結(jié)構(gòu)用冷彎空心型鋼GBT67281986建筑專業(yè)

1、結(jié)構(gòu)用冷彎空心型鋼（gb/t67281986）   (1)尺寸規(guī)格見表1一表3表1  方形空心鋼的尺寸規(guī)格a一邊長  t一壁厚 r一外圓弧半徑 邊長mm尺寸允許偏差mm壁厚tmm理論質(zhì)量(kgm)截面面積/cm2邊長/mm尺寸允許偏差壁厚t/mm理論質(zhì)量(kgm)截面面積cm2a普通精度較高精度a普通精度較高精度25±o.60±0.301.20.8671.10580±1.40±o.703.07.0719.0081.51.06l1.3524.09.22211.7471.751.2151.5485.o11.2

2、0914.3562.01.3631.73690±1.50±0.753.o8.01310.208302.52.0322.5894.olo.47813.3473.02.3613.0085.012.83916.35640±0.80±o.402.52.8173.5896.o15.09719.2323.03.3034.208100±1.60±0.804.o11.73414.9475.o14.40918.3564.04.1985.3476.o16.98l21.63250±1.00±0.502.53.6024.589120

3、77;1.80±o.904.o14.24618.1473.o4.2455.4085.017.54922.3566.o20.74926.4324.o5.4546.9478.o26.84034.19l60±1.20±0.602.54.3875.589140±2.00±1.004.o16.75821.3473.05.1876.6085.020.68926.3564.06.7lo8.5476.o8.o24.51731.86431.23240.59l5.08.12910.356160±2.40±1.204.019.27024.5477

4、03.o6.1297.8085.o23.82930.3564.o7.96610.1476.o28.28536.0325.09.69912.3568.036.88846.99l表2  矩形空心鋼的尺寸規(guī)格a一長邊 b一短邊 t一壁厚 r一外圓弧半徑邊長mm尺寸允許偏差mm壁厚tmm理論質(zhì)量(kgm)截面面積/cm2ab普通精度較高精度5025±1.00±o.501.21.3381.7051.51.6502.102302.52.8173.5893.o3.3034.2084.04.1985.34760±1.20±0.602.53.2094.0893.

5、o3.7744.8084.04.8266.147402.53.6024.5893.04.2455.4084.05.4546.94770503.o5.1876.6084.o6.7108.5475.o8.12910.3568040±1.40±o.702.54.3875.5893.o5.1876.6084.o6.7lo8.5475.o8.12910.356603.06.1297.8084.o7.966lo.1475.09.69912.3569040±1.50±o.753.o5.6587.2084.o7.3389.3475.o8.91411.356503.o6.

6、1297.8084.07.966lo.1475.o9.69912.356603.06.6008.4084.o8.594lo.9475.o10.48413.35610050±1.60±0.803.o6.6008.4084.08.59410.9475.010.48413.35612060±1.80±o.903.o8.01310.2084.o10.47813.3475.o12.83916.3566.015.09719.232803.08.95511.4084.o11.73414.9475.o14.40918.3566.016.98121.632140±

7、;2.00±1.004.o12.99016.5475.015.97920.3566.018.86524.032150100±2.40±1.204.014.87418.9475.o18.33423.3566.o21.69127.6328.o28.09635.791160804.o14.24618.1475.017.54922.3566.o20.74926.4328.026.84034.19l180100±2.60士1.304.o16.75821.3475.o20.68926.3566.o24.51731.2328.031.86440.5912004.018

8、.01422.9475.o22.25928.3566.o26.40133.6328.o34.37663.79l注：表中理論質(zhì)量按密度為7.85gcm3計算。表3  型鋼彎曲角的外圓弧半徑選用鋼種外圓弧半徑mmt44<t8< div>普通碳素結(jié)構(gòu)鋼2.5t3.0t低合金結(jié)構(gòu)鋼3.ot供需雙方協(xié)議注：型鋼彎曲角度的允許偏差不得大于±1.6°。(2)允許偏差。表4  型鋼的長度允許偏差    (mm)定尺精度長    度允許偏差普通定尺40009000+100o精確定尺40006000+5o>60009000+loo注：1.型鋼允許交付長度不小于2m的短尺，但其質(zhì)量不得大于該批交貨質(zhì)量的5%。      2.型鋼壁厚等于或大于2.5mm時，彎曲度每米不得大于2.5mm，總彎曲度不得大于總長度的o.2。當(dāng)型鋼壁厚小