외부 후 긴장 공법을 이용한 강합성보의 보강에 관한 연구

박용걸,박영훈,이승용,Park, Yong-Gul,Park, Young-Hoon,Lee, Seung-Yong 한국강구조학회 2000 韓國鋼構造學會 論文集 Vol.12 No.5

외부 후 긴장 공법은 설계에 수반되는 구조해석이 비교적 명확하여 강교량 구조물뿐만 아니라 건축구조물 등 그 적용 범위가 매우 넓은 보강방법이다. 본 연구에서는 후 긴장 공법에 있어서 긴장력 도입 과정의 강합성보의 거동을 연구하기 위하여 긴장력 증가에 따른 긴장재, 경간 중앙부 하부 플랜지, 정착단 주형 하부 플랜지의 도입 변형율과 긴장재 절곡 각도에 따른 도입 전단력 및 압축력을 실험 및 해석적으로 분석하였다. 또한 긴장력 도입 후 정적 휨 재하 실험을 수행하여 긴장력 도입 정도에 따른 휨 보강 정도를 분석하였으며, 절곡 각도의 변화에 따른 전단보강 및 휨 보강 양상을 연구하였다. 그 결과 외부 후 긴장력 도입에 따른 휨 보강 효과가 매우 높은 것으로 분석되었으며, 긴장재의 절곡 배치에 의해서는 추가적으로 전단보강 효과까지 나타났다. In strengthening structure, the external post-tensioning method which secure clearness in the structure analysis process is adopted to bridges as well as architecture structure. In this study, to investigate the behavior of composite beam in the process of post-tensioning, the amount of prestress force loss, the amount of prestressed compression stress at the lower flange and the behavior of lower flange connected with anchorage are analyzed by comparing the results of finite element analysis with the measured results of installed strain gauges. After finishing the post-tensioning, the strengthening effect of external post-tensioning method is analyzed by static loading test. It is also investigated that the strengthening effect of shear section in the harped external post-tensioning specimens.

철도 시설물의 피로손상과 대책

박용걸,Park, Yong-Gul 한국철도학회 2006 한국철도학회지 Vol.9 No.3

철도시설물의 피로손상과 대책

박용걸(Park Yong Gul) 한국철도학회 2006 철도저널 Vol.9 No.3

강철도교에 대한 외부 후긴장 보강공법의 적용에 관한 실험 및 해석적 연구

박용걸(Yong-Gul Park),박영훈(Young-Hoon Park),조선규(Sun-Kyu Cho),최정열(Jung-Youl Choi) 한국철도학회 2006 한국철도학회논문집 Vol.9 No.2

It analyzed the mechanical behaviors of non-ballasted railway bridge (steel plate girder type) with ballast reinforced on the finite element analysis, field test and laboratory test for the static and dynamic responses. The major objective of this study is to investigate the effects and application of reinforcement for steel plate girder railway bridge by the external post-tensioning method. The reinforcement of non-ballast railway bridge had obviously stable dynamic behaviors due to the additional dead force which was ballast. But in case of static behaviors, static displacements and stresses had increased nearly the allowable values. Therefore we analyzed the mechanical behaviors of non-ballasted railway bridge with ballast reinforced and external post-tensioning reinforced on the finite element analysis and laboratory test for the static and dynamic behavior. As a result, the reinforcement of ballasted railway bridge the external post-tensioning method are obviously effective for the additional dead force which is ballast. The analytical and experimental study are carried out to investigate the post-tension force decrease bending behavior and deflection in composite bridge for serviceability. The servicing railway bridge with ballast reinforced has need of the reasonable reinforcement measures which could be reducing the effect of additional dead load that degradation phenomenon of structure by an unusual stresses and a drop durability.

외부 후긴장 공법 적용에 따른 무도상 판형교의 동적거동 분석

박용걸(Yong-Gul Park),최동호(Dong-Ho Choi),최정열(Jung-Youl Choi),최준혁(Jun-Hyeok Choi) 한국철도학회 2006 한국철도학회논문집 Vol.9 No.2

The major objective of this study is to investigate the effects and application of external post-tensioning method for steel plate girder bridge. It analyzed the mechanical behaviors of steel plate girder bridge with applying external post-tensioning on the finite element analysis, field test and laboratory test for the lateral dynamic characteristics. As a result, the reinforcement of steel plate girder bridge the external post-tensioning method are obviously effective for the lateral dynamic response which is non-reinforced. The analytical and experimental study are carried out to investigate the post-tension force decrease lateral acceleration and deflection on steel plate girder bridge for serviceability. And the external post-tensioning method reduce dynamic maximum displacement(about 10∼24%), the increase of dynamic safety is predicted by adopting external post-tensioning method. From the dynamic test results of the servicing steel plate girder bridge, it is investigated that the change degree of natural frequency is very low with applying the external post-tensioning method The servicing steel plate girder bridge with external post-tensioning has need of the reasonable reinforcement measures which could be reducing the effect of lateral dynamic behavior that degradation phenomenon of structure by an unusual response characteristic and a drop durability.

