• Title, Summary, Keyword: cable stiffness

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Seismic Fragility Analysis of a Cable-stayed Bridge with Energy Dissipation Devices (에너지 소산장치를 장착한 사장교의 지진 취약도 해석)

  • Park, Won-Suk;Kim, Dong-Seok;Choi, Hyun-Sok;Koh, Hyun-Moo
    • Journal of the Earthquake Engineering Society of Korea
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    • v.10 no.3
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    • pp.1-11
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    • 2006
  • This paper presents a seismic fragility analysis method for a cable-stayed bridge with energy dissipation devices. Model uncertainties represented by random variables include input ground motions, characteristics of energy dissipation devices and the stiffness of cable-stayed bridge. Using linear regression, we established demand models for the fragility analysis from the relationship between maximum responses and the intensity of input ground motions. For capacity models, we considered the moment and shear force of the main tower, longitudinal displacement of the girder, deviation of the stay cables tension and the local buckling of the main steel tower as the limit states for cable-stayed bridge. As a numerical example, fragility analysis results for the 2nd Jindo bridge are presented. The effect of energy dissipation devices is also briefly discussed.

Free Vibration Analysis of a 3-dimensional Cable-Stayed Bridge with the Unsymmetric Girder Cross-section (비대칭단면 주형을 갖는 3차원 사장교의 고유진동해석)

  • Kim, Chul Young;Chang, Sung Pil
    • Journal of The Korean Society of Civil Engineers
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    • v.11 no.2
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    • pp.15-26
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    • 1991
  • The lateral forces such as the earthquake and wind my cause the torsion to be coupled with the lateral bending in the gider, the cross-section of wich has only one axis of symmetry. This induces additional stresses especially in cables arranged in double-planes. Since this effect cannot be considered by using the conventional frame elements, the stiffness and the mass matrices of the geometrically nonlinear thin-walled frame element are developed in this study to model the girder. The equivalent modulus of elasticity proposed by Ernst is used for the cable elements. Verification of the present theory is made through a numerical example. Then, the free vibration of a three dimensional cable-stayed bridge is analyzed to study the coupled flexural-torsional behavior.

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Seismic Response Control of a Cable-Stayed Bridge using a $\mu$-Synthesis Method ($\mu$-합성법을 이용한 사장교의 지진응답 제어)

  • 박규식;정형조;윤우현;이인원
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.476-483
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    • 2004
  • This paper presents a hybrid system combining lead rubber bearings and hydraulic actuators controlled by a μ-synthesis method for seismic response control of a cable-stayed bridge. A hybrid system could alleviate some of restrictions and limitations that exist when each system is acting alone because multiple control devices are operating. Therefore, the overall control performance of a hybrid system may be improved compared to each system, however the overall system robustness may be negatively impacted by active device in the hybrid system or active controller may cause instability due to small margins. Therefore, a f-synthesis method that guarantees the robust performance is considered to enhance the possibility of real applications of the control system. The control performances of the proposed control system are compared with those of passive, active, semiactive control systems and hybrid system controlled by LQG algorithm and an extensive robust analysis with respect to stiffness and mass matrices perturbation and time delay of actuator is performed. Numerical simulation results show that the control performance of the proposed control system is superior to that of the passive system and slightly better than that of the active and semiactive systems and two hybrid systems show similar control performances. Furthermore, the hybrid system controlled by a μ-synthesis method shows the good robustness without loss of control performances. Therefore, the proposed control system could effectively be used to seismically excited cable-stayed bridge which contains many uncertainties.

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Disturbance Observer Based Sliding Mode Control for Link of Manipulator Driven by Elastic Cable (탄성 케이블로 구동되는 조작기 링크의 외란 관측기 기반 슬라이딩모드 제어)

  • Kang, Min-Sig
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.22 no.10
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    • pp.949-958
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    • 2012
  • Position tracking control of a link of a slave manipulator which needed to track the corresponding link of a master manipulator was addressed in this paper. Since driving torque from motor is transmitted through a set of flexible cable to link, the motion control system is modeled by a two-mass model connected with elastic coupling which has finite stiffness. Relative vibration of two-mass resonant system is a serious problem to operate manipulator. This paper proposed sliding mode control to reduce resonant vibration and fine position tracking control. Also, a pseudo-sliding mode control which uses a saturation function instead of a signum function was discussed and showed that the pseudo-sliding mode control can improve disturbance regulation performance as well as guarantees fine command tracking without chattering which is an inherent drawback of basic sliding mode control. In addition, a disturbance observer based sliding mode control has been suggested to improve disturbance regulation performance. The feasibility of the proposed control design was verified along with some simulation results.

