| 循环荷载特征对焊接工字形钢支撑低周疲劳性能的影响 |
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| 引用本文： | 张耀春,连尉安,张文元.循环荷载特征对焊接工字形钢支撑低周疲劳性能的影响[J].地震工程与工程振动,2005,25(6):62-69. |
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| 作者姓名： | 张耀春 连尉安 张文元 |
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| 作者单位： | 哈尔滨工业大学,土木工程学院,黑龙江,哈尔滨,150090 |
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| 基金项目： | 国家自然科学基金“九五”重大项目（59895410）;建设部攻关课题（97-07-01） |
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| 摘 要： | 通过14根铰支焊接工字形支撑在不同特征的循环轴向位移荷载下的低周疲劳试验，研究了循环轴向位移荷载的位移幅值、平均位移幅值及加载次序等因素对钢支撑低周疲劳及耗能性能的影响。研究发现，对称循环荷载中幅值越小，支撑翼缘局部屈曲发展越晚，其耗能及承载力退化也越平缓。文中提出了支撑在幅值6δ≤Δδ≤12δy的对称循环荷载下的疲劳寿命经验公式。试验表明，循环荷载的位移幅值是支撑疲劳损伤及耗能退化的最主要影响因素，过载峰效应及适当的平均压位移幅值改善了钢支撑低周疲劳及耗能性能。
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| 关 键 词： | 支撑 低周疲劳 循环荷载 过载峰 |
| 文章编号： | 1000-1301（2005）06-0062-08 |
| 收稿时间： | 2005-03-20 |
| 修稿时间： | 2005-03-202005-05-15 |
Correlation between fatigue properties of welded I-section bracing members and characteristics of cyclic loading |
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| Zhang Yao-chun,Lian Wei-an,Zhang Wen-yuan.Correlation between fatigue properties of welded I-section bracing members and characteristics of cyclic loading[J].Earthquake Engineering and Engineering Vibration,2005,25(6):62-69. |
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| Authors: | Zhang Yao-chun Lian Wei-an Zhang Wen-yuan |
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| Institution: | School of Civil engineering, Harbin Institute of Technology Harbin 150090, China |
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| Abstract: | The low-cycle fatigue behavior and energy dissipation capacity of the welded I-section bracing members are investigated by 14 pinned-pinned bracing tests under the axial cyclic loading with different characteristics. Particular attention was paid to the effects of loading amplitude, mean amplitude and loading sequence. It is found that the inelastic local buckling, energy dissipation and degradation in load capacity depend on the loading amplitude. Some empirical formulas are developed on the basis of experimental data to estimate low-cycle fatigue life of welded and the effects of overloads and the mean compression amplitude can improve the fatigue performance of welded Isection bracing members. |
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| Keywords: | bracing members low-cycle fatigue cyclic loading overload |
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