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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
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Journal DOI :
The Computational Structural Engineering Institute
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Volume & Issues
Volume 29, Issue 4 - Aug 2016
Volume 29, Issue 3 - Jun 2016
Volume 29, Issue 2 - Apr 2016
Volume 29, Issue 1 - Feb 2016
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On the Derivation of Material Constants Associated with Dynamic Behavior of Heat Formed Plates
Lee, Joo-Sung ; Lim, Hyung-Kyun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 105~114
DOI : 10.7734/COSEIK.2016.29.2.105
When impact load is applied to a plate structure, a common phenomenon that occurs in structures is plastic deformation accompanied by a large strain and eventually it will experience a fracture accordingly. In this study, for the rational design against accidental limit state, the plastic material constants of steel plate which is formed by line heating and by cold bending procedure have been defined through the numerical simulation for the high speed tension test. The usefulness of the material constants included in Cowper-Symonds model and Johnson-Cook model with the assumption that strain rate can be neglected when strain rate is less than the intermediate speed is verified through comparing the present numerical results with those in references. This paper ends with describing the future study.
Improvement in Safety Evaluation of Structures using the Bayesian Updating Approach
Park, Kidong ; Lee, Sangbok ; Kim, Junki ; Rha, Changsoon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 115~122
DOI : 10.7734/COSEIK.2016.29.2.115
The classical statistical approach using test data samples to estimate true value of Random Variables by calculating mean and variation (standard deviation or coefficient of variation) of samples is very useful to understand the existing condition of the structure. But with this classical approach, our prior knowledge through educational background and professional experience cannot provide any benefit to make decisions by the structural engineers. This paper shows the role of Bayesian methodology by providing chance of using valuable prior knowledge to come up with more accurate estimation of structural condition. This paper also shows how important it is to have a proper prior estimate of Random Variables and corresponding confidence level through gathering and studying more relevant information.
A Study on Matching Method of Hull Blocks Based on Point Clouds for Error Prediction
Li, Runqi ; Lee, Kyung-Ho ; Lee, Jung-Min ; Nam, Byeong-Wook ; Kim, Dae-Seok ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 123~130
DOI : 10.7734/COSEIK.2016.29.2.123
With the development of fast construction mode in shipbuilding market, the demand on accuracy management of hull is becoming higher and higher in shipbuilding industry. In order to enhance production efficiency and reduce manufacturing cycle time in shipbuilding industry, it is important for shipyards to have the accuracy of ship components evaluated efficiently during the whole manufacturing cycle time. In accurate shipbuilding process, block accuracy is the key part, which has significant meaning in shortening the period of shipbuilding process, decreasing cost and improving the quality of ship. The key of block accuracy control is to create a integrate block accuracy controlling system, which makes great sense in implementing comprehensive accuracy controlling, increasing block accuracy, standardization of proceeding of accuracy controlling, realizing "zero-defect transferring" and advancing non-allowance shipbuilding. Generally, managers of accuracy control measure the vital points at section surface of block by using the heavy total station, which is inconvenient and time-consuming for measurement of vital points. In this paper, a new measurement method based on point clouds technique has been proposed. This method is to measure the 3D coordinates values of vital points at section surface of block by using 3D scanner, and then compare the measured point with design point based on ICP algorithm which has an allowable error check process that makes sure that whether or not the error between design point and measured point is within the margin of error.
Estimation of Standard Load for Disaster-Resistant Design of Outdoor Signboards
Lee, Sungsu ; Kim, Junyeong ; Ham, Hee Jung ; Kim, Ji Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 131~140
DOI : 10.7734/COSEIK.2016.29.2.131
Recent destructions of outdoor signboards have frequently been caused by strong wind, resulting in damage on the property and human livelihood. One of the major causes of the problems is inadequate implementation of structural design code to the outdoor signboards which are vulnerable to wind. This leads to this paper to present the design guideline of wind-resistant outdoor signboards. In order to estimate the design wind speed, basic wind speeds over Korea suggested by KBC(2015)(revision) are corrected with land surface roughness and topography of the terrain and installation height of the signboard. This paper also suggested the procedure of wind load estimation for different types of outdoor signboards; wall attached type, wall ribbed type and ground erected type. Since the process involves complex calculation to some extent, this paper presents summarized version of wind load estimation from non-professional point of view.
