钢管混凝土嵌岩桩力学性能研究综述

钢管混凝土嵌岩桩在内河航运工程中的应用日趋广泛。钢管作为混凝土填充的模板和钢筋,实现了每种材料(混凝土和钢)的最佳性能,同时提供两种材料相互补充,以缓解不良的失效模式。填料增加了管道的抗压强度和刚度,延迟和抑制了管道的局部屈曲,并在复合作用下提高了管道的延性和阻力。从理论、数值和试验分析的角度阐述了钢管混凝土嵌岩桩研究现状,包括横向承载特性、纵向承载特和钢-混凝土界面力学特性。最后对钢管混凝土嵌岩桩尚待研究的问题进行了展望,研究分析认为钢-混凝土界面局部劣化和发展是未来钢管混凝土嵌岩桩力学性能研究重点。

A Review of Studies on Mechanical Properties ofConcrete Filled Steel Tubular Rock-socketed Piles

With the development of inland waterway industry, the use of concrete-filled steel tubular (CFST) rock socketed pile is more and more extensive, and the research of its structural mechanical properties has gradually attracted the attention of researchers. As the formwork and reinforcement filled with concrete, steel tube can achieve the best performance of each material (concrete and steel), and provide two complementary materials to alleviate the bad failure mode. The filler increases the compressive strength and rigidity of the pipeline, delays and restrains the local buckling of the pipeline, and improves the ductility and resistance of the pipeline under the combined action. In this paper, the research status of concrete-filled steel tubular (CFST) rock socketed piles is described from the perspectives of theory, numerical value and experimental analysis, including transverse bearing characteristics, longitudinal bearing characteristics and mechanical properties of steel-concrete section. Finally, the problems that need to be studied are prospected, and the local deterioration and development of the steel-concrete interface are considered as the key points of the future research on the mechanical properties of CFST rock socketed piles.