상판 타설중의 7경간 연속 Plate-Girder 합성교의 거동

배두병 대한토목학회 1992 대한토목학회 학술발표회 논문집 Vol.1992 No.1

Behivior of Preflex Beam in Manufacturing Process

배두병,이광명 대한토목학회 2004 KSCE JOURNAL OF CIVIL ENGINEERING Vol.8 No.1

This paper presents the results of research on the behavior of preflex beam considering manufacturing process. A series of test-specimen were made and tested, which included the traditional preflex beam, preflex beams with additional shear connectors above the bottom flange and the beams with some shear keys. The test results are compared with the values given in the design code and analytical results using finite element method with 3-D model. Time dependent effects are also estimated and compared with the values given in design code. It is found that the effects of residual stress in steel girder are greater than expected, which results in more loss of camber, and the produced stress due to shrinkage of casing concrete are far greater than the values given in design code, which may cause the tension cracks in casing concrete of bottom flange. Based on the results of the study, a few proposals are made for improving the quality and durability of preflex beam.

Experimental Study on Fatigue Strength of In-plane Welded Gusset Joints

배두병 대한토목학회 2004 KSCE JOURNAL OF CIVIL ENGINEERING Vol.8 No.1

This paper presents the results of three phases of fatigue tests for the fatigue strength of in-plane welded gusset joints which are most common details inevitably existed in the region of high stress range. Totally fifty seven fatigue specimens with various thickness and strengths were made and the tensile fatigue tests were performed. One full scale beam fatigue tests was also carried out. The validity of the fatigue strengths of those details in specification was proved and the effects of thickness of flanges and welded attachments, length of attachments and the strength of applied steel were examined. The characteristics of crack initiation and propagation were also observed. The test results are evaluated by comparing with other test data and the fatigue criteria of other countries. In order to find out the degree of stress concentration in the weld toe depending on geometric configuration such as the attachment length and transition radius, analytical works were also carried out. Comparing with present specification, analytical results indicate that there are need of revising and subdividing the detail categories.

강바닥판교의 종리브-횡리브 교차연결 상세변화에 따른 최적설계방안의 수치해석 연구

배두병,공병승 한국전산구조공학회 2004 한국전산구조공학회논문집 Vol.17 No.3

최근 장대화 되어가는 강교량의 건설 기술발전에 따라, 자중이 가벼운 강바닥판 형식의 교량 사용이 증가되고 있다. 그러나 강바닥판 교량은 피로에 매우 취약한 구조형식이며, 특히 종리브와 횡리브가 교차되는 상세부에서의 피로균열은 강바닥판 교량이 가지고 있는 가장 큰 문제점 중 하나이다. 이러한 피로균열의 발생원인은 횡리브의 면외거동에 의한 2차 응력으로부터 유발된다. 본 연구에서는 강바닥판 교량의 피로균열을 억제하고, 종리브-횡리브 교차연결부의 상세개선을 위해 3차원 실물모형체의 피로실험과 범용구조해석 프로그램인 LUSAS를 이용한 세부변수 해석을 병행하여 최적의 상세를 제시하기 위한 연구를 수행하였다. 연구 결과, 국내 표준단면 형상에 곡선형 벌크헤드 플레이트를 부착한 상세가 가장 유리한 것으로 나타났으며, 세부 변수해석에 의한 개선 단면 적용시 발생되는 응력값이 최대의 경우 약 50%이상까지 감소하는 것으로 나타났다. 응력의 감소와 함께 횡리브의 간격 증대(G=400)에 따른 4%의 강재량과 34%의 용접길이 감소로 제작원가 절감 및 피로에 유리한 강바닥판교의 제작이 가능하게 되었다. The use of the othotropic steel deck is steadily increased due to the advance of the technology in the steel bridges which recently have been longer. But the othotropic steel deck bridge is the structure that is very fragile to the fatigue, especially, the fatigue crack at the cross of the longitudinal rib and transversal rib is one of the biggest problems that othotropic steel deck bridges have. The causes of these fatigue cracks come from the secondary stress on out-plane behavior of transversal rib. In this study, we conducted the experiment to find the optimal details to improve fatigue strength on intersection between longitudinal rib and transversal rib in the othotropic steel deck bridge through numerical analysis using the experiment of the fatigue in the 3-dimensional real structure and program LUSAS. As a result of study, it is showed that the details of the korean standard section attached with a curved bulkhead plate is the most profitable. And, it is indicated that the stress which is generated when the reform improved section by parametic study can be reduced by about 50% at most or more. Along with the reduced stress and the longer interval between transversal ribs(G=400), the decreased steel amount by 4% and the shortened welding length by 34% make it possible to produce the othotropic steel deck bridge which is strong against fatigue.

