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预应力混凝土空心板在民用建筑中应用极为广泛 ,由于在生产过程中 ,受原材料质量、工艺条件 ,养护及外界气温变化等因素影响 ,常常在板的上表面出现横向裂缝 ,其出裂频率由高到低依次是 :跨度为 4.2 m、3.9m、3.6 m、3.3m,大多发生在炎热干燥季节 ,出裂部位在板中部的 1/ 3范围
Prestressed concrete hollow slab is widely used in civil construction. Due to the influence of raw material quality, process conditions, maintenance and outside temperature changes, the transverse cracks often occur on the upper surface of the slab in the production process. The frequency of cracking is determined by The descending order is: span of 4.2 m, 3.9m, 3.6m, 3.3m, mostly in the hot and dry season, the rupture site in the middle of the plate 1/3 range