摘要
为了从风洞试验测量的位移响应中较好地识别出钢管混凝土输电塔的风荷载，本文对荷载识别过程进行了模拟。首先选择了3种类型的风荷载谱并将它们分区施加于输电塔的多质点模型上，利用随机振动理论计算出结构的位移功率谱；然后，推导出了从几个测点的位移功率谱识别分区风荷载谱的方法，并定义了评价识别效果的误差指标；最后，分析了测量精度、测点数量及位置、模态数及风荷载系数等对荷载识别精度的影响，得到一些对实际风洞试验具有重要指导价值的结论。
Abstract
In order to better identify several wind load spectra of a long-span concrete filled steel-tube transmission tower from displacements investigated by wind tunnel tests, wind load identificaton processes were simulated by computer. Firstly, selecting three kinds of wind load spectra and acted on model of transmission tower, the structure displacemental spectra were computed by random vibraton method. Then, a method was introduced to identify several dynamic wind load spectra from displacemental spectra of several measuring points and error coefficient was defined to evaluate identificaton effectiveness. Finally, some factors, such as measurement accuracy, number and position of measuring points, modes taken and wind load coefficient,et al, having effect on accuracy of wind load identification were discussed and some important conclusions were gotten so as to guide actual wind tunnel tests.
关键词
荷载识别 /
输电塔 /
风荷载谱 /
风洞试验 /
钢管混凝土
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Key words
Load identification /
Transmission
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熊铁华;梁枢果.
大跨越钢管混凝土输电塔顺风向分区风荷载谱识别方法[J]. 振动与冲击, 2012, 31(23): 26-31
Xiong Tiehua;Liang Shuguo.
Several along-wind load spectra identification of a long-span concrete filled steel-tube transmission tower[J]. Journal of Vibration and Shock, 2012, 31(23): 26-31
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