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Wind and Structures
  Volume 16, Number 3, March 2013 , pages 279-300

Linear regression analysis of buffeting response under skew wind
Zengwei Guo, Yaojun Ge, Lin Zhao and Yahui Shao

    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.
Key Words
    bridge; linear regression; skew wind; buffeting; internal force
Zengwei Guo, Yaojun Ge, Lin Zhao and Yahui Shao : State Key Laboratory of Disaster Reduction in Civil Engineering, Department of Bridge Engineering, Tongji University, shanghai 200092, P. R. China

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