圓形鋼管規(guī)格及截面特征表

1304.541690.387.951304.541690.387.957.95直徑(mm)(in)外徑D(mm)壁厚t(mm)40483.550702i576075.7768088.5891081001141331251501401593.53.53.84.05.04.04.05.04.06.04.04.06.04.54.56.0圓形鋼管規(guī)格及截面特征表表2-92截面特征截面面

積

(cm2)理論重量(kg/m)外表面積(m2/m)毛截面

慣性矩I(cm4)毛截面抵抗矩W(cm3)回轉(zhuǎn)半

徑i(cm)抗扭慣

性矩Ik

(cm4)截面重

心到邊

緣距離Z0(cm)4.893.840.1515.886.218.569.0511.1510.6210.6813.2013.0719.2313.8216.2123.9419.1621.8428.844.624.886.647.108.758.348.409.2410.3015.0910.8512.7318.7915.4017.1522.640.1790.1880.2370.2390.2390.2780.2800.2800.3390.3390.3580.4180.4180.4100.5000.50021.1424.8855.1658.8170.6294.9996.68116.79176.95250.90209.35339.53483.72440.12652.27845.197.428.3014.5915.4818.5921.4421.7326.2432.7740.4636.7350.7672.7462.8782.05106.311.902.002.542.552.522.993.012.983.683.613.894.564.504.795.465.4242.2749.77110.32117.62141.25189.97193.36233.58353.91501.81418.70675.05967.43880.242.853.003.783.803.804.434.454.455.405.405.706.656.657.00165219200825010273300123254.56.9908.011.08.013.022.6940.1559.3866.6890.6279.67124.4217.8131.5246.6152.2871.0962.54100.030.5180.6880.6880.8580.8581.0211.021731.212278.743279.135851.737782.5610013.9415531.7888.63208.10299.46428.70570.15616.24955.805.687.537.439.379.2711.2111.041462.414557.596558.2511702.4615565.1120027.8131063.578.2510.9510.9513.6513.6516.2516.25注：I――毛截面慣性矩；w――毛截面抵抗矩；i――回轉(zhuǎn)半徑；ik――抗扭慣性矩；z0――截面重心到邊緣距離。注：2-5-3鋼管結(jié)構(gòu)計(jì)算1．適用于不直接承受動力荷載，在節(jié)點(diǎn)處直接焊接的鋼管桁架結(jié)構(gòu)。鋼管外徑與壁厚之比，不應(yīng)超過100(空)。軸心受壓方管或矩形管的最大外緣尺寸與壁厚之比，不應(yīng)超40竺。f\fy1y2．鋼管節(jié)點(diǎn)的構(gòu)造應(yīng)符合下列要求：主管外徑應(yīng)大于支管外徑，主管壁厚不應(yīng)小于支管壁厚。在支管與主管連接處不得將支管穿入主管內(nèi)。主管和支管或兩支管軸線之間的夾角0i不宜小于30。。支管與主管的連接節(jié)點(diǎn)處，應(yīng)盡可能避免偏心。支管與主管的連接焊縫，應(yīng)沿全周連續(xù)焊接并平滑過渡。支管端部宜用自動切管機(jī)切割，支管壁厚小于6mm時可不切坡口。3．支管與主管的連接可沿全周用角焊縫，也可部分用角焊縫、部分用對接焊縫，支管管壁與主管管壁之間的夾角大于或等于120。ii的區(qū)域宜用對接焊縫或帶坡口的角焊縫。角焊縫的焊腳尺寸hf不宜大于支管壁厚的兩倍。4.支管與主管的連接焊縫為全周角焊縫，按下式計(jì)算，但取Bf=l：角焊縫的有效厚度he,當(dāng)支管軸心受力時取0.7hf。(1)在圓管結(jié)構(gòu)中取支管與主管相交線長度：◎二<€fwfhlff

ew角焊縫的計(jì)算長度lw，按下列公式計(jì)算:lw=(3.25^-0.025(/)當(dāng)-[>0.65時式中d、d———主管和支管外徑；9———主管軸線與支管軸線的夾角。(2)在矩形管結(jié)構(gòu)中，支管與主管交線的計(jì)算長度，對于有間隙的K形和N形節(jié)點(diǎn):^4+0.466SJD7;0.534(3.81^,-0.389^)-^-+0.466對于T、Y、X形節(jié)點(diǎn)當(dāng)存6(T時2hi一sin?式中hi、bi——分別為支管的截面高度和寬度。5．為保證節(jié)點(diǎn)處主管的強(qiáng)度，支管的軸心力不得大于表2-95規(guī)定的承載力設(shè)計(jì)值支管軸心力的承載力設(shè)計(jì)值表2-95

序號節(jié)點(diǎn)類別計(jì)算內(nèi)容計(jì)算公式備注1X形節(jié)點(diǎn)受壓支管在管節(jié)點(diǎn)處的承載力設(shè)計(jì)值N*-血@畑『松=1-0.3方7.3(方『愛拉支管在管節(jié)點(diǎn)處的承載力設(shè)計(jì)值NK=O+78(^-)O2NS2T形、Y形節(jié)點(diǎn)受壓支管在管節(jié)點(diǎn)處的承載力後計(jì)值咼=乂款:)WfpWO+百時^d=0.069+0.93/3/3>0.7時丸=邛7?陰受拉支管在管節(jié)點(diǎn)處的承載丈設(shè)計(jì)值056時N唏=1.4NFj3>0.6時N#(2-閃N”3監(jiān)形節(jié)點(diǎn)受壓支管在管節(jié)點(diǎn)處的承載力設(shè)計(jì)值噸乎廣％如川fr「12氛11(1-0.77/9)載力設(shè)計(jì)值昭黔?皚4TT形節(jié)點(diǎn)受壓立管柱管節(jié)點(diǎn)處的卓載力設(shè)計(jì)值略二列N作^E=1.28-0.64-^<E1蓉為兩支管的橫向間距受拉支管在管節(jié)點(diǎn)處的承載力設(shè)計(jì)值吩昭5KK形節(jié)點(diǎn)受壓支管在管節(jié)點(diǎn)處的承載力設(shè)計(jì)值昭59N?受拉支管在管節(jié)點(diǎn)處的承載力設(shè)計(jì)值注：表中符號U&——支管外徑與主管外徑之比；嘰——參數(shù)；t——主管壁厚；/——鋼材的抗拉、抗壓和抗彎強(qiáng)度設(shè)計(jì)值,“一主管最大軸向應(yīng)力（拉應(yīng)力為正，壓應(yīng)力為負(fù)卄⑷——蟄數(shù)*氐——主管軸線與支管軸線的夾角*氏——受壓支管軸線與主管柚線的夾角業(yè)參數(shù)7?——兩支管間的間隙，