摘要
预应力高强混凝土(PHC)管桩虽具有高竖向抗压承载力,但在高铁桥梁应用场景中,常承受高铁高速运行、水平地震波和风荷载所致水平荷载作用,故需要有良好的抗弯性能。基于此,借助ABAQUS有限元软件对PHC管桩抗弯性能进行了数值模拟,并分析了不同荷载、约束形式、纵筋配筋率、箍筋配筋率和预应力施加对PHC管桩抗弯性能的影响。研究结果表明:在简支约束下,随着跨中荷载的递增,管桩跨中上表面混凝土受压、下表面钢筋受拉的受力分布格局基本恒定,但桩身与钢筋最大应力增加;变更约束为上下固定约束时,PHC管桩桩身应力减小,跨中截面钢筋应力增大;提高纵筋配筋率可显著增强桩身刚度与延性;适度降低箍筋配筋率对PHC管桩抗弯性能影响甚微;预应力施加可显著改善PHC管桩承载力与抗弯性能。该研究成果可为PHC管桩工程应用的设计与施工提供参考。
Prestressed high-strength concrete(PHC)pipe piles have high vertical compressive bearing capacity.However,high-speed railway bridges are often subjected to high-speed trains,horizontal seismic waves,and wind loads so that good flexural performance is required.Based on this,the ABAQUS finite element software was utilized to conduct numerical simulations of the flexural performance of PHC pipe piles.The effects of different loads,restraint forms,longitudinal reinforcement ratios,stirrup reinforcement ratios,and prestress application on the flexural performance of PHC pipe piles were analyzed.The research results indicate that under simply-supported constraints,as the mid-span load increases,the stress distribution pattern,where the concrete on the upper surface of the pipe pile at the mid-span is under compression and the steel bars on the lower surface are in tension,remains basically constant.But the maximum stresses of the pile body and the steel bars increase;When the restraint is changed to upper and lower fixed constraints,the stress of the pile body of the PHC pipe pile decreases,while the stress of the steel bars in the mid-span section increases;Increasing the longitudinal reinforcement ratio can significantly enhance the stiffness and ductility of the pile body;Moderately reducing the stirrup reinforcement ratio has little effect on the flexural performance of PHC pipe piles;The application of prestress can obviously improve the bearing capacity and flexural performance of PHC pipe piles.The research findings can provide reference for the design and construction of PHC pipe pile engineering applications.
作者
李明宇
刘明帝
甑尚维
万志辉
郭严伟
张宝盆
Li Mingyu;Liu Mingdi;Zeng Shangwei;Wan Zhihui;Guo Yanwei;Zhang Baopen(The Second Engineering Co.,Ltd.of China Railway Seven Group,Shenyang 110005,China;School of Transportation Engineering,Nanjing Tech University,Nanjing 211816,China)
出处
《市政技术》
2025年第3期183-191,共9页
Journal of Municipal Technology
基金
中国博士后科学基金面上项目(2022M723534)
江苏省高等学校基础科学(自然科学)研究重大项目(23KJA560005)。
关键词
PHC
管桩
抗弯性能
静载试验
有限元分析
本构模型
PHC
pipe piles
flexural performance
static load test
finite element analysis
constitutive model
