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五、支座不在边缘的圆板 根据荷载的分布情况及支座的位置,板的破坏图形可能有四种。 第一种情形:如图7乙所示,在板的上部沿支座形成一道环形裂缝,并由此向外伸延一束放射向的裂缝,支座以外的圆板悬挑部分向下塌落。在这种情况下,应沿支座内外在板的上部配置钢筋网。 第二种情形:如果圆板外挑部分的荷载绕支座的力矩小于圆板中央部分的荷载绕支座的力矩,则可能如图7丙所示,在板的下面形成一束经过圆板中心的放射向裂缝,板的中央部分向下凸出,外
Fifth, the support is not on the edge of the circular plate According to the distribution of the load and the position of the support, the board may have four kinds of damage graphics. In the first case, as shown in FIG. 7B, an annular crack is formed along the support in the upper part of the plate, and a radially outwardly extending crack extends outwardly therefrom, and the cantilevered portion of the circular plate other than the support collapses downwardly. . In this case, reinforcement meshes should be placed along the upper and inner plates of the support. In the second case, if the moment of the load on the outer part of the circular plate around the support is less than the moment of load around the central part of the circular plate, a bunch of circular plates may form under the plate as shown in Fig. 7(c). The center’s radiation is facing the cracks. The center part of the board protrudes downwards.