- 摘 要
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(中國建筑西南設計研究院有限公司，成都 610081)
［摘要］ 以一個跨度199m、寬跨比僅1/132，且地處峽谷的鋼結構柔性懸索橋為工程背景，采用ANSYS有限元軟件進行了大跨極窄人行懸索橋動力特性及非線性風振響應研究。結果表明，該類橋的基本周期較通常的大型公路懸索橋明顯偏短，采用抗風纜的抗風措施能夠改變結構振型的排列順序和改善結構抗風性能；采用基于線性濾波法的自回歸(AR)模型應用MATLAB模擬了考慮橋址風特性的水平及豎向脈動風時程，結果表明滿足分析與設計需求；比較了水平及水平和豎向風工況下有無抗風措施時懸索橋的非線性風振響應，結果表明結構抗風性能滿足安全要求。
［關鍵詞］ 大跨極窄懸索橋； 動力特性； 橋址風特性； 非線性風振； 抗風措施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
作者簡介：熊耀清，博士，高級工程師，Email:xyq729730@163.com。參考文獻
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