Estimation of Extreme Wind Speeds in Korean Peninsula using Typhoon Monte Carlo Simulation
Lee, Sungsu ; Kim, Ga Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 141~148
DOI : 10.7734/COSEIK.2016.29.2.141
The long-span bridges such as Incheon Bridge and Seohae Grand Bridge are located on the coastal region effected frequently by strong wind of typhoons. In order to ensure the wind-resistant performance of the structure, estimation of the proper design wind speed is very important. In this study, stochastic estimation of design wind speed incurred by typhoons is carried out. For this purpose, we first established probability distribution of climatological parameters such as central pressure depth, distance of closest approach, translation speed and heading to build statistical model of typhoons, which are employed in Monte Carlo simulation for hypothetical typhoons. Once a typhoon is generated with statistically justified parameters, wind speeds are estimated along its path using wind field model. Thousands of typhoons are generated and their peak wind speeds are utilized to establish the extreme wind speeds for different return period. The results are compared with design basic wind speeds in Korean Highway Bridge Design Code, showing that the present results agree well with similar studies while the existing code suggests higher design wind speed.
Evaluating Method of Solitary Wave-Induced Tsunami Force Acting on an Onshore Bridge in Coastal Area
Kim, Do-Sam ; Kyung, Kab-Soo ; Lee, Yoon-Doo ; Woo, Kyung Hwan ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 149~159
DOI : 10.7734/COSEIK.2016.29.2.149
In this study, the solitary wave-induced tsunami force acting on an onshore bridges in coastal area was numerically modelled by means of TWOPM-3D based on Navier-Stokes solver and VOF method which can track free surface effectively. The validity of numerical analysis was verified by comparing the experimental tsunami bore force acting on vertical wall and column structure. In particular, the characteristics of tsunami force with the changing tsunami intensity were surveyed through numerical experiments. The availability of 3-dimensional numerical analysis was reviewed through the comparison between the existing numerical results and design criteria for each drag force coefficient by applying Morison equation considering only drag force. As reasonable and high-precision estimation method of tsunami force, it was suggested to apply the estimation method taking drag and inertial force into consideration at the same time.
Assessment of Impact Resistance Performance of Post-tensioned Curved Wall using Numerical Impact Analysis
Chung, Chul-Hun ; Lee, Jungwhee ; Jung, Raeyoung ; Yu, Tae-Yong ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 161~167
DOI : 10.7734/COSEIK.2016.29.2.161
In this study, the effect of wall curvature and post-tension force on impact resistance is evaluated by numerical analysis method. A total of twelve cases with two parameters such as wall shape of flat and curved, and consideration of post-tensioning force were included in this study. A 3D detailed finite element model of commercial passenger plane engine is utilized as projectile. The depths of penetration and central displacement calculated from the numerical simulations were compared and analysed. As the results of the numerical simulations of this study, penetration depth was reduced approximately 60~80% due to the application of post-tension force, but the decrease of maximum central displacement was not remarkable. Also, the effect of curvature was relatively insignificant.
Comparative Analysis of Track-Bridge Interaction of Sliding Slab Track and Rail Expansion Joint for Long-Span Railway Bridge
Lee, Kyoung Chan ; Jang, Seung Yup ; Lee, Jungwhee ; Choi, Hyun Sung ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 169~177
DOI : 10.7734/COSEIK.2016.29.2.169
Sliding slab track system, which consists of low friction sliding layer between track slab and bridge deck, is recently devised to reduce track-bridge interaction effect of continuously welded rail(CWR) without applying special devices such as rail expansion joint(REJ). In this study, a series of track-bridge interaction analyses of a long-span bridge with sliding slab track and REJ are performed respectively and the results are compared. The bridge model includes PSC box girder bridge with 9 continuous spans, and steel-concrete composite girder bridge with 2 continuous spans. The total length of the bridge model is 1,205m, and the maximum spacing between the two fixed supports is 825m. Analyses results showed that the sliding slab track system is highly effective on interaction reduction since lower rail additional axial stress is resulted than REJ application. Additionally, horizontal reaction forces in fixed supports were also reduced compared to the results of REJ application. However, higher slab axial forces were developed in the sliding slab track due to the temperature load. Therefore, track slab section of the sliding slab track system should be carefully designed against slab axial forces.
