高铁桥梁圆端形桥墩延性性能影响因素研究

Research on Influencing Factor of Ductility Performance of Round-ended Pier of Bridge over High Speed Rail

以某高铁桥梁圆端形桥墩为工程背景,运用ucfyber软件研究了混凝土强度、轴压比、配筋率、保护层厚度等参数对圆端形桥墩延性性能的影响。分析结果表明,混凝土强度过高和过低对结构的延性均有不利影响;轴压比的增加使桥墩的延性耗能能力迅速降低;增加纵向配筋率对桥墩的延性耗能能力同样不利;保护层厚度对桥墩延性性能的影响相对较小;圆端形桥墩横桥向的延性性能优于顺桥向。

Taking a round - ended pier of a bridge over a high speed rail as the engineering background, the research on the influence of parameters like concrete strength, axial compression ratio, ratio of reinforcement, thickness of protective layer and etc. on the ductility performance of round - ended pier is made by utilizing ucfyber software. The analysis results show that, too high and too low concrete strength have unfavorable influence on the ductility of the structure ; the increase of axial compression ratio can rapidly reduce the energy - dissipating capacity of ductility of the pier; the increase of longitudinal ratio of reinforcement is also unfavorable for the energy -dissipating capacity of ductility of the pier; the influence of thickness of protective layer on the ductility performance of the pier is relatively small; the ductility peffomlance of transverse direction of bridge of round - ended pier is superior to that of longitudinal direction of bridge.