Linear regression analysis of buffeting response under skew wind
Linear regression analysis of buffeting response under skew wind
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DOI：
10.12989/was.2013.16.3.279
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发表时间：
2013-03
影响因子：
1.6
通讯作者：
Zeng-wei Guo;Y. Ge;Lin Zhao;Y. Shao
中科院分区：
文献类型：
--
作者：
Zeng-wei Guo;Y. Ge;Lin Zhao;Y. Shao
本文提出了一种新的分析框架，用于预测斜风作用下桥梁构件的内部抖振力。基于数理统计理论，推导了正常风作用下的内部抖振力与变形之间的线性回归模型。应用该回归模型和风洞试验中不同偏航角的偏风作用下的抖振位移时程，可以直接得到桥梁构件的内部抖振力，而无需使用复杂的偏风作用下抖振分析理论。以主跨260 m的自锚式悬索桥和主跨450 m的钢拱桥为例，说明了这种线性回归框架的应用。结果表明，内部抖振力与位移之间的回归模型具有较高的意义，并且在适当的回归条件下也可以应用于斜风情况，而最不利的内部抖振力往往出现在偏航风下。
This paper presents a new analysis framework for predicting the internal buffeting forces in bridge components under skew wind. A linear regressive model between the internal buffeting force and deformation under normal wind is derived based on mathematical statistical theory. Applying this regression model under normal wind and the time history of buffeting displacement under skew wind with different yaw angles in wind tunnel tests, internal buffeting forces in bridge components can be obtained directly, without using the complex theory of buffeting analysis under skew wind. A self-anchored suspension bridge with a main span of 260 m and a steel arch bridge with a main span of 450 m are selected as case studies to illustrate the application of this linear regressive framework. The results show that the regressive model between internal buffeting force and displacement may be of high significance and can also be applied in the skew wind case with proper regressands, and the most unfavorable internal buffeting forces often occur under yaw wind.