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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 27, Issue 6 - Dec 2014
Volume 27, Issue 5 - Oct 2014
Volume 27, Issue 4 - Aug 2014
Volume 27, Issue 3 - Jun 2014
Volume 27, Issue 2 - Apr 2014
Volume 27, Issue 1 - Feb 2014
Selecting the target year
Seismic Performance Evaluation of Steel Intermediate Moment Frames with Different Heights
Kim, Dong Hwi ; Park, Yu Jin ; Han, Sang Whan ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 215~222
DOI : 10.7734/COSEIK.2014.27.4.215
The objective of this research is to evaluate the seismic performance of steel intermediate moment frames(IMFs) with different heights. The seimic performance is conducted according to ATC-63. Three-, six, nine- and twelve-story IMFs are designed according to KBC 2009. The connection is modeled to have a drift capacity of 0.02rad, which is required for IMF connections. This study shows that the probability of collapse increases with an increase in the height of the frame. Nine- and twelve-story frames did not satisfy the requirement specified in ATC-63.
A Study on the Wind-Induced Response Characteristics of Freeform Shaped Tall Building using FSI Analysis
Park, Sung Chul ; Kim, Hyo Jin ; Han, Sang Eul ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 223~230
DOI : 10.7734/COSEIK.2014.27.4.223
In this paper, the wind-induced response characteristics of freeform shaped tall building is studied by using FSI analysis. The analytical models are twist shaped ones at representing type of atypical tall building, and this study focused on the relationship between twist angle and wind acceleration. Firstly, 1-way FSI analysis is performed, so maximum lateral displacement of the analytical model for 100 years return period wind speed is calculated, then the elastic modulus of a structure that satisfies the constraints condition is evaluated. And 2-way FSI analysis is carried out. so acceleration of the analytical model for the evaluated modulus of elasticity and arbitrary density is predicted through time history analysis. The basic model is a set of a square shape, height is 400m, slenderness ratio is 8, and twist model is rotated at square model from 0 to 90 degrees at intervals of 15 degrees and from 90 to 360 degrees at intervals of 90 degrees. According to the result of predicting wind acceleration by the shape of each model, the wind vibration effect of square shape model is confirmed to be sensitive more than a twist shape ones.
An Analytical Study on System Identification of Steel Beam Structure for Buildings based on Modified Genetic Algorithm
Oh, Byung-Kwan ; Choi, Se-Woon ; Kim, Yousok ; Cho, Tong-Jun ; Park, Hyo-Seon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 231~238
DOI : 10.7734/COSEIK.2014.27.4.231
In the buildings, the systems of structures are influenced by the gravity load changes due to room alteration or construction stage. This paper proposes a system identification method establishing mass as well as stiffness to parameters in model updating process considering mass change in the buildings. In this proposed method, modified genetic algorithm, which is optimization technique, is applied to search those parameters while minimizing the difference of dynamic characteristics between measurement and FE model. To search more global solution, the proposed modified genetic algorithm searches in the wider search space. It is verified that the proposed method identifies the system of structure appropriately through the analytical study on a steel beam structure in the building. The comparison for performance of modified genetic algorithm and existing simple genetic algorithm is carried out. Furthermore, the existing model updating method neglecting mass change is performed to compare with the proposed method.
Periodic Mesh Generation for Composite Structures using Polyhedral Finite Elements
Sohn, Dongwoo ; Park, Jong Youn ; Cho, Young-Sam ; Lim, Jae Hyuk ; Lee, Haengsoo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 239~245
DOI : 10.7734/COSEIK.2014.27.4.239
Finite element modeling of composite structures may be cumbersome due to complex distributions of reinforcements. In this paper, an efficient scheme is proposed that can generate periodic meshes for the composite structures. Regular meshes with hexahedral finite elements are first prepared, and the elements are then trimmed to fit external surfaces of reinforcements in the composite structures. The trimmed hexahedral finite elements located at interfaces between the matrix and the reinforcements correspond to polyhedral finite elements, which allow an arbitrary number of nodes and faces in the elements. Because the trimming process is consistently conducted by means of consistent algorithms, the elements of the reinforcements are automatically compatible with those of the matrices. With the additional consideration of periodicity of reinforcements in a representative volume element(RVE), the proposed scheme provides periodic meshes in an efficient manner, which are compatible for each pair of periodic boundaries of the RVE. Therefore, periodic boundary conditions for the RVE are enforced straightforwardly. Numerical examples demonstrate the effectiveness of the proposed scheme for finite element modeling of complex composite structures.
Comparison of Shear Strength Equation for Flat Plates with GFRP Plate
Kim, Min Sook ; Hwang, Seung Yeon ; Kim, Heecheul ; Lee, Young Hak ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 247~254
DOI : 10.7734/COSEIK.2014.27.4.247
In this study, shear test performed to investigate the shear behavior of flat plate that reinforced by embedded GFRP(glass fiber reinforced polymer) plate with openings. Shape of the GFRP shear reinforcement is a plate with several openings to ensure perfect integration with concrete. The test parameters include the distance between the column face and the first line of GFRP plate and number of GFRP plate vertical strip. The result of test showed that when number of GFRP plate vertical strip was increased, shear strength improved. The shear strength for flat plate reinforced GFRP plate in various codes including ACI 318, BS 8110, EUROCODE 2, and KCI were compared to provide more rational approach for reinforced concrete flat plates with GFRP plate.
