Nondestructive monitoring systems currently applied to evaluate existing bridges. This study aims to assess the service life of YangHwa steel bridge, Seoul, Korea, using short period nondestructive structural health monitoring system due to static and moving trucks effects. Different static and dynamic loads were carried out to evaluate the bridge behavior though change trucks’ positions and speeds. The reliability index, neutral axis position, curvatures modal, and frequency and dynamic factor changes are extracted and evaluated. A novel similarity index is investigated, and the analysis of wavelet spectrum is applied to evaluate the bridge behavior. The results show that the bridge is safe using different indices, such as reliability, neutral axis, similarity performance, and curvature modal, dynamic factor and frequency changes. All these indices values are reported to be lower than the standard American Association of State Highway Officials (AASHTO) values and previous inspections, and no abnormal conditions are observed. The similarity index and wavelet spectrum analysis are found to be useful tools to estimate the similarity performance and to estimate the dominant frequency change of the bridge, respectively.

当前用于评估现有桥梁的无损监测系统。这项研究旨在评估由于使用静态和动态卡车影响而使用的短期非破坏性结构健康监测系统，以评估韩国首尔YangHwa钢桥的使用寿命。通过改变卡车的位置和速度，进行了不同的静态和动态载荷以评估桥梁性能。提取并评估可靠性指标，中性轴位置，曲率模态以及频率和动态因子变化。研究了一种新的相似性指标，并将小波谱分析用于评估桥梁行为。结果表明，该桥使用可靠度，中性轴，相似性能以及曲率模态，动态系数和频率变化等不同指标是安全的。据报道，所有这些指数值均低于标准的美国州公路官员协会（AASHTO）值和先前的检查，并且未观察到异常情况。发现相似度指数和小波频谱分析分别是评估相似度性能和评估桥梁主导频率变化的有用工具。