• Title, Summary, Keyword: structural health monitoring

Search Result 892, Processing Time 0.056 seconds

Application of structural health monitoring in civil infrastructure

  • Feng, M.Q.
    • Smart Structures and Systems
    • /
    • v.5 no.4
    • /
    • pp.469-482
    • /
    • 2009
  • The emerging sensor-based structural health monitoring (SHM) technology has a potential for cost-effective maintenance of aging civil infrastructure systems. The author proposes to integrate continuous and global monitoring using on-structure sensors with targeted local non-destructive evaluation (NDE). Significant technical challenges arise, however, from the lack of cost-effective sensors for monitoring spatially large structures, as well as reliable methods for interpreting sensor data into structural health conditions. This paper reviews recent efforts and advances made in addressing these challenges, with example sensor hardware and health monitoring software developed in the author's research center. The hardware includes a novel fiber optic accelerometer, a vision-based displacement sensor, a distributed strain sensor, and a microwave imaging NDE device. The health monitoring software includes a number of system identification methods such as the neural networks, extended Kalman filter, and nonlinear damping identificaiton based on structural dynamic response measurement. These methods have been experimentally validated through seismic shaking table tests of a realistic bridge model and tested in a number of instrumented bridges and buildings.

Instrumentation on structural health monitoring systems to real world structures

  • Teng, Jun;Lu, Wei;Wen, Runfa;Zhang, Ting
    • Smart Structures and Systems
    • /
    • v.15 no.1
    • /
    • pp.151-167
    • /
    • 2015
  • Instrumentation on structural health monitoring system imposes critical issues for applying the structural monitoring system to real world structures, for which not only on the configuration and geometry, but also aesthetics on the system to be monitored should be considered. To illustrate this point, two real world structural health monitoring systems, the structural health monitoring system of Shenzhen Vanke Center and the structural health monitoring system of Shenzhen Bay Stadium in China, are presented in the paper. The instrumentation on structural health monitoring systems of real world structures is addressed by providing the description of the structure, the purpose of the structural health monitoring system implementation, as well as details of the system integration including the installations on the sensors and acquisition equipment and so on. In addition, an intelligent algorithm on stress identification using measurements from multi-region is presented in the paper. The stress identification method is deployed using the fuzzy pattern recognition and Dempster-Shafer evidence theory, where the measurements of limited strain sensors arranged on structure are the input data of the method. As results, at the critical parts of the structure, the stress distribution evaluated from the measurements has shown close correlation to the numerical simulation results on the steel roof of the Beijing National Aquatics Center in China. The research work in this paper can provide a reference for the design and implementation of both real world structural health monitoring systems and intelligent algorithm to identify stress distribution effectively.

Preliminary Design of Structural Health Monitoring for High-Rise Buildings

  • Ryu, Hyun-hee;Kim, Jong-soo;Choi, Eun-gyu;Lee, Sang-hoon
    • International Journal of High-Rise Buildings
    • /
    • v.6 no.3
    • /
    • pp.279-284
    • /
    • 2017
  • The purpose of structural health monitoring is to evaluate structural behavior due to various external loads through installation of appropriate measurement. Accordingly, a guideline for monitoring standards is necessary to evaluate the safety and performance of a structure. This paper introduces preliminary design of SHM for high-rise buildings, which is the stage creating a guideline. As for preliminary design of SHM, first step is to calculate the displacement and member force through structural analysis. After that, limitations or qualifications are proposed for management. Secondly, based on the results from first step, issues related monitoring such as monitoring method, measurement type, or installation location are determined. This method leads building managers to reasonably define the structural safety over the whole life cycle. Furthermore, this experience contributes to development of SHM forward and it is expected to be useful for other types of structures as well such as spatial structures or irregular buildings.

Structural Health Monitoring of Shanghai Tower Considering Time-dependent Effects

  • Zhang, Qilin;Yang, Bin;Liu, Tao;Li, Han;Lv, Jia
    • International Journal of High-Rise Buildings
    • /
    • v.4 no.1
    • /
    • pp.39-44
    • /
    • 2015
  • This paper presents the structural health monitoring (SHM) of Shanghai Tower. In order to provide useful information for safety evaluation and regular maintenance under construction and in-service condition, a comprehensive structural health monitoring (SHM) system is installed in Shanghai Tower, which is composed of a main monitoring station and eleven substations. Structural responses at different construction stages are measured using this SHM system and presented in this study. Meanwhile, a detailed finite element model (FEM) is created and comparison of results between SHM and FEM is carried out. Results indicate that the time-dependent property of concrete creep is of great importance to structural response and the measured data can be used in FEM updating to obtain more accurate FEM models at different construction stages. Therefore, installation of structural health monitoring system in super-tall buildings could be considered as an effective way to assure structural safety during the construction process.

Structural health monitoring system for Sutong Cable-stayed Bridge

  • Wang, Hao;Tao, Tianyou;Li, Aiqun;Zhang, Yufeng
    • Smart Structures and Systems
    • /
    • v.18 no.2
    • /
    • pp.317-334
    • /
    • 2016
  • Structural Health Monitoring System (SHMS) works as an efficient platform for monitoring the health status and performance deterioration of engineering structures during long-term service periods. The objective of its installation is to provide reasonable suggestions for structural maintenance and management, and therefore ensure the structural safety based on the information extracted from the real-time measured data. In this paper, the SHMS implemented on a world-famous kilometer-level cable-stayed bridge, named as Sutong Cable-stayed Bridge (SCB), is introduced in detail. The composition and core functions of the SHMS on SCB are elaborately presented. The system consists of four main subsystems including sensory subsystem, data acquisition and transmission subsystem, data management and control subsystem and structural health evaluation subsystem. All of the four parts are decomposed to separately describe their own constitutions and connected to illustrate the systematic functions. Accordingly, the main techniques and strategies adopted in the SHMS establishment are presented and some extension researches based on structural health monitoring are discussed. The introduction of the SHMS on SCB is expected to provide references for the establishment of SHMSs on long-span bridges with similar features as well as the implementation of potential researches based on structural health monitoring.

