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1、下料长度=2b+2h-8bhc-4(D+2)d+(D+1)d*3.14*(3*90+2+125)/360+20d计算思路：中心线计算，保护层厚个135度弯弧长+2个弯钩直段长4边直段+3个90度弯弧长+2牌号保护层厚bhc直径D箍筋直径mm公式MPmm681012HPB300252.5d2b+2h-592b+2h-522b+2h-152b+2h+22HRB335255d2b+2h-482b+2h-372b+2h2b+2h44HRB400255d2b+2h-482b+2h-372b+2h2b+2h44HRB500256d2b+2h-442b+2h-322b+2h+102b+2h+52a25d2：
2、25d.b-4.5d-2bhp匸qbh(;2；25d2:25&klb-4.5d-2bhsnnctFJ*+rbJqqHPB300级59521522混凝土结构工程施工规范GB506666-2011反乳5条2款光圆钢筋的弯弧内直径不应小于钢筋直径的2.5倍；所以，HPB300级光面钢筋箍筋展开长度=2b+2h-8bhc+20d-4*4.5d+3占加3.1415927*I.阱90+訓135./360=2b+2h-8bhc+-2d-Fl6.5d=2b+2h-8bhc+185d（外皮此处+2乩2d）当保护层bhc-=：5,箍筋宣径=已丕赴昼虞=b+2h59当保护层bho/=2：5f箍筋直径=8,下料长度=
3、2b+2h-52当保护层bhc=25箍筋直径=10：j下料长度=2b+2h-200+1852b+2h15当保护层=齬盘直径=12,下栄斗长度=2b+2h十率.-vcjrq335MR&级400MP1I级I5db7d2bhchh(;中注)E3f丄盘生ittl4-kifif甜TC0umu_mmb-8d-2bhc/rAMr-caAZw*循助钢助=rf-5JjMPa级混凝土结构工程施工规范GB506666-20115一乩5察4款SOOMP级带肋钢筋的弯弧内直径不应小于钢筋直径的6倍所以，500MPa级帯肋钢筋蛊筋嚴开长度二2b+2h-8bhe+20d-48d+7d3.1415927（3*90+2135）
4、/3602b+2h-8bho-12d+33d=2b+2h-8bhc+2ld（外皮此ib+25.8d）5启q7IPCOI丄bhc善$5d3钾b-7d-2bhc1匚48370044d4db-8cMbhcb44321052推丫混凝土结构设计规范GB500120104.2.条弱款混凝土结拘工錚擴工规韻GB506666-20115.3.53款335MPa级400MBa级带肋钢筋的弯弧内直径不应小于钢筋直径的倍；所以，335MPa蘇400MPn级带肋箍筋無开长度=2b+2h-8bhc+2Od-47d+6d*3.1415927（針90+2學13前/36Q=2b+2h-8bhc-8d+28.3d=2b+2h-8bhc+20,3d（外皮此处+25d）当保护层bhc=25,箍筋直径=釘下料长度=2b+2h48当保护层bhc=25.箍筋直径=&下科长度2b+2h前当保护层bhc=25,箍筋自径=2，下料长度=2b+2h200十203=2b+2h当帰护层bhc=25,箍筋宣径=12,当保护层bhc=25t箍筋貢径=创下料长度=2b+2h斗斗当保护层bhc=25,箍筋宜.径下料长度=肚+2h32当保护层bhc=251讎筋直径=10*下料长度=2b+2h-200+210=2b+2h+10当保护层bhc=25箍筋宜径=1玄下料长度=2b+2h+52
11G101新平法下箍筋下料长度计算
