混合配筋超高强混凝土管桩抗弯性能试验研究

Experimental Study on Flexural Performance of Ultra-high Strength Concrete PRC Pipe Pile

为研究C105级超高强混凝土对预应力混凝土管桩受力性能的影响,对设计制作的7根混合配筋预应力混凝土管桩(PRC管桩)和1根预应力混凝土管桩(PHC管桩)进行了抗弯性能试验,分析超高强混凝土(C105)和非预应力钢筋配置等对PRC管桩受弯性能的影响。试验结果表明:超高强混凝土PRC管桩和PHC管桩均呈现为受弯破坏;PRC管桩抗弯承载力较PHC管桩有明显提高,且随非预应力钢筋配筋率的提高而增大,提高幅度约为32%;非预应力钢筋的配置对开裂弯矩影响不大,但使PRC管桩的裂缝分布范围更广(平均裂缝间距约减小18%),变形更加充分,延性得以提高。

In order to analyze the influence of ultra-high strength concrete(C105) on the mechanical properties of prestressed concrete pipe piles, seven prestressed concrete pipe piles with non-prestressed reinforcement(PRC pipe piles) and one prestressed concrete pipe pile(PHC pipe pile) were designed and manufactured. The flexural performance experiments were carried out to analyze the influence of ultra-high strength concrete(C105) and unpressurised reinforcement configuration on the pipe pile. The test results show that both of them show bending failure. The flexural capacity of PRC pipe piles is obviously higher than that of PHC pipe piles, and increases with the increase of non-prestressed reinforcement ratio, with an increase of about 32%. The configuration of non-prestressed reinforcement has little effect on the cracking moment, but it makes the crack distribution of PRC pipe piles wider(average crack spacing is reduced by about 18%), deformation more sufficient and ductility improved.