湖南大学学报（自然科学版）2025，Vol.52Issue(5)：41-56,16.DOI:10.16339/j.cnki.hdxbzkb.2025046
界面不同抗剪连接的预制UHPC组合梁抗弯性能试验研究
Experimental Study on Flexural Performance of Prefabricated UHPC Composite Beams with Different Interface Shear Connections
摘要
Abstract
Ultra-high performance concrete(UHPC)composite beams,formed by the UHPC precast beams and precast bridge slabs through cluster shear connectors,have a wide range of applications in prefabricated structures.Four-point bending tests were conducted on three prefabricated UHPC composite beams with different degrees of shear connection(0.47,0.94 and 1.41 respectively)and one UHPC cast-in-place beam for clarifying the flexural performance of prefabricated UHPC composite beams.The results show that the shear connection degree has a significant impact on the flexural performance of prefabricated UHPC composite beams.For the composite beams with shear connection degrees of 0.47 and 0.94,diagonal cracks appeared on the web of the prefabricated beams below the edge pocket due to the large shear force caused by the shear keys,which finally led to the failure of the shear keys.The flexural capacities of the prefabricated UHPC composite beams with shear connection degrees of 0.47,0.94 and 1.41 were 76%,97%and 100%of that of the cast-in-place beam,respectively.The ductility coefficients for these beams were 28%,38%and 37%of that of the cast-in-place beam.Additionally,their elastic stiffness before cracking was 52%,72%and 85%of that of the cast-in-place beam,respectively.A calculation method for the flexural capacity of prefabricated UHPC composite beams with different shear connection degrees was provided,and its applicability was verified through experimental results.关键词
超高性能混凝土/预制组合梁/剪力连接度/抗弯承载能力Key words
ultra-high performance concrete(UHPC)/prefabricated composite beams/degree of shear connection/flexural capacity分类
交通运输引用本文复制引用
方志,鲁睿,洪金圣,何德华,王晓璜,陈建宁,黄佳俊..界面不同抗剪连接的预制UHPC组合梁抗弯性能试验研究[J].湖南大学学报（自然科学版）,2025,52(5):41-56,16.基金项目
国家自然科学基金资助项目(51938012),National Natural Science Foundation of China(51938012) （51938012）
