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58问答库 > 某矩形钢筋混凝土梁，截面尺寸bXh=250mmX500mm.混凝土C20，钢筋HRB335级在梁

某矩形钢筋混凝土梁，截面尺寸bXh=250mmX500mm.混凝土C20，钢筋HRB335级在梁

2025-03-16 00:04:04

推荐回答（1个）

回答（1）：

底筋6Φ22，则为两排，采用as=60mm. 截面有效高度ho=440mm ;
HRB335钢筋实际截面积2281mm²，抗拉强度设计值fy=300N/mm²; 混凝土C20，抗压强度设计值fc=9.6N/mm²。
按GB50010-2010规范计算，知正截面弯矩最大设计值为211.5KN·m＞200KN·m.
梁的正截面承载力安全可靠。

应指出的是配筋率已超出2.0%. 宜增高截面为550为好。特此说明。

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