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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。
Taking a steel structure flexible suspension bridge with a span of 199m and a width-to-span ratio of only 1/132 and located in a canyon as an engineering background, the dynamic characteristics and nonlinear wind-induced vibration responses of the long-span and narrow-pedestrian suspension bridge with ANSYS finite element software are studied. The results show that the basic period of this kind of bridge is obviously shorter than that of the conventional large-scale suspension bridge. Wind-resistant wind-resistance measures can change the order of structure modes and improve the wind-resistance performance of the structure. Adopting the linear regression (AR) model is used to simulate the horizontal and vertical pulsating wind time history considering the wind characteristics at the bridge site. The results show that the requirements of analysis and design are met. The horizontal and horizontal wind and vertical wind conditions are compared with the suspension bridge The results show that the structural wind resistance can meet the safety requirements.