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【目的】为了研究组合剪力键在高强钢和高强混凝土协同工作中发挥的作用，该文对自带高强钢销栓钉-UHPC组合梁中组合剪力键的抗剪性能开展研究.【方法】设计6个推出试件进行推出试验，对试件破坏形态、抗剪承载力和变形等方面进行分析，并建立组合剪力键的有限元分析模型，研究组合剪力键的不同栓钉直径、钢销形状、栓钉距边缘距离、钢材强度等参数对其抗剪承载力及变形的影响规律.【结果】自带高强钢销栓钉-UHPC梁中组合剪力键主要发生钢销屈服、栓钉剪断现象和混凝土劈裂等破坏形态，其中钢材强度与栓钉边缘距离对其承载能力影响最大.【结论】自带高强钢销栓钉-UHPC组合剪力键的抗剪性能方面优于传统栓钉剪力键，栓钉直径为16 mm具有更高的延性，S2型钢销和栓钉焊接位置靠近根部的极限承载力提升较为明显.
Abstract：【Objective】In order to study the role of composite shear keys in the synergistic action of high-strength steel and high-strength concrete, this paper investigates the shear performance of composite shear keys in beams with built-in high-strength steel dowel-UHPC composite beams.【Method】Six push-out specimens were designed for push-out tests, and the failure modes, shear bearing capacity, and deformation of the specimens were analyzed.A finite element analysis model of the composite shear keys was established to study the effects of different dowel diameters, steel dowel shapes, edge distance of dowels, and steel strength on the shear bearing capacity and deformation of the composite shear keys.【Result】The results indicate that in beams with built-in high-strength steel dowels-UHPC, the composite shear keys mainly experience failure modes such as steel dowel yielding, dowel shearing, and concrete splitting, where the steel strength and the edge distance of the dowels have the greatest impact on their bearing capacity.【Conclusion】In terms of shear performance, the stud with a high-strength steel pin-UHPC composite shear key is superior to the traditional stud shear key.The stud with a diameter of 16mm has higher ductility, and for the S2 type steel pin, the ultimate bearing capacity significantly increases when the stud is welded close to the root.
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基本信息:
DOI：10.13715/j.issn.2096-644X.20250930.0001
中图分类号:TU398.9
引用信息:
[1]陈俊,王康奇,陈博照,等.自带高强钢销栓钉-UHPC组合剪力键抗剪性能研究[J].湘潭大学学报(自然科学版),2026,48(03):28-41.DOI:10.13715/j.issn.2096-644X.20250930.0001.
基金信息:
湖南省自然科学基金-企业联合基金项目(2024JJ9067)
2025-09-30
2025
2026-06-13
2026-07-08
2026
1
2026-04-09
2026-04-09
2026-04-09