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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 28, Issue 6 - Dec 2015
Volume 28, Issue 5 - Oct 2015
Volume 28, Issue 4 - Aug 2015
Volume 28, Issue 3 - Jun 2015
Volume 28, Issue 2 - Apr 2015
Volume 28, Issue 1 - Feb 2015
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A Finite Element Based PML Method for Time-domain Electromagnetic Wave Propagation Analysis
Yi, Sang-Ri ; Kim, Boyoung ; Kang, Jun Won ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 123~130
DOI : 10.7734/COSEIK.2015.28.2.123
This paper presents a new formulation for transient simulations of microwave propagation in heterogeneous unbounded domains. In particular, perfectly-matched-layers(PMLs) are introduced to allow for wave absorption at artificial boundaries used to truncate the infinite extent of the physical domains. The development of the electromagnetic PML targets the application to engineering mechanics problems such as structural health monitoring and inverse medium problems. To formulate the PML for plane electromagnetic waves, a complex coordinate transformation is introduced to Maxwell's equations in the frequency-domain. Then the PML-endowed partial differential equations(PDEs) for transient electromagnetic waves are recovered by the application of the inverse Fourier transform to the frequency-domain equations. A mixed finite element method is employed to solve the time-domain PDEs for electric and magnetic fields in the PML-truncated domain. Numerical results are presented for plane microwaves propagating through concrete structures, and the accuracy of solutions is investigated by a series of error analyses.
Structural Responses of Composite-girder Bridges Due to Design Live Loads using Distribution Factor Method and Grillage Analysis
Jung, Myung-Rag ; Yang, Hee-Sun ; Kim, Moon-Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 131~138
DOI : 10.7734/COSEIK.2015.28.2.131
In this paper, the modified live-load and designed formula are studied according to the fact the highway bridge design specifications are recently revised. The two examples for composite steel plates and PSC girder bridges are studied. The envelope is analyzed with the finite element models and lateral load distribution method applying the existing highway bridge specification(2010), the newly revised highway bridge specification(2015) and AASHTO LRFD. In case of composite steel plates, length changes between spans are studied, and in case of PSC girder. changes of the number of cross-beams and spans, and span-lengths, are analyzed.
Numerical Analysis and Verification of Sound Absorbing Properties of Perforated Plate
Yoon, Gil-Ho ; Kim, Ki-Hyun ; Choi, Jung-Sik ; Yun, Su-Hwan ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 139~144
DOI : 10.7734/COSEIK.2015.28.2.139
Recently, to realize sound-absorbing structures, we have to insert sound-absorbing materials into wall. These shapes are taken limitations because sound-absorbing materials should be fixed. Therefore, the sound absorption is changed by environment that used the sound-absorbing materials. On the other hand, we will take same effect without sound-absorbing material, if we change the shape of wall to sound absorbing structure. If we use this sound absorbing structure, we can get benefits by removing limitation of materials. Therefore we suggest perforated plate for effective sound-absorbing structure. We confirmed the function of sound-absorption of this structure using equivalent property. Then, we found the similarity between perforated plate and resonator. Also, we verify these theories through computer simulation by FEM(Finite Element Method). Finally, we validated that perforated plate has function of sound absorption without sound-absorbing material. This perforated plate is used for sound-absorbing material of buildings and transportations such as vehicle, train etc. Also, these results could be further used basic tool for design of sound-absorption structure.
Optimization Design of Damping Devices for a Super-Tall Building Using Computational Platform
Joung, Bo-Ra ; Lee, Sang-Hyun ; Chung, Lan ; Choi, Hyun-Chul ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 145~152
DOI : 10.7734/COSEIK.2015.28.2.145
In the study, the effects of damping devices on damping ratio increase and wind-load reduction were investigated based on the computational platform, which is one of the parametric modeling methods. The computational platform helps the designers or engineers to evaluate the efficacy of the numerous alternative structural systems for irregular Super-Tall building, which is crucial in determining the capacity and the number of the supplemental damping devices for adding the required damping ratios to the building. The inherent damping ratio was estimated based on the related domestic and foreign researches conducted by using real wind-load records. Two types of damping devices were considered: One is inter-story installation type passive control devices and the other is mass type active control devices. The supplemental damping ratio due to the damping devices was calculated by means of equivalent static analysis using an equation suggested by FEMA. The optimal design of the damping devices was conducted by using the computational platform. The structural element quantity reduction effect resulting from the installation of the damping devices could be simply assessed by proposing a wind-load reduction factor, and the effectiveness of the proposed method was verified by a numerical example of a 455m high-rise building. The comparison between roof displacement and the story shear forces by the nonlinear time history analysis and the proposed method indicated that the proposed method could simply but approximately estimate the effects of the supplemental damping devices on the roof displacement and the member force reduction.
