当箍筋R=2.5d时,135o钢筋弯钩内皮差值=1.3572.5d+1.178d=4.571d
抗震箍筋135o/135o,弯钩末端直线长度为10d或75mm
箍筋中心线长=箍筋内皮周长+内皮90o差值3+135o内皮差值2+(10d或75)2
=(截面外周长-200)-0.287d3+4.571d2+(20d,150)
=(截面外周长-200)+8.28d+(20d,150)
近似长度=构件截面周长
筋:6Ф25底筋
单根长=Ln1+LaE+(hc-50+15d-2.93d)
=(6000-450)+3825+(450-50)+1525-2.9325
=5550+950+400+375-73.25
=7201.75(mm)
小计长=7.202m6=43.21m
① 筋:4Ф25底筋(短跨)
单根长=Ln2+LaE+(hc-50+15d-2.93d)
=(4000-450)+3825+(450-50)+1525-2.9325
=3550+950+400+375-73.25=5201.75(mm)
小计长=5.202m4=20.81m
② 筋:2Ф25通长筋
单根长=6000+4000-2252+(hc-50+15d-2.93d)2
=9550+(450-50+375-73.25)2
=10953.5mm
小计长=10.953m2=21.906m
③ 筋:2Ф22直角筋
单根长=1/3Ln1+(hc-50)+15d-2.931d
=1/35550+(450-50)+1522-2.93122
=1850+400+330-64.48
=2515.52mm
小计长=2.515m2=5.03m
④ 筋:2Ф25直角筋
单根长=1/3Ln2+(hc-50)+15d-2.931d
=1/33550+(450-50)+1525-2.93125
=1184+400+375-73.28
=1886mm
小计长=1.886m2=3.77m
⑤ 筋:中支座负筋2Ф25(下排)
单根长=1/4Ln12+hc
=1/455502+450
=13882+450
=3225mm
小计长=3.225m2=6.45m
⑦筋:中支座负筋2Ф25(上排)
单根长=1/3Ln12+hc
=1/355502+450
=18502+450
=4150mm
小计长=4.15m2=8.30m
⑧侧边构造筋G4Ф10:
小计长=(构件长-保护层2+弯钩增加长2)4
=(6000+4000+2252-252+6.25102)4
=10525mm4
=42.10m
⑨箍筋Ф8:
加密区根数=[(2650-50)100+1]4
=144=56
非加密区根数=[(5550-13002)200-1]+[(3550-13002200-1)
=(15-1)+(5-1)=18
小计长=[(300+650)2+26](56+18)
=192674=142524mm=142.52m
钢筋重量:
Ф25:0.006165252(43.21+20.81+21.91+3.77+6.45+8.30)
=3.85104.45=402.13kg
Ф22:0.0061652225.03=2.985.03=14.99kg
Ф10:0.00616510242.10=0.616542.10=25.95kg
Ф8:0.00616582142.52=0.395142.52=56.23kg
合计=499.30kg