连续刚构桥墩梁固结处存在一个较大范围的刚域,其模拟方式对连续刚构桥动力特性有直接影响.拟采用4种(共节点、主从约束、刚性材料、实体单元)不同方式,来分析墩梁固结处的模拟方式对高墩大跨径连续刚构桥动力特性的影响,同时运用自然环境激励技术联合特征系统实现算法(NExT/ERA法),测试出实际桥梁结构的模态频率与振型,并与上述4种模拟方式比较.结果表明,采用NExT/ERA法能很好地识别出结构的模态参数,不同模拟方式对桥梁结构的动力特性有较大影响,实体单元有限元模型最为精确,刚性材料法也能够很好地模拟墩梁固结处的刚域,对高墩大跨径连续刚构桥这种存在较大范围刚域的结构必须要对刚域准确模拟才能够得出结构正确的动力特性.%Continuous rigid frame bridge has a wide rigid zone range at the joint between piers and girder, the simulation of rigid zone will influence the dynamic characteristics directly.Firstly, 4 different kinds (common nodes, master-slave constraint, rigid material, and solid elements) joint between piers and girder are simulated to study the influence on dynamic characteristics of continuous rigid frame bridge, then, it uses NExT/ERA method to test out the bridge modal frequencies and mode shapes, finally, the measured dynamic characteristics are contrasted to the above-described 4 kinds simulation.The results show that using NExT/ERA method can identify the modal parameters well, different simulation of rigid zone has comparatively large influence on the dynamic properties of the bridge, the solid element finite element model is the most accurate, the rigid material method can also simulate rigid zone at the joint between piers and girder very well, and the rigid zone has to be simulate accurately to obtain correct dynamic characteristics like the high pier continuous rigid frame bridge, which has a wide rigid zone range at the joint between piers and girder.
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