墩梁固结处模拟方式对连续刚构桥动力特性的影响

发布时间：2019-05-15 17:54

【摘要】：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。
[Abstract]:There is a wide range of rigid domain at the consolidation of continuous rigid frame pier beam, and its simulation mode has a direct influence on the dynamic characteristics of continuous rigid frame bridge. Four different methods (common joint, master-slave constraint, rigid material, solid element) are used to analyze the influence of the simulation mode of pier beam consolidation on the dynamic characteristics of high pier and long span continuous rigid frame bridge. At the same time, the modal frequency and vibration mode of the actual bridge structure are tested by using the natural environment excitation technology and the joint feature system implementation algorithm (NExT/ERA method), and compared with the above four simulation methods. The results show that the modal parameters of the structure can be well identified by NExT/ERA method, and the dynamic characteristics of the bridge structure are greatly affected by different simulation methods, and the finite element model of the solid element is the most accurate. The rigid material method can also simulate the rigid domain of the pier and beam consolidation very well. For the structure with high pier and long span continuous rigid frame bridge, which has a wide range of rigid regions, it is necessary to accurately simulate the rigid domain in order to obtain the correct dynamic characteristics of the structure.
【作者单位】：重庆中设工程设计股份有限公司;重庆中检工程质量检测有限公司;长沙理工大学土木与建筑学院;
【基金】：国家自然科学基金(51378080) 科技部973计划项目(2015CB057702)
【分类号】：U441.3;U448.23

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