현장측정을 통한 분기기 망간 크로싱의 피로수명 평가

박용걸(Yong-Gul Park),엄주환(Ju-Hwan Um),최정열(Jung-Youl Choi) 한국철도학회 2006 한국철도학회논문집 Vol.9 No.2

The major objective of this study is to investigate the fatigue life evaluation of immovability crossing for railway turnout by the field test. In railway engineering, an appliance is necessary to allow a vehicle to move from one track to another. This appliance came to be known technically as turnout. So, turnout is required very complex railway technologies such as rolling stock, track. Due to the plan under the application of high speed train, turnout are needed more stable for fatigue behaviors. It analyzed the mechanical behaviors of turnout crossing with propose its advanced technical type on the field test and fatigue evaluation for the dynamic fatigue characteristics. As a result, the advanced type crossing are obviously effective for the fatigue damage ratio and dynamic response which is non-modified type. The analytical and experimental study are carried out to investigate the passing path of contact surface and fatigue damage trend decrease dynamic stresses and deflections on advanced crossing type. And the advanced type reduce dynamic fatigue damage ratio and increase fatigue life(about each 38%) more than non-modified type. From the field test results of the servicing turnout crossing, it is evaluated that the modification of contact angle, weight, material and sectional properties is very effective for ensure against fatigue risks.

틸팅차량 주행에 따른 기존선 궤도의 주행안정성 평가

박용걸(Yong-Gul Park),엄기영(Ki-Young Eum),최정열(Jung-Youl Choi),성덕룡(Deok-Yong Sung) 한국철도학회 2007 한국철도학회논문집 Vol.10 No.6

기존선 속도향상을 위해 개발된 틸팅열차는 기존열차에 비하여 승차감의 저하 없이 곡선부를 더욱 빠르게 주행할 수 있기 때문에 전체 운행시간을 단축시킬 수 있는 장점이 있다. 그러나 일반적으로 주행열차에 의해 궤도에 발생하는 힘은 주행속도의 함수로 표현되므로 주행속도가 증가하는 만큼 궤도가 부담해야할 힘의 크기도 증가하게 된다. 따라서 본 연구에서는 틸팅차량의 기존선 곡선부 주행 시 내ㆍ외측 레일의 탈선계수를 산정하여, 곡선반경 증속 여부 선로개량 유ㆍ무에 따른 주행안정성을 평가하였으며, 기존에 운행중인 일반열차와 고속열차의 주행안정성을 비교, 분석하였다. 연구결과, 측정대상 구간에서 측정된 동적 윤중을 이용하여 산출한 동적 윤중 감소량은 차체진동을 고려한 차량 전복에 대한 동적윤중 감소한계치를 모두 만족하는 것으로 나타나 향후 틸팅차량 투입시 대상구간에서의 윤중 감소에 따른 열차탈선의 위험은 없을 것으로 판단된다. A tilting train, which was developed to run the curve section without reducing the speed and compromising the riding quality, can improve the speed so as to reduce the travel time, compared to the existing trains. Then the force generated by the train operation to the track is in proportion to train operation speed, which means the track shall bear the increased force as much as the increase in train operation speed. Particularly, wheel load and lateral wheel load generated by train operation and distributed to the rail tend to cause the track to suffer the strain and furthermore the severe disaster such as derailment. To deal with such problem and ensure the train will run safety and stably, the tolerance in wheel load change, lateral wheel load and derailment coefficient was determined for quantitative evaluation of the train operation stability. In this study, derailment coefficient of inner and outer rail at existing curve section of tilting train was determined to evaluate the curve radius, possibility of acceleration and the need of rail improvement, which was then compared with the existing traditional train and high speed train. Conducting the quantitative evaluation of dynamic wheel load and lateral wheel load of each train, which was based on field survey, derailment coefficient and static & dynamic wheel load change, which serve the evaluation criteria of train operation stability, were determined for comparison with the standards, thereby analyzing the stability of the tilting train.

외부 후긴장에 따른 합성보 거동에 대한 실험적 연구

박용걸 ( Park Yong-gul ),박영훈 ( Park Young-hoon ),오창렬 ( Oh Chang-yul ),백범렬 ( Baek Bum-yul ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1

The major objective of this study is to investigate experimental behavior of composite steel plate reinforced by the external prestessing method. We measured the change of structunal behaviors according to the amount of prestressing force and investigated the effect of shear strengthening according to the degree of angle in tendon. Finally, we analysed the change of load carrying capacity before and after reinforcement using external prestressing method in bridges.

현장측정을 통한 자갈도상궤도의 동적 거동 분석

박용걸(Yong-Gul Park),최정열(Jung-Youl Choi) 한국철도학회 2006 한국철도학회논문집 Vol.9 No.4

방진궤도시스템 적용에 따른 강철도 무도상 판형교의 거동 분석

박용걸(Yong-Gul Park),최정열(Jung-Youl Choi),엄맥(Mac Eom),강덕만(Duk-Man Kang) 한국철도학회 2006 한국철도학회논문집 Vol.9 No.6