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对美国最大跨度桁架桥中的主要桁架构件以及整个结构系统的可靠性进行评估。根据构件和系统的可靠性指标,可以采用随机方法评估大跨桥的安全水平。然而,大多数旧的大跨桥是基于允许应力设计的,其可靠性不可能被保证。本研究的可靠性分析基于对恒荷载、活荷载和风载分布的评估。通过收集大量的输入和响应数据,对大桥进行长期结构健康监测。根据外部荷载影响的模式和大小,长期监测数据清楚揭示了不同结构的性能。案例显示,采用传统的分析方法难以确定由于温度引起的结构响应。为探讨温度对结构的影响以及在可靠性评估中考虑长期监测数据的作用,也对温度引起的响应进行分析。研究显示:温度导致的响应对整个系统的可靠性具有明显的影响。
The reliability of the main truss members in the largest span truss bridge in the United States and the entire structural system is evaluated. Based on the reliability of components and systems, a random approach can be used to assess the safety level of a long-span bridge. However, most of the older long-span bridges are based on permissible stress designs and their reliability can not be guaranteed. The reliability analysis of this study is based on the assessment of the distribution of dead load, live load and wind load. Long-term structural health monitoring of the bridge by collecting a large amount of input and response data. Long-term monitoring data clearly reveal the performance of different structures, depending on the pattern and size of the external load impact. The case shows that it is difficult to determine the structural response due to temperature using traditional analytical methods. To investigate the effect of temperature on the structure and the role of long-term monitoring data in reliability assessment, the temperature-induced response was also analyzed. Research shows that temperature-induced responses have a significant impact on the overall system reliability.