PHC管桩耗能能力改善措施的试验研究

Experimental Study on Improvements of Energy-dissipating Capacity of Prestressed High Strength Concrete Piles(PHC)

为提高预应力高强混凝土管桩的耗能能力,分别采取了在管桩桩身中掺入了不同量的钢纤维、填芯和加配非预应力筋的改进方法。通过施加低周反复荷载来模拟地震作用下管桩的受力变形情况,并对比了各种改进方法对耗能能力的影响。试验结果表明,掺入钢纤维、填芯和加配非预应力筋使得管桩的裂缝发展和破坏形态均得到改善,且承载能力均有提高,其中填芯和配置非预应力筋对管桩承载能力提高最大,并且耗能能力随着掺入钢纤维量的增加而提高,而加配非预应力筋和掺入钢纤维的同时填芯对提高管桩耗能能力的影响最为显著。

In order to improve the energy-dissipating capacity of the prestressed high strength concrete piles, the concrete piles are changed by adding different amounts of steel fiber, pile core and non-prestressed steel bars. The specimens are tested by the low cyclic loading tests, through which to imitate the fore and the morph caused by the earthquake, so as to compare the different influence on the energy-dissipating capacity of the piles. The results show that：the crack and damage characteristic and the bearing capacity of all the piles are improved and the pile core and the nonprestressed steel bars are the most important role in the bearing capacity improvement. The energy-dissipating capacity improves with the increasing of amount of the steel fiber and it can improve the energy-dissipating capacity of piles most observably by adding non-prestressed steel bars and combining the steel fiber and the pile core.