|Table of Contents|

Study on Flutter Stability of Long-span Asymmetric Suspension Bridges(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年05期
Page:
84-93
Research Field:
结构工程
Publishing date:

Info

Title:
Study on Flutter Stability of Long-span Asymmetric Suspension Bridges
Author(s):
HAO Jian-ming1;  ZHANG Yao-yao1;  SHU Peng2
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Chongqing Municipal Research Institute of Design, Chongqing 400020, China)
Keywords:
asymmetric suspension bridge;  flutter stability;  torsional frequency ratio;  flutter critical wind speed
PACS:
U448.25
DOI:
10.19815/j.jace.2022.05063
Abstract:
In order to study the flutter stability of long-span asymmetric suspension bridge under different asymmetric types, a suspension bridge with unequal height support and main span of 628 m was taken as the engineering background. The flutter stability of the suspension bridge was analyzed based on the full modal three-dimensional frequency domain flutter analysis method. The finite element analysis model of suspension bridge with unequal height support(height difference was 0-40 m)of main cable and asymmetric side span(side span difference was 0-40 m)was established by ANSYS, and the corresponding two-parameter search iterative APDL calculation program was compiled for three-dimensional flutter stability analysis. The results show that when the unequal height suspension bridge is constructed, with the increase of the bearing height difference, the low-order modal frequency changes little and the high-order modal range decreases gradually. The bending-torsion frequency ratio decreases with the increase of the support height difference. The larger the height difference, the faster the bending-torsion frequency ratio decreases. The critical wind speed of bridge flutter decreases with the increase of support height difference, which makes the flutter stability of long-span suspension bridge structure decrease due to the asymmetric structure caused by the unequal height difference of main cable. When constructing side span asymmetric suspension bridge, the bending-torsion frequency ratio decreases with the increase of side span difference. With the increase of the difference of supporting span, the flutter critical wind speed of suspension bridge beam structure decreases, but the difference is very small, almost no effect. When the difference of side span is small, the flutter stability of suspension cable structure can be almost ignored.

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Last Update: 2022-09-30