Correlation Analysis of Aerodynamic Forces acting on Tall Buildings with Various Side Ratios
Kim, Wonsul ; Yoshida, Akihito ; Tamura, Yukio ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 153~160
DOI : 10.7734/COSEIK.2015.28.2.153
The objective of this study is to construct the TPU aerodynamic database with wind tunnel test data of overall wind loads and responses on tall buildings. In this study, wind tunnel tests were conducted to investigate characteristics of wind forces and the effect of wind load combination by cross-correlation analysis among along-wind overturning moment, across-wind overturning moment and torsional moment on a tall building with various side ratios(D/B=0.33, 0.50, 0.77, 0.83, 0.91, 1.0, 1.1, 1.2, 1.3, 2.0 and 3.0) for different terrain roughnesses. The results of wind tunnel tests were compared with those of past literatures. As a result, there was no significant effects of changing of terrain roughnesses on moment coefficients and power spectral densities of across-wind overturning moment coefficients and torsional moment coefficients with various side ratios. Further, these results were good agreement with those of past literatures. From cross-correlation analysis, the across-wind overturning moment coefficients were highly correlated with the torsional moment coefficients. The results of this study will be helpful for practical designers in preliminary design stage.
Evaluation of Characteristics on Negative Reactions of Simply Supported Curved Box Girder Bridges with Elastomeric Bearings
Kim, Kyungsik ; Lee, Heejeong ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 161~168
DOI : 10.7734/COSEIK.2015.28.2.161
Horizontally curved bridges are subjected to torsional loads by their vertical dead loads only as well as eccentric loads, which cause negative reactions at supports. In this paper, effects of bridge curvature on vertical reactions at supports are investigated for 48.8 m length simple span steel box girder bridges with elastomeric bearings by varying curvature angle from 0.49 to 1.35 rad. In order to expect magnitude and direction of reactions including possibility of negative reactions, reaction evaluation equations have been analytically developed by separating a superstructure of curved bridge into independent components. Concrete slabs and bottom flanges in steel box section are assumed geometrical annular sectors in area dimension, and top flanges and webs that have very narrow projected areas are assumed geometrical arcs in line dimension. Proposed equations have relatively simple forms and prediction values are on very good agreement with those from finite element analyses by difference of 1% order.
Damage Evaluation for the Column of Underpass Considering the Collision of a Vehicle
Park, Jang Ho ; Kim, Young Woong ; Park, Jaegyun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 169~176
DOI : 10.7734/COSEIK.2015.28.2.169
The protection facilities against the collision of the vehicle should be considered in the design of the bridge by the regulations, but there is no regulation against the collision of the vehicle in the design of the column of underpass. Impact analysis for the column of underpass was performed in order to evaluate the damage of the structure by the collision of the vehicle. Impact analysis was performed according to the various parameters such as material properties of the structure and types and velocities of the vehicle. From the numerical results, the structural damage for the column of underpass by the collision of the vehicle was evaluated and considerations in the design for a column of underpass against the collision of the vehicle were examined.
Visualization Technology of GIS Associated with Seismic Fragility Analysis of Buried Pipelines in the Domestic Urban Area
Lee, Jinhyuk ; Cha, Kyunghwa ; Song, Sangguen ; Kong, Jung Sik ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 177~185
DOI : 10.7734/COSEIK.2015.28.2.177
City-based Lifeline is expected to cause significant social and economic loss accompanied the secondary damage such as paralysis of urban functions and a large fire as well as the collapse caused by earthquake. Earthquake Disaster Response System of Korea is being operated with preparation, calculates the probability of failure of the facility through Seismic Fragility Model and evaluates the degree of earthquake disaster. In this paper, the time history analysis of buried gas pipeline in city-based lifeline was performed with consideration for ground characteristics and also seismic fragility model was developed by maximum likelihood estimation method. Analysis model was selected as the high-pressure pipe and the normal-pressure pipe buried in the city of Seoul, Korea's representative, modeling of soil was used for Winkler foundation model. Also, method to apply developed fragility model at GIS is presented.
