2.866E+048.942E+05-9.513E+04B9P9.500E+065.781E+062.046E+06

16、-5.690E+052.890E+06-5.614E+057.585E+05-2.765E+051.998E+071.402E+07M3-1.089E+05-1.061E+049.007E+04-6.811E+045.318E+05-9.037E+054.436E+04-3.118E+044.600E+05-1.007E+06B9B10P9.500E+065.781E+062.046E+06-5.691E+052.893E+06-5.614E+057.585E+05-2.765E+051.999E+071.402E+07M32.944E+05-1.082E+041.428E+05-3.493E

17、+047.745E+05-1.737E+055.719E+04-2.981E+041.131E+067.870E+04B10P1.388E+078.067E+062.960E+06-6.116E+053.808E+06-4.687E+051.068E+06-3.737E+052.839E+072.064E+07M3-4.450E+04-1.349E+041.206E+05-4.217E+046.222E+05-8.823E+055.081E+04-2.356E+046.306E+05-9.013E+05B10B11P1.388E+078.067E+062.960E+06-6.115E+053.

18、808E+06-4.687E+051.068E+06-3.737E+052.839E+072.064E+07M34.294E+05-1.462E+041.841E+05-3.944E+048.587E+05-2.046E+057.221E+04-3.375E+041.380E+061.757E+05B11P1.596E+078.869E+063.387E+06-7.107E+054.035E+06-5.834E+051.258E+06-4.986E+053.194E+072.322E+07M35.877E+047.409E+021.675E+05-3.551E+046.363E+05-8.67

19、3E+056.593E+04-2.621E+048.072E+05-7.673E+05B11B12P1.596E+078.869E+063.387E+06-7.107E+054.037E+06-5.834E+051.258E+06-4.986E+053.195E+072.322E+07M34.680E+05-1.516E+021.790E+05-3.823E+048.626E+05-2.118E+056.930E+04-3.034E+041.430E+062.258E+05B12P1.598E+078.193E+063.349E+06-8.120E+053.625E+06-7.514E+051

20、.277E+06-5.895E+053.091E+072.222E+07M31.166E+051.400E+041.942E+05-4.320E+046.228E+05-8.665E+057.729E+04-3.615E+048.947E+05-7.087E+05B12B13P1.598E+078.193E+063.349E+06-8.120E+053.625E+06-7.514E+051.277E+06-5.895E+053.091E+072.222E+07M34.728E+051.287E+041.633E+05-3.679E+048.462E+05-2.292E+056.359E+04-

21、2.832E+041.418E+062.306E+05B13P1.377E+076.017E+062.832E+06-9.822E+052.570E+06-9.103E+051.124E+06-6.523E+052.507E+071.749E+07M31.681E+051.371E+041.996E+05-5.845E+045.723E+05-8.739E+058.306E+04-4.663E+049.089E+05-6.835E+05B13B14P1.377E+076.017E+062.832E+06-9.822E+052.572E+06-9.103E+051.124E+06-6.523E+

22、052.507E+071.749E+07M34.066E+051.334E+041.293E+05-3.962E+047.908E+05-2.387E+055.212E+04-2.812E+041.268E+061.544E+05B14P9.722E+062.440E+061.990E+06-1.258E+061.378E+06-1.078E+068.345E+05-7.036E+051.552E+079.436E+06M31.650E+051.328E+041.798E+05-8.937E+045.275E+05-8.979E+057.823E+04-5.628E+048.466E+05-7

23、.390E+05B14B15P9.722E+062.440E+061.990E+06-1.258E+061.380E+06-1.078E+068.345E+05-7.036E+051.552E+079.437E+06M33.371E+051.351E+048.707E+04-5.382E+047.544E+05-2.572E+053.708E+04-2.840E+041.123E+065.749E+04B15P3.635E+06-2.427E+061.239E+06-2.064E+068.387E+05-1.820E+065.439E+05-8.908E+053.300E+06-3.051E+

24、06M38.866E+044.122E+041.563E+05-8.071E+044.948E+05-9.242E+056.702E+04-4.835E+047.427E+05-7.987E+05B15B16P3.635E+06-2.427E+061.239E+06-2.064E+068.387E+05-1.820E+065.439E+05-8.908E+053.300E+06-3.050E+06M32.261E+054.126E+045.886E+04-1.885E+057.418E+05-4.402E+052.344E+04-7.070E+049.967E+05-3.233E+05B16P

25、0.000E+00-4.748E+068.835E+05-2.251E+066.561E+05-2.433E+063.556E+05-8.883E+05-3.228E+06-9.757E+06M30.000E+00-1.671E+049.334E+04-2.810E+054.919E+05-1.248E+064.233E+04-1.115E+055.278E+05-1.434E+06B16B17P0.000E+00-4.748E+068.835E+05-2.251E+066.561E+05-2.433E+063.556E+05-8.883E+05-3.228E+06-9.757E+06M30.

