三管梭形钢格构柱缩尺模型破坏性稳定试验研究

本文对广州新白云国际机场航站主楼三根三管梭形格构柱缩尺模型进行了立式破坏性稳定试验研究,侧重研究直立三管梭形格构柱在两端铰接约束,竖向轴压情况下的破坏特性与破坏机理,并探讨了稳定极限承载力、变形过程。三管梭形格构柱缩尺模型的比例分别为1/4、1/5、1/6,长度分别是4.7m、4.5m和4.9m,管径分别为68×4、58×4和58×4。缩尺试验在足尺试验的基础上进一步检验有限元分析结果的正确性。在破坏形状与位置、荷载-位移曲线、稳定极限承载力等内容方面,通过试验结果与有限元数值计算结果进行比较表明,二者吻合较好。

Experimental Investigation to Small-scale Model of 3-Pipe Shuttle-shape Steel Latticed Column

A model experimental program to investigate the load carrying capacity and failure mechanism of the shuttle shape latticed column formed by three steel pipes and horizontal diaphragms (SLC) has been carried out. Three SLC model each with a scale of 1/4,1/5,1/6 have been tested in vertical position under axial compressive load. The results obtained from the test were compared with those of the FEM analysis involved in large deformation elastic plastic range indicating that they are in a very good agreement. It has been verified from both the experimental investigation and the FEM analysis that the SLC either failed in single wave deformation mode or in "S"deformation mode is distinctively dependant on its slenderness, length, numbers and thickness of horizontal diaphragms, and geometric imperfection distribution forms as well.