基于健康监测数据的简支梁桥钢筋锈蚀分析

Corrosion Analysis of Steel Bar of Simply Supported Beam Bridge Based on Health Monitoring Data

分析了基于不同传感器监测(应变、挠度和旋转)的不同损伤指标,提出了一种比较损伤指标性能的方法,并利用其数据实现了桥梁钢筋锈蚀先验估计的贝叶斯更新。分析案例研究中桥梁为钢筋混凝土简支梁,外荷载主要是交通荷载作用,并通过锈蚀模拟随时间变化的劣化。结果表明,在数据较少且不确定的情况下,桥梁劣化程度的估计结果可以得到较好的改善,特别是基于转角的损伤指标。

Different damage indexes monitored by different sensors(strain,deflection,and rotation)were analyzed,then a method for comparing the performance of damage indexes was proposed,and the obtained data realized the Bayesian updating of priori estimation of the bridge steel bar corrosion.In this case,the target bridge beam was simply supported reinforced concrete beam,the external load was mainly the traffic load,and the degradation with time was simulated by the corrosion.The results showed that,under the condition of less data and uncertainty,the estimation result of bridge deterioration could be better improved,particularly the damage index based on the rotation.