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钢筋混凝土梁施工中,有时因缺乏大直径钢筋需用较小直径钢筋代换。用小直径钢筋代换大直径钢筋,往往会出现因钢筋根数的增加使原设计为一层的布置需要改为两层布置的情况。那么,当钢筋由一层改为两层布置时应注意什么问题呢?从梁的钢筋构造可知,当纵向受拉钢筋由一层改为两层布置时,由于梁的截面有效高度减小,因此,应按《混凝土结构设计规范》(GBJ 10-89)复核梁的受弯和受剪承载力。
Reinforced concrete beam construction, sometimes due to the lack of large-diameter steel rebar need to use a smaller diameter. Replacement of large diameter steel bars with small diameter tend to appear due to the increase in the number of steel roots so that the original layout of the layout needs to be changed to two layers of layout. So, what should be paid attention to when the reinforcement is changed from one floor to two floors? From the reinforcement structure of the beam, when the longitudinal tensile reinforcement is changed from one to two, the effective height of the beam decreases, Therefore, the bending and shear capacity of beams should be checked according to “Code for Design of Concrete Structures” (GBJ 10-89).