26、000E+00-1.560E+048.277E+04-1.814E+057.892E+05-4.677E+055.364E+04-7.781E+047.970E+05-6.309E+05B17P8.912E+04-3.370E+066.976E+05-1.772E+064.969E+05-1.579E+064.464E+05-7.929E+05-1.976E+06-6.982E+06M3-9.936E+04-1.221E+046.299E+04-1.272E+054.253E+05-1.006E+063.056E+04-4.844E+043.414E+05-1.149E+06B17B18P8.

27、938E+04-3.370E+066.976E+05-1.772E+064.988E+05-1.579E+064.464E+05-7.929E+05-1.974E+06-6.982E+06M37.151E+04-1.092E+045.773E+04-8.768E+047.293E+05-3.224E+053.439E+04-4.212E+047.861E+05-3.270E+05B18P2.300E+05-1.995E+068.700E+05-1.506E+061.066E+06-1.252E+064.466E+05-6.730E+051.815E+05-4.820E+06M3-1.078E+

28、05-4.734E+033.456E+04-5.338E+045.306E+05-9.423E+051.461E+04-2.110E+044.019E+05-1.016E+06B18B19P2.303E+05-1.995E+068.700E+05-1.506E+061.068E+06-1.252E+064.466E+05-6.730E+051.841E+05-4.820E+06M36.409E+04-3.795E+034.727E+04-6.168E+047.947E+05-3.045E+052.393E+04-2.868E+048.289E+05-2.815E+05B19P2.905E+05

29、-1.054E+061.064E+06-1.438E+061.587E+06-1.281E+064.442E+05-5.860E+051.796E+06-3.709E+06M3-1.139E+05-2.489E+034.626E+04-6.044E+045.675E+05-9.515E+051.980E+04-2.361E+044.439E+05-1.036E+06B19B20P2.907E+05-1.054E+061.064E+06-1.438E+061.590E+06-1.281E+064.442E+05-5.860E+051.798E+06-3.709E+06M35.839E+04-1.

30、602E+034.808E+04-5.670E+048.164E+05-3.001E+051.998E+04-2.320E+048.426E+05-2.733E+05B20P4.179E+05-4.324E+051.204E+06-1.415E+061.917E+06-1.541E+064.490E+05-5.306E+052.951E+06-3.147E+06M3-1.197E+05-1.044E+025.340E+04-6.309E+045.818E+05-9.577E+052.162E+04-2.522E+044.601E+05-1.048E+06B20B21P4.182E+05-4.3

31、24E+051.204E+06-1.415E+061.918E+06-1.541E+064.490E+05-5.306E+052.951E+06-3.146E+06M35.878E+047.542E+025.182E+04-5.676E+048.255E+05-3.049E+051.926E+04-2.130E+048.558E+05-2.735E+05B21P6.622E+05-3.789E+041.275E+06-1.346E+062.047E+06-1.628E+064.661E+05-4.964E+053.772E+06-2.510E+06M3-1.145E+051.623E+036.

32、069E+04-6.577E+045.893E+05-9.595E+052.369E+04-2.559E+044.808E+05-1.045E+06B21B22P6.625E+05-3.791E+041.275E+06-1.346E+062.049E+06-1.628E+064.661E+05-4.964E+053.774E+06-2.510E+06M36.597E+042.478E+035.299E+04-5.468E+048.289E+05-3.059E+051.933E+04-2.000E+048.687E+05-2.629E+05B22P9.648E+052.047E+051.262E

33、+06-1.211E+062.008E+06-1.548E+064.732E+05-4.588E+054.278E+06-1.746E+06M3-1.059E+053.238E+036.038E+04-6.042E+045.881E+05-9.594E+052.293E+04-2.300E+044.892E+05-1.029E+06B22B23P9.651E+052.047E+051.262E+06-1.211E+062.011E+06-1.548E+064.732E+05-4.588E+054.281E+06-1.746E+06M37.388E+044.096E+035.103E+04-4.

34、801E+048.269E+05-3.048E+051.849E+04-1.745E+048.743E+05-2.454E+05B23P1.268E+063.493E+051.198E+06-1.045E+061.863E+06-1.331E+064.717E+05-4.203E+054.547E+06-9.174E+05M3-9.866E+044.904E+035.775E+04-5.324E+045.846E+05-9.572E+052.177E+04-2.019E+044.920E+05-1.010E+06B23B24P1.269E+063.493E+051.198E+06-1.045E

35、+061.865E+06-1.331E+064.717E+05-4.203E+054.549E+06-9.172E+05M38.097E+045.758E+034.684E+04-3.988E+048.227E+05-3.036E+051.696E+04-1.450E+048.750E+05-2.273E+05B24P1.529E+064.297E+051.113E+06-8.858E+051.698E+06-1.021E+064.522E+05-3.736E+054.662E+06-9.977E+04M3-9.127E+045.875E+035.263E+04-4.442E+045.798E

36、+05-9.546E+051.977E+04-1.685E+044.907E+05-9.905E+05B24B25P1.530E+064.296E+051.113E+06-8.858E+051.701E+06-1.021E+064.522E+05-3.736E+054.664E+06-9.962E+04M38.710E+046.729E+034.258E+04-3.252E+048.180E+05-2.997E+051.556E+04-1.178E+048.736E+05-2.092E+05B25P1.740E+064.626E+051.059E+06-7.868E+051.603E+06-6

