|Table of Contents|

Vortex-induced vibration characteristics of H-shaped cross-section with small aspect ratio under large attack angles(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年4期
Page:
118-128
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Vortex-induced vibration characteristics of H-shaped cross-section with small aspect ratio under large attack angles
Author(s):
GAO Guang-zhong1;  XU Zhao-sheng1;  XUE Xiao-feng1;  MA Teng-fei2; YAN Qing-chen3;  LI Jia-wu1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. China Design Group Co., Ltd., Nanjing 210014, Jiangsu, China; 3. JSTI Group Co., Ltd., Nanjing 210000, Jiangsu, China)
Keywords:
bridge engineering;  vortex-induced vibration;  synchronous vibration-pressure test;  H-shaped cross-section;  Scruton number;  turbulence wind field;  aerodynamic lift force
PACS:
U443.35
DOI:
10.19721/j.cnki.1671-8879.2025.04.010
Abstract:
To investigate the influences of mass-damping parameter(Scruton number)and incoming turbulence on vortex-induced vibration(VIV)characteristics of an H-shaped cross-section with small aspect ratio under large attack angles, the rigid hanger of the Zengjiayan Jialing River Bridge was taken as the engineering background, an elastically suspended segmental model of an H-shaped cross-section with an aspect ratio of 1.9 was designed, and synchronous vibration-pressure tests were conducted. The vibration tests were performed to examine the effects of Scruton number and incoming turbulence on VIV characteristics of the H-shaped cross-section under large attack angles. Combining with the wind pressure coefficient distribution of the H-shaped cross-section obtained from the pressure test, the influencing mechanism of incoming turbulence on the VIV characteristics was explained from the microscopic aerodynamic perspective. The research results indicate that the H-shaped cross-section with an aspect ratio of 1.9 exhibits crosswind VIV under a 30° attack angle. Increasing the Scruton number can effectively reduce the stable VIV amplitude of the H-shaped cross-section under large attack angles, with an approximately exponential decay trend, and the VIV lock-in range is narrowed. However, the vibration can not be fully suppressed only by increasing the Scruton number. The incoming turbulence significantly amplifies the crosswind VIV response. The fluctuating components in the turbulence wind field induce regular and intense vortex shedding around the model under static flow, generating a fluctuating aerodynamic lift force with a single dominant frequency close to the model's natural frequency, thereby triggering the VIV. It can be seen that the adverse effect of incoming turbulence must be considered in the VIV response of H-shaped cross-section with small aspect ratio under large attack angles.2 tabs, 16 figs, 30 refs.

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Last Update: 2025-07-25