(中国建筑西南设计研究院有限公司，成都 610081)

［摘要］   以一个跨度199m、宽跨比仅1/132，且地处峡谷的钢结构柔性悬索桥为工程背景，采用ANSYS有限元软件进行了大跨极窄人行悬索桥动力特性及非线性风振响应研究。结果表明，该类桥的基本周期较通常的大型公路悬索桥明显偏短，采用抗风缆的抗风措施能够改变结构振型的排列顺序和改善结构抗风性能；采用基于线性滤波法的自回归(AR)模型应用MATLAB模拟了考虑桥址风特性的水平及竖向脉动风时程，结果表明满足分析与设计需求；比较了水平及水平和竖向风工况下有无抗风措施时悬索桥的非线性风振响应，结果表明结构抗风性能满足安全要求。
［关键词］   大跨极窄悬索桥；   动力特性；   桥址风特性；   非线性风振；   抗风措施

Research on dynamic characteristics and wind vibration response of a
 pedestrian large-span and slender suspension bridge
Xiong Yaoqing, He Yunming, Wu Xiaobin
(China Southwest Architectural Design and Research Institute Co., Ltd., Chengdu 610081, China)
Abstract:Based on a steel truss flexible suspension bridge in mountainous area，which has the main span of 199m and the wide-span ratio of 1/132, the dynamic characteristics and nonlinear wind vibration response of the pedestrian large-span and slender suspension bridge were analyzed by ANSYS. The results indicate that the basic period of the bridge is shorter than that of general large highway suspension bridge obviously, and the wind fortification measures can change dynamic characteristic of the suspension bridge and can increase its wind resistance performance. Considering the wind characteristics of the bridge site, the wind load history was simulated with AR model by MATLAB program. Compared the nonlinear wind vibration response with and without fortification measures under horizontal and horizontal & vertical wind load, it shows that the wind resistance performance of the bridge is qualified when it comes to safety requirement.
Keywords:large-span and slender suspension bridge; dynamic characteristic; wind characteristics of the bridge site; nonlinear wind vibration; wind fortification measures
作者简介：熊耀清，博士，高级工程师，Email:xyq729730@163.com。

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