电缆桥架支架的标准

电缆桥架支架的标准1支吊架设计依据1.1《建筑工程施工质量统一验收标准规范》GB50300—20131.2《建筑电气安装工程施工及验收规范》GB50303—20021.3国家建筑标准设计图集《室内管道支架和吊架》03S4021.4国家建筑标准设计图集《电缆桥架安装》04D701—32桥架支吊架计算过程支吊架的设计过程中主要考虑一下几种荷载：垂直荷载、水平荷载。支吊架计算成果主要包括支吊架的间距计算、支吊架横杆计算、支吊架吊杆计算；其中，单根各种规格桥架支吊架横杆及支吊架吊杆见下表：支吊架规格及支架吊杆对应表序号桥架规格支架/吊杆宽mm高mm500730800100012001300140015001600型钢选型支架吊杆支架吊杆支架吊杆支架吊杆支架吊杆支架吊杆支架吊杆支架吊杆支架吊杆1100500.360.450.360.360.360.720.360.900.361.090.361.180.361.270.361.360.361.45∟40*40*4/φ1021001000.360.450.360.660.360.720.360.900.361.090.361.180.361.270.361.360.361.45∟40*40*4/φ1031501000.440.450.440.660.440.720.440.900.441.090.441.180.441.270.441.360.441.45∟40*40*4/φ1042001000.530.450.530.660.530.720.530.900.531.090.531.180.531.270.531.360.531.45∟40*40*4/φ1053001000.650.650.650.950.651.040.651.300.651.560.651.690.651.820.651.950.652.08∟40*40*4/φ1263001500.710.650.710.950.711.040.711.300.711.560.711.690.711.820.711.950.712.08∟40*40*4/φ1274001000.810.650.810.950.811.040.811.300.811.560.811.690.811.820.811.950.812.08∟40*40*4/φ1284001500.890.650.890.950.891.040.891.300.891.560.891.690.891.820.891.950.892.08∟40*40*4/φ1294002000.890.650.890.860.891.040.891.300.891.560.891.690.891.820.891.950.892.08∟40*40*4/φ12105001000.890.650.890.950.891.040.891.300.891.560.891.690.891.820.891.950.892.08∟40*40*4/φ12116001001.240.651.240.951.241.041.241.301.241.561.241.691.241.821.241.951.242.08∟40*40*4/φ12126001501.240.651.240.951.241.041.241.301.241.561.241.691.241.821.241.951.242.08∟40*40*4/φ12136002001.240.651.240.951.241.041.241.301.241.561.241.691.241.821.241.951.242.08∟40*40*4/φ12148001002.491.782.492.592.492.842.493.552.494.262.494.622.494.972.494.622.495.68∟50*50*5/∟40*40*4158001502.491.782.492.592.492.842.493.552.494.262.494.622.494.972.494.622.495.68∟50*50*5/∟40*40*4168002002.491.782.492.592.492.842.493.552.494.262.494.622.494.972.494.622.495.68∟50*50*5/∟40*40*41710001003.041.783.042.593.042.843.043.553.044.263.044.623.044.973.044.623.045.68∟50*50*5/∟40*40*41810001503.041.783.042.593.042.843.043.553.044.263.044.623.044.973.044.623.045.68∟50*50*5/∟40*40*41910002003.041.783.042.593.042.843.043.553.044.263.044.623.044.973.044.623.045.68∟50*50*5/∟40*40*42012001003.591.783.592.593.592.843.593.553.594.263.594.623.594.973.594.623.595.68∟50*50*5/∟40*40*42112001503.951.783.952.593.952.843.953.553.954.263.954.623.954.973.954.623.955.68∟50*50*5/∟40*40*42212002003.951.783.952.593.952.843.953.553.954.263.954.623.954.973.954.623.955.68∟50*50*5/∟40*40*42.1支吊架间距间距系指管道的跨度，一般管道的最大支吊架间距是按强度条件和刚度（或挠度）条件计算决定。在两者中，选择其数值小的作为管道的最大间距值；按刚度条件水平管道支吊架最大允许间距EQL=\f(1,10)\r(,\f(EI△,W))=\f(1,10)\r(,\f(198*96.68*15,8.385*10))=5.852m按强度条件水平管道支吊架最大允许间距EQL=\r(,\f(Z[σ],W))=\r(,\f(21.73*110,8.385*10))=5.339m式中：L—水平管道支吊架的间距（单位：m）；E—管材在热态下的弹性模量（单位：kN/mm²）：取值196~206，取值198kN/mm²；I—管材的截面惯性矩（单位：cm4）；W—管材的单位长度重量（单位：kN/m）；△—管材在跨中的挠度（单位：mm），一般选用挠度在10~20mm之间选取；15Z—管材的截面模量（单位：cm3）；☌—热态下钢管受到重力荷载部分的许用应力（单位：MPa）；2.2吊杆计算吊杆按轴心受位构件计算，并考虑一定的腐蚀余量，按照下式计算，满足国标GB/T17116.3EQAn≥\f(1.5*N,0.85f)=\f(1.5*(8.385)*9.8,0.85)=145.011=>10式中：An—吊杆截面面积（单位：mm2）；N—吊杆拉力设计值（N）；f—钢材强度设计值（N/mm2）；吊杆使用最大荷载吊杆直径101216202430拉力允许值3250472590001400020000325002.3横梁计算横梁计算主要是承受和管道的荷载，故其受力形式为弯剪受力，分别计算其受弯和受剪应力，然后确定横梁是否满足受力要求。弯曲应力计算式中γx、γy—截面塑性发展系数：对于普通碳素结构钢，一般取值：1.05；Mx、My—所验算截面绕x轴和绕y轴的弯矩（N*mm）；Wx、Wy—截面对x轴和对y轴的净截面抵抗矩（mm3）；f—钢材强度设计值（N/mm2）（2）剪应力计算式中t—抗剪强度（N/mm2）；V—计算截面沿腹板平面作用的剪力；S—计算剪力处以上毛截面最中州的面积矩（mm3）;Ix—截面惯性矩（mm4）；Tw—腹板厚度（mm）