一、问题提出所谓大面积整体楼面是指某些中高低建筑物中的某一层楼上设置的,具有一次性可变荷载又较大的楼面。调查发现,很多楼面在上述使用荷载下,由于设计不当使预制钢筋混凝土空心板作为楼面承重的,普遍都存在沿空心板支座处通长或不通长的裂缝出现,这种裂缝在施工阶段荷载作用下不会出现,而在使用一个阶段后,裂缝就会随着楼面使用及可变荷载大小的 First, the problem proposed that the so-called large area of ​​the overall floor refers to some of the middle and lower floors of a building set up, with a one-time variable load and a larger floor. The survey found that many of the floors above the use of the above load, due to improper design so that the prefabricated reinforced concrete hollow slab as a load bearing floor, generally there is a long or not long cracks along the hollow plate support, this crack in the construction The stage load will not appear, but after using a stage, the crack will be used with the floor and the size of the variable load.