(1 广东省建科建筑设计院有限公司, 广州 510010; 2 广东工业大学土木与交通工程学院,广州 510006; 3 墨尔本大学基础设施工程学院, 帕克维尔维多利亚 VIC 3010)

摘要: 为研究水平荷载作用下预应力高强混凝土管桩的动力响应和破坏模式,采用超高落锤冲击试验装置对 4根预应力高强混凝土管桩(PHC 管桩)进行冲击试验并使用 ABAQUS 进行数值模拟,测得不同冲击高度下落锤的冲击速度、冲击力时程曲线及试件冲击区侧面处位移时程曲线,并获取试件的破坏形态。 结果表明:该模型能较好地模拟 PHC 管桩动力响应及破坏形态。 基于该模型的可靠性,在 PHC 管桩内填充 C30 混凝土并配置钢筋进行冲击模拟。 研究表明:PHC 管桩在低速冲击作用下具有较好的弹性恢复能力;当 PHC 管桩局部受到 2 次大于 15km/ h的冲击荷载时,将在冲击区发生局部冲切破坏;当 PHC 管桩受到 2 次累计冲击荷载时,第 2 次撞击较首次抗冲击性能减弱;灌芯后的 PHC 管桩抗冲击性能较 PHC 管桩增强。

关键词: 预应力高强混凝土管桩; 抗冲击性能; 动力响应; 弹性恢复能力; 冲击力时程曲线

中图分类号:TU560 文献标志码:A 文章编号:1002-848X(2022)24-0114-06

DOI:10. 19701 / j. jzjg. LS210278

Research on performance of prestressed high-strength concrete pipe piles under lateral impacts

KUANG Mengfang1,2, XU Caiwei1,3, XU Qigong1,2, CAO Huaxian2, YANG Xueqiang2, DONG Pengcheng2

(1 Guangdong Jianke Architectural Design Institute Co. , Ltd. , Guangzhou 510010, China; 2 College of CivilEngineering and Transportation, Guangdong University of Technology, Guangzhou 510006, China; 3 Department ofInfrastructure Engineering, University of Melbourne, Parkville Victoria VIC 3010, Australia)

Abstract: In order to study the dynamic response and failure mode of prestressed high-strength concrete pipe piles underhorizontal load, four prestressed high-strength concrete pipe piles (PHC pipe piles) were tested experimentally by a superhigh drop hammer impact testing device and simulated numerically by ABAQUS. The impact velocity, impact force-timecurve and displacement-time curve at the side of the impact area of the specimen were measured for different impact heightsof the falling hammer, and the damage pattern of the specimen was obtained. The results show that the model can simulatethe dynamic response and failure mode of PHC pipe piles approximately. Based on the reliability of the model, a PHC pipepile filled with concrete with a grade of compressive strength of C30 and reinforced with steel bars for impact simulation.The results show that PHC pipe piles can recover to the elastic stage after impacted by a low speed; when PHC pipe pilesare locally impacted by a speed more than 15km/ h twice, local punching failure occurs in the impacted area; when PHCpipe piles are subjected to cumulative impact loads twice, the impact capacity of the second impact is lower than that of thefirst impact; the impact capacity of the PHC pipe pile after grouting is higher than that of the PHC pipe pile.

Keywords:prestressed high-strength concrete pipe pile; impact resistance; dynamic response; resilient recovery capacity;impact force-time curve

第一作者:邝梦芳,硕士,主要从事装配式研究,Email:403689249@ qq. com。

[引用本文] 邝梦芳,徐采薇,徐其功,等. 预应力高强混凝土管桩抗侧向冲击性能研究[ J]. 建筑结构,2022,52(24):114-119, 130. KUANG Mengfang,XU Caiwei,XU Qigong, et al. Research on performance of prestressed highstrength concrete pipe piles under lateral impacts[J]. Building Structure,2022,52(24):114-119,130.