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/mm2单根钢筋理论 重量 /（kg/m）123456789628.357851131421701982262550.2226.533.2661001331661992322652990.260850.31011512012523023524024530.3958.252.81061582112643173704234750.4321078.51572363143934715506287070.61712113.122633945256567879190410170.88814153.93084616157699231077123

2、113851.2116201.1402603804100512061407160818091.5818254.55097631017127215271781203622902.0020314.26289421256157018842199251328272.4722380.176011401520190022812661304134212.9825490.998214731964245429453436392744183.8528615.8123218472463307936954310492655424.8332804.2160924133217402148265630643472386.3

3、1361017.9203630544072508961077125814391617.99401256.625133770502762837540879610053113109.8750196439285892785698201178413748157121767615.42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-

4、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

5、距 /mm当钢筋直径 /mm 为下列数值时的钢筋截面面积 /mm234566/888/101010/121212/141414/16167010117928140456171992011211369161619082199253628727594.316726237751467185910471277150817802053236726818088.41572453544916298059811198141416691924221825138583.21482313334625927589241127133115711811208823659078.5140218314437559716872

6、1064125714841710197222349574.513220729841452967882610081190140516201868211610070.61261962833935036447859581131133515391775201111064.21141782573574575857148711028121413991614182812058.9105163236327419537654798942111212831480167612556.5100157226314402515628766905106812321420160813054.496.6151218302387

7、495604737870102711841366154714050.589.714020228135946056168480895411001268143615047.183.813118926233542952363975489010261183134016044.178.51231772463144034915997078349621110125717041.573.91151662312963794625646657869061044118318039.269.8109157218279358436532628742855985111719037.266.1103149207256339

8、413504595702810934105820032.362.898.2141196251322393479565668770888100522032.157.189.312917822829235743651460770080791424029.452.481.911816420926832739947155664174083825028.350.278.511315720125831538345353461671083426027.248.375.510915119324830236843551459268277328025.244.970.11011401802302813424044

9、7755063471830023.641.966.59413116821526232037744551359267032022.139.261.488123157201245299353417481554628注：表中钢筋直径中的 6/8，8/10 等系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

10、/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/mm2）（混凝土结构设计规范 GB50010-2002）强度 种类符号混凝土强度等级C15C20C25C30C35C40C45C50C55C60C6

11、5C70C75C80强度 标准值fck10.013.416.720.123.426.829.632.435.538.541.544.547.450.2ftk1.271.541.782.012.202.392.512.642.742.852.932.993.053.11强度 设计值fc7.29.611.914.316.719.121.123.125.327.529.731.833.835.9fk0.911.101.271.431.571.711.801.892.042.142.092.142.182.22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

12、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 Ee 疲劳变形模量 Ecf （ 104N /mm2）（混凝土结构设计规范 GB50010-2002）模量 种类混凝土强度等级C15C20C25C30C35C40C45C50C55C60C65C70C75C80Ee2.202.552.803.003.153.253.353.453.553.603.653.703.753.80Ecf1.11.21.31.41.51.551.61.651.71.751.81.851.9普通钢筋强度设计值（ N /mm2）混凝土结构设计规范 GB50010-2002）种类符号fyfy'热轧钢筋HPB235(Q253)210210HRB335(20MnSi)300300HRB(20MnSiv 、 20MnSiNb 、20MnTi)360360RRB400(K20MnSi)360360注：在钢筋混凝土结构中，轴心受拉和小