鋼筋計算截面面積及理論重量

1、鋼筋計算截面面積及理論重量公稱直徑/mm不同根數(shù)鋼筋的計算截面積/mm2單根鋼筋理論 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：表中直徑 d=8.2mm 的計算截面面積及理論重量僅適用于有縱肋的熱處理鋼筋。縱向受力鋼筋的混凝土保護(hù)層最小厚度（ mm）（混凝土結(jié)構(gòu)設(shè)計規(guī)范 GB50010-2002）環(huán)境 類別板、墻、殼梁柱C20C25C45C50C20C25C45C50C20C25C45C50一201515302525303030二a-2020-

4、3030-3030b-2520-3530-3530三-3025-4035-4035注：基礎(chǔ)中的縱向受力鋼筋的混凝土保護(hù)層厚度不應(yīng)小于 40mm ；當(dāng)午墊層時不應(yīng)小于 70mm ；處于一類環(huán)境且由工廠生產(chǎn)的預(yù)制構(gòu)件， 當(dāng)混凝土強(qiáng)度等級不低于 C20 時，其保護(hù)層厚度可按本規(guī) 定減少 5mm ，但預(yù)應(yīng)力鋼筋的保護(hù)層厚度不應(yīng)小于15mm；處于二類環(huán)境且由工廠生產(chǎn)的預(yù)制構(gòu)件，當(dāng)表面采取有效保護(hù)措施時，保護(hù)層厚度可按本表中的一類環(huán)境值取用；預(yù)制鋼筋混凝土受彎構(gòu)件鋼筋端頭的保護(hù)層厚度不用小于10mm ；預(yù)制肋形板主肋鋼筋的保護(hù)層厚度應(yīng)按梁的數(shù)值取用。每米板寬各種鋼筋間距時的鋼筋截面面積（房建結(jié)構(gòu)）鋼筋 間

5、距 /mm當(dāng)鋼筋直徑 /mm 為下列數(shù)值時的鋼筋截面面積 /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：表中鋼筋直徑中的 6/8，8/10 等系指兩種直徑的鋼筋間隔放置。鋼筋排成一行時梁的最小寬度（房建結(jié)構(gòu)）鋼筋直徑 /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：斜線以左數(shù)值用于梁的上部，以右數(shù)值用于梁的下部?；炷翉?qiáng)度設(shè)計值和強(qiáng)度標(biāo)準(zhǔn)值（ N/mm2）（混凝土結(jié)構(gòu)設(shè)計規(guī)范 GB50010-2002）強(qiáng)度 種類符號混凝土強(qiáng)度等級C15C20C25C30C35C40C45C50C55C60C6

11、5C70C75C80強(qiáng)度 標(biāo)準(zhǔn)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強(qiáng)度 設(shè)計值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）計算現(xiàn)澆鋼筋混凝土軸心受壓及偏心受壓構(gòu)件時，如截面的長邊或直徑小于300mm ，則

12、表中混凝土的強(qiáng)度設(shè)計值應(yīng)乘以系數(shù)0.8，當(dāng)構(gòu)件質(zhì)量（如混凝土成型、截面軸線尺寸等）確有保證時，可不受此限制。2）離心混凝土的結(jié)構(gòu)強(qiáng)度設(shè)計值應(yīng)按專門標(biāo)準(zhǔn)取用。混凝土彈性模量 Ee 疲勞變形模量 Ecf （ 104N /mm2）（混凝土結(jié)構(gòu)設(shè)計規(guī)范 GB50010-2002）模量 種類混凝土強(qiáng)度等級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普通鋼筋強(qiáng)度設(shè)計值（ N /mm2）混凝土結(jié)構(gòu)設(shè)計規(guī)范 GB50010-2002）種類符號fyfy'熱軋鋼筋HPB235(Q253)210210HRB335(20MnSi)300300HRB(20MnSiv 、 20MnSiNb 、20MnTi)360360RRB400(K20MnSi)360360注：在鋼筋混凝土結(jié)構(gòu)中，軸心受拉和小