圆形截面正截面受弯承载力计算

从规范正截面承载力设计的基本假定出发,首先得出了使在一定圆心角范围内所配置的受拉钢筋均能达到屈服的混凝土界限受压区高度所对应的圆心角（文中称为界限受压圆心角）的计算公式,然后得出了仅在一定圆心角范围内均匀配置受拉钢筋的圆形截面正截面受弯承载力设计计算公式,并给出了进行设计计算的相关表格.经试算表明,文中方法的计算结果即为精确结果,而且运算简单快捷,经与现行规范配筋结果比较,能显著节约工程造价.

Calculation on Flexural Capacity of Normal Section of the Circular Section

From the elementary assumption to design the flexural capacity of normal section in the code,firstly,we find out the computing formula which can be used to calculate the central angle corresponding to critical height of concrete in compression(called" limit central angle in compression"in the paper)in the case of that tension steel is yielded when reinforcement is in certain central angle.Then, we find out the computing formula to design the flexural capacity of normal section of the circular section,and provide the correlative table when progress the calculation for the design.The trial-calculation shows that the result of this method is accurate,moreover,it is simple and convenient in operation.Compared with present code,the proposed method can save the cost of the project obviously.