A5025440215- Structural Health Monitoring Techniques
- Structural Engineering and Vibration Analysis
- Ultrasonics and Acoustic Wave Propagation
- Seismic Performance and Analysis
- Geotechnical Engineering and Underground Structures
- Railway Engineering and Dynamics
- Structural Behavior of Reinforced Concrete
- Vibration and Dynamic Analysis
- Structural Response to Dynamic Loads
- Concrete Corrosion and Durability
- Optical measurement and interference techniques
- Engineering Applied Research
- Hydraulic and Pneumatic Systems
- Geophysical Methods and Applications
- Infrastructure Maintenance and Monitoring
- Fire effects on concrete materials
- Natural Fiber Reinforced Composites
- Dynamics and Control of Mechanical Systems
- Non-Destructive Testing Techniques
- Advanced Cellulose Research Studies
- Power Line Inspection Robots
- Advanced Surface Polishing Techniques
- Laser and Thermal Forming Techniques
- Magnetic Properties and Applications
- Innovations in Concrete and Construction Materials
Kyungnam University
2009-2022
Hongik University
2014
This paper introduces an innovative method for making cement-based composites from corn straw plants, and investigates the strength, thermal conductivity, hydration characteristics of composites. Corn is a natural, renewable, breathable insulation composite that contains cellular sealed pores. large amount soluble cellulosic sugar, which hinders reaction Portland cement affects use as building material. In this study, 3 wt.% siliceous solution was used surface treatment particles to prevent...
This article suggests a new technique for the estimation of tension double hanger cable system that is often used in suspension bridge. The considered consists two independent parallel cables tied by lateral clamp. Measuring natural frequencies system, determined frequency-based identification with aid finite element analysis. proposed able to simultaneously identify tension, flexural rigidity and axial target system. Laboratory experiments show errors approach are less than 3%. For...
본 연구는 부착식 PSC 텐던의 응력파 속도를 계측하여 텐던에 도입된 긴장응력을 추정 할 수 있는 실험식을 제안한다. 실용적 실험식의 도출을 위하여 도입 긴장력이 다른 다수의 PSC시험체가 제작되었으며, 다양한 조건에서 종진동 실험이 반복 수행되었다. 응력과 속도 사이의 관계에 영향을 미칠 온도, 길이 및 개수 등이 영향인자로 고려되었으며, 상사의 법칙을 적용하여 무차원 실험식이 도출 되었다. 제안 기법의 현장 적용성 검증은 실제 발전소 격납건물에 설치된 수직텐던에 대하여 제안식을 이용하여 추정된 긴장응력은 설계응력과 유사하다. This study proposes an experimental formula that can estimate the applied tensile stress of a bonded by measuring longitudinal wave velocity tendon. To develop practical formula, various specimens...
Successive earthquakes of Kocaeli and Duzce within three months indicated that even the survived lifeline structures such as bridges under former event may have damage or collapse potential latter due to their possible stiffness degradation. It is thus important a rigorous seismic analysis should account for effect prior earthquake damage. For this purpose, nonlinear reinforced concrete bridge structure has been carried out both single multiple ground motions. Behavior response evaluation...
This work introduces a recent application of the online nondestructive damage assessment system into cable‐stayed bridge. A set ambient modal parameters are automatically extracted every 20 minutes using real‐time signal data collected from total 26 accelerometers attached on deck plate Then, flexibilities reconstructed by combination with approximated mass girder. Next, curvature flexibility is central difference formula. Finally, flexural index equations constructed comparing damaged state...
This work introduces a modal testing and analysis results of the mock-up for layered stone pagoda. The pagoda has been horizontally excited by an impact hammer. As to measured acceleration time responses, first five lower mode shapes natural frequency are extracted TDD technique. It is observed that delay shear wave occurs through friction surfaces. Such phenomena cannot be described using traditional analytical models such as continuum cantilever beam model or discrete building model....
A vibration-based nondestructive damage evaluation technique for a curved thin beam is introduced. The proposed method capable of detecting, locating, and sizing structural simultaneously by using few the lower natural frequencies their corresponding mode shapes before after small event. approach utilizes modal flexibilities reconstructed from measured parameters. rigorous system equations governing curvature flexibility derived in context elasticity. To solve resulting equations, an...
본 연구는 부착식 PSC 텐던의 종진동 탄성파속도를 정확히 추출하기 위한 가장 효율적인 방법을 제안한다. 도입 긴장력이 다른 시험체에 대하여 실험이 수행되었다. 계측된 구조응답으로부터 추정하기 위하여 필터링된 가속도 신호를 이용한 방법, 속도 반향파를 그리고 주파수를 방법 등이 비교 검토 되었다. 분석결과를 살펴보면, 이용하는 방법이 실용적인 측면에서 효율적임을 알 수 있다. This study proposes a most effective way to estimate longitudinal elastic wave velocity of bonded tendon. Various vibration tests are conducted for prestressed concrete beams with different applied prestress levels. To from measured structural responses, the various estimation...
This work examines the feasibility for estimating existing tensile stress on a stressed wire using permeability of magnetic flux. A closed circuit has been constructed to induce flux inside steel wire. With different tension levels wire, measured. Two experimental case studies have conducted examination sensitivity One is varying-length test, and other fixed-length test. The results show that in test inversely proportional applied stress, while linearly It thus expected can be promising...
본 연구는 비부착식 PSC 텐던에 도입된 응력이 종진동 응력파 속도에 미치는 영향을 실험적으로 규명한다. 도입 긴장력이 다른 강연선과 강선에 대하여 임팩트 해머를 이용한 종방향 가진이 수행되었고 응력파의 속도 계측이 수행되었다. 계측된 구조응답으로부터 속도가 도입장력의 크기에 선형 비례하는 것이 강연선 및 강선 모두의 경우에서 확인되었다. 그러나 응력파속도의 도입장력에 대한 민감도가 매우 낮다. 또한 무차원 해석결과를 살펴보면, 긴장재의 인장강도에 따라서도 응력파속도가 변화하는 것으로 추론된다. This study experimentally investigates the effects of applied stress level on wave velocity unbonded tendon. A set longitudinal impact-echo tests with respect to several prestress levels are conducted for both...