Infrastructures such as bridges are often susceptible to continuous cyclic loadings and exposed to structural vibration. The cumulative cyclic loads will lead the structures into fatigue condition and contribute to the deficient service life of structures. Hence, evaluating the current structural health condition through the structural stiffness quantification is important. This study examined performance characteristics of fatigued RC slabs using an integrated dynamic response technique and numerical simulations by finite element (FE) model and model updating. The measured experimental results were used to update and validate the FE model. The results pertaining to the dynamic characteristics and structural stiffness show there is an inherent relationship with the fatigue damage. As the cyclic load increased, structural stiffness and natural frequency were found to decrease. The effects of a sensitive parameter of the slab structures were parametrically investigated, and an empirical formula derived from the results was established for evaluating the structural stiffness. An assessment method based on vibration-based is proposed and was demonstrated to be capable of predicting serviceability of fatigued RC structure.

诸如桥梁之类的基础设施通常容易受到连续的周期性荷载，并容易受到结构振动的影响。累积的循环载荷将使结构进入疲劳状态，并导致结构使用寿命不足。因此，通过结构刚度量化评估当前的结构健康状况非常重要。本研究使用集成的动态响应技术并通过有限元（FE）模型和模型更新进行数值模拟，研究了疲劳钢筋混凝土平板的性能特征。测得的实验结果用于更新和验证有限元模型。有关动力特性和结构刚度的结果表明，其与疲劳损伤有着内在的关系。随着周期性负载的增加，发现结构刚度和固有频率降低。对平板结构敏感参数的影响进行了参数研究，并建立了从结果中得出的经验公式来评估结构刚度。提出了一种基于振动的评估方法，并证明了该方法能够预测疲劳RC结构的使用寿命。