圓形鋼管規(guī)格及截面特征表

1、圓形鋼管規(guī)格及截面特征表表2-92直徑外徑D(mm)壁厚t(mm)截回卸積(cm2)理論重量(kg/m)外表面積(m2/m)截回特征毛截面慣性矩I(cm4)毛截面抵抗矩W(cm3)回轉(zhuǎn)半徑i(cm)抗扭慣性矢1Ik(cm4)截囿重心到邊緣距離Zo(cm)(mm)(in)401?483.54.893.840.151573.55.884.620.17921.147.421.9042.272.85502603.56.214.880.18824.888.302.0049.773.0075.73.88.566.640.23755.1614.592.54110.323.78702?764.09.057.1

2、00.23958.8115.482.55117.623.805.011.158.750.23970.6218.592.52141.253.8088.54.010.628.340.27894.9921.442.99189.974.43803894.010.688.400.28096.6821.733.01193.364.455.013.209.240.280116.7926.242.98233.584.451084.013.0710.300.339176.9532.773.68353.915.4010046.019.2315.090.339250.9040.463.61501.815.40114

3、4.013.8210.850.358209.3536.733.89418.705.701334.016.2112.730.418339.5350.764.56675.056.6512556.023.9418.790.418483.7272.744.50967.436.651404.519.1615.400.410440.1262.874.79880.247.001594.521.8417.150.500652.2782.055.461304.547.9515066.028.8422.640.500845.19106.315.421690.387.951654.522.6917.810.5187

4、31.2188.635.681462.418.2520082196.99.040.1559.3831.5246.610.6880.6882278.743279.13208.10299.467.537.434557.596558.2510.9510.95250102738.011.066.6890.6252.2871.090.8580.8585851.737782.56428.70570.159.379.2711702.4615565.1113.6513.65300123258.013.079.67124.4262.54100.031.0211.02110013.9415531.78616.24

5、955.8011.2111.0420027.8131063.5716.2516.25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；Zo截面重心到邊緣距離。2-5-3鋼管結(jié)構(gòu)計(jì)算1.適用于不直接承受動(dòng)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（234）0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40f2340fy；fy2.鋼管節(jié)點(diǎn)的構(gòu)造應(yīng)符合下列要求:(1)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8i不宜小于300(3)(4)支管與主管的連接節(jié)點(diǎn)處，應(yīng)盡

6、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。(5)支管端部宜用自動(dòng)切管機(jī)切割，支管壁厚小于6mm時(shí)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(duì)接焊縫，支管管壁與主管管壁之間的夾角大于或等于120。hf不宜大于支管壁厚的兩倍的區(qū)域宜用對(duì)接焊縫或帶坡口的角焊縫。角焊縫的焊腳尺寸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”=1：helw角焊縫的有效厚度he,當(dāng)支管軸心受力時(shí)取0.7hf。角焊縫的計(jì)算長(zhǎng)度lw,按下列公式計(jì)算：(1)在圓管結(jié)構(gòu)中取支管與主管相交線長(zhǎng)度：dIn534當(dāng)了0,65時(shí).(3.25/0.0254)+0,466dI0

7、當(dāng)0,65時(shí)時(shí)=(3.81出-0.389)七一+0.466dw*sinPj/式中d、di主管和支管外徑；9i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(zhǎng)度，對(duì)于有間隙的K形和N形節(jié)點(diǎn)：2h當(dāng)仇60。時(shí)lw=-±+bisin。,2h-當(dāng)仇W50'時(shí)兀=匚寸+2gm",對(duì)于T、Y、X形節(jié)點(diǎn)2hisin-i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(hào)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)值吸一（1-0.8邛

8、）sind*f%=1-0.3片0.3田2受拉支管在管節(jié)點(diǎn)處的承載力設(shè)計(jì)值雞=0.78(f)0.2Ng2T形、Y形節(jié)點(diǎn)受壓支管在管節(jié)點(diǎn)處的承毅力設(shè)計(jì)值(f0.2)少&護(hù)fB40.6時(shí)=0.069+0.93/9B>0,7時(shí)“d=2p-0.68受拉支管在管節(jié)點(diǎn)處的承載力設(shè)計(jì)值840.6時(shí)N獸=L4N%B>0.6時(shí)N=(2一田N?3K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(f0.2)以內(nèi)以/2.19Fl-20，；"rT14.7.5b-b+a(1-0.778)受拉支管在管節(jié)點(diǎn)處的承載力設(shè)計(jì)值n"黑M4TT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.受拉支管在管節(jié)點(diǎn)處的承載力設(shè)計(jì)值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NQ0.9N2受拉支管在管節(jié)點(diǎn)處的承載力設(shè)計(jì)值N4=0.9N；j3g=1.28-0.64?1.1g為兩支管的橫向間距注：表中符號(hào)B二d1/d支管外徑與主管外徑之比：電n參數(shù)：t主管壁厚；f鋼材的抗拉、抗壓和抗彎強(qiáng)度設(shè)計(jì)值；。主管最大軸向應(yīng)力（拉應(yīng)力為正，壓應(yīng)力為負(fù)）；視一參數(shù)；仇主管軸線與支管軸線的夾角i仇受壓支管軸線與主