37、.758E+054.364E+05-3.417E+054.766E+065.950E+05M3-8.606E+042.835E+034.866E+04-3.790E+045.763E+05-9.556E+051.832E+04-1.448E+044.857E+05-9.826E+05B25B26P1.740E+064.625E+051.059E+06-7.868E+051.604E+06-6.758E+054.364E+05-3.417E+054.768E+065.952E+05M39.029E+043.699E+034.122E+04-2.932E+048.153E+05-2.937E+05

38、1.496E+04-1.070E+048.699E+05-2.004E+05B26P1.861E+064.625E+051.070E+06-7.863E+051.621E+06-7.036E+054.407E+05-3.416E+054.916E+066.887E+05M3-8.386E+04-3.680E+034.775E+04-3.565E+045.755E+05-9.595E+051.798E+04-1.364E+044.797E+05-9.880E+05 腹杆内力表 表2-3单元号内力情况一期恒载二期恒载城-A轻轨人群内力组合轴力最大弯矩最大轴力最小弯矩最小maxminmaxminma

39、xminA1B1P-1.23E+06-1.41E+065.31E+05-1.64E+063.52E+05-8.67E+051.85E+05-2.83E+05-1.79E+06-5.02E+06M32.50E+055.05E+034.97E+05-3.44E+051.52E+05-9.47E+047.81E+04-8.35E+048.23E+05-1.51E+05A1B2P6.84E+059.68E+051.61E+06-7.72E+051.13E+06-5.16E+053.16E+05-2.19E+054.11E+063.40E+05M33.68E+045.99E+035.20E+05-3.9

40、1E+053.68E+05-1.26E+059.63E+04-7.74E+048.36E+05-4.23E+05A2B2P-1.13E+05-3.71E+057.92E+05-1.66E+065.33E+05-7.11E+052.25E+05-2.58E+057.59E+05-2.70E+06M3-3.87E+045.68E+037.42E+05-5.09E+053.65E+05-1.15E+059.91E+04-1.09E+059.26E+05-6.00E+05A2B3P-8.09E+05-2.42E+059.99E+05-1.21E+067.06E+05-5.29E+052.03E+05-

41、2.28E+054.86E+05-2.71E+06M3-5.89E+045.65E+037.31E+05-5.07E+054.35E+05-1.16E+059.67E+04-8.59E+049.59E+05-6.02E+05A3B3P1.47E+068.37E+051.22E+06-1.02E+065.41E+05-3.52E+052.62E+05-1.74E+053.90E+061.01E+06M3-8.22E+048.23E+037.12E+05-5.02E+054.03E+05-1.13E+058.67E+04-7.16E+048.88E+05-6.06E+05A3B4P-2.37E+0

42、6-1.43E+065.66E+05-1.78E+063.57E+05-5.27E+051.58E+05-3.01E+05-2.94E+06-5.97E+06M3-1.12E+056.92E+037.01E+05-5.00E+054.20E+05-1.11E+057.89E+04-8.01E+048.58E+05-6.41E+05A4B4P3.03E+062.02E+061.81E+06-6.01E+058.54E+05-1.40E+053.58E+05-1.51E+057.44E+064.31E+06M3-1.13E+051.78E+047.04E+05-4.98E+054.23E+05-1

43、.14E+058.45E+04-7.39E+048.77E+05-6.26E+05A4B5P-4.01E+06-2.63E+063.57E+05-2.51E+061.61E+05-8.47E+051.66E+05-4.31E+05-6.10E+06-9.79E+06M3-1.72E+059.09E+037.36E+05-5.12E+054.05E+05-1.30E+059.43E+04-8.54E+048.24E+05-7.28E+05A5B5P4.67E+063.27E+062.57E+06-3.99E+051.36E+06-4.52E+045.14E+05-1.82E+051.15E+07

44、7.41E+06M3-1.81E+053.02E+047.49E+05-5.42E+054.35E+05-1.38E+051.13E+05-9.52E+048.87E+05-7.53E+05A5B6P-5.23E+06-3.54E+064.54E+05-3.23E+065.58E+04-1.32E+062.15E+05-5.72E+05-8.22E+06-1.31E+07M3-3.48E+055.28E+037.91E+05-5.55E+052.54E+05-1.07E+051.16E+05-1.12E+055.66E+05-9.40E+05A6aB6P4.44E+062.88E+062.49

45、E+06-4.25E+051.40E+06-3.87E+044.95E+05-1.87E+051.08E+076.78E+06M3-2.38E+053.16E+048.24E+05-6.10E+056.37E+05-1.92E+051.59E+05-1.55E+051.10E+06-9.53E+05A6aBzP-6.47E+06-4.31E+066.58E+05-3.78E+067.16E+04-1.81E+063.16E+05-7.66E+05-9.98E+06-1.62E+07M3-1.14E+05-7.59E+036.41E+05-4.93E+055.94E+05-2.50E+051.86E+05-1.89E+051.03E+06-8.59E+05A6bBzP-9.40E+06-5.55E+067.62E+0