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梁钢筋算量公式

1、梁上部纵筋长度=总净跨长+左锚固+右锚固+搭接长度×搭接个数

搭接长度:如为机械连接或焊接连接时,搭接长度为0
左(右)锚固长度:
当hc-保护层<Lae时,弯锚,锚固长度=支座宽-保护层+15d
当hc-保护层 ≥Lae时,直锚,锚固长度=max(Lae,0.5hc+5d)
保护层:是柱保护层

2、下部通长筋长度=净跨长+左锚固+右锚固+搭接长度×搭接个数

左(右)锚固长度:同梁上部钢筋(下部钢筋在中支座中的锚固能直锚的时候直锚)

3、上部端支座负筋:
第一排=1/3净跨长+左(右)锚固长度
第二排=1/4净跨长+左(右)锚固长度

左(右)锚固长度:同梁上部钢筋

4、上部中间支座负筋:
第一排=1/3净跨长×2(净跨长取相邻两跨最大值)+支座宽
第二排=1/4净跨长×2(净跨长取相邻两跨最大值)+支座宽

5、架立筋单长=净跨长-净跨长/3×2+150×2

6、箍筋
单长(2肢箍)=(长-2保护层+宽-2保护层)×2+2×max(10d,75)
根数
加密区根数=[(加密区长度-50)/加密区间距+1]×2

非加密区根数=(净跨长-2×加密区长度)/非加密区间距1
加密区长度:一级抗震:max(2hb,500)
      二级——四级抗震:max(1.5hb,500)

7、侧面纵向钢筋(腰筋)
构造筋长度(G打头的钢筋)=净跨长+2×15d
抗扭筋长度(N大头的钢筋)=净跨长+2×锚固长度

锚固长度同框架梁下部钢筋

8、拉筋:
当梁宽≤350时,拉筋直径为∅6(计算工程量时用∅6.5来计算)
当梁宽>350时,拉筋直径为∅8
拉筋单长=梁宽-2×保护层+2×max(10d,75)
拉筋根数=[(净跨长-50×2)/(非加密区间距×2)+1]×(腰筋根数/2)

9、附加吊筋
吊筋单根长度=次梁宽+2×50+2×(梁高-2保护层)/sin45°( sin60° )+2×20d

当主梁高≤800时,吊筋角度为45度;当主梁高>800时,吊筋角度为60度
备注:主次梁相交处,注意附件的箍筋

10、屋面框架梁
屋面梁上部通常筋=总净跨长+左锚固+右锚固+搭接长度×搭接个数

搭接长度:如为机械连接或焊接时,搭接长度为0
左(右)锚固长度=支座宽-柱保护层+梁高-柱保护层

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