中文摘要：

钢管混凝土格构桩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。

英文摘要：

CFST laced column is becoming a new structure type of bridge piers. In order to comprehensively understand its mechanical property, research on the bending property of CFST laced column for guiding engineering application, taking the high-rise piers of a long-span continuous rigid frame bridge as the study object, bending failure test and whole process simulation by finite element program ANSYS are carried out on the scale model. The test results indicate that （ 1 ） the bend deformation includes elastic stage, elastic-plastic stage, plastic stage and descending stage, and the structure has good plastic deformation ability and good overall working performance, it will be typically ductile damaged under ultimate load; （2） the plane-section assumption is applicable before combination section crack and it is not applicable after combination section crack; （3） a more accurate finite element method to calculate the ultimate flexural load carrying capacity of CFST laced column is presented; （4） analysis of parameter effect indicates that steel strength and section height-width ratio almost have some increasing proportion with the ultimate flexural load bearing capacity of CFST laced column, the strength of filled-in concrete has little influence on ultimate flexural load bearing capacity of CFST laced column.