Plan IE Design Of Extradosed Bridge Supported by Single Plane Cables (일면지지식 Extradosed교의 계획 및 설계)

  • 이종대;이두화;권소진;김종수;손준상
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.615-620
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    • 2001
  • The aim of this paper is to open up a relatively new type in bridge engineering by introducing plan and design of extradosed bridge which is implemented in Sungnam-Janghowon T/K project. The topic encompasses parametric study including the behavior of the bridge relevant to the cable layout, the distance from pier table to the first cable's location, the height of pylon, the stiffness of cross section and wind vibration to ascertain sectional type of bridge and span length. For the purpose of the knowledge base presented here, the important feature of design is recommended such as modeling method, camber control, finite element analysis and heat hydration of pier table. We can verify the issue related to the characteristics of extradosed bridge as a result of study and design endeavor.

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Construction Stage Analysis of Extradosed PSC Box Bridges (Extradosed PSC Box 교의 시공단계해석)

  • 윤군진;이완수;이종신;김성찬
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.347-354
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    • 2001
  • Extradosed PSC Box bridges, newly emerging type of structures in construction market, have a characteristic in that external tendons are used for strengthening PSC Box girder like stay cables in cable stayed bridges. In this study, a series of constructions stage analysis procedure, including initial shape analysis, backward analysis and forward analysis, have been performed in order to investigate long-term behavior of extradosed PSC box bridges, using PCCAP-a computer program for time-dependent stage analysis of PSC cable stayed bridges. CEB-FIP 1978 model was used for the consideration of time-dependent effect of concrete material. Showing the validity of the analysis results with RM SPACE FRAME, it has been confirmd that time-dependent effects become less consequential as the stiffness of girder becomes larger.

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Stochastic Finite Element Analysis for Truss Structures (트러스구조물의 확률론적 유한요소 해석)

  • Bang, Myung Suk
    • Journal of The Korean Society of Civil Engineers
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    • v.13 no.1
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    • pp.55-63
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    • 1993
  • Finite element analyses are conducted with stochastic elastic moduli when truss structures are subjected to static loads of a deterministic nature. Stochastic stiffness matrix is derived from stochastic shape functions and numerical analyses are performed within the framework of the Monte Carlo method. Analysis methods are verified for the space truss and applied to cable stayed bridge for determining the cable force.

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Estimation of tension force of stay cables using vibration method (진동법을 이용한 지지케이블의 장력추정)

  • Chang, Kug-Kwan;Jin, Byung-Chang;Chun, Young-Soo;Han, Tae-Kyung;Kang, Woo-Goo
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.77-78
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    • 2009
  • This study is to consider the character of cables in six World-Cup stadiums constructed in 2002 in Korea and to inspect problem on application of existing theory. The result of experiment shows that it is possible to determine the tension force of the real cables with an accuracy of 10${\sim}$60 by taking the cable bending stiffness. However, the reliance of the tension force experimentally determined could be changed in tension in the cable.

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Maintenance And Reinforcement Design Of Olympic fencing Stadium (올림픽 펜싱경기장의 보수.보강설계)

  • HwangBo, Suk;Yoon, Kwang-Jae;Han, Sang-Eul
    • Proceeding of KASS Symposium
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    • pp.108-115
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    • 2005
  • Maintenance and reinforcement are very important especially in the case of the hybrid structures. In this paper, we introduce the maintenance and reinforcement design method of cable dome structures. In the case of the Olympic fencing stadium structural system has the stiffness in dependence of the initial tension force. Therefore, the verification of this phenomenon is very important. The result shows that the final tension force which is measured is almost reached to the calculated aim tension force after the maintenance ana reinforcement works is confirmed.

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Analytical method for the out-of-plane buckling of the jib system with middle strut

  • Wang, T.F.;Lu, N.L.;Lan, P.
    • Steel and Composite Structures
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    • v.21 no.5
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    • pp.963-980
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    • 2016
  • The jib system with middle strut is widely used to achieve the large arm length in the large scale tower crane and the deployability in the mobile construction crane. In this paper, an analytical solution for the out-of-plane buckling of the jib system with middle strut is proposed. To obtain the analytical expression of the buckling characteristic equation, the method of differential equation was adopted by establishing the bending and torsional differential equation of the jib system under the instability critical state. Compared with the numerical solutions of the finite element software ANSYS, the analytical results in this work agree well with them. Therefore, the correctness of the results in this work can be confirmed. Then the influences of the lateral stiffness of the cable fixed joint, the dip angle of the strut, the inertia moment of the strut, and the horizontal position of the cable fixed joint on the out-of-plane buckling behavior of the jib system were investigated.