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Field stress/displacement monitoring and fatigue reliability assessment of retrofitted steel bridge details

机译：钢筋混凝土桥梁现场应力/位移监测和疲劳可靠性评估

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摘要

This paper presents the field stress and displacement measurements in controlled load tests and long-term monitoring to investigate the performance of two retrofitted details, which were used to alleviate the cracking problems of an existing steel bridge. Effectiveness of the retrofit schemes is demonstrated by comparing the displacements of the retrofitted details with those of the non-retrofitted ones. Based on the field monitored data and the AASHTO Specifications, time-dependent fatigue reliability assessment is made, in which S-N curves are used to consider the influence of variable amplitude loading on the propagation of initial defects and fatigue damage. Effective stress ranges are derived from daily stress range histograms, and lognormal probability density functions (PDFs) are used to model the uncertainties in the effective stress range with the aid of regression analyses. It is observed that stress ranges in the instrumented details are all below the corresponding constant amplitude fatigue limits. Consequently, high fatigue reliabilities of these retrofitted details are expected. However, the reliability indices decrease significantly as time goes on, and this deterioration process may be accelerated with the increase in traffic volume. The analysis results provide references to bridges with similar fatigue cracking problems.
机译：本文介绍了在受控负载测试和长期监控中的场应力和位移测量，以研究两个改装细节的性能，这些细节用于缓解现有钢桥的开裂问题。通过将改装零件的位移与未改装零件的位移进行比较，可以证明改装方案的有效性。基于现场监测数据和AASHTO规范，进行了时变疲劳可靠性评估，其中使用S-N曲线来考虑可变振幅载荷对初始缺陷和疲劳损伤的传播的影响。有效应力范围是从每日应力范围直方图中得出的，对数正态概率密度函数（PDF）用于借助回归分析对有效应力范围内的不确定性进行建模。可以看出，仪器细节中的应力范围都在相应的恒定振幅疲劳极限以下。因此，这些改装零件的疲劳可靠性很高。但是，随着时间的流逝，可靠性指标会大大降低，并且随着流量的增加，这种恶化过程可能会加速。分析结果为具有类似疲劳裂纹问题的桥梁提供了参考。

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