Abstract Under seismic loading, a cyclic deterioration in strength and stiffness of high-strength steel beam-column can be caused by two main damage modes including local buckling and low-cycle fatigue, which can remarkably change the cyclic response and needs to be considered in seismic design for high-strength steel beam-column. Driven by this need, a hysteretic model considering cyclic deterioration is investigated for H-section beam-column made of high-strength steel with a specified yielding strength of 690 MPa (Q690 steel). First, the effects of the key factors including flange and web slenderness, axial load ratio, and lateral load amplitude on the damage evolution are numerically analyzed using the validated finite element model for Q690 steel beam-columns. Second, according to the results of parametric analysis, the deterioration law and damage index are proposed and calibrated considering two damage-driven modes: local buckling and low-cycle fatigue. Finally, incorporating the developed deterioration evolution law together with damage index, a hysteretic model is developed and calibrated for Q690 steel beam-columns with cyclic deterioration. The proposed hysteresis model with cyclic deterioration is further validated against the test results of Q690 steel beam-columns. It could be concluded that the increase of the axial load ratio, flange and web slenderness and loading amplitude, may result in the increase of cyclic deterioration in high-strength steel beam-column and compared with low-cycle-fatigue-driven mode, local-buckling-driven mode may result in a more significant cyclic deterioration. It also demonstrates that the proposed hysteresis model with cyclic deterioration can reasonably predict the cyclic response of Q690 steel beam-columns.

中文翻译：

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考虑循环劣化的Q690高强钢梁柱滞回模型

摘要 在地震荷载作用下，局部屈曲和低周疲劳两种主要损伤模式可引起高强钢梁柱强度和刚度的循环恶化，显着改变循环响应，需要考虑高强钢梁柱抗震设计[J]. 在这种需要的推动下，研究了由规定屈服强度为 690 MPa（Q690 钢）的高强度钢制成的 H 型截面梁柱的考虑循环退化的滞回模型。首先，利用经过验证的Q690钢梁柱有限元模型，数值分析了翼缘和腹板细长、轴向载荷比、横向载荷幅值等关键因素对损伤演化的影响。二、根据参数分析结果，考虑两种损伤驱动模式：局部屈曲和低周疲劳，提出并标定了退化规律和损伤指数。最后，结合改进的退化演化规律和损伤指数，建立并标定了具有循环退化的Q690钢梁柱的滞回模型。针对 Q690 钢梁柱的测试结果进一步验证了所提出的具有循环退化的滞后模型。可以得出结论，轴荷比、翼缘和腹板细长和加载幅度的增加，可能导致高强钢梁柱的循环劣化增加，与低周疲劳驱动模式相比，局部-屈曲驱动模式可能导致更显着的循环恶化。