工字钢抗弯强度计算,工字钢抗弯强度计算公式

('工字钢抗弯强度计算方法一、梁的静力计算概况1、单跨梁形式：简支梁2、荷载受力形式：简支梁中间受集中载荷3、计算模型基本参数：长L=6M4、集中力：标准值Pk=Pg+Pq=40+40=80KN设计值Pd=PgγG+PqγQ=401.2+401.4=104KN二、选择受荷截面1、截面类型：工字钢：I40c2、截面特性：Ix=23850cm4Wx=1190cm3Sx=711.2cm3G=80.1kg/m翼缘厚度tf=16.5mm腹板厚度tw=14.5mm三、相关参数1、材质：Q2352、x轴塑性发展系数γx：1.053、梁的挠度控制［v］：L/250四、内力计算结果1、支座反力RA=RB=52KN2、支座反力RB=Pd/2=52KN3、最大弯矩Mmax=PdL/4=156KN.M五、强度及刚度验算结果1、弯曲正应力σmax=Mmax/(γxWx)＝124.85N/mm22、A处剪应力τA=RASx/(Ixtw)＝10.69N/mm23、B处剪应力τB=RBSx/(Ixtw)＝10.69N/mm24、最大挠度fmax=PkL^3/481/(EI)=7.33mm5、相对挠度v=fmax/L=1/818.8弯曲正应力σmax=124.85N/mm2<抗弯设计值f:205N/mm2ok!支座最大剪应力τmax=10.69N/mm2<抗剪设计值fv:125N/mm2ok!跨中挠度相对值v=L/818.8<挠度控制值［v］:L/250ok!验算通过！1、弯曲正应力σmax=Mmax/(γxWx)＝124.85N/mm22、A处剪应力τA=RASx/(Ixtw)＝10.69N/mm23、B处剪应力τB=RBSx/(Ixtw)＝10.69N/mm24、最大挠度fmax=PkL^3/481/(EI)=7.33mm5、相对挠度v=fmax/L=1/818.8对于16号工字钢本身，作为一种材料，没有抗弯强度说法。只有抗弯截面模量这个截面特性。当16号工字钢用作梁等构件时，才有抗弯强度问题。16号工字钢抗弯截面模量可查工字钢截面特性表。如作为梁使用的话，求出最大弯矩，除以抗弯截面模量，可得最大应力。如最大应力小于许用弯曲应力，则梁的强度满足要求。我查了一下手头资料，16号工字钢抗弯截面模量，X方向，140.9立方厘米。Y方向，21.1立方厘米。工字钢型号H型钢型号横截面积抗弯强度抗剪强度抗弯刚度惯性半径工字钢型号H型钢型号横截面积抗弯强度抗剪强度抗弯刚度惯性半径ixiyixiyI10H125601.191.361.631.701.200.86I40aH4002000.981.090.791.091.061.64I12.6H150751.001.171.191.391.181.02H4501500.971.110.971.251.131.11I14H175901.081.371.151.711.261.18H4461990.991.200.881.341.161.56I16H175900.890.990.921.081.101.08I40bH4002000.891.040.671.041.081.68H198990.901.160.951.431.261.16H4501500.891.060.831.191.151.14H2001001.061.331.161.671.261.17H4461990.901.140.751.271.191.59I18H2001000.901.010.951.131.121.11H4502001.041.320.851.481.191.62H2481241.071.551.092.131.411.39H5001501.041.351.011.691.271.12I20aH2481249.931.210.911.501.281.31I40cH4002000.820.990.590.991.111.71H2501251.071.381.091.721.281.32H4501500.821.010.721.141.181.15I20bH2481240.831.150.721.421.311.35H4461990.831.090.651.221.221.63H2501250.961.300.861.631.311.35H45020010.951.260.741.411.221.65I22aH2501250.901.050.921.201.161.21H5001500.961.290.891.611.301.15H2981490.991.401.021.901.381.41H4961990.991.420.811.761.341.61I22bH2501250.811.000.741.141.181.23I45aH4502000.951.050.811.051.051.52H2981490.891.330.821.801.411.44H5001500.961.070.971.191.121.05H3001501.021.500.962.051.411.44H4961990.991.180.891.301.151.48I25aH2981490.861.080.841.291.221.36I45bH4502000.871.000.701.001.071.54.H3001500.981.220.991.471.221.36H5001500.881.030.841.141.141.07I25bH2981490.751.030.681.221.251.36H4961990.911.130.751.241.171.50H3001500.891.160.811.391.251.36H5002001.031.280.861.241.181.52H3461740.991.540.872.121.461.64I45cH4502000.811.030.670.961.091.57I28aH3461740.961.280.901.571.281.54H5001500.821.050.801.091.161.09I28bH3461740.871.210.741.501.311.55H4961990.841.160.731.191.191.53H3501751.041.460.871.831.321.58H5002000.951.310.821.351.201.55I32aH3501750.951.130.831.241.151.50H5961991.011.590.971.961.401.45I32bH3501750.871.080.701.181.171.51I50aH5002000.951.030.861.031.041.41H4001500.971.300.891.621.291.23H5961991.021.251.011.491.211.32H3961990.971.390.791.721.331.72I50bH5062011.021.070.831.161.071.47I32cH3501750.801.030.961.131.201.51H5961990.941.200.881.431.231.34H4001500.891.240.771.541.331.23H6002001.501.250.971.611.241.37H3961990.901.330.681.641.361.72I50cH5002000.821.020.710.941.081.46I36aH401500.931.070.901.191.131.19H5062010.941.100.791.121.091.50H3961990.941.150.801.271.161.67H5961990.871.230.841.371.261.36I36bH4001500.851.020.761.131.161.22H6002000.971.290.931.541.271.39H3961990.861.100.681.211.181.70I56aH5961990.900.990.871.061.091.27H4002001.011.290.781.431.191.72H6002001.001.040.961.191.101.29H4501501.001.310.961.641.281.17I56bH6062011.051.140.921.331.131.33H4461991.021.410.861.751.311.63I56cH6002000.861.020.211.091.131.30I36cH3961990.791.050.561.151.211.72H6062010.971.180.891.271.151.33H4002000.931.230.681.371.221.75I63aH5823001.131.100.891.100.992.00H4501500.921.250.831.561.301.18I63bH5823001.041.050.781.051.002.02H4461990.941.350.751.671.341.66I63cH5823000.971.090.761.011.022.03',)