梭形钢管格构柱弹性屈曲性能

Elastic Buckling Behavior of Shuttle-shape Steel Latticed Column

本文利用有限元方法研究和探讨了单管、双管及三管梭形钢格构柱在两端铰接约束,竖向轴压情况下的弹性屈曲性能和对应的屈曲模态,对影响梭形柱弹性屈曲荷载与屈曲模态的因素进行了系统的参数分析,如柱高、柱长细比、隔板厚度、隔板数量等。根据分析结果阐述了梭形钢格构柱的两种屈曲模态及其转变特性,提出了提高弹性屈曲荷载的有效措施,总结了梭形钢格构柱与等截面柱明显不同的弹性屈曲性能。最后介绍了关于梭形钢格构柱弹性屈曲的理论研究成果在广州新白云国际机场航站楼实际工程中的应用意义。

Shuttle shape lattice column (SLC) formed by steel pipes and horizontal diaphragms as a latticed column with varying section is being used and extended to many public buildings recently. In this paper, elastic buckling behavior of SLC subjected to axial compressive forces has been investigated theoretically by employing a powerful finite element analysis package ANSYS. Three kinds of latticed columns constrained by pin connections at two ends are involved in the analysis. They are single steel pipe column, two steel pipe latticed column and three steel pipe latticed column where the two or three pipes are combined as a whole by welding horizontal diaphragms to the pipes. Parameter studies for the elastic bifurcation buckling and corresponding buckling mode of the latticed columns have been carried out. The obtained results indicates that the SLC generally behaves as two different buckling modes which are dependant on their slenderness ratio, length, numbers and thickness of horizontal diaphragms, and so on. This conclusion is very helpful to design such SLC employed in Guangzhou New Baiyun International Airport.