Numerical Stability of Serial Staggered Methods in Fluid-Structure Interaction Analysis of Solid Rocket Motors
Cho, Hyun-Joo ; Lee, Jee-Ho ; Lee, Chang-Soo ; Kim, Chong-Am ; Kim, Shin-Hoe ; Lee, Jeong-Sub ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 179~185
DOI : 10.7734/COSEIK.2016.29.2.179
In this paper numerical stability of CSS and ISS schemes in axisymmetric fluid-structure-burning simulation for solid rocket motors are studied. The implemented CSS and ISS algorithms for two-dimensional axisymmetric FSI problems are used to analyze ACM and BCM solid rocket motors. Numerical results from CSS and ISS schemes are compared to investigate the efficacy of ISS scheme over CSS scheme in stabilizing the numerical solution. The ACM and BCM simulation results show that ISS scheme gives stable and converged numerical solutions with appropriately small system time step size, while CSS scheme fails to converge after generating rapidly amplified oscillatory solutions. It is concluded that ISS scheme can be useful in improving the numerical stability of FSI analysis for ACM and BCM solid rocket motor simulations, which is not successfully obtained with CSS scheme.
Pier Stiffness and Bridge Collapse Mechanism
Kook, Seung-Kyu ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 187~192
DOI : 10.7734/COSEIK.2016.29.2.187
While structures are designed within elastic range by other designs, plastic behavior of structures should be verified and controlled in order to prevent structural collapse by the earthquake resistant design. No Collapse Requirement for typical bridges is to avoid falling down of superstructure by way of plastic behavior of certain structural elements and to operate emergency vehicles after earthquake. Such plastic behavior is restricted to connections or pier columns and appropriate measures are required for each case. Earthquake Resistant Design part of Roadway Bridge Design Code provides design processes for Ductile Collapse Mechanism by forming plastic hinges at pier columns. Also for bridges with reinforced concrete piers ductility-based design processes are provided as an appendix constructing Brittle Collapse Mechanism with connection yielding. In this study, a typical bridge with steel bearing connections and reinforced concrete piers is selected and No Collapse Design procedure considering both Ductile and Brittle Collapse Mechanism is proposed together with revisions required for the Earthquake Resistant Design part.
Dynamic Interaction Analysis between Maglev Train with Airgap Control Algorithm Based on Acceleration Feedback and Guideway
Lee, Jin Ho ; Kim, Sung Il ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 193~199
DOI : 10.7734/COSEIK.2016.29.2.193
Since the variations of electromagnetic suspension forces of maglev trains have close relations with the acceleration of the levitated bodies, it is basic to control the levitation forces using the measured acceleration of vehicles. In this study, an airgap control algorithm based on acceleration feedback is applied to maglev trains and a dynamic analysis method is developed considering maglev train-guideway interaction. Using the developed method, dynamic behaviors of a maglev train-guideway interaction system are investigated. It is observed from the analysis that the current design guidelines can be satisfied when the proposed airgap control algorithm is employed. Using the contorl algorithm, the current guidelines can be improved and economical maglev railway guideway structures can be designed.
Simulation of Multi-Cracking in a Reinforced Concrete Beam by Extended Finite Element Method
Yoo, Hyun-Suk ; Kim, Han-Soo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 29, issue 2, 2016, Pages 201~208
DOI : 10.7734/COSEIK.2016.29.2.201
Recently, extensive research on crack analysis using extended finite element method(XFEM) which has main advantages in element re-meshing and visualization of cracks has been conducted. However, its application was restricted to the members of a single material. In this study, the applicability and feasibility of the XFEM to the multiple crack analysis of reinforced concrete beams were demonstrated. ABAQUS which has implemented XFEM was used for the crack analysis and its results were compared with test results. Enriched degree-of-freedom locking phenomenon was discovered and its causes and the ways to prevent it were suggested. The locking occurs when cracks in the adjacent elements simultaneously develop. A modelling technique for multiple cracking similar to test results was also proposed. The analysis with XFEM showed similar results to the tests in terms of crack patterns, spacing of cracks, and load-deflection relationship.