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钢管混凝土格构柱正成为一种新型的桥墩结构,为全面了解其力学性能,研究钢管混凝土组合格构柱的弯曲性能,以指导工程应用。以大跨连续刚构桥的高墩为研究对象,进行缩尺模型的弯曲破坏试验,并采用有限元程序ANSYS进行全过程模拟。试验结果表明:结构的弯曲变形分为弹性阶段、弹塑性阶段、塑性阶段、下降段4个阶段,结构具有良好的塑性变形性能和整体工作性能,在极限荷载作用下,发生典型的延性破坏;组合截面在开裂前,基本符合平截面假定,组合截面在开裂后,不符合平截面假定;提出了抗弯极限承载力较为精确的有限元计算方法;参数影响分析表明,结构的抗弯极限承载力与钢管强度和截面高宽比呈等比例增长,受内填混凝土强度影响较小。
The CFST Lattice Column is becoming a new type of pier structure. To fully understand the mechanical properties of the CFST Lattice Column, the flexural behavior of the CFST Lattice Columns is studied to guide the engineering application. Taking the high pier of long span continuous rigid frame bridge as the research object, the bending failure test of the scale model was carried out and the whole process simulation was carried out by the finite element program ANSYS. The results show that the structure is divided into four stages: elastic stage, elastic-plastic stage, plastic stage and descending stage. The structure has good plastic deformation performance and overall working performance. Under ultimate load, typical ductile damage occurs. The composite section is basically consistent with the assumption of flat section before cracking, the combined section does not meet the assumption of flat section after cracking, and the finite element method with more accurate ultimate bearing capacity is proposed. The parameter influence analysis shows that the ultimate load- The strength increases proportionally with the strength of the steel pipe and the aspect ratio of the concrete, and is less affected by the strength of the concrete filled in.