高预应力度预应力混凝土框架抗震性能试验研究

Experimental study on prestressed concrete frame structures with high partial prestressing ratio

现行规范为满足预应力混凝土结构的抗震性能要求,设置了预应力度限值。该限值的过严规定,导致普通钢筋的配筋量增加,易造成节点区钢筋密集,施工及质量控制难度增加,且经济性降低。本文为研究高预应力度预应力混凝土结构的抗震性能,进行了两榀高预应力度预应力混凝土框架的拟静力试验。试验研究结果表明,预应力度对预应力混凝土结构的抗震性能影响较小,高预应力度预应力混凝土框架仍显示出良好的抗震性能。

In order to satisfy the seismic performance of prestressed concrete structures, the partial prestressing ratio is set up in Code for Design of Concrete. The code is so stringent that the amount of rebar is increased a lot, which is uneconomical and high density of reinforcing steel in joint area. Accordingly, it is difficult to control quality of construction. Two partially prestressed concrete frames with the partial prestressing ratio are tested under static cyclic loads to study the seismic performance. As a result, the prestressed concrete frame structures with high partial prestressing ratio exhibit good seismic performance, and it is indicated that partial prestressing ratio has little effect on the seismic performance of partially prestressed concrete frame structures.