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通过8个1∶2缩尺的T形截面钢异型柱在低周反复荷载作用下的拟静力试验,研究了试件的变形形态、破坏模态,得到了试件的滞回曲线、骨架曲线、承载能力、延性性能、耗能能力等抗震性能,分析了翼缘宽厚比、腹板高厚比和轴压比等参数对抗震性能的影响。考虑试件的初始缺陷、材料非线性和几何非线性进行了有限元计算分析。有限元计算和试验结果表明,在轴压比和翼缘宽厚比、腹板高厚比满足限值的条件下,T形截面钢异形柱在罕遇地震作用时,其破坏模态为局部屈曲失稳的塑性破坏,变形以塑性为主且发展较充分,有较高的承载能力,具备较好的延性性能和耗能能力,能够在强震区使用。本研究为工程应用和钢异形柱结构技术规程的编制提供参考。
Through 8 pseudo-static tests of 8 1: 2 scale T-shaped steel special-shaped columns under the low cyclic loading, the deformation morphology and failure mode of the specimens were studied. The hysteresis curves of the specimens, Curve, bearing capacity, ductility performance, energy dissipation capacity and other seismic performance, the influence of the parameters such as flange width to thickness ratio, web thickness to thickness ratio and axial compression ratio on the seismic performance is analyzed. The finite element analysis of the initial defect, the material nonlinearity and the geometric nonlinearity were taken into account. The results of finite element analysis and experimental results show that under the conditions of axial compression ratio and flange width-to-thickness ratio and web thickness-thickness ratio, the failure mode of T-shaped steel special-shaped column in the rare earthquakes is local buckling Unstable ductile plastic deformation, plastic deformation-based and more fully developed, high carrying capacity, with good ductility and energy dissipation capacity, can be used in the earthquake area. This study provides a reference for the engineering application and the preparation of the technical regulation of steel special-shaped column structure.