考虑主塔刚度影响的非对称悬索桥竖弯频率估算公式

发布时间：2018-06-03 11:55

本文选题：桥梁工程 + 悬索桥　；参考：《土木建筑与环境工程》2017年06期

【摘要】：为方便计算双塔两跨连续体系非对称悬索桥的竖向自振频率,在考虑主塔刚度的影响下,应用Rayleigh法,推导其1阶竖弯振动频率近似表达式,并提出了主塔刚度影响系数的表达式,最后对此公式的可行性进行了算例验证。结果表明,主塔刚度对该结构体系的一阶对称竖弯频率有影响,而对一阶反对称竖弯频率没有影响;可通过主塔刚度影响系数进行计算主塔刚度对一阶对称竖向弯曲基频的影响程度;解与有限元解之间的误差范围在初步概念设计阶段所允许的要求之内;所推导的基频近似表达式可用于双塔两跨连续体系非对称悬索桥动力特性估算。
[Abstract]:In order to calculate the vertical natural vibration frequency of the asymmetric suspension bridge with two towers and two spans, considering the influence of the stiffness of the main tower, the Rayleigh method is used to derive the approximate expression of the first order vertical bending vibration frequency. The expression of the influence coefficient of the stiffness of the main tower is put forward, and the feasibility of the formula is verified by an example. The results show that the stiffness of the main tower has an effect on the first-order symmetrical vertical bending frequency of the structure system, but has no effect on the first-order anti-symmetric vertical bending frequency. The influence of the stiffness of the main tower on the fundamental frequency of the first order symmetrical vertical bending can be calculated by the influence coefficient of the stiffness of the main tower, and the error range between the solution and the finite element solution is within the allowable requirement of the preliminary conceptual design stage. The derived approximate expression of fundamental frequency can be used to estimate the dynamic characteristics of asymmetric suspension bridges with two towers and two spans.
【作者单位】：商洛学院建工学院;山东交通学院;
【基金】：国家自然科学基金(50908017) 中央高校基本科研业务费专项资金(201493212002)~~
【分类号】：U448.25

【相似文献】