不同预应力筋布筋型式双向板的受力性能及承载力计算

STUDY ON THE BEHAVIOR AND BEARING CAPACITY OF TWO?WAY SLABS WITH DIFFERENT TENDON LAYOUTS

预应力混凝土双向板已广泛应用于工程建设 ,迄今为止 ,工程中的双向板大量采用的预应力筋布筋型式是双向均匀布置 ,关于预应力筋布筋型式对四边简支双向板受力性能及承载力影响的研究还未见报道。因此 ,本文着重对板中央承受局部荷载的双向均匀布置预应力筋、双向中密边稀布置预应力筋、双向中间密布预应力筋的三块双向板的受力性能进行了试验研究 ,并采用塑性铰线理论对三块试验板的承载力进行了分析和计算。试验研究和计算分析表明 ,双向中间密布预应力筋试验板的承载力最高 ,双向中密边稀布置预应力筋试验板的承载力次之 ,双向均匀布置预应力筋试验板的承载力最低 ,塑性铰线理论可应用于四边支承预应力双向板的承载力计算。

The behavior and bearing capacity of two-way prestressed concrete slabs are studied in the paper It is not find any reports about the tendon layouts yet Three pieces of two-way slabs with different tendon layouts are tested in the laboratory The sample slabs are calculated by the yield line theory It is found that the slab disposited tendons densely in the midst of slab has the highest bearing capacity;the slab with uniformly layout has lowest bearing capacity Some useful conclusions are obtained from the study It is evident that the yield line theory can be used to calculate the bearing capacity