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刘   通¹ ,  蒋    鑫² ,  刘   学³

 

( 1. 广西高速公路投资有限公司高速公路总工程师办公室 , 南宁   530000 ;

2. 广西桂浦高速公路投资有限公司 , 南宁   530000 ;  3.  广西百宁高速公路投资有限公司 , 南宁    530000)

摘  要 :  为了研究大跨径连续刚构桥 PBL 剪力键的力学性能 。通过开展静载试验 , 研究了影响 PBL 剪力键承载能力的主要因素 , 并结合有限元分析了 PBL 剪力键的传力机理 。结果表明 : PBL 剪力键的承载力随着混凝土强度的提升和贯通钢筋直径的增大而显著增强 ; 适当增大钢板孔径有助于改善剪力键的受力性能 , 但当孔径达到一定阈值后 , 其对承载能力的提升效果逐渐减弱 , 继续增大孔径对整体结构的贡献趋于有限 ; PBL 剪力键的传力机制主要依赖贯通钢筋 、混凝土及钢板的协同作用 , 确保轴力和剪力的高效传递 。此研究可为后续大跨径桥梁钢混结合段中 PBL 剪力键的应用提供了重要的理论依据和实践参考。

关键词 : 连续刚构桥 ; PBL 剪力键 ; 有限元分析 ; 静载试验

中图分类号 : U448. 2           文献标志码 : A           文章编号 :  1005- 8249  (2026)  03-0157-05

DOI :10. 19860/j. cnki. issn1005- 8249. 2026. 03. 026

 

LIU Tong¹ , JIANG Xin² , LIU Xue³

( 1. Highway Chief Engineer Office , Guangxi Highway Investment Co. , Ltd. , Nanning 530000 , China;

2. Guangxi Guipu Highway Investment Co. , Ltd. , Nanning 530000 , China;

3. Guangxi Baining Highway Investment Co. , Ltd. , Nanning 530000 , China)

Abstract :  This study investigates the mechanical performance of PBL shear keys in large-span continuous rigid frame bridges. Through static load tests , the key factors affecting the load-bearing capacity of PBL shear keys  are examined , and the force transfer mechanism of the shear keys is analyzed using finite element modeling.   The experimental results indicate that the load- bearing capacity of PBL  shear  keys  significantly  increases  with higher concrete strength and larger diameters of  the through reinforcement.   An appropriate increase in the steel plate hole diameter improves the shear key's performance.   However , beyond a certain threshold , the effect of further enlarging the hole diameter on enhancing the load-bearing capacity gradually diminishes , and further increases in hole size offer limited benefits to the overall structural performance.   The force transfer mechanism of the PBL shear  key  primarily  relies  on  the synergistic  interaction between the through reinforcement , concrete , and steel plate , ensuring efficient transmission of axial and shear forces.   This  research  provides important theoretical foundations and practical insights for the application of PBL shear keys in steel-concrete composite sections of large-span bridges.

Key words :  continuous rigid frame bridge ; PBL shear key; finite element analysis ; static load test