강 교량의 새로운 설계법

배두병 한국강구조학회 1992 韓國鋼構造學會誌 Vol.4 No.3

U-Rib를 적용한 강바닥판교의 피로강도에 대한 실험적 연구

배두병 국민대학교 생산기술연구소 2003 공학기술논문집 Vol.26 No.-

This paper presents the results of investigating the general behavior and fatigue strength of orthotropic steel deck plate system with internal diaphragms. Two types of section that is considered best details were selected, which are typical Korea standard section, and Rabbit type section widely used in Europe. Internal daiphragms were installed to verify the reduction of stress range and its effiency. Instead of fillet welding for the connection of longitudinal rib and floor beam which is widely used in Korea, full penetration welding was applied partly. To simulate the real behavior of orthotropic steel deck system, three dimensional specimen was made, and loading conditons were decided considerably in-plane stress and both in-plane and out-of-plane stress effects. With this specimen, total cycle of 2,530,000 fatigue test was performed. Five fatigue cracks were developed at the area under in-plane and out-of-plane stress. Most of cracks were developed above the fatigue strength presented in AASHTO LRFD Bridge Design Specification. Some cracks were below the fatigue strength as expected, because of imperfection of end of the welding and imperfect scallop radius by wrapping. It is known that quality of welding, scallop radius, and loading condition control fatigue strength in orthotropic steel deck.

Shaking Table Test of Steel Cylindrical Liquid Storage Tank Considering the Roof Characteristics

배두병,박장호 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.4

Steel cylindrical tanks are widely used for the storage of hazardous substances of which leakage must be prevented under any circumstances. However, the dynamic response of the steel cylindrical liquid storage tank depends sensitively on the fl uid– structure interaction and the vibration of the tank structure and necessitates clarifi cation for the safety of the tank structure. This paper presents the results of shaking table tests performed to examine the dynamic behavior of a scaled cylindrical steel tank model considering the presence or not of fi xed roof and added mass at the top of the tank for various fl uid levels. The test results confi rm the occurrence of both beam-type and oval-type vibration modes and show that the larger content of liquid inside the container amplifi ed the acceleration along the height of the cylindrical tank. The oval-type vibration modes are seen to be more dominant in case of large water-to-structure mass ratio.

강바닥판교 가로리브의 최적 시스템 연구

배두병 한국강구조학회 2018 韓國鋼構造學會 論文集 Vol.30 No.6

Since the cross ribs and U-ribs of existing orthotropic steel deck system are designed by Pelikan-Esslinger method, dimensions and arrangements of cross ribs and U-ribs may be designed too conservatively. Also the Pelikan-Esslinger method does not consider fatigue problems at scallop where is crossing the longitudinal and lateral ribs(cross ribs), due to stress concentration. To improve the cross rib system, a parametric study which includes the distance of cross rib, the dimensions of web and the shape of scallop of cross rib was performed. Using the result of a parametric study, improved cross rib system which increases the fatigue strength by reducing the stress concentration at scallop and which is more economical is suggested. 기존의 강바닥판교 가로리브 및 세로리브 설계는 Pelikan-Esslinger 방법을 통해 해석한 결과를 적용하여 가로리브 간격 등이 너무 보수적으로 배치되어 있어 비경제적이고 세로리브와 가로리브가 교차하는 스캘럽부의 응력집중에 대한 고려가 없어 피로에취약한 문제가 있다. 이 연구에서는 최적의 강바닥판을 찾는 연구의 일환으로 강바닥판 가로리브의 간격, 단면크기, 스캘럽 형상을 변수로 한 해석적 연구를 수행하여 피로에 취약한 가로리브 스캘럽부의 응력집중을 줄여 피로강도를 높이고, 기존의 시스템보다는 경제적인 가로보 시스템을 제안하고자 한다

강교량의 경제적 설계 방안

배두병 한국강구조학회 1994 韓國鋼構造學會誌 Vol.6 No.1

철강과 강구조학회

배두병 한국강구조학회 2013 韓國鋼構造學會誌 Vol.25 No.6