钢筋计算截面面积及理论重量

1、钢筋计算截面面积及理论重量公称直径/mm不同根数钢筋的计算截面积/mm单根钢筋理论重量/(kg/m)123456789628.357851131421701982262550.2226.533.2661001331661992322652990.260850.31011512012523023524024530.3958.252.81061582112643173704234750.4321078.51572363143934715506287070.61712113.122633945256567879190410170.88814153.93084616157699231077123113851.2116201.1402603804100512061407160818091.5818254.55097631017127215271781203622902.0020314.26289421256157018842199251328272.4722380.176011401520190022812661304134212.9825490.998214731964245429453436

2、392744183.8528615.8123218472463307936954310492655424.8332804.2160924133217402148265630643472386.31361017.9203630544072508961077125814391617.99401256.625133770502762837540879610053113109.8750196439285892785698201178413748157121767615.42注：表中直径d=8.2mm的计算截面面积及理论重量仅适用于有纵肋的热处理钢筋。纵向受力钢筋的混凝土保护层最小厚度（mm）（混凝土结构设计规范GB50010-2002）环境类别板、墙、壳梁柱C20C25C45C50C20C25C45C50C20C25C45C50一201515302525303030二a-2020-3030-3030b-2520-3530-3530三-3025-4035-4035注：基础中的纵向受力钢筋的混凝土保护层厚度不应小于40mm；当午垫层时不应小于70mm；处于一类环境且由工厂生产的预制构件，当混凝土强

3、度等级不低于C20时，其保护层厚度可按本规定减少5mm，但预应力钢筋的保护层厚度不应小于15mm；处于二类环境且由工厂生产的预制构件，当表面采取有效保护措施时，保护层厚度可按本表中的一类环境值取用；预制钢筋混凝土受弯构件钢筋端头的保护层厚度不用小于10mm；预制肋形板主肋钢筋的保护层厚度应按梁的数值取用。每米板宽各种钢筋间距时的钢筋截面面积（房建结构）钢筋间距/mm当钢筋直径/mm为下列数值时的钢筋截面面积/mm34566/888/101010/121212/141414/161670758085909510010194.388.483.278.574.570.617916715714814013212628126224523121820719640437735433331429828356151449146243741439371967162959255952950392085980575871667864411211047981924872826785136912771198112710641008958161615081414133112571190113119081780166

4、9157114841405133521992053192418111710162015392536236722182088197218681775287226812513236522342116201111012012513014064.258.956.554.450.511410510096.689.71781631571511402572362262182023573273143022814574194023873595855375154954607146546286045618717987667376841028942905870808121411121068102795413991283123211841100161414801420136612681828167616081547143615016017018019020047.144.141.539.237.232.383.878.573.969.866.162.813112311510910398.218917716615714914126224623121820719633531429627925625142940337

5、9358339322523491462436413393639599564532504479754707665628595565890834786742702668102696290685581077011831110104498593488813401257118311171058100522024025026028030032032.129.428.327.225.223.622.157.152.450.248.344.941.939.289.381.978.575.570.166.561.41291181131091019488178164157151140131123228209201193180168157292268258248230215201357327315302281262245436399383368342320299514471453435404377353607556534514477445417700641616592550513481807740710682634592554914838834773718670628注：表中钢筋直径中的6/8，8/10等系

6、指两种直径的钢筋间隔放置。钢筋排成一行时梁的最小宽度（房建结构）钢筋直径/mm3根4根5根6根7根12180/150200/180250/22014180/150200/180250/220300/30016180/180220/200300/250350/300400/35018180/180250/220300/300350/300400/35020200/180250/220300/300350/350400/40022200/180250/250350/300400/350450/40025220/200300/250350/300450/350500/40028250/220350/300400/350450/400550/45032300/250350/300450/400550/450注：斜线以左数值用于梁的上部，以右数值用于梁的下部。混凝土强度设计值和强度标准值（N/mm）（混凝土结构设计规范GB50010-2002）强度种类符号混凝土强度等级C15C20C25C30C35C40C45C50C55C60C65C70C75C80强度标准值10.013.416.720.123.426.829.632.435.538.541.544.547.450.21.271.541.782.012.202.392.512.642.742.852.932.993.053.11强度设计值7.29.611.914.316.719.121.123.125.327.529.731.833.835.90.911.101.271.431.571.711.801.892.042.142.092.142.182.22注：（1）计算现浇钢筋混凝土轴心受压及偏心受压构件时，如截面的长边或直径小于300mm，则表中混凝土的强度设计值应乘以系数0.8，当构件质量（如混凝土成型、截面轴线尺寸等）确有保证时，可不受此限制。 （2）离心混凝土的结构强度设计值应按专门标准取用。混凝土弹性模量 疲劳变形模量（）

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