为研究罕遇地震情况下钢支撑的滞回性能,在已有试验研究的基础上,开展了数值模拟研究.详细分析了失稳发展过程及失稳形式、最大抗压承载力、屈曲后承载力、跨中最大横向变形、循环累积耗能等性能指标.总体上,数值模拟结果与试验结果及相关规范、文献结果吻合较好,且数值模拟结果的离散性要小于试验结果,验证了数值模拟分析的可信性.基于此,可得出推论:有限元可较精确地模拟支撑试件表面的应力应变分布,为后续基于应力应变进行支撑的低周疲劳损伤分析奠定了基础.%In order to investigate the hysteretic behavior of the bracing members under rare earthquakes, numerical simulation was conducted based on the comparing experiments. The key parameters, including the buckling process and the modes of the local buckling, the maximum compressive strength, the minimum post-buckling strength, the maximum lateral deformation and the cumulative dissipation energy are disscussed in detail. In general, the simulative results agreeds well with the tests, the relevant literatures and the codes, which indicates that the simulative results are credible. It is also found that the simulative discreteness is less than the test ones. Baesd on the results mentioned above, the conclusions are obtained that the stress and the strain distribution in the surface of the bracing members gained by the numerical analysis are in accordance with the true distribution, which lays a foundation for the low-cycle fatigue behavior analysis in the future.
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