• Title/Summary/Keyword: Bridge Aging

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The Real-time Health Monitoring System of a Cable-stayed Bridge Based on Non-destruction Measurement (비파괴계측에 의한 사장교의 공용간 상시안전감시시스템)

  • Choi, Man-Yong;Kang, Kyung-Koo;Kim, Jong-Woo
    • Journal of the Korean Society for Nondestructive Testing
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    • v.22 no.3
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    • pp.239-245
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    • 2002
  • Many civil and infrastructures continue to be used despite aging and the associated potential for damage accumulation. Therefore, the ability to monitor the health of these systems is becoming increasingly important. The purpose of this paper is to propose a real-time health monitoring system of cable-stayed bridge, based-on non-destructive measurement. And also this paper focuses on the safety assessment for bridge from health monitoring system to accomplish this safety assesment. Using the proposed health monitoring system, it helps bridge maintenance and reduces the economic cost of a life-cycle costs. Also it give important data to develop the design and analysis method for cable-stayed bridges.

Structural Behavior and Distress of Asphalt Pavement on Concrete Bridge Decks (콘크리트 교면 아스팔트포장의 구조적 거동 및 파손)

  • Park, Seong-Wan;Lee, Hyun-Jong;Lee, Wan-Hoon
    • International Journal of Highway Engineering
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    • v.6 no.1 s.19
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    • pp.13-23
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    • 2004
  • This paper presents the results of a study that was performed to evaluate structural behaviors and related distress of asphalt pavements on concrete bridge deck based on the visual inspection and 3-dimensional finite element analysis. As a result, three most failure types were found such as permanent deformation, potholes, and fatigue crackings. In addition, the failure mechanisms of different types of concrete bridge deck were investigated. An increase in fatigue of asphalt pavements on concrete bridge deck was observed and confirmed by the results from the visual inspections. In consequence, the aging and stripping of asphalt surfacing materials are relatively dominant factors on fatigue rather than traffic loadings.

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Partial-interaction fatigue assessment of stud shear connectors in composite bridge beams

  • Seracino, Rudolf;Oehlers, Deric J.;Yeo, Michael F.
    • Structural Engineering and Mechanics
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    • v.13 no.4
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    • pp.455-464
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    • 2002
  • There is a growing demand to assess the remaining strength and endurance of existing composite steel and concrete bridge beams due to the aging infrastructure, increases in permissible vehicle weights and increases in their frequencies. As codes are generally dedicated to the design of new structures, new procedures are required to aid in the assessment of existing bridges to ensure that they are utilised to the full. In this paper, simple expressions are presented to perform partial-interaction analyses directly from full-interaction analyses, so that the beneficial effect of partial-interaction on the shear forces on the shear connectors can be utilised in assessment to extend the fatigue life of simply supported bridge beams and to determine the effect of remedial work if necessary. Use of the assessment technique is described by way of an illustrative example.

A Study on Fatigue Performance Evaluation of Stress Concentration of Plate Members Using Composite Material (복합재료 사용 바닥판 부재의 응력집중부에 대한 피로성능 평가에 관한 연구)

  • Park, Tai-Young;Park, Joon-Seok;Kim, Doo-Hwan
    • 한국방재학회:학술대회논문집
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    • 2008.02a
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    • pp.529-532
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    • 2008
  • Recently the compound material has interested in using the structural material as the bridge member assembly. It is the lighter material against existing construction material and has excellent durability and economy. The existing floor of bridge has its short period to repair and replace compared to other parts of the bridge with the pavement and the shoe. These deteriorations of usage and safety by aging and corrosion are needed frequent maintenance. The use of compound material as a structural member suggests solve these problems. So this thesis evaluates the static and the fatigue performance for whether there are fiber lamination direction and stress concentration section of FRP floor plate, the compound material.

