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为了验证采用新型连接方式的增强型预应力混凝土离心桩在滨海环境中长期工作的耐久性能,对增强型预应力混凝土离心桩与先张法预应力混凝土管桩进行加速劣化试验,并对劣化后的管桩进行抗拉试验。结果表明:在相同的腐蚀环境和腐蚀时间下,钢筋锈蚀引起锈胀裂缝,两种管桩的抗拉开裂荷载有明显的降低,先张法预应力混凝土管桩的抗拉承载力下降30%~53%,增强型预应力混凝土离心桩的抗拉承载力下降0%~6%;先张法预应力混凝土管桩的破坏形态为端头连接接缝破坏,而增强型预应力混凝土离心桩的破坏形态表现为桩身拉断破坏。增强型预应力混凝土离心桩比先张法预应力混凝土管桩具有更好的耐久性。
In order to verify the long-term durability performance of the reinforced prestressed concrete centrifugal pile in the coastal environment using the new connection method, the accelerated prestressed concrete centrifugal pile and the pretensioned prestressed concrete pipe pile are subject to accelerated deterioration test, and after the deterioration Of the pipe pile tensile test. The results show that under the same corrosive environment and corrosion time, corroded steel bars cause corrosion cracks and the tensile and tear loads of the two kinds of pipe piles decrease obviously. The tensile load capacity of the pretensioned prestressed concrete pipe piles decreases by 30% ~ 53%, the tensile bearing capacity of reinforced prestressed concrete centrifugal pile decreased by 0% ~ 6%; the failure mode of prestressed prestressed concrete pipe piles was the failure of the end connection joints, while the reinforced prestressed concrete centrifugal pile The destruction of the form manifested as the pile pulled off damage. The reinforced prestressed concrete centrifugal pile has better durability than the pre-tensioned prestressed concrete pipe pile.