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배두병,윤석구,함상희,Bae, Doo Byong,Youn, Seok Goo,Ham, Sang Hee 한국강구조학회 2004 韓國鋼構造學會 論文集 Vol.16 No.6
콘크리트의 건조수축에 의한 합성거더의 장기거동을 평가하기 위해 수행한 실험과 이론적 분석방법에 대해 기술하였다. 합성거더를 제작하여 장기간 실내실험을 통해 콘크리트의 건조수축에 따른 합성보의 처짐, 곡률변화 및 변형률변화를 측정하였으며, 실험결과를 AEMM(Age-adjusted Effective Modulus Method)을 이용한 해석치와 비교하였다. 또한 콘크리트의 건조수축에 의한 합성거더의 장기거동에 영향을 미치는 여러 변수들에 대한 해석을 수행하였다. 실험결과 합성거더의 장기거동은 AEMM에 의해 적절히 평가할 수 있다는 것을 확인할 수 있었다. 합성거더의 콘크리트 단면에 커다란 인장응력이 발생하기 때문에 연속교 부모멘트부뿐만 아니라 단순교 정모멘트부에도 횡방향균열이 발생할 수 있다는 것을 보였으며, 횡방향 균열을 무시하는 경우 강거더에 작용하는 응력이 과대평가 될 수 있다는 것을 확인하였다. 이상의 연구결과를 토대로 콘크리트의 건조수축에 의한 합성거더의 장기거동 평가시 콘크리트 단면에 발생할 수 있는 횡방향균열을 고려하는 것이 합리적이라고 판단된다. Experimental tests and theoretical methods of the analysis of the concrete shrinkage behaviors of steel-concrete composite girders are described herein. Steel-concrete composite test specimens were fabricated in the laboratory, and long-term behaviors such as deflections, curvatures, and strains were measured for one year. Test results were compared to the analytical results obtained by using the age-adjusted effective modulus method (AEMM). In addition, composite girders have been analyzed to investigate the effects of several parameters on the concrete shrinkage behaviors. From the long-term test results, it could be used to validate AEMM for the evaluation of the shrinkage behavior of composite girders. Because the shrinkage of the reinforced concrete slab in composite girders may lead to large tensile stresses in the concrete section, the transverse cracking of the slab could occur both in the positive and negative regions. Therefore, if the cracking of concrete would be ignored,it might lead to an overestimation of the stresses of the steel section of composite girders. Based on this research, it is proposed that the effect of transverse concrete cracking on the shrinkage behavior of steel-concrete composite bridges be considered.
시공중인 장경간 Plate-Girder교의 건초수축에 의한 영향 연구
배두병(Doo Byong Bae) 한국강구조학회 1992 韓國鋼構造學會誌 Vol.4 No.4
In the design and construction of plate girder composite bridges, the stresses produced by the placement sequence of deck slab segment is often considered, but not the stresses introduced to the girder by way of concrete shrinkage. For this study, a seven-span continuous four-girder twin bridge was chosen for the analysis. During the construction phase, strain gages were placed upon the bare steel girders. A three dimensional finite element model of the bridge was developed and a loading sequence equivalent to the placement of concrete was applied. A second loading was applied to the deck elements to simulate the forces generated by the shrinkage of the deck concrete. The dead load stresses resulting from the three dimensional model were then compared to the corresponding results of a two dimensional grillage model analysis. Stresses at each stage of the placement of the concrete deck-slab were found to exceed computed design values. The dead load and shrinkage stresses from the three dimensional finite element model were superimposed to obtain the total or combined stresses. These combined stresses were in good agreement with the stresses from field measurements.
배두병(Doo Byong Bae) 한국강구조학회 1995 韓國鋼構造學會誌 Vol.7 No.2
A classical solution technique is developed for analyzing multi-girder composite bridge structures. A set of biharmonic equations is employed to solve a set of differential equations for plane stress and flexural displacements for each deck slab between girders. Boundary conditions are obtained at girder-slab junctions and at free edges by considering the equilibrium and compatibility conditions on the slab-girder interface and at the interface of two neighbouring deck-slabs. Simultaneous solutions can be obtained for different geometrical arrangements of multi-girder composite structures, by substituting the corresponding derivatives of the solutions into the boundary conditions. The validity of the solutions is verified by comparison with experimental results and with results of a finite element analysis. Using the solutions developed in this paper, the behavior of multi-girder composite bridges can be examined efficiently by varying the controlling variables and conducting an extensive parametric study.
재령보정 유효계수방법에 의한 프리스트레스트 합성거더의 장기거동 실험 검증
배두병(Doo Byong Bae),오창국(Chang Kook Oh),최석환(Sok Hwan Choi) 한국강구조학회 2012 韓國鋼構造學會 論文集 Vol.24 No.5
Prestressed composite girders provide efficient composite action by applying prestress to the sub-encasing concrete. In this study, an enhanced prestressed composite girder with forms suspended from the steel girder is utilized. Long-term behavior of the prestressed composite girder is estimated using age-adjusted effective modulus method, which is verified experimentally using measurements obtained from an in-service bridge. Then, parametric study is carried out to investigate the influences caused by ambient temperature, humidity, prestressing and concrete casting date.
2거더 강-콘크리트 합성형 철도교의 거동에 대한 2차부재의 영향 평가
배두병(Doo-byong Bae),조준희(Joon-hee Cho) 한국철도학회 2005 한국철도학회논문집 Vol.8 No.1
Steel-Concrete Composite two girder railway bridges applying high performance steel with extra thick plate have economic and aesthetic advantages due to the simplification of manufacturing and construction process. However, steel bridges are seldom adopted in domestic railway bridge, since steel bridges are not efficient as R.C bridges considering dynamic characteristics and noise, etc. While highway bridges do not have lower horizontal bracing and larger interval of diaphragm cross beam, railway bridges install lower horizontal bracings to control the torsion due to heavy eccentrical line load. Accurate finite element analysis were performed with the parameters of existence of bracing and bracing shape, with the cross beam interval and stiffness, etc. To find out the effects of secondary members such as horizontal bracing‘s and diaphragms, static and dynamic analysis have been performed by using finite element method. In this study, few member plate-girder bridges are analyzed with variable span lengths to examine the dynamic behavior and limits of damping. And though lateral bracing‘s are members against torsion, but lateral bracing s absence is no big problem. Time history analysis using mode superposition method makes proof of this result.