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1.第一种情形:与前节圆板的第一种破坏情形完全一样(图7乙)。所以板的强度公式与(5-7)及(5-15)完全相同,在均布荷载作用下的强度公式也与(5-42)式完全一样,不再赘述。 2.第二种情形:与前节圆板的第二种破坏情形相似。如果环形板外挑部分绕支座的外力矩小于其中央部分绕支座的外力矩,则将在板的下部出现一束放射向的裂缝,板的外挑部分向上翘起,中央部分向下垂落而破坏。假定只在支座以内的中央部分配有下部钢筋
1. The first case: exactly the same as the first case of destruction of the former circular plate (Fig. 7B). Therefore, the strength formula of the board is exactly the same as (5-7) and (5-15), and the strength formula under the uniform load is exactly the same as (5-42), and is not repeated here. 2. The second case: similar to the second case of destruction of the former circular plate. If the outer moment of the outer part of the annular plate around the support is smaller than the outer moment of the central part around the support, a beam of radial cracks will appear in the lower part of the plate, the outer part of the plate will be upwards and the central part will be downward. Drop and damage. Assume that only the central part of the support is equipped with lower reinforcement