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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Computational Structural Engineering Institute of Korea
Journal Basic Information
Journal DOI :
The Computational Structural Engineering Institute
Editor in Chief :
Volume & Issues
Volume 21, Issue 6 - Dec 2008
Volume 21, Issue 5 - Oct 2008
Volume 21, Issue 4 - Aug 2008
Volume 21, Issue 3 - Jun 2008
Volume 21, Issue 2 - Apr 2008
Volume 21, Issue 1 - Feb 2008
Selecting the target year
Reliability Based Design Optimization with Variation of Standard Deviation
Lim, O-Kaung ; Kim, Hyung-Wook ; Choi, Eun-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 413~419
Deterministic design optimization (DO) does not explicitly deal with a variety of factors from inherent randomness and uncertainties. Reliability based design optimization(RBDO) is necessary to use in engineering systems in order to guarantee quality and performance of product. In this paper, design variables are considered as random variables. Standard deviation according to change of design variables have changed as much as coefficient of variation. And, if the standard deviation is error of manufacturing, standard deviation-mean relation is concave form. We obtain reliability index using advanced first order second moment method(AFOSM). This paper is examined by solving two examples and the results are compares with DO, RBDO and suggested RBDO.
Vibration Control of Working Booms on Articulated Bridge Inspection Robots
Hwang, In-Ho ; Lee, Hu-Seok ; Lee, Jong-Seh ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 421~427
A robot crane truck is developed by the Bridge Inspection Robot Development Interface(BRIDI) for an automated and/or teleoperated bridge inspection. This crane truck looks similar to the conventional bucket crane, but is much smaller in size and light-weight. At the end of the telescoping boom which is 12m long, a robot platform is mounted which allows the operator to scan the bridge structure under the deck trough the camera. Boom vibration induced by wind and deck movement can cause serious problems in this scanning system. This paper presents a control system to mitigate such vibration of the robot boom. In the proposed control system, an actuator is installed at the end of the working boom. This control system is studied using a mathematical model analysis with LQ control algorithm and a scaled model test in the laboratory. The study indicates that the proposed system is efficient for the vibration control of the robot booms, thereby demonstrating its immediate applicability in the field.
Progressive Collapse Resisting Capacity of Braced Frames
Kim, Jin-Koo ; Lee, Young-Ho ; Choi, Hyun-Hoon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 429~437
In this study the progressive collapse potential of braced frames were investigated using the nonlinear static and dynamic analyses. All of nine different brace types were considered along with a special moment-resisting frame for comparison. According to the pushdown analysis results, most braced frames designed per current design codes satisfied the design guidelines for progressive collapse initiated by loss of a first story mid-column; however most model structures showed brittle failure mode. This was caused by buckling of columns after compressive braces buckled. Among the braced frames considered, the inverted- V type braced frames showed superior ductile behavior during progressive collapse. The nonlinear dynamic analysis results showed that all the braced frame model structures remained in stable condition after sudden removal of a column, and their deflections were less than that of the moment-resisting frame.
Study on the Dynamic Analysis Based on the Reduced System
Kim, Hyung-Gi ; Cho, Maeng-Hyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 439~450
In this study, the reduced system for the dynamic analysis is proposed and the selection criterion of the primary degrees of freedom is presented considering the relation between natural frequency and external loading frequency. A well-constructed reduced system can assure the accurate representation of the dynamic behavior under arbitrary dynamic loads. For selecting the primary degrees of freedom of the reduced system, we employ the robust two-level condensation scheme of which the reliability has been proven through previous study. In the numerical examples, the reliability of the dynamic analysis based on the reduced system is demonstrated through comparing with those of global system.
Seismic Performance Evaluation of Flat Plate Structures Retrofitted with Steel Plates and Braces
Shin, Woo-Seung ; Kim, Jin-Koo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 451~458
In this study 3- and 6-story flat plate structures designed only for gravity load are retrofitted with steel plates and braces and their seismic performances are evaluated to verify the effect of seismic retrofit. According to the analysis results obtained from nonlinear static and dynamic analyses both the strength and stiffness are significantly enhanced as a result of the seismic retrofit. Especially the effect of column jacketing could be enhanced significantly when slabs were reinforced to prevent premature punching shear failure. When buckling-restrained braces are used instead of conventional braces, the structures showed more ductile behavior, especially in the 3-story structure.
Dynamic Characteristic Analysis of Water Jet Loom Driving System
Kim, Sang-Yoon ; Park, Dae-Kyu ; Chun, Du-Hwan ; Park, Myung-Kyu ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 459~464
While high speed / precision investigating for maximization of Textile Machinery business is requesting a machine which has highly endurance, stability and reliance abilities following customer request. In this research, load volume that gives influence on loom is measured and analyzed for water jet loom in real operation time to driving system adhered torque sensor to each a module. As well, measurement and analysis technology are developed about torque and vibration of driving systems for textile machinery by comparing dynamical analysis of water jet loom with gained result, basic materials about development of high value added textile machinery which has endurance and stability are presented.