Structural monitoring and identification of civil infrastructure in the United States

  • Nagarajaiah, Satish;Erazo, Kalil
    • Structural Monitoring and Maintenance
    • /
    • v.3 no.1
    • /
    • pp.51-69
    • /
    • 2016
  • Monitoring the performance and estimating the remaining useful life of aging civil infrastructure in the United States has been identified as a major objective in the civil engineering community. Structural health monitoring has emerged as a central tool to fulfill this objective. This paper presents a review of the major structural monitoring programs that have been recently implemented in the United States, focusing on the integrity and performance assessment of large-scale structural systems. Applications where response data from a monitoring program have been used to detect and correct structural deficiencies are highlighted. These applications include (but are not limited to): i) Post-earthquake damage assessment of buildings and bridges; ii) Monitoring of cables vibration in cable-stayed bridges; iii) Evaluation of the effectiveness of technologies for retrofit and seismic protection, such as base isolation systems; and iv) Structural damage assessment of bridges after impact loads resulting from ship collisions. These and many other applications show that a structural health monitoring program is a powerful tool for structural damage and condition assessment, that can be used as part of a comprehensive decision-making process about possible actions that can be undertaken in a large-scale civil infrastructure system after potentially damaging events.

A versatile software architecture for civil structure monitoring with wireless sensor networks

  • Flouri, Kallirroi;Saukh, Olga;Sauter, Robert;Jalsan, Khash Erdene;Bischoff, Reinhard;Meyer, Jonas;Feltrin, Glauco
    • Smart Structures and Systems
    • /
    • v.10 no.3
    • /
    • pp.209-228
    • /
    • 2012
  • Structural health monitoring with wireless sensor networks has received much attention in recent years due to the ease of sensor installation and low deployment and maintenance costs. However, sensor network technology needs to solve numerous challenges in order to substitute conventional systems: large amounts of data, remote configuration of measurement parameters, on-site calibration of sensors and robust networking functionality for long-term deployments. We present a structural health monitoring network that addresses these challenges and is used in several deployments for monitoring of bridges and buildings. Our system supports a diverse set of sensors, a library of highly optimized processing algorithms and a lightweight solution to support a wide range of network runtime configurations. This allows flexible partitioning of the application between the sensor network and the backend software. We present an analysis of this partitioning and evaluate the performance of our system in three experimental network deployments on civil structures.

Vibration-based Structural Health Monitoring of Caisson-type Breakwaters Damaged on Rubble Mound (사석마운드가 손상된 케이슨식 방파제의 진동기반 구조건전성 모니터링)

  • Lee, So-Young;Kim, Jeong-Tae;Kim, Heon-Tae
    • Journal of Ocean Engineering and Technology
    • /
    • v.24 no.1
    • /
    • pp.90-98
    • /
    • 2010
  • In this paper, vibration-based structural health monitoring methods that are suitable for caisson-type structures are examined by an experimental evaluation. To achieve the objective, four approaches are implemented. First, vibration-based structural health monitoring methods are selected to monitor the structural condition of caisson-type breakwaters. Second, a lab-scaled caisson structure is constructed to verify the selected monitoring methods. Third, the vibration characteristics are numerically analyzed using an FE model due to the change in the rubble mound condition. Finally, experimental vibration tests of the lab-scaled caisson structure are performed to monitor the vibration responses due to changes in rubble mound conditions and the performances of the selected methods are examined from the monitoring results.

Low Attenuation Waveguide for Structural Health Monitoring with Leaky Surface Waves

  • Bezdek, M.;Joseph, K.;Tittmann, B.R.
    • Journal of the Korean Society for Nondestructive Testing
    • /
    • v.32 no.3
    • /
    • pp.241-262
    • /
    • 2012
  • Some applications require structural health monitoring in inaccessible components. This paper presents a technique useful for Structural Health Monitoring of double wall structures, such as double wall steam pipes and double wall pressure vessels separated from an ultrasonic transducer by three layers. Detection has been demonstrated at distances in excess of one meter for a fixed transducer. The case presented here is for one of the layers, the middle layer, being a fluid. For certain transducer configurations the wave propagating in the fluid is a wave with low velocity and attenuation. The paper presents a model based on wave theory and finite element simulation; the experimental set-up and observations, and comparison between theory and experiment. The results provide a description of the technique, understanding of the phenomenon and its possible applications in Structural Health Monitoring.

Structural Health Monitoring of short to medium span bridges in the United Kingdom

  • Brownjohn, James M.W.;Kripakaran, Prakash;Harvey, Bill;Kromanis, Rolands;Jones, Peter;Huseynov, Farhad
    • Structural Monitoring and Maintenance
    • /
    • v.3 no.3
    • /
    • pp.259-276
    • /
    • 2016
  • Historically the UK has been a pioneer and early adopter of experimental investigation techniques on new and operation structures, a technology that would now be descried as 'structural health monitoring' (SHM), yet few of these investigations have been enduring or carried out on the long span or tall structures that feature in flagship SHM applications in the Far East.