프리스트레스된 압연강재보(H-BEAM)의 휨 거동에 대한 실험적 연구

임성순,정찬핵,Yhim, Sung Soon,Jeong, Chan Haek 한국강구조학회 2006 韓國鋼構造學會 論文集 Vol.18 No.2

본 연구는 H형 압연강재보에 강종이 다른 강재보 또는 강판을 부착하여 프리스트레스를 도입한 강재보의 휨 거동에 대한 실물실험결과를 비교 분석하였다. 또한 이론적인 해석과의 비교를 통하여 구조적인 성능을 검증하였다. 두 개의 부재를 결합하여 합성부재로 만드는데 있어서 결합시 부재간 서로 이완된 느슨한 상태에서 결합이 되기 때문에 하중이 증가함에 따라 부재간에 하중의 재분배가 일어나 그 구조적인 성능을 제대로 발휘하지 못한다. 따라서 두 부재를 합성시킬 때에는 프리스트레스를 가하여 접합해야 한다. 실험결과로부터 강재보에 추가로 강재보 또는 강판을 붙여 프리스트레스가 도입된 강재보는 강성증가와 프리스트레스에 의한 내하력 증가효과가 뚜렷함을 알 수 있었다. In this study, the experimental bending behaviors of an H-secti on-steel-beam-attached high-strength steel plate or steel beam were analyzed. Its structural performance was verified by comparing the results of the experiment and the analysis that were conducted. In fabricating an unprestressed composite beam using two members that have different strengths, the generated slip on the joint in proport problem because of the redistribution of force caused by the lose state of the joint. Therefore, when fabricating composite beams, it is important to load them with prestressed forces. Based on the results of the experiment that was conducted, the prestressed composite-steel-beam-attached steel plate or beam has a higher bending resistance and load-carrying capacit

임의방향 보강재를 가지는 복합적층 보강판의 해석

임성순,장석윤,박대용 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 논문집 Vol.8 No.2

사장교의 케이블 초기장력 및 기준길이 결정에 관한 연구

임성순 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 논문집 Vol.9 No.2

아치요소를 이용한 평면뼈대구조물의 기하학적 비선형해석

任性淳 서울시립대학교 산업기술연구소 1994 산업기술연구소논문집 Vol.2 No.-

Most of the general loads on frames will produce significant nonlinear responses. Most modern codes recommend that frames be designed to resist severe loading, dynamic loading as well as static one, through ductile action. And Large displacements may occur before this ductility is mobilized. To date, however, nonlinear analysis has not been simple and foolproof enough to gain significant acceptance by designers. This study presents the contributions made toward both objectives. In the area of nonlinear mechanics, one of the most comprehensive theories, the updated Lagrangian formulation, is first reviewed for two-dimensional plane framed structures. From this review a more physically meaningful and computationally efficient form of this method for nonlinear structural analysis is proposed. Secondly, the stiffness formulation of two-dimensional curved arch element based on differential geometry used to complete the computer program for nonlinear analysis of the plane framed structures. Numerical results are presented to demonstrate the efficiency and accuracy of the proposed element.

화학기상응축 공정으로 제조한 TiO₂ 나노분말의 광촉매 특성

임성순,남희영,윤성희,이창우,유지훈,이재성 한국분말야금학회 2003 한국분말재료학회지 (KPMI) Vol.10 No.2

$TiO_2$ nanopowder was synthesized by chemical vapor condensation (CVC) process and its photocatalytic property depending on microstructure was considered in terns of decomposition rate of organic compound. In order to control microstructure of $TiO_2$ nanopowder such as particle size and degree of agglomeration, precursor flow rate representing number concentration was changed as a process variable. In TEM observation, spherical $TiO_2$ nanoparticles with average size of 20 nm showed gradual increases in particle size and degree of agglomeration with increase of precursor flow rate. Also decomposition rate of organic compound increased with decreasing precursor flow rate. Thus, it was concluded that photocatalytic property was enhanced by targe surface area of disperse $TiO_2$ nanoparticles synthesized at lower precursor flow rate condition in CVC process.

