Wind and Structures

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Numerical analysis of a long-span bridge response to tornado-like winds

  • Hao, Jianming (School of Highway, Chang'an University) ;
  • Wu, Teng (Department of Civil, Structural and Environmental Engineering, University at Buffalo)
  • Received : 2020.01.14
  • Accepted : 2020.11.21
  • Published : 2020.11.25
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Abstract

This study focused on the non-synoptic, tornado-like wind-induced effects on flexible horizontal structures that are extremely sensitive to winds. More specifically, the nonuniform, intensive vertical wind-velocity and transient natures of tornado events and their effects on the global behavior of a long-span bridge were investigated. In addition to the static part in the modeling of tornado-like wind-induced loads, the motion-induced effects were modeled using the semi-empirical model with a two-dimensional (2-D) indicial response function. Both nonlinear wind-induced static analysis and linear aeroelastic analysis in the time domain were conducted based on a 3-D finite-element model to investigate the bridge performance under the most unfavorable tornado pattern considering wind-structure interactions. The results from the present study highlighted the important effects due to abovementioned tornado natures (i.e., nonuniform, intensive vertical wind-velocity and transient features) on the long-span bridge, and hence may facilitate more appropriate wind design of flexible horizontal structures in the tornado-prone areas.

Keywords

Acknowledgement

The support for this project provided by the Fundamental Research Funds for the Central Universities CHD (Grant No. 300102210108), the Innovation-Driven Project of Central South University (No. 2020CX009) and the Center for Computational Research at the University at Buffalo is gratefully acknowledged.

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