波纹钢-喷射高强混凝土组合拱静力性能试验研究

To address the limitations of load-bearing capacity and stiffness encountered in corrugated steel arches used for medium-span or high-load culverts and bridges, a composite arch composed of corrugated steel and sprayed high-performance concrete is proposed. This composite arch demonstrates superior load-bearing capacity, higher initial stiffness, and improved construction efficiency. To evaluate its mechanical behavior, static load tests were conducted on two composite arches with a span of 6 m (with sprayed high-strength concrete thicknesses of 19 mm and 33 mm, respectively) and one corrugated steel arch as a reference. Test results indicate that, compared to the corrugated steel arch, the composite arch achieved maximum increases of 57. 1% in load-bearing capacity and 23. 7% in initial stiffness. The failure mode of the composite arch was characterized by the development of full-depth primary cracks in the high-strength concrete layer within the negative bending moment zone, accompanied by local buckling of the corrugated steel and interfacial debonding. In contrast, the failure mode of the corrugated steel arch was dominated by buckling in the negative moment region. Moreover, the stress level in the corrugated steel at critical sections was significantly reduced in the composite arch compared to the conventional steel arch. When a modified epoxy adhesive was used at the interface, effective composite action between the corrugated steel and high-strength concrete was maintained under load levels up to 60% of the ultimate load; beyond this level, the composite action gradually degraded. However, when shear connectors were employed at the interface, such degradation was not observed.