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钢筋加密区

1、柱箍筋加密范围:

底层柱(底层柱的柱根系指地下室的顶面或无地下室情况的基础顶面)的柱根加密区长度应取不小于该层柱净高的1/3,以后的加密区范围是按柱长边尺寸(圆柱的直径)、楼层柱净高的1/6,及500mm三者数值中的最大者为加密范围。

2、梁箍筋加密范围:

加密范围从柱边开始,一级抗震等级的框架梁箍筋加密长度为2倍的梁高, 
加密位置从柱边5cm开始。 二、三、四级抗震等级的框架梁箍筋加密长度为1.5倍的梁高,而且加密区间总长均要满足大于500mm,如果不满足大于500mm,按500mm长度进行加密,加密位置从柱边5cm开始。

根据《混凝土结构设计规范》的要求,梁端箍筋的加密区长度、箍筋最大间距箍筋最小直径,应符合下述规定:1、对抗震等级一级,加密区长度为2h和500中较大值,最大间距为纵向钢筋直径的6倍、梁高1/4和100中的最小值,箍筋最小直径10;2、二级:1.5h和500中较大值,纵向钢筋直径的8倍、梁高1/4和100中最小值,最小直径83、三级:1.5h和500中较大值,纵向钢筋直径的8倍、梁高1/4和150中最小值,最小直径84、四级:1.5h和500中较大值,纵向钢筋直径的8倍、梁高1/4和150中最小值,最小直径6 

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