华南理工大学学报（自然科学版）2025，Vol.53Issue(12)：117-125,9.DOI:10.12141/j.issn.1000-565X.250078
大跨度坦拱桥拱脚钢-混结合段模型试验研究
Model Test Study on Steel-Concrete Joint Segment of Arch Foot of A Long-Span Flat Arch Bridge
摘要
Abstract
To investigate the stress behavior and load-transfer mechanism at the steel-concrete joint segment of a flat arch bridge,this study takes a flat arch bridge in Guangdong with a calculated span of 196 m as the engineering background.Based on the Abaqus platform,a refined finite element model of the steel-concrete composite arch abutment was established to analyze the stress level and distribution characteristics of the structure under six unfa-vorable load cases.In addition,a 1∶8 scaled patial model was fabricated for multi-condition loading tests to study the mechanical behavior of the steel-concrete joint segment under different scenarios.The results indicate that,un-der all loading cases,the stress in the bottom plate of the steel arch box is most significant,making it the primary load-bearing component,with a maximum stress of-116.875 MPa.In the stress distribution of the bottom plate,the stiffening ribs play a major role,exhibiting the most prominent stress levels compared to other areas.The web area adjacent to the bottom plate of the steel arch box experience the next highest stresses,with a maximum value of-32.16 MPa across all conditions.The stress level in the top plate of the steel arch box is relatively low.The mea-sured stress values in the concrete pile cap are generally small,with a maximum stress not exceeding-0.73 MPa.The axial compressive stress in the steel arch box gradually decreases from the loading end to the concrete pile cap end.When subjected to loads,the steel arch box primarily transfers the applied loads to the concrete pile cap through the bottom plate and the adjacent web regions.Under all test conditions,the stress level at the steel-concrete joint segment is relatively low,as most of the stress from the bottom plate of the steel arch box is dispersed into the concrete pile cap via components such as PBL shear connectors,bearing plates,densely arranged stiffening ribs,and penetrating reinforcement bars.关键词
坦拱桥/拱脚/钢-混结合段/模型试验/有限元模型Key words
flat arch bridge/arch foot/steel-concrete joint segment/model test/finite element model分类
交通工程引用本文复制引用
刘文硕,李昂,王海龙,罗琼,李建全..大跨度坦拱桥拱脚钢-混结合段模型试验研究[J].华南理工大学学报（自然科学版）,2025,53(12):117-125,9.基金项目
国家自然科学基金项目(52278234) （52278234）
湖南省自然科学基金项目(2022JJ30728)Supported by the National Natural Science Foundation of China(52278234)and the Natural Science Founda-tion of Hunan Province(2022JJ30728) （2022JJ30728）
