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The concrete health monitoring is a significant part of concrete structure construction. As an important non-destructive inspection instrument, geological radar is widely used in tunnel engineering because of the characteristics of simple operating, high resolution and visualized drawing. This paper which takes Yang Jiaba Tunnel in Lan-Yu Railway for an example provides good experience in quality...
High-Fidelity Model of the sandwich composite structure with real geometry is reported. The model includes two composite facesheets, honeycomb core, piezoelectric actuator/sensors, adhesive layers, and the impactor. The novel feature of the model is that it includes modeling of the impact and wave propagation in the structure before and after the impact. Results of modeling of the wave propagation,...
The optimal placement method of sensors is carried out based on improved genetic algorithm for solving the sensors optimal placement problem of the health monitoring system for long-span railway bridge. Dual structure coding method is introduced to improve the individual encoding method in the Genetic Algorithm. Adaptive partial matching crossover and inversus mutation method is adopted in the optimal...
Piezoelectric lead zirconate titanate (PZT) transducer in the electromechanical impedance (EMI) technique has emerged as a potential sensing tool for structural health monitoring. In the EMI technique, PZT acts as both sensor and actuator simultaneously due to its direct and inverse piezoelectric effects. The EMI method using PZT transducers provide a new way for in-situ nondestructive testing of...
Damage detection is an extremely important engineering problem. A signal processing method for detecting structural frequency is applied to two moment frames building. This method is based on changes in the seismic vibration response using Hilbert-Huang transform. A comparison between time and magnitude of drops in system frequency and damage is presented. This method is suitable for damage detection...
In order to solve the problem about structure health monitoring system construction of rigid frame-continuous beam bridge, taking Jin Shui Gou Bridge as the study object, the health monitoring system of rigid frame-continuous beam bridge was studied, and the selection basis of project for health monitoring system was proposed in this paper. The health monitoring system of Jin Shui Gou Bridge was analyzed,...
Damage diagnosis and health monitoring of large-scale structures are becoming a hot research subject in the present structural engineering circle. Elman neural network is presented to identify and locate the crack damage of a radial gate located in the middle reaches of the main stream of the Jialing River. This method is an aggregation neural networks and pattern identification. And also make the...
The Cutty Sark is undergoing major conservation to slow down the deterioration of the original Victorian fabric of the ship. While the conservation work being carried out is ??state of the art??, there is no evidence at present of the effectiveness of the conservation work 50 plus years ahead. A prognostics framework is being developed to monitor the ??health?? of the ship's iron structures to help...
Acoustic emission (AE) technology is a powerful tool for researching the intrinsic essence of materials and an effective method for Non Destructive Testing and Health Monitoring. Until this time, AE technique has been applying in many fields, e.g., aircraft structure, offshore platform, pressure equipment, rock, dam, concrete, steel, etc.AE technique was applied into civil engineering later compared...
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