| Citation: | HE Fu-yun, LI Cong, CHEN Bao-chun, BRISEGHELLA Bruno. Full-process test of in-plane load-bearing of steel tube reinforced concrete arch[J]. Journal of Traffic and Transportation Engineering, 2026, 26(5): 205-218. doi: 10.19818/j.cnki.1671-1637.2026.040
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To investigate the in-plane mechanical behavior of steel tube reinforced concrete (STRC) arch and the composite interaction mechanism of all components, comparative full-range loading tests and refined finite element (FE) analysis were conducted on STRC arch, as well as the corresponding outer reinforced concrete (RC) and inner concrete-filled steel tube (CFST) arches. The failure modes, load-deflection (strain) curves, and crack development of all specimens were tested. The composite interaction mechanism between the outer RC and inner CFST in STRC arches was elucidated. The experiment results show that under a concentrated load applied at the 1/4 span section, four plastic hinges formed at the 1/4 span, 3/4 span, and both arch springing sections, resulting in an anti-symmetric failure. The full-range loading process can be divided into three stages: elastic, cracking development, and failure. The load-deflection curve of the STRC arch is generally consistent with that of the RC arch, and both exhibit similar overall deformation at the ultimate load-bearing capacity. However, the inner CFST remains in the elastic-plastic stage, indicating asynchronous loading. Considering asynchronous and synchronous conditions, the measured load-bearing capacity of the STRC arch is approximately 1.25 and 1.40 times the sum of the capacities of the corresponding RC and CFST arches, respectively, demonstrating a positive composite effect. The FE results show that significant stress redistribution occurs in the section after cracking of the outer concrete, leading to pronounced interaction between the outer RC and inner CFST. The inner CFST effectively restrains crack development in the outer concrete, thereby enhancing both the post-cracking stiffness and ultimate load-bearing capacity. The findings provide a reference for the calculation of load-bearing capacity and the analysis of composite interaction between the outer RC and inner CFST in STRC arches.
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