【摘要】 为研究环境激励下针对混凝土桥梁结构动力特性的识别问题,将现有的时域分析方法进行改进。利用自然激励技术与特征系统实现算法相结合,模拟风载激励对一预应力混凝土连续梁桥进行动力特性识别的有限元仿真模拟分析。利用随机减量技术和Ibrahim时域联合算法和有限元模态分析进行结果对比验证。仿真模拟结果表明,基于最常见的环境激励———风载激励识别混凝土梁桥的动力特性参数是行之有效的。运用自然激励技术与特征系统实现算法相结合的时域分析方法识别结果较为准确,为此类结构的健康监测和结构设计提供了有效支持。更多还原

【Abstract】 The traditional time-domain analysis method was improved to study the dynamic behavior identification of the concrete bridge structure under environmental excitation.Applying the combination of the natural excitation technique and the eigensystem realization algorithm,a finite element numerical simulation was performed for the dynamic behavior identification of a pre-stressed concrete continuous beam bridge under simulating wind load excitation.The results were validated comparatively using the combined algorithm of random decrement technique and Ibrahim time domain technique as well as the finite element modal analysis.The simulation results show that the wind load as the most common environmental excitation can be used effectively to identify the modal parameters of the concrete bridge.The results identified by the combination of the natural excitation technique and the eigensystem realization algorithm are pricise enough for the concrete bridge,providing an effective support for the structure health monitoring and structure design.更多还原