景观装饰无背索斜拉桥力学性能研究

Study on Mechanical Properties of Landscape Decoration Cable-stayed Bridge without Backstays

摘要:

为了研究景观装饰无背索斜拉桥力学性能，建立了景观桥梁结构有限元模型，计算了满足景观效果的无背索斜拉桥合理索力，同时，结合无背索斜拉桥结构特点，计算了各类荷载组合作用下无背索斜拉桥各构件应力、竖向挠度及结构动力响应，并分析了景观索对结构承载力和弹性支撑的贡献。研究表明，基于梳理提出的景观装饰无背索斜拉桥合理索力确定方法，可以得出满足景观需求的拉索索力，同时计算结果显示景观索对桥梁结构承载力贡献较少。进行景观装饰无背索斜拉桥动力计算时，景观索对结构第一、第二阶振型及振型参与质量方向影响较小，对于仅关注基频指标的景观装饰无背索斜拉桥动力计算可以不考虑景观索力的影响。

Abstract:

In order to study the mechanical properties of landscape decoration cable-stayed bridge without backstays, the finite element model of landscape bridge structure is established to calculate the reasonable cable force of cable-stayed bridge without backstays meeting the landscape effect. At the same time, combined with the structural characteristics of cable-stayed bridge without backstays, the stress, vertical deflection and structural dynamic response of each component of cable-stayed bridge without backstays under various load combinations are calculated. And the contribution of landscape cable to structural bearing capacity and elastic support is analyzed. The research shows that based on the reasonable cable force determination method proposed for landscape decoration cable-stayed bridges without backstays, the cable force that meets the landscape requirements can be obtained. At the same time, the calculation results show that landscape cables contribute less to the bearing capacity of the bridge structure. In the dynamic calculation of landscape decoration cable-stayed bridge without backstays, the landscape cable has a relatively small influence on the first and second order vibration modes of the structure and the mass direction in which the vibration modes participate. For the dynamic calculation of landscape decoration cable-stayed bridges without backstays that only focus on fundamental frequency indicators, the influence of landscape cable force can be disregarded.