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中文摘要：
在罕遇地震下，框架-中心支撑结构中的钢支撑常因局部屈曲位置的低周疲劳开裂而过早退出工作。本文在焊接工字形钢支撑低周疲劳试验研究基础上，提出了一种可用于框架-中心支撑体系非线性动力时程分析中钢支撑疲劳损伤评估的经验方法，并给出了相关步骤的算法流程。研究结果表明：本文方法以钢支撑轴向位移为损伤参量，能实时估算在随机位移荷载下钢支撑的低周疲劳累积损伤发展，并与试验结果吻合较好。
英文摘要：
Bracing members in concentrically braced structures may be subjected to large cyclic deformations due to local buckling during a severe earthquake causing possible early fractures. On the basis of experimental data, this paper presents an empirical criterion with its algorithm patterns, which may be included in the dynamic analysis of concentrically braced structures to predict the fracture of welded Ⅰ-section bracing members. Comparing experimental results with the numerical analytic results using the criterion, it is found that the criterion employs the axial deformations of bracing members as fatigue damage parameters and can be applied to real-time estimation of low-cycle fatigue damage of bracing members under a loading history-dependent random state.
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