菜园坝长江大桥钢桁梁设计计算书(420m钢拱桥).doc

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1、.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强度检算时根据桥规，主+次制动力（或

2、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组合详见表2-2、表2-3、

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项目检算内容检算杆件1刚度各类

4、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、图2-2、图2-3、图2-4

5、。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. 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+04-2.069E+042.157E+061.687E+06B1

6、B2P1.033E+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+055.956E+061.243E+06M3-2.578E

7、+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+05-9.657E+04B3P1.343E+059.836E

8、+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+06M31.235E+057.232E+038.155

9、E+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+05B4B5P-2.875E+06-9.764E+051.346E+

10、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+07M3-9.520E+041.837E+041.081E+05-9.7

11、48E+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+07-6.901E+064.609E+05-2.829E

12、+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+06-3.875E+051.247E+05-6.944E+052.

13、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+06-2.833E+069.851E+05-2.199E+063.

14、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+047.958E+04-1.521E+054.529E+05-

15、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+06-5.690E+052.890E+06-5.614E+0

16、57.585E+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+047.745E+05-1.737E+055.719E

17、+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+053.808E+06-4.687E+051.068E+06-3

18、.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+05-8.673E+056.593E+04-2.621E+048.07

19、2E+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+051.277E+06-5.895E+053.091E+072

20、.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+04-2.832E+041.418E+062.306E+05B

21、13P1.377E+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+052.507E+071.749E+07M34.066E

22、+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+05-7.390E+05B14B15P9.722E+062.44

23、0E+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+06M38.866E+044.122E+041.563E

24、+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+05B16P0.000E+00-4.748E+068.835E+05

25、-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+06M30.000E+00-1.560E+048.277E+04-1

26、.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+06B17B18P8.938E+04-3.370E+066.976E+05-1

27、.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+05-4.734E+033.456E+04-5.338E

28、+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+05-1.054E+061.064E+06-1.438E+0

29、61.587E+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+04-1.602E+034.808E+04-5.670E+048.

30、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+05-4.324E+051.204E+06-1.415E+061.9

31、18E+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+036.069E+04-6.577E+045.893E+05-9

32、.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+06-1.211E+062.008E+06-1.548

33、E+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+04-4.801E+048.269E+05-3.048E+051.

34、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+061.865E+06-1.331E+064.717E

35、+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+05-9.546E+051.977E+04-1.685

36、E+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+06-6.758E+054.364E+05-3.417E+054

37、.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+051.496E+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