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按照强震区多、高层钢框架结构柱的受力工况,以现行国标型钢组合的工程应用为目标,设计不同轴压比下不同翼缘宽厚比与不同腹板高厚比组合的36个十字形截面钢异形柱模型,模型截面应力相似系数为1,缩尺比为1∶2。考虑试件的初始缺陷和材料非线性,对这些模型系统地进行常轴力、低周反复荷载下的有限元计算。模拟模型的受力、变形、破坏全过程,研究变形模式、破坏模态、滞回性能、承载能力、耗能能力等抗震性能,并分析翼缘宽厚比、腹板高厚比和轴压比对抗震性能的影响规律,对模型的整体抗震性能进行综合评价。最后,基于抗震设计承载力取值和整体抗震性能的要求,提出不同轴压比下,能够在强震区使用的十字形截面钢异形柱翼缘宽厚比与腹板高厚比的组合限值,为工程应用和钢异形柱结构技术规程的编制提供理论依据。
According to the stress conditions of high-rise steel framed structural columns with many strong earthquake regions and the application of the existing national standard steel combination, the design of different ratios of flange width to thickness and different thicknesses of webs under different axial compression ratios A cross-section steel cross-section column model, the model section stress similar coefficient of 1, scale ratio of 1: 2. Considering the initial defects of the specimen and the material nonlinearity, these models are systematically investigated by finite element method under constant axial force and low cyclic loading. The whole process of stress, deformation and failure of the simulation model is simulated, and the seismic performance such as deformation mode, failure mode, hysteretic behavior, bearing capacity and energy dissipation capacity are studied. The ratio of flange width to thickness, On the seismic performance of the law, the overall seismic performance of the model for a comprehensive evaluation. Finally, based on the requirements of bearing capacity and overall seismic performance of seismic design, the combination limit of ratio of aspect ratio to web thickness of cross-section steel columns with special cross-section under cross-axial compression ratio Value, provide theoretical basis for the engineering application and the preparation of technical regulation of steel special-shaped column structure.