11G101新平法下箍筋下料長度計(jì)算

1、下料長度=2b+2h-8bhc-4(D+2)d+(D+1)d*3.14*(3*90+2+125)/360+20d計(jì)算思路：中心線計(jì)算，保護(hù)層厚個(gè)135度彎弧長+2個(gè)彎鉤直段長4邊直段+3個(gè)90度彎弧長+2牌號(hào)保護(hù)層厚bhc直徑D箍筋直徑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級(jí)59521522混凝土結(jié)構(gòu)工程施工規(guī)范GB506666-2011反乳5條2款光圓鋼筋的彎弧內(nèi)直徑不應(yīng)小于鋼筋直徑的2.5倍；所以，HPB300級(jí)光面鋼筋箍筋展開長度=2b+2h-8bhc+20d-4*4.5d+3占加3.1415927*I.阱90+訓(xùn)135./360=2b+2h-8bhc+-2d-Fl6.5d=2b+2h-8bhc+185d（外皮此處+2乩2d）當(dāng)保護(hù)層bhc-=：5,箍筋宣徑=已丕赴晝虞=b+2h59當(dāng)保護(hù)層bho/=2：5f箍筋直徑=8,下料長度=

3、2b+2h-52當(dāng)保護(hù)層bhc=25箍筋直徑=10：j下料長度=2b+2h-200+1852b+2h15當(dāng)保護(hù)層=齬盤直徑=12,下栄斗長度=2b+2h十率.-vcjrq335MR&級(jí)400MP1I級(jí)I5db7d2bhchh(;中注)E3f丄盤生ittl4-kifif甜TC0umu_mmb-8d-2bhc/rAMr-caAZw*循助鋼助=rf-5JjMPa級(jí)混凝土結(jié)構(gòu)工程施工規(guī)范GB506666-20115一乩5察4款SOOMP級(jí)帶肋鋼筋的彎弧內(nèi)直徑不應(yīng)小于鋼筋直徑的6倍所以，500MPa級(jí)帯肋鋼筋蠱筋嚴(yán)開長度二2b+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啟q7IPCOI丄bhc善$5d3鉀b-7d-2bhc1匚48370044d4db-8cMbhcb44321052推丫混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范GB500120104.2.條弱款混凝土結(jié)拘工錚擴(kuò)工規(guī)韻GB506666-20115.3.53款335MPa級(jí)400MBa級(jí)帶肋鋼筋的彎弧內(nèi)直徑不應(yīng)小于鋼筋直徑的倍；所以，335MPa蘇400MPn級(jí)帶肋箍筋無開長度=2b+2h-8bhc+2Od-47d+6d*3.1415927（針90+2學(xué)13前/36Q=2b+2h-8bhc-8d+28.3d=2b+2h-8bhc+20,3d（外皮此處+25d）當(dāng)保護(hù)層bhc=25,箍筋直徑=釘下料長度=2b+2h48當(dāng)保護(hù)層bhc=25.箍筋直徑=&下科長度2b+2h前當(dāng)保護(hù)層bhc=25,箍筋自徑=2，下料長度=2b+2h200十203=2b+2h當(dāng)帰護(hù)層bhc=25,箍筋宣徑=12,當(dāng)保護(hù)層bhc=25t箍筋貢徑=創(chuàng)下料長度=2b+2h斗斗當(dāng)保護(hù)層bhc=25,箍筋宜.徑下料長度=肚+2h32當(dāng)保護(hù)