建筑结构学报2025，Vol.46Issue(9)：289-302,14.DOI:10.14006/j.jzjgxb.2024.0656
区段配筋预应力高强混凝土支护桩受弯性能与内置非预应力筋锚固长度研究
Study on flexural performance of sectionally reinforced prestressed high-strength concrete pipe piles and anchorage length of embedded non-prestressed reinforcement
摘要
Abstract
Sectional composite reinforced prestressed concrete pipe piles(PR-PHC pipe piles)improve the steel bar utilization efficiency of foundation pit support piles by configuring non-prestressed steel bars in prestressed concrete pipe piles(PHC pipe piles).To investigate the bending deformation capacity of PR-PHC piles,the stress distribution of reinforcement,and the anchorage length of non-prestressed reinforcement,full-scale bending tests and numerical simulations were conducted on 14 PR-PHC piles with different reinforcement lengths LαMu(corresponding maximum bending moment reduction coefficients α of 0,0.5,0.6,0.7,and 0.8).The results show that the configuration of non-prestressed steel bars in the section can enhance the pile's capacity to resist bending deformation after cracking,and this capacity increases with the expansion of the reinforced section.When non-prestressed reinforcement is sectionally configured within the range from the section with the maximum bending moment to the section where the bending moment reduces to 50％of the maximum bending moment,the bending deformation capacity of PR-PHC pipe piles is consistent with that of full-length mixed reinforced prestressed concrete pipe pile(PRC pipe pile)specimens.The larger the reinforcement range of the section is,the better the flexural bearing capacity of the prestressed and non-prestressed tendons located in the tension zone can be exerted.The non-prestressed tendons in the anchoring section of the pile body will accelerate the development of cracks in the pile body.To ensure that the tensile stress in the bars can be fully transferred to the pile body,sufficient anchorage length should be provided.The study indicates that an anchorage length of 35 times the diameter of non-prestressed bars is sufficient to ensure force transmission.关键词
预应力高强混凝土管桩/配筋长度/弯曲试验/数值模拟/受弯承载力/锚固长度Key words
prestressed high-strength concrete pipe pile/reinforcement length/bending test/numerical simulation/flexural capacity/anchorage length分类
建筑与水利引用本文复制引用
刘永超,董浩然,江红,李兵兵,刘岩,张阳..区段配筋预应力高强混凝土支护桩受弯性能与内置非预应力筋锚固长度研究[J].建筑结构学报,2025,46(9):289-302,14.基金项目
国家自然科学基金项目(52078335). （52078335）
