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刘永超, 刘岩, 李兵兵, 张国平, 胡智鑫, 刘建志. 基于基坑支护工程的区段复式配筋预应力管桩抗弯试验及数值模拟[J]. 岩土工程学报, 2024, 46(2): 406-414. DOI: 10.11779/CJGE20221359
引用本文: 刘永超, 刘岩, 李兵兵, 张国平, 胡智鑫, 刘建志. 基于基坑支护工程的区段复式配筋预应力管桩抗弯试验及数值模拟[J]. 岩土工程学报, 2024, 46(2): 406-414. DOI: 10.11779/CJGE20221359
LIU Yongchao, LIU Yan, LI Bingbing, ZHANG Guoping, HU Zhixin, LIU Jianzhi. Flexural tests and numerical simulations of prestressed concrete pipe piles with partial hybrid reinforcement based on support of foundation pits[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(2): 406-414. DOI: 10.11779/CJGE20221359
Citation: LIU Yongchao, LIU Yan, LI Bingbing, ZHANG Guoping, HU Zhixin, LIU Jianzhi. Flexural tests and numerical simulations of prestressed concrete pipe piles with partial hybrid reinforcement based on support of foundation pits[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(2): 406-414. DOI: 10.11779/CJGE20221359

基于基坑支护工程的区段复式配筋预应力管桩抗弯试验及数值模拟

Flexural tests and numerical simulations of prestressed concrete pipe piles with partial hybrid reinforcement based on support of foundation pits

  • 摘要: 复式配筋预应力混凝土管桩(PRC管桩)作为基坑支护桩使用时,为提高非预应力钢筋的利用效率,提出将区段配置非预应力钢筋的管桩作为基坑支护桩。通过对天津地区80个基坑工程中的支护桩弯矩分布情况统计分析,并对区段复式配筋预应力混凝土管桩(PR-PHC管桩)进行足尺抗弯试验及有限元分析,研究区段配筋的可行性和PR-PHC管桩的抗弯性能。研究表明,单支撑排桩、倾斜桩及悬臂桩的桩身弯矩区间分布具有规律性。PR-PHC管桩区段配置的非预应力筋,可以提高其抗弯极限承载力及其抗弯刚度,并有效改善桩身裂缝的展开情况,构建的数值模型可以较好地反映试验的实际情况。并对PR-PHC管桩在实际应用中可能遇到的不利工况做了影响分析。研究结果表明可以在基坑工程中使用PR-PHC管桩替代PRC管桩,减少钢筋使用量,促进碳减排。

     

    Abstract: When the prestressed concrete pipe piles with hybrid reinforcement (PRC pipe pile) are used as the supporting piles of foundation pits, in order to improve the utilization efficiency of non-prestressed reinforcement, it is proposed to use the pipe pile with non-prestressed reinforcement in the section as the supporting piles. Through the statistical analysis of the moment distribution of the supporting piles in 80 foundation pit projects in Tianjin, the full-scale bending tests and finite element analyses of the prestressed high-strength concrete pipe piles with partial hybrid reinforcement (PR-PHC pipe piles), the feasibility of the sectional reinforcement and the bending resistance of the PR-PHC pipe piles are studied. The research results show that the interval distribution of the bending moment of the pile shaft of single support row piles, inclined piles and cantilever piles has regularity. The non-prestressed reinforcement configured in the section of PR-PHC pipe piles can improve its ultimate bending bearing capacity and bending stiffness, and effectively improve the spread of pile cracks. The proposed numerical model can better reflect the actual situation of the tests. In addition, the adverse working conditions that may be encountered in the practical application of PR-PHC pipe piles are analyzed. It is proved that the PR-PHC pipe piles can be used to replace the PRC ones in foundation pit engineering, which reduces the use of reinforcement and promotes the carbon emission reduction.

     

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