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.

연안정비 정책방향 -연안정비 기본계획 성과와 반성-

임성순 한국연안방재학회 2019 한국연안방재학회 학술발표대회 논문집 Vol.2019 No.1

주케이블의 슬라이딩을 고려한 현수교의 시공단계 해석

임성순,공민식,김병철 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 논문집 Vol.13 No.3

현수교는 주케이블이 목표하는 형상을 이루어 기하학적 강성을 갖도록 앵커, 새들과 같은 장치를 적용하고 있다. 지금까지의 연구에서는 두 장치를 모두 고정절점으로 단순화하여 해석하는 것이 일반적이었다. 그러나 새들의 경우 주케이블의 슬라이딩 현상이 발생할 수 있으며 이로 인하여 구조물의 응답이 달라진다. 특히 현수교의 시공단계 초기에 셋백로프를 철거하거나 셋백을 수행하지 않는 경우 새들 전후 주케이블의 장력 차이가 커지므로 슬라이딩이 발생하기 쉽다. 따라서 본 연구는 유한요소법을 이용한 케이블의 슬라이딩 해석방법을 제시하고 슬라이딩을 고려한 현수교의 시공단계별 해석을 수행하여 슬라이딩을 고려하지 않은 해석결과와 차이를 분석하였다. 슬라이딩을 고려한 해석을 통해 얻어진 결과는 구조물에 불리한 응답을 나타낼 수 있으므로 주케이블과 새들 사이의 슬라이딩을 고려한 해석은 필수적이다. 또한 본 연구의 슬라이딩 해석방법 및 해석결과는 이후 현수교의 설계와 시공시의 참고자료로 활용될 수 있다. Anchors and saddles are used to have sufficient geometrical rigidity and make target configuration of main cable of suspension bridge. Neglecting the sliding effect at saddles, points at them have been idealized as fixed nodes in lots of former studies. In general, sliding effects are reported to show significant structural behaviors of main cable and cause to the different responses of bridges. During early erection steps of the suspension bridge, especially, the sliding effect occurs easily because there is large difference of cable tension between main and side span in removing set-back ropes or not applying set-back. This study presents the finite element analysis considering to cable sliding effect and shows the comparison of differences between sliding and non-sliding at election sequence. The analysis of sliding between main cables and saddles needs to obtain more realistic responses because the analysis result can represent unfavorably different responses of bridges. Moreover, the sliding analysis method and results in this study can be used to basic criteria in engineering design and construction steps.

지진하중에 의한 사장교의 비선형 동적 응답

임성순 서울시립대학교 도시과학연구원 2001 도시과학논총 Vol.27 No.1

Cable-supported bridges consist of cables with high flexibility and girders with good stiffness. Typical models among these bridges are cable-stayed bridges and suspended bridges. In general, structural system composed of members with different strength presents very complex responses. Because cables with low stiffness cause geometrical non-linearity and entire structure shows up the non-linearity. When it subjects to earthquake excitation especially, the responses of cable-supported bridges are very complex. In this paper, Olympic grand bridge, typical cable-stayed bridge on Han-river in Seoul, is used as analytical model and cable is idealized as nonlinear Ernst's cable element. This paper presents the distribution of nonlinear dynamic responses of cable-stayed bridges subject to earthquake excitation.

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

케이블댐퍼 감쇠성능의 수치해석적 연구

임성순 한국복합신소재구조학회 2015 복합신소재구조학회논문집 Vol.6 No.2

Compared with a strong axial rigidity due to large intial tension, cable has a weak laterally flexural rigidity. A variety of dynamic loads such as traffic loads and wind loads etc. cause the cables to vibrate significantly and affect the mechanical properties and the performance of cables. Therefore, vibration reduction design is an urgent task to control the vibration of cable-supported bridges. Because a various kind of dampers have shown to reduce the amplitude and duration time of vibration of cable from measured date in field test, damper can be considered that it is effective device significantly to reduce the amplitude and duration time in vibration of cable. Vibration characteristics of cable can change according to manufacturing method and type of established form, and damper has been designed according to distribution of natural frequencies and vibration modes. In this study, numerical analysis is used to show the reduction effects of vibrations and present the design of damper for vibration reduction of cable.

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.

나선형(螺旋形) 곡선부재(曲線部材)의 자유진동(自由振動)에 관한 연구(?究)

임성순,장승필,Yhim, Sung Soon,Chang, Sung Pil 대한토목학회 1988 대한토목학회논문집 Vol.8 No.2

본 논문에서는 인터체인지나 램프시설 등에서 볼 수 있는 공간 곡선부재들을 나선형 곡선부재로 이상화시켰다. 나선의 기하학적 특성치와 초기 곡률을 고려하여 평형방정식을 유도하였으며 모우드 형상함수를 가정하여 단순지지된 나선형 곡선부재의 규준화된 고유진동수를 계산할 수 있는 모우드 방정식을 유도하였다. 이러한 모우드 방정식을 이용하여 나선형 곡선부재의 고유진동수, 모우드 형상 그리고 고유진동수의 분포를 규명하였다. The curved structures in space, such as multi-level inter-changes, ramped structures, and circular curved structures etc., are modelled as helically curved members with constant helix angle in this study. Equilibrium equations are derived, considering the geometrical properties and initial curvatures of helix. Modal equations of the simply supported helically curved members which can calculate the normalized natural frequencies are derived from these equations by assuming the modal shape function. These equations are used to calculate the normalized natural frequencies of the simply supported helically curved members and verify the distribution of the natural frequencies of them.

임의방향 보강재를 가지는 복합적층 보강판의 해석

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