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为方便计算高墩固结体系矮塔斜拉桥的纵飘基频,基于三跨高墩固结体系矮塔斜拉桥,应用Rayleigh法,推导其纵飘基频公式,并提出了名义单位质量的抗弯刚度的概念,最后对此公式的可行性进行了算例验证,并讨论了该公式的应用对象.研究表明:高墩固结体系的矮塔斜拉桥第一阶振动以桥墩的纵飘为主,给出的能量法得到的纵飘基频计算值与有限元值误差能满足概念设计阶段的要求,该公式适用于高墩固结体系矮塔斜拉桥的纵飘基频估算.
In order to facilitate the calculation of the longitudinal frequency of the CFRD for the low pylon cable-stayed bridge with high pier consolidation system, based on the low-span cable-stayed bridge with the three-span high pier consolidation system, Rayleigh method was used to derive its fundamental fundamental frequency formula The concept of the bending stiffness of the high-rise piers, the concept of the flexural rigidity of the high-rise piers, and the feasibility of this formula are finally validated and the object of the formula is discussed. The results show that the first- . The results show that the calculated value of longitudinal frequency and the finite element value error obtained by the energy method can meet the requirement of conceptual design stage. The formula is suitable for the longitudinal displacement of the long-span cable-stayed bridge with high pier consolidation system Frequency estimation.