Abstract
The investigation of concrete structural performance is crucial to maintain the stability of infrastructure. In order to assess structural stability, this work focuses on the development of an integrated framework to detect damaged conditions in the field and analyze their effect on mechanical performance through nondestructive testing (NDT) technology and numerical models. First, a ground penetrating radar (GPR) and an infrared camera work collaboratively to identify the damaged positions of the concrete structure, with parameters calibrated by laboratory experiments. Then, a finite element model is established to study structural mechanical performance based on field conditions and detected results. In addition, the influenced regions induced by local damage are studied under different boundary conditions. As a case study, the devised method was employed in the Nanjing Yangtze River tunnel for stability assessment and disaster prevention. The detected results of the damaged conditions agree well with the actual conditions in the field. Numerical results show that the circumferential stress component is more significant than that observed longitudinally. The effect of local damage on stress implies a positive correlation with the rise of water pressure, in which the maximum stress response to the variation of water level is 45KPa per meter.
Highlights
The construction of underground structures has developed rapidly in recent years and plays an important role in the development of the Chinese national economy [1]
According to the detection information obtained from nondestructive testing (NDT) results, numerical simulation is carried out to study the impact of local damage on structural mechanical performance
The purpose of this section is to develop the framework used to evaluate the stability of a concrete structure under the effect of local damage, combining the field detection data with numerical analysis
Summary
The construction of underground structures has developed rapidly in recent years and plays an important role in the development of the Chinese national economy [1]. According to the detection information obtained from NDT results, numerical simulation is carried out to study the impact of local damage on structural mechanical performance As it is one of the most important components of the framework, various numerical models have been developed in recent years. The combined application of field detection results with numerical simulation is of great significance to stability assessment, which has remained an underlying problem in previous studies [17]. Along this line, in the present study, a numerical model developed on the basis of finite element theory is applied to study the structural mechanical response to local damage. As an important application, the NDT and numerical results provide a significant reference to assess the stability of the case study
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