梁板柱配筋率及有关知识

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1、梁板柱配筋率的有关知识一、公式配筋率ρ=As/bho最小配筋率ρmin=As/bho公式说明ho－有效高度ho=h-as（保护层厚度）板的配筋面积As=配筋率×板厚×1米板长(1000)得出构造配筋（板厚应减去保护层厚度）二、经济配筋率ρ1、板0.4%～0.8%2、梁0.6%～1.5%（矩形梁0.85%～1.25%，T形梁1.1%～1.6%）3、柱0.8%～1.2%三、最小配筋率ρmin1、板I级钢0.24%～0.37%II级钢0.2%～0.26%2、梁I级钢0.24%～0.37%II级钢0.2%～0.26

2、%3、柱中柱0.6%～1%角柱0.8%～1.2%非框架柱0.6%四、以下有关表格供查询梁板柱的最小配筋率板最小配筋面积（㎜2）fy=210N/㎜2（I级钢）表（一）板厚(㎜)C20C25C30C35C40as=20㎜as=20㎜as=20㎜as=20㎜as=20㎜ρmin=0.2357%ρmin=0.2722%ρmin=0.3064%ρmin=0.3364%ρmin=0.3664%6094.28108.88122.56134.56146.5670117.85136.10153.20168.20183.208

3、0141.42163.32183.84201.84219.8490165.0190.54214.48235.48256.48100188.6217.76245.12269.12293.12110212.13244.98275.76302.76329.76120235.7272.20306.40336.40366.40130259.3299.42337.04370.04403.04140283.0326.64367.68403.68439.68150306.4353.86398.32437.32476.321

4、60329.98381.08428.96470.96512.96170353.55408.30459.60504.60549.60180377.12435.52490.24538.24586.24190400.69462.74520.88571.88622.88200424.26489.96551.52605.52659.52250542.11626.06704.72773.72842.72300659.96762.16857.92941.921025.92板最小配筋面积（㎜2）fy=300N/㎜2（II级

5、钢）表（二）板厚(㎜)C20C25C30C35C40as=20㎜as=20㎜as=20㎜as=20㎜as=20㎜ρmin=0.2%ρmin=0.2%ρmin=0.2145%ρmin=0.2355%ρmin=0.2565%60808085.8094.2102.6070100100107.25117.75128.2580120120128.70141.30153.9090140140150.15164.85179.55100160160171.6188.40205.20110180180193.05211.95

6、230.85120200200214.50235.50256.50130220220235.95259.05282.15140240240257.40282.60307.80150260260278.85306.15333.45160280280300.30329.70359.10170300300321.75353.25384.75180320320343.20376.80410.40190340340364.65400.35436.05200360360386.10423.90461.702504604

7、60493.35541.65589.95300560560600.60659.40718.20ρmin=45ft/fy(%)ρ=As/b*h0梁最小配筋率fy=210N/㎜2（I级钢）表（三）C20C25C30C35C40as=35㎜as=35㎜as=35㎜as=35㎜as=35㎜ρmin=0.2357%ρmin=0.2722%ρmin=0.3064%ρmin=0.3364%ρmin=0.3664%双排筋as=60㎜    ρ=As/bh0梁最小配筋率fy=300N/㎜2（II级钢）表（四）C20C25C3

8、0C35C40as=35㎜as=35㎜as=35㎜as=35㎜as=35㎜ρmin=0.2%ρmin=0.2%ρmin=0.2145%ρmin=0.2355%ρmin=0.2565%双排筋as=60㎜    ρ=As/bh0as-钢筋保护层厚度说明：以上表中板最小配筋面积据公式ρmin=As/b*h0所以As=ρmin×b×ho其中ho=h-as举例板厚h=100fy=300N/㎜²砼标号C25as=20㎜ρmi