吴邦达     （中国兵器工业第五设计研究院  北京 100053）

[提要]  混凝土结构设计规范( GBJ10-89)关于钢筋混凝土双向受弯正截面承载力的近似计算，仅适用于集中配置纵向受拉钢筋的截面，使用范围易受到限制。采用极限平衡理论计算强度和平截面假定限制受压区，提出了另一近似法，可用于分散及集中配筋。算例表明，该方法具有较高的精度。
[关键词]  钢筋混凝土  双向受弯  分散配筋  受压区  性能  限制条件

In code GBJ10-89, the approximate calculation for normal sectional load bearing capacity of reinforced concrete members subjected to biaxial bending is limited to set concentrated longitudinal reinforcements. The range of application is smaller. Another approximate calculation method obtained by calculating strength with equilibrium theory of ultimate strength and restricting compression area of concrete with plane-section assume may be used to set dispersed and concentred longitudinal reinforcements, and its accuracy is higher.
Keywords:  biaxial bending; dispersed reinforcements; restrictive condition; compression area; concrete