장대 아치교 행어 파단에 의한 동적 해석

임성순,공민식,유이슬 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 논문집 Vol.14 No.2

장대 아치교 설계 시 시공단계와 완성단계에서 발생할 수 있는 문제에 대하여 검토하고 있으나 케이블 손상에 대한 구조안전성 평가는 매우 미흡한 실정이다. 따라서 본 연구는 공용 중 충돌사고로 인한 행어 파단 시 교량의 구조안전성을 분석하는 것을 연구 목적으로 한다. 이를 위하여 행어 파단에 따른 하중을 충격함수로 이상화하여 동적 해석을 수행하였다. 행어가 파단 되었을 경우 각 행어의 최대 장력은 파단 된 행어와 인접한 행어에서 발생한 것으로 나타났으며 정적 하중보다 동적 하중에서 크게 나타났다. 그러므로 장대 아치교의 구조안전성을 확보하기 위해 행어 파단에 따른 충격하중을 동적 하중으로 고려한 해석이 필요하다. 또한 본 연구의 해석 방법 및 결과는 이후 아치교 설계 시 참고자료로 활용될 수 있다. Recently, various evaluations concerning structural stability under construction step and completely constructed step have been executed during a Long-span Arch Bridge designing procedure. However, the breakage of cable-hangers of arched bridge in unexpected accident or periodic cable-replacement has not been considered. Therefore, the purpose of this study is that analyzing structural safety of arched bridge when the cable-hangers being fractured by that reasons. Dynamic analysis are performed by idealizing impact load to three types of impact functions as fracturing the cables. Consequently, when the hangers are fractured, the maximum tensile force by dynamic analysis is larger than those by static analysis. Therefore, the dynamic analysis is demanded to accurately obtain the responses for the structural stability with a realistic impact loading model in the breakage and replacement of cable hangers of long-span arched bride. Moreover, the analysis method and results in this study can be used to basic criteria in design.

케이블 보도교의 동적 특성

임성순,이래철 서울시립대학교 산업기술연구소 1999 산업기술연구소논문집 Vol.7 No.-

In general, cabled foot bridges are composed of upper or lower cables, hanger, grates, posts, and anchors. The characteristics of cabled foot bridges are similar to those of the suspension bridges in the path of load carrying. However, difference between characteristics of two models has been taken in natural modes: lateral mode in cabled foot bridges and vertical mode in suspension bridges. In order to determine the governing structural behaviors of cabled foot bridges, the elastic catenary cable element is used to analyze a cabled foot bridge in existence. From the calculated results, it is certified that the catenary cable element is of interesting finite element in analyzing a cabled foot bridges and is used to obtain a relevant responses of cabled foot bridges with a small numbers of catenary cable elements.

6경간 SCP 거더교의 연속화에 따른 중간 지점부 구조거동에 관한 연구

임성순,손석호,서기홍 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 논문집 Vol.8 No.4

이동하중을 받는 직선형 거더교의 동적거동분석

임성순 서울시립대학교 산업기술연구소 1996 산업기술연구소논문집 Vol.4 No.-

This study presents the dynamic responses of the straight girder bridges subjected to moving load with constant speed. The bridges is considered to be a continuous system of constant cross sectional properties. An exact solution to the governing differential equation is obtained in the form of the transformed equation derived by Fourier sine integral transformation method and Laplace integral method. Some of main conclusions are that the mass of the moving loads is an important factor in determining the impact factor for displacements and bending moments, and that the speed of the moving load may play a primary role in the design of straight girder bridges in considering the dynamic effects.

1축 대칭단면을 갖는 곡선교의 고유진동수특성

임성순,Yhim, Sung Soon 대한토목학회 1994 대한토목학회논문집 Vol.14 No.6

평면에서 곡선을 이루는 들보는 흔히 뒬효과를 고려한 원형곡선부재로 설계된다. 본 연구에서는 곡선교를 단면이 일축대칭이고 단순지지된 원형곡선부재로 이상화시켰다. 경계조건을 만족하는 변위형상함수를 퓨리어급수로 전개하고 이로부터 곡선교의 전동수방정식을 유도하였다. 곡선형교의 특성을 나타낼 수 있는 매개변수-중심각, 곡률계수 및 단면의 대칭성계수-의 변화에 따른 원형곡선부재의 고유진동수 특성분포를 보였다. 몇 개의 해석예를 통하여 고유진동수에 미치는 매개변수의 효과를 조사하였다. Beams curved in plan are often designed with the circular curved member system including warping effects. In this study, the curved bridges are idealized as the circular curved member system with singly symmetric cross sections and simply supported ends. Displacement fields of them to satisfy the boundary conditions are expanded by Fourier series and the governing equation of natural frequencies of them is derived. The distributions of the characteristics of natural frequencies of them are shown according to the variations of relevant parameters-angle of intersection, curvature, and parameter of symmetry of cross section which can represent the properties of the curved bridges. A parametric study is conducted to investigate the effect of relevant parameters on natural frequencies.