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对西安咸阳国际机场二期扩建工程T3A航站主楼3根梭形柱进行1∶2缩尺破坏性稳定试验研究,分析轴压梭形钢管柱在一端固接、一端铰接约束下的稳定极限承载力,并探讨其破坏特性和机理。试验结果表明,其极限承载力达到设计荷载的2倍以上,满足设计要求。同时,采用有限元方法对试验进行模拟,并与试验得到的稳定极限承载力、破坏形状、荷载-位移曲线等进行对比,二者吻合较好。此外,基于有限元分析可知:试件长度比α增大,极限承载力提高;试件楔率γ增大,极限承载力降低;同时给出楔率γ与极限承载力Pu的拟合公式。
The 3-axis scale-breaking destructive stability test of the main building of T3A terminal in Xi’an Xianyang International Airport Phase II expansion project was carried out. The stability and ultimate bearing capacity of the axial-compression steel tubular column with one end fixed and one end articulated was analyzed. Force, and explore its destruction characteristics and mechanism. Test results show that the ultimate load capacity of more than 2 times the design load to meet the design requirements. At the same time, the finite element method was used to simulate the experiment, and compared with the test results of the ultimate stability, failure shape, load-displacement curve and so on. In addition, based on the finite element analysis, it can be seen that the ratio of the specimen length α increases and the ultimate bearing capacity increases. The wedge ratio γ of the specimen increases and the ultimate bearing capacity decreases. At the same time, the fitting formula of the wedge ratio γ and the ultimate bearing capacity Pu is given.