预应力混凝土实心方桩抗弯性能试验研究

Experimental Study on Flexural Performance of Prestressed Concrete Solid Square Piles

结合足尺抗弯性能试验,对比研究了高低预应力混凝土实心方桩在抗裂性能、抗弯承载力、变形能力、破坏形式等方面的差异。结果表明:减小张拉控制应力可以降低预应力混凝土实心方桩的抗裂性能,提高变形能力,而桩身极限抗弯承载力基本保持不变;低预应力混凝土实心方桩破坏形式为预应力钢棒被拉断,高预应力混凝土实心方桩破坏形式为预应力钢棒被拉断或受压区混凝土被压碎。

Combined with the full-size flexural performance tests on the high prestressed concrete solid square piles and low prestressed concrete solid square piles,the differences in crack-resistance performance,flexural bearing capacity,deformation capacity and failure mode were comparatively studied.The results show that decreasing the tension control stress reduces cracking behavior of high prestressed concrete solid square piles,and improves deformation capacity,while the ultimate flexural bearing capacity of the piles remain basically unchanged.The failure mode of the low prestressed concrete solid square piles is that the prestressed steel bars is pulled off,and the failure mode of the high prestressed concrete solid square piles is that the prestressed steel bars is pulled off or the concrete in the compression zone is crushed.