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中文摘要：
基于ANSYS软件建立了润扬长江公路大桥南汉悬索桥的三维有限元计算模型，并采用子空间迭代法对其进行了自振特性分析，研究了刚性中央扣的多精度模拟技术及其对大跨度悬索桥动力特性的影响。研究结果表明，中央扣的不同精度模拟对该桥动力特性的影响很小；与跨中短吊索相比，中央扣的设置使得结构刚度有所增加，相应的各阶频率增大，但各类振型受影响的程度不同，其中以缆索振动为主的频率增加最为明显。研究结果为该桥的健康监测提供了必要的信息和研究基础。
英文摘要：
A 3-D finite element model for Runyang Yangtze Highway Nancha Suspension Bridge was established with ANSYS software, on the basis of which self-vibration behavior analysis was carried out using subspace iteration method. The central buckle and influence of the central buckle on bridge were particularly studied. Results show that multi-accuracy simulation technique of the dynamic behavior of the long span suspension different accuracy simulation of central buckle has a little influence on dynamic behavior of the bridge; compared with short hanger cable at midspan, the structural rigidity is raised and the natural frequencies increase by use of central buckle, but various types of vibration modes are affected in different extents; among all of these vibration modes, the cable related modes are most obviously affected. The results obtained in this paper provide essential information and research basis for health monitoring of the bridge.
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