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上期我们谈了钢筋混凝土板计算的一般内容,在介绍单向板和双向板时,我们只从它的主要特征——板受力后沿一个方向或两个方向弯曲来区分,其实这还不够。假如有一块板(图1),四边都有支承,但长度l很长,宽度B很短,板受力后虽然沿长宽两个方向都产生弯矩,能把荷重传到四边支座上去。但因宽度短,沿宽度方向产生的弯矩比沿长度方向产生的要大得多,大部份荷重传到沿宽度方向两端的支座AB、CD上去,而传到沿长度方向两端支座AD、BC上却很少。因此这块板虽有四边支承,但长宽比l/B
In the last issue, we talked about the general content of the calculation of reinforced concrete slabs. When we introduced unidirectional slabs and two-way slabs, we only distinguished from its main feature—the direction in which the slab was bent in one or two directions after being subjected to force. This is actually not enough. . If there is a board (Fig. 1) with support on all four sides, but the length l is very long and the width B is short. After the board is subjected to force, bending moments are generated along both length and width, and the load can be transmitted to the four-sided support. . However, due to the short width, the bending moment generated along the width direction is much larger than that generated along the length direction. Most of the load is transmitted to the supports AB and CD at both ends in the width direction, and is transmitted to both ends in the length direction. Block AD, BC is very small. Therefore, although this board has four sides of support, the aspect ratio l/B