Study on the driving comfort during vertical vortex-induced vibration for the long-span bridge
Han Xiao,Zhiwen Liu,Zhijun Jiang,Zhengqing Chen,Klaus Thiele,Yabing Xin
Abstract
The vortex-induced vibration (VIV) is prone to occur in the long-span bridges in operation within the
specific wind speed range, which can lead to the issues of structural durability and driving comfort. To quantitatively
assess driving comfort and limit values of VIV based on comfort criteria, a method for analyzing the driving comfort
of long span bridges under VIV is proposed using Matlab/Simulink modules in this study. Based on the established
method, the VIVs of the Humen Bridge in China and the corresponding traffic control measures are analyzed based
on human comfort levels. Firstly, a four-wheel stochastic road excitation model, an eight-degree-of-freedom vehicle
model, and a nine-degree-of-freedom seated human body model are established, respectively. Secondly, combined
with the established models, the VIV response is converted into wheel excitation and the root mean square (RMS) of
comprehensive weighted acceleration of the human body is obtained. Furthermore, based on the VIV observed on
the Humen Bridge in China, the driving comfort of passengers and limit value of VIV are further studied by the finite
element software LS-DYNA and the established models in this study. The results show that the RMS of the human
body in the car calculated with the proposed method in this study agree well with the results of commercial software
LS-DYNA. Moreover, by reducing vehicle speed, the comfort level of human body during driving can change from
‘A Little Uncomfortable’ to ‘Not Uncomfortable’, ensuring the normal operation of the Humen Bridge and
preventing disruptions caused by traffic closures.
Han Xiao — 1)State Key Laboratory of Bridge Safety and Resilience, College of Civil Engineering, Hunan Univ, Changsha, Hunan, 410082, China 2) College of Civil Engineering, Hunan Univ., Changsha 410082, China 3) Institute of Steel Structures, Technische Universität Braunschweig, Braunschweig, 38106, Germany
Zhiwen Liu — 1)State Key Laboratory of Bridge Safety and Resilience, College of Civil Engineering, Hunan Univ, Changsha, Hunan, 410082, China 2) College of Civil Engineering, Hunan Univ., Changsha 410082, China
Zhijun Jiang — College of Civil Engineering, Hunan Univ., Changsha 410082, China
Zhengqing Chen — 1)State Key Laboratory of Bridge Safety and Resilience, College of Civil Engineering, Hunan Univ, Changsha, Hunan, 410082, China 2)College of Civil Engineering, Hunan Univ., Changsha 410082, China
Klaus Thiele — Institute of Steel Structures, Technische Universität Braunschweig, Braunschweig, 38106, Germany
Yabing Xin — Hunan Construction Investment Transportation Construction Co., Ltd, Changsha, Hunan, 410004, China
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