开洞位置对无粘结预应力板挠度影响的实验分析

Unbonded Prestressed Slab Experimental Analysis of Deflection Impact in Position Openings

无粘结预应力混凝土楼面经常要进行开洞处理,洞口附近区域易产生应力集中现象,对楼板的整体性能有很大影响,会导致楼板的裂缝开展,挠度增大,抗弯承载能力急剧下降等。文章通过4块无粘结预应力混凝土开洞板的实验现象,着重对不同开洞位置无粘结预应力板的挠度情况进行研究分析。结果表明,楼板开洞对板造成的影响是复杂的,与洞口的位置、形状、周边的受力、楼板的受力、楼板的性质(单向板、双向板、连续板)等都密切相关。

Hole drilling is usually encountered in the floor of prestressed concrete structures,in the nearby area of the slabs opening hole which is easy to produce the phenomenon of stress concentration on the floor,has great influence on the overall performance.It will result in the bending slab sharp decline in carrying capacity,easy to causing floor damage and so on.In this paper,four of unbonded prestressed concrete slab of experiment,with emphasis on the different opening position that unbonded prestressing of conducting studies on analysis of deflection,trying to summarizing its characteristics and the commonality of approach.The results show that the impacts of drilling holes in the floor are complex,which are closely related with the location,shape,force of the hole and with the force,nature of the floor（one-way board,two-way slabs,continuous plate）.