Dynamic Response of Plate Structure Subject to the Characteristics of Explosion Load Profiles - Part A: Analysis for the Explosion Load Characteristics and the Effect of Explosion Loading Rate on Structural Response -
Kang, Ki-Yeob ; Choi, Kwang-Ho ; Ryu, YongHee ; Choi, JaeWoong ; Lee, Jae-Myung ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 187~195
DOI : 10.7734/COSEIK.2015.28.2.187
The gas explosions in offshore installations are known to be very severe according to its geometry and environmental conditions such as leak locations and wind directions, and a dynamic response of structures due to blast loads depends on the load profile. Therefore, a parametric study has to be conducted to investigate the effects of the dynamic response of structural members subjected to various types of load shapes. To do so, a series of CFD analyses was performed using a full-scale FPSO topside model including detail parts of pipes and equipments, and the time history data of the blast loads at monitor points and panels were obtained by the analyses. In this paper, we focus on a structural dynamic response subjected to blast loads changing the magnitude of positive/negative phase pressure and time duration. From the results of linear/nonlinear transient analyses using single degree of freedom(SDOF) and multi-degree-of freedom(MDOF) systems, it was observed that dynamic responses of structures were significantly influenced by the magnitude of positive and negative phase pressures and negative time duration.
Dynamic Response of Plate Structure Subject to the Characteristics of Explosion Load Profiles - Part B: Analysis for the Effect of Explosion Loading Time According to the Natural Period for Target Structures -
Kang, Ki-Yeob ; Choi, Kwang-Ho ; Ryu, YongHee ; Choi, JaeWoong ; Lee, Jae-Myung ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 197~205
DOI : 10.7734/COSEIK.2015.28.2.197
Offshore structures for the gas production are exposed to the risk of gas leaks, and gas explosions can result in fatal damages to the primary structures as well as secondary structures. To minimize the damage from the critical accidents, the study of the dynamic response of structural members subjected to blast loads must be conducted. Furthermore, structural dynamic analysis has to be performed considering relationships between the natural frequency of structural members and time duration of the explosion loading because the explosion pressure tends to increase and dissipate within an extremely short time. In this paper, the numerical model based on time history data were proposed considering the negative phase pressure in which considerable negative phase pressures were observed in CFD analyses of gas explosions. The undamped single degree of freedom(SDOF) model was used to characterize the dynamic response under the blast loading. A blast wall of FPSO topside was considered as an essential structure in which the wall prevents explosion pressures from the process area to utility and working areas. From linear/nonlinear transient analyses using LS-DYNA, it was observed that dynamic responses of structures were influenced by significantly the negative time duration.
Arrangement of Connections and Piers and Earthquake Resistant Capacity of Typical Bridges
Kook, Seung-Kyu ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 207~212
DOI : 10.7734/COSEIK.2015.28.2.207
Bridges are designed and constructed as infrastructures in order to overcome topographical obstructions for fast and smooth transfer of human/material resources. Therefore the shape and size of piers constructed along the longitudinal bridge axis should be restricted by topographical conditions. Action forces of connections and piers are affected by pier shapes and sizes together with connection arrangement which decides load carrying path under earthquakes. In this study a typical bridge is modelled with steel bearings and reinforced concrete piers and seismic analyses are performed with analysis models with different arrangement of steel bearings and piers. From analysis results ductile failure mechanisms for all analysis models are checked based on strength/action force ratios of steel bearings and pier columns. In this way the influences of arrangement of connections and piers on the earthquake resistant capacity of typical bridges are figured out in view of forming ductile failure mechanism.
An Improved Bond Slip Model of CFT Columns for Nonlinear Finite Element Analysis
Kwon, Yangsu ; Kwak, Hyo-Gyoung ; Hwang, Ju-Young ; Kim, Jin-Kook ; Kim, Jong-Min ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 2, 2015, Pages 213~220
DOI : 10.7734/COSEIK.2015.28.2.213
CFT column has a lot of structural advantages due to the composite behavior between in-filled concrete and steel tube. This paper deals with the development of an effective numerical model which can consider the bond-slip behavior between both components of concrete matrix and steel tube without taking double nodes. Since the applied axial load to in-filled concrete matrix is delivered to steel tube by the confinement effect and the friction, the governing equation related to the slip behavior can be constructed on the basis of the force equilibrium and the compatability conditions. In advance, the force and displacement relations between adjacent two nodes make it possible to express the slip behavior with the concrete nodes only. This model results in significant savings in the numerical modeling of CFT columns to take into account the effect of bond-slip. Finally, correlation studies between numerical results and experimental data are conducted to verifying the efficiency of the introduced numerical model.