| 风荷载作用下钢塔架的疲劳寿命预估 |
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| 引用本文： | 周春良,梁枢果. 风荷载作用下钢塔架的疲劳寿命预估[J]. 建筑技术开发, 2005, 0(3) |
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| 作者姓名： | 周春良 梁枢果 |
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| 作者单位： | 武汉大学土木建筑工程学院 武汉430072(周春良)，武汉大学土木建筑工程学院 武汉430072(梁枢果) |
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| 摘 要： | 结构的风致振动使得结构产生围绕平均应力的脉动应力 ,它能导致结构的疲劳累积损伤 ,可能造成结构在低于设计风荷载的各种水平风荷载往复作用下而失效。由于风荷载是钢塔架等钢结构的主要荷载 ,风荷载作用下上述结构的疲劳寿命预估因而是至关重要的。在作了一些简化假设后 ,得到了钢塔架疲劳寿命。由于塔架结构的顺风向响应为宽带过程 ,在考虑了窄带共振响应和宽带背景响应后 ,用等效窄带法得到了其疲劳寿命的计算公式。最后给出了一个疲劳寿命计算的工程实例。
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| 关 键 词： | 钢塔架 顺风向 背景响应 共振响应 疲劳寿命 |
PREDICTION OF FATIGUE LIFE OF STEEL TO WERS UNDER THE ACTION OF WIND LOAD |
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| Zhou Chun-liang Liang Shu-guo. PREDICTION OF FATIGUE LIFE OF STEEL TO WERS UNDER THE ACTION OF WIND LOAD[J]. Building Technique Development, 2005, 0(3) |
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| Authors: | Zhou Chun-liang Liang Shu-guo |
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| Affiliation: | Zhou Chun-liang Liang Shu-guo |
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| Abstract: | The wind-excited vibrations of structure make it produce fluctuating stresses around mean stress states that lead to fatigue damage accumulation and may induce structural failure because all kinds of wind without exceeding design wind act on it back and from.The prediction of fatigue life is important for steel towers and so on,because for this type of structure wind load is regarded as the main load.After making some simplifying assumptions,this paper obtains the fatigue life of steel towers.Because the along-wind response of steel towers is wide band process,after both narrow band resonant response and wide band background response are considered,the fatigue life is derived by the equivalent narrow band method.Finally an engineering example of calculation of fatigue life is given. |
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| Keywords: | Steel towers Along-wind Background response Resonant response Fatigue |
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