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Development and testing of a composite system for bridge health monitoring utilising computer vision and deep learning

  • Lydon, Darragh;Taylor, S.E.;Lydon, Myra;Martinez del Rincon, Jesus;Hester, David
    • Smart Structures and Systems
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    • v.24 no.6
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    • pp.723-732
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    • 2019
  • Globally road transport networks are subjected to continuous levels of stress from increasing loading and environmental effects. As the most popular mean of transport in the UK the condition of this civil infrastructure is a key indicator of economic growth and productivity. Structural Health Monitoring (SHM) systems can provide a valuable insight to the true condition of our aging infrastructure. In particular, monitoring of the displacement of a bridge structure under live loading can provide an accurate descriptor of bridge condition. In the past B-WIM systems have been used to collect traffic data and hence provide an indicator of bridge condition, however the use of such systems can be restricted by bridge type, assess issues and cost limitations. This research provides a non-contact low cost AI based solution for vehicle classification and associated bridge displacement using computer vision methods. Convolutional neural networks (CNNs) have been adapted to develop the QUBYOLO vehicle classification method from recorded traffic images. This vehicle classification was then accurately related to the corresponding bridge response obtained under live loading using non-contact methods. The successful identification of multiple vehicle types during field testing has shown that QUBYOLO is suitable for the fine-grained vehicle classification required to identify applied load to a bridge structure. The process of displacement analysis and vehicle classification for the purposes of load identification which was used in this research adds to the body of knowledge on the monitoring of existing bridge structures, particularly long span bridges, and establishes the significant potential of computer vision and Deep Learning to provide dependable results on the real response of our infrastructure to existing and potential increased loading.

Determination of structural behavior of Bosporus suspension bridge considering construction stages and different soil conditions

  • Gunaydin, Murat;Adanur, Suleyman;Altunisik, Ahmet Can;Sevim, Baris;Turker, Emel
    • Steel and Composite Structures
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    • v.17 no.4
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    • pp.405-429
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    • 2014
  • In this paper, it is aimed to determine the structural behavior of suspension bridges considering construction stages and different soil conditions. Bosporus Suspension Bridge connecting the Europe and Asia in Istanbul is selected as an example. Finite element model of the bridge is constituted using SAP2000 program considering existing drawings. Geometric nonlinearities are taken into consideration in the analysis using P-Delta large displacement criterion. The time dependent material strength of steel and concrete and geometric variations is included in the analysis. Time dependent material properties are considered as compressive strength, aging, shrinkage and creep for concrete, and relaxation for steel. To emphases the soil condition effect on the structural behavior of suspension bridges, each of hard, medium and soft soils are considered in the analysis. The structural behavior of the bridge at different construction stages and different soil conditions has been examined. Two different finite element analyses with and without construction stages are carried out and results are compared with each other. At the end of the analyses, variation of the displacement and internal forces such as bending moment, axial forces and shear forces for bridge deck and towers are given in detail. Also, displacement and stresses for bridge foundation are given with detail. It can be seen from the analyses that there are some differences between both analyses (with and without construction stages) and the results obtained from the construction stages are bigger. It can be stated that the analysis without construction stages cannot give the reliable solutions. In addition, soil condition have effect on the structural behavior of the bridge. So, it is thought that construction stage analysis using time dependent material properties, geometric nonlinearity and soil conditions effects should be considered in order to obtain more realistic structural behavior of suspension bridges.

A Study on the Application Technique of Realtime Bridge Monitoring System based on GNSS (GNSS 기반의 실시간 교량변위 모니터링 시스템 적용기술 연구)

  • Yeon, Sang-Ho
    • The Journal of the Korea Contents Association
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    • v.16 no.1
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    • pp.362-369
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    • 2016
  • Recently, Last to check the security status of various medium and large bridge structures using various kinds of measurement equipment, but most of the methods are used to measure and check the displacement behavior of the bridge by a certain period. In this study, receive GPS satellite signals that can be observed in real time the whole region, a bridge to automatically measure the displacement and behavior characteristics of the structure in real-time in mm over the 24 hours, the measurement information and transmits the data to the wireless network, by making use, it was applied to the real-time monitoring system in connection with a bridge to be able to automatically notify GNSS fine displacement behavior. In fact, analysis and receives the measurement data to GNSS provided in the upper bridge of the middle and large-sized aging for this purpose, measuring USN and at the same time is converted into a three-dimensional position information of a test study was conducted to monitor the bridge displacement in real time. As a result, a vertical displacement of about 0.027~0.037m at the measurement time of day of the measurement point is that the repeated and confirmed.

