分析地下车库无梁楼盖中集水坑设计

Analysis on the Sump Design in the Beamless Floor of Underground Garage

无梁楼盖上设置的集水坑该如何考虑,规范中没有明确。论文采用壳单元模拟楼板及柱帽,对集水坑在模型内输入、不输入及不考虑集水坑进行了建模计算比较。分析结果表明,考虑集水坑作用后,楼盖的弯矩分布情况接近于未设集水坑的普通无梁楼盖,不同于直接按开洞考虑。集水坑作为楼盖结构的一部分,是可以传递内力的,因此,集水坑的配筋应按折板构造,所有相关钢筋(包括附加筋)均应向下弯折。

It is not clear in the specification how to consider the sump on the beamless floor. In this paper, the shell element is used to simulate the floor slab and column cap, and the comparison of modeling calculation of sump in the model with or without input and without consideration of sump is made. The analysis results show that the moment distribution of the floor is close to that of the ordinary beamless floor without sump,which is different from that of the opening. As a part of floor structure, sump can transfer internal force. Therefore, the reinforcement of sump shall be constructed as folded plate, and all relevant reinforcement(including additional reinforcement) shall be bent downward.