自锚式独塔悬索桥竖向弯曲振动基频估算公式

Estimation Formula of Vertical Bending Vibration Fundamental Frequency of Self-anchored Single Tower Suspension Bridge

为方便计算自锚式独塔悬索桥的竖向自振频率,以塔梁支承体系的独塔自锚式悬索桥为研究对象,采用能量法,推导了该体系的竖向弯曲振动频率公式,最后对此公式可行性进行了算例验证。研究结果表明:文中所推导解析解的竖弯基频计算值与文献解之间的误差能满足初步设计阶段要求;该公式可用于该体系在初步概念设计中选择合理的结构计算参数。

In order to calculate the vertical natural frequencies of self-anchored single tower suspension bridge conveniently,the self-anchored single tower suspension bridge with tower-beam support system was taken as the research object.The formula of the vertical bending vibration frequency of the system was deduced by the energy method.Finally,the feasibility of the proposed formula was verified by the case study.The results indicate that the errors between the calculated values of vertical bending fundamental frequencies of the proposed analytical solutions and those of the literature can meet the requirements of the preliminary design stage,and the proposed formula can be used to select reasonable structural calculation parameters in the preliminary conceptual design of the system.