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本文将结构-气流作为一个系统处理,建立了桥梁三维颤振分析的状态空间法。这一方法,克服了以往理论的局限性,适用于各种复杂的桥梁结构与各种非均匀的风速场,不仅计算工作量较少,而且能够提供在整个亚临界区直至临界区结构动力特性随风速而变化的信息及其颤振形态。这一方法的建立,解决了各种复杂桥梁的颤振分析问题,对桥梁颤振特性与抗风设计方法的研究提供了有效的工具。
In this paper, the structure-airflow is treated as a system, and the state space method for three-dimensional flutter analysis of bridges is established. This method overcomes the limitations of previous theories and is applicable to all kinds of complex bridge structures and various non-uniform wind speed fields. It not only requires less computational workload, but also can provide structural dynamic characteristics throughout the subcritical region up to the critical region. Information that changes with wind speed and its flutter patterns. The establishment of this method solves the problem of flutter analysis for various complex bridges, and provides an effective tool for the study of bridge flutter characteristics and wind resistance design methods.