A Study on the Estimation of Probabilistic Repair.Reinforcement Cycles from Rating Curve of Steel Girder Bridges (강재 교량의 노후화에 따른 확률적 보수.보강 주기 추정에 관한 연구)

  • Kim, Hyun-Bae;Kim, Yong-Su
    • Korean Journal of Construction Engineering and Management
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    • v.10 no.2
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    • pp.102-110
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    • 2009
  • The cost for maintenance of bridge structures such as repair or reinforcement is increasing. In addition, the efforts for inspection of bridge structures is becoming more important since the proper repair or reinforcement should be performed to save the maintenance cost and ensure the safety for public infrastructure. Therefore, it is studied on this paper to estimate the repair or reinforcement cycles using probabilistic approach for the steel-box girders of bridge superstructure. In addition, a computer simulation program is uniquely developed based on probabilistic approach to calculate the cycles derived from the function of age of bridge and performance rating curve which were previously studied. In order to ensure the reliability of results and appropriateness of the model, statistical analyses were performed. Also, the results were compared and proved to be similar with ones from previous statistical data related to the repair or reinforcement cycles. The results from this study is expected to be useful for the determination of proper time to repair or reinforce the bridge structure and raise the safetyness of bridge structure in advance.

Structural evaluation of all-GFRP cable-stayed footbridge after 20 years of service life

  • Gorski, Piotr;Stankiewicz, Beata;Tatara, Marcin
    • Steel and Composite Structures
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    • v.29 no.4
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    • pp.527-544
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    • 2018
  • The paper presents the study on a change in modal parameters and structural stiffness of cable-stayed Fiberline Bridge made entirely of Glass Fiber Reinforced Polymer (GFRP) composite used for 20 years in the fjord area of Kolding, Denmark. Due to this specific location the bridge structure was subjected to natural aging in harsh environmental conditions. The flexural properties of the pultruded GFRP profiles acquired from the analyzed footbridge in 1997 and 2012 were determined through three-point bending tests. It was found that the Young's modulus increased by approximately 9%. Moreover, the influence of the temperature on the storage and loss modulus of GFRP material acquired from the Fiberline Bridge was studied by the dynamic mechanical analysis. The good thermal stability in potential real temperatures was found. The natural vibration frequencies and mode shapes of the bridge for its original state were evaluated through the application of the Finite Element (FE) method. The initial FE model was created using the real geometrical and material data obtained from both the design data and flexural test results performed in 1997 for the intact composite GFRP material. Full scale experimental investigations of the free-decay response under human jumping for the experimental state were carried out applying accelerometers. Seven natural frequencies, corresponding mode shapes and damping ratios were identified. The numerical and experimental results were compared. Based on the difference in the fundamental natural frequency it was again confirmed that the structural stiffness of the bridge increased by about 9% after 20 years of service life. Data collected from this study were used to validate the assumed FE model. It can be concluded that the updated FE model accurately reproduces the dynamic behavior of the bridge and can be used as a proper baseline model for the long-term monitoring to evaluate the overall structural response under service loads. The obtained results provided a relevant data for the structural health monitoring of all-GFRP bridge.

Research on the CBI, senior technology entrepreneurship promotion - Based on Finland Bridge Program- (시니어 기술창업을 위한 CBI 추진방안 연구 - 핀란드 브릿지 프로그램 기반을 중심으로 -)

  • Yoo, Soonduck;Choi, Kwangdon
    • Journal of Digital Convergence
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    • v.13 no.1
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    • pp.1-10
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    • 2015
  • This paper discusses entrepreneurship as a mean to overcome problems that arise from economic growth with no job growth and with aging population. In particular, this paper focuses on senior (elderly) entrepreneurship based on technology. It examines and defines restraints of various public and private sponsor programs for senior entrepreneurship. In comparison, Bridge Program of Finland was studied and its success factors are presented. Some of these success factors are enterprise-driven program operation, diverse education program focused on successful senior entrepreneurship, providing networking opportunities among entrepreneurs, and increased awareness in social responsibility of private enterprises. This paper suggests CBI (Corporate Business Incubator) in order to promote senior entrepreneurship. This study is expected to foster economic growth and job creation through utilizing increased elderly population in today's aging demographics. In addition, this study will be able to identify direction for government's role in boosting senior entrepreneurship.