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1、混凝土强度设计值（N/mm2）强度种类混 凝 土 强 度 等 级C15C20C25C30C35C40C45C50C55C60C65C70C75C80fc7.29.6 11.914.316.719.121.123.125.327.529.731.833.835.9ft0.911.101.271.431.571.711.801.891.962.042.092.142.182.22混凝土强度标准值（N/mm2） 强度种类符号混 凝 土 强 度 等 级C7.5C10C15C20C25C30C35C40C45C50C55C60轴心抗压fck56.7 10 13.5 17 20 23.5 27 29.5
2、32 34 36 弯曲抗压fcmk5.5 7.5 11 15 18.5 22 26 29.5 32.5 35 37.5 39.5 抗 拉ftk0.75 0.9 1.2 1.5 1.75 2 2.25 2.45 2.6 2.75 2.85 2.95 纵向受力钢筋混凝土保护层最小厚度（mm）环境类别板、墙、壳梁、柱、杆柱C20C25C45C50C20C25C45C50C20C25C45C50一201515252020二a252020302525b302520403530三353025454035注：基础中纵向受力钢筋的混凝土保护层厚度不应小于40mm，当无垫层时不应小于70mm。现浇钢筋混凝土房屋
3、适用最大高度（m）结构体系抗 震 设 防 烈 度6789框 架 60554525框架抗剪墙13012010050抗震墙14012010060部分框支抗震墙12010080不应采用框架核心筒15013010070筒中筒18015012080板柱抗震墙403530不应采用注：1.房屋高度指室外地面到主要屋面板板顶的高度（不包括局部突出屋顶部分）；2.框架核心筒结构指周边稀柱框架与核心筒组成的结构；3.部分框支抗震墙结构指首层或底部两层框支抗震墙结构；4.乙类建筑可按本地区抗震设防烈度确定适用的最大高度；5.超过表内高度的房屋，应进行专门研究和论证，采取有效的加强措施。钢筋的计算截面面积及公称质量表
4、直径d（mm）不同根数直径的计算截面面积（mm2）单根钢筋公称质量（kg/m）12345678934566.57.112.619.628.333.214.125.139576621.237.75985100 28.350.37911313335.362.89814116642.475.4118170199 49.588.0137198232 56.5100.5157226265 63.6113.1177254299 0.05550.09860.1540.2220.26088.210121450.352.878.5113.1153.9 101106157226308 15115823633946
5、2 201211314452616 251264393565770 302317471679924 3523705507921078 4024226289051232 45247570710181385 0.3950.4150.6170.8881.208 1618202225201.1254.5314.2380.1490.9402509628760982 60376394211401473 8041018125715211963 10051272157119012454 12061527188522812945 14071781219926613436 16082036251330413927
6、 18102290282734214418 1.5781.9982.4662.9843.853 28323640615.8804.21017.91256.6 1232160820362513 1847241330543770 2463321740725027 3079402150896283 3695482561077540 4310563071258796 49266434814310053 55427238916111310 4.8346.3137.9909.865 每米板宽内的钢筋截面面积表 钢筋间距（mm）当钢筋直径（mm）为下列数值时的钢筋截面面积（mm2）44.5568101214
7、161820222570758090100180168157140126227212199177159280262245218196404377353314283718670628559503112210479828737851616150814141257113121992053192417101539287226812513223420113635339331812827254544884189392734913142543050684752422438017012654561365454490911012012513014015011410510197908414513312712211
8、410617816415715114013125723622621720218845741940238735933571465462860456152410289429058708087541399128312321184110010261828167616081547143613402313212120361957181816962856261825132417224420943456316830412924271525344462409139273776350632721601701751801902007974727066639994918884801231151121091039817
9、7166162157149141314296287279265251491462449436413392707665646628595565962906880855810770125711831149111710581005159014971454141413391272196318481795174516531571237622362172211220011901306828872805272725842454250300504264537965113942011683142624523776165138046701018848125710471521126719631636钢筋间距44.5
10、5681012141618202225混凝土板每m最小配筋率配筋面积级钢（最小配箍率取0.45ft/fc与0.2%取较大值）板厚C20（0.236%）C25（0.272%）C30（0.306%）C35（0.336%）80189218245269100236272306336120283326367403130307354398437150354408459504180425489551605混凝土板每m最小配筋率配筋面积级钢板厚C20（0.2%）C25（0.2%）C30（0.215%）C35（0.236%）80160160172189100200200215236120240240258283130260260280307150300300323354180360360387425混凝土板每m最小配筋率配筋面积级钢板厚C20（0.2%）C25（0.2%）C30（0.2%）C35（0.2%）80160160160160100200200200200120240240240240130260260260260150300300300300180360360360360梁 内 钢 筋 排 成 一 排 时的 钢 筋 最 多 根 数梁宽（mm）2002