Real-time Hybrid Testing a Building Structure Equipped with Full-scale MR dampers and Application of Semi-active Control Algorithms
Park, Eun-Churn ; Lee, Sung-Kyung ; Lee, Heon-Jae ; Moon, Suk-Jun ; Jung, Hyung-Jo ; Min, Kyung-Won ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 465~474
The real-time hybrid testing method(RT-HYTEM) is a structural testing technique in which the numerical integration of the equation of motion for a numerical substructure and the physical testing for an experimental substructure are performed simultaneously in real-time. This study presents the quantitative evaluation of the seismic performance of a building structure installed with an passive and semi-active MR damper by using RT-HYTEM. The building model that was identified from the force-vibration testing results of a real-scaled 5-story building is used as the numerical substructure, and an MR damper corresponding to an experimental substructure is physically tested by using the universal testing machine(UTM). The RT-HYTEM implemented in this study is validated because the real-time hybrid testing results obtained by application of sinusoidal and earthquake excitations and the corresponding analytical results obtained by using the Bouc-Wen model as the control force of the MR damper respect to input currents were in good agreement. Also for preliminary study, some semi-active control algorithms were applied to the MR damper in order to control the structural responses optimally. Comparing between the test results of semi-active control using RT-HYTEM and numerical analysis results show that the RT-HYTEM is more resonable than numerical analysis to evaluate the performance of semi-active control algorithms.
Inelastic Transient Dynamic Analysis of Two- and Three-dimensional Stress Problems by Particular Integral Boundary Element Method
Yun, Seong-Ho ; Ren, Li-Min ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 475~482
This paper indicates that the use of Euler angles lacks in its consistency and exactness of analysis when it was applied to incorporate the rotational equation of motion for rotor systems by previous researcher. Kinetic energy and angular velocity are different from case to case depending on the way of choosing Euler angles and thus only the linear system has been investigated even though the rotor system has a very nonlinear behavior. A new methodology is applied by using both spherical coordinate and quaternion in the rotor rotation to overcome weaknesses of Euler angles and shows its superiority It is found through numerical examples that the use of quaternion will be a more useful and valid tool to derive the numerical model of the rotor system.
Flexural Behaviors of Reinforced Concrete Beams Strengthened with Fiber-Steel Composite Plates
Cho, Baik-Soon ; Kim, Seong-Do ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 483~491
The effectiveness of a new fiber-steel composite plate designed specifically to be used for strengthening of reinforced concrete members has been investigated. Twelve reinforced concrete beams were tested. Seven of the beams were strengthened with carbon fiber-steel composite plate(CSP), four of the beams were strengthened with glass fiber-steel composite plate(GSP), and one beam was used as a control specimen. The experimental results showed that new strengthening system controls the premature debonding and provides a more ductile failure mode than other conventional strengthening systems. The observed ductility ratios were
for strengthened beam with CSP and GSP, respectively. The maximum load was increased by 115% and 107% for strengthened beam with CSP and GSP, respectively, comparing with control beam. In addition, experimental and analytical results were well agreed.
Computation of Nonlinear Elastic Strains Occurring in the Leaflet of the Edwards MIRA Mechanical Heart Valve by the Applied High Blood Pressure
Kwon, Young-Joo ; Yoon, Koo-Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 493~504
This paper presents a computation of nonlinear elastic strains that may occur in the leaflet of the Edwards MIRA mechanical heart valve by the applied high blood pressure using the finite element analysis methodology. By adopting numerical analysis techniques of the commercial finite element analysis code, NISA, structural analyses of the Edwards MIRA mechanical heart valve are performed for the slight variation of leaflet thickness to get the elastic strains occurring in the leaflet while the high blood fluid pressures are applied to the leaflet surface in order that the maximum stress occurring in the leaflet may be less than the yield stress of the leaflet material(Si-Alloyed PyC). And so, only the geometric non-linearity is assumed because large geometric nonlinear elastic strains are expected rather than material nonlinear strains due to the applied high blood pressure. Computed linear and nonlinear elastic strains are compared to make sure the non-linearity of the computed elastic strain. The comparison result shows that large elastic strains occur clearly in the very thin leaflets as high blood pressures are applied. However, only the linear elastic strains occur for low blood pressures, and also for thick leaflets even for the high blood pressures. Hence the nonlinear structural analysis is very required in the structural design of a mechanical heart valve.
Development Strategy for a Facilities Safety Management System Based on NGIS
Kim, Chee-Kyeong ; Hong, Geon-Ho ; Gho, Il-Doo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 505~513
According to "Special law for the safety management of facilities", facilities of group 1 and 2 which are larger than a specified size should be examined periodically by experts. In addition, the other ones not belonging to the group 1 and 2 should be also managed in accordance with "Basic law for the management of disaster and safety" by the facility managers. However, there are many cases that these regulations are not kept in the field of safety management because most of safety management work has been done manually without a formal procedure. The purpose of this research is to develop an facility safety management system based on the National Geographic Information System(NGIS) which can integrates and manages the facility safety management information. The final system integrates the information which is related to several laws and distributed among several organizations.
Ultimate Behavior of High-Tension Bolted Joints Considering Plate Thickness and Bolt Size
Kim, Sung-Bo ; Choi, Jong-Kyoung ; Heo, In-Sung ;
Journal of the Computational Structural Engineering Institute of Korea, volume 21, issue 5, 2008, Pages 515~524
The ultimate behavior of high-tension bolted joints with various plate thickness and bolt size is investigated using nonlinear F.E. analysis and experimental study. The relation with sliding load, bolt deformation, and failure modes are presented based on plate thickness and bolt size. Three kinds of the bolt diameter(M20, M22, M24) and five types of the steel plates (l2mm, 16mm, 20mm, 30mm, 40mm) are considered for the ultimate behavior of the bolted joints. The numerical model, constructed by commercial F.E. program, ABAQUS, of ultimate behavior of bolted joints is introduced and verified by experimental results. The force-displacement and force-axial strain relations are measured and compared with the results by 3D finite element analysis.