论文部分内容阅读
工程中常采用填芯,掺加钢纤维以及配置非预应力筋等方式来增强预应力混凝土管桩的抗弯承载力,但是这些改进后的管桩在地震荷载作用下的受力性能还不明确。通过三组试件的低周往复加载试验,分别从滞回耗能延性和承载力等几个方面研究预应力混凝土管桩(PHC管桩)、预应力钢纤维高强混凝土管桩(SFPHC管桩)、添加普通钢筋的预应力高强混凝土管桩(PRC管桩)的抗震性能以及填芯对管桩抗震性能的影响。试验结果表明:添加普通钢筋能够很好地改善PHC管桩的抗震性能。填芯能够提高PHC和SFPHC管桩在往复荷载作用下的承载力并能增强PRC管桩的耗能能力。各类填芯管桩的延性相对于未填芯管桩均有明显的改善。
In engineering, core-filling, steel fiber addition and non-prestressed tendons are often used to enhance the flexural capacity of prestressed concrete pipe piles. However, the performance of these improved pipe piles under earthquake load is not clear . Through the low-cycle reciprocating loading tests of three groups of specimens, the effects of prestressed concrete fiber reinforced plastic pipe pile (PHC pipe pile), prestressed steel fiber reinforced high strength concrete pipe pile (SFPHC pipe pile ), The seismic behavior of prestressed high-strength concrete pipe pile (PRC pipe pile) with ordinary steel reinforcement and the effect of core filling on the seismic performance of pipe pile. The test results show that adding ordinary steel can well improve the seismic performance of PHC pipe piles. Core filling can improve the bearing capacity of PHC and SFPHC pipe piles under reciprocating loads and enhance the energy dissipation capacity of PRC pipe piles. The ductility of various types of filled tubular piles is obviously improved compared with that of unfilled tubular piles.