Seismic Fragility Analysis of Lightning Arrester using Capacity Spectrum Method
Kim, Gwang-Jeon ; Song, Jong-Keol ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 255~263
DOI : 10.7734/COSEIK.2014.27.4.255
In this paper, seismic fragility analysis of lightning arrester is performed using capacity spectrum method(CSM). Since seismic fragility analysis of structure with many structural members is required to calculate many inelastic responses for several tens or hundreds of ground motions, simple method such as CSM is more appropriate than response history analysis(RHA). In general, accuracy of seismic response evaluated by CSM is less than that by RHA. In order to increase accuracy of CSM, equivalent SDOF method and performance point calculation technique are applied to CSM. Seismic fragility method proposed by Shinozuka et al. is used. In order to evaluate site effect of ground motions on seismic fragility, 60 different site classification earthquakes are selected as input ground motions. From the seismic fragility curves of lightning arrester evaluated by CSM and RHA, it can be observed that the seismic fragility curves evaluated by CSM are very similar to those by RHA. Also, it can be observed that main seismic failure mode of lightning arrest is bushing breakage.
Numerical Simulation of Membrane of LNG Insulation System using User Defined Material Subroutine
Kim, Jeong-Hyeon ; Kim, Seul-Kee ; Kim, Myung-Soo ; Lee, Jae-Myung ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 265~271
DOI : 10.7734/COSEIK.2014.27.4.265
304L stainless steel sheets are used as a primary barrier for the insulation of membrane-type liquefied natural gas(LNG) carrier cargo containment system. 304L stainless steel is a transformation-induced-plasticity(TRIP) steel that exhibits complex material behavior, because it undergoes phase transformation during plastic deformation. Since the TRIP behavior is very important mechanical characteristics in a low-temperature environment, significant amounts of data are available in the literature. In the present study, a uniaxial tensile test for 304L stainless steel was performed to investigate nonlinear mechanical characteristics. In addition, a viscoplastic model and damage model is proposed to predict material fractures under arbitrary loads. The verification was conducted not only by a material-based comparative study involving experimental investigations, but also by a structural application to the LNG membrane of a Mark-III-type cargo containment system.
Effects of Turbulence Intensities on Wake Models of Horizontal Wind Turbines
Lee, Seung-Ho ; Jeong, Houi-Gab ; Kwon, Soon-Duck ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 273~279
DOI : 10.7734/COSEIK.2014.27.4.273
In this paper, wind tunnel tests of a scaled wind turbine have been performed to investigate the effects of turbulent intensity of oncoming flow on turbine wake field. The scaled turbine model was carefully designed to satisfy the similarity conditions. The wind velocities and turbulent intensities were measured using hotwire anemometer in order to compare with existing wake model. It was found from the tests that the existing wake models well fit with test results at turbulent flow rather than at uniform flow. Finally modified wake model has been proposed based on the measured data.
The Effect of Negative Pressure Phase in Blast Load Profile on Blast Wall of Offshore Plant Topside
Kang, Ki-Yeob ; Choi, Kwang-Ho ; Ryu, Yong-Hee ; Choi, Jae-Woong ; Lee, Jae-Myung ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 281~288
DOI : 10.7734/COSEIK.2014.27.4.281
As a gas explosion is the most fatal accident in shipbuilding and offshore plant industries, all safety critical elements on the topside of offshore platforms should retain their integrity against blast pressure. Even though many efforts have been devoted to develop blast-resistant design methods in the offshore engineering field, there still remain several issues needed to be carefully investigated. From a procedure for calculation of explosion design pressure, impulse of a design pressure model having completely positive side only is determined by the absolute area of each obtained transient pressure response through the CFD analysis. The negative pressure phase in a general gas explosion, however, is often quite considerable unlike gaseous detonation or TNT explosion. The main objective of this study is to thoroughly examine the effect of the negative pressure phase on structural behavior. A blast wall for specific FPSO topside is selected to analyze structural response under the blast pressure. Because the blast wall is considered an essential structure for blast-resistant design. Pressure time history data were obtained by explosion simulations using FLACS, and the nonlinear transient finite element analyses were performed using LS-DYNA.
Development of 3-Dimensional Rebar Detail Design and Placing Drawing System
Choi, Hyun-Chul ; Lee, Yunjae ; Lee, Si Eun ; Kim, Chee Kyeong ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 289~296
DOI : 10.7734/COSEIK.2014.27.4.289
The rebar detailing is an important work influencing the final performance and quality of RC structures. But it is one of the most irrational and illogical activity in construction site. Many groups of workers, including main contractors, structural engineers, shop drawers, rebar fabricators, and etc., participate in this activity. A loosely-organized process for this activity is apt to produce a big amount of rebar loss or even degraded structures. A 3-dimensional rebar auto-placing system, called as Rebar Hub, has been designed and implemented in this research. Rebar Hub provides a totally integrated service from 3D structural modeling of buildings to rebar auto-placing considering anchorage, splice, and the length of ordered rebar. In addition, Rebar Hub can recognize the 2D drawing CAD files and then build 3D structural models which are used for the start point of 3D rebar auto-placing. After rebar auto-placing, each members of the 3D structural model have rebar information belonging to them. It means that the rebar information can be used for the afterward works such as quantity-survey, manufacturing and fabrication of rebars. Rebar Hub is showing outstanding performance while applying to practical projects. It has almost five times productivity and reduces the rebar loss up to 3~8% of the initially-surveyed amount of rebar.
Shape Design Sensitivity Analysis of Dynamic Crack Propagation Problems using Peridynamics and Parallel Computation
Kim, Jae-Hyun ; Cho, Seonho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 297~303
DOI : 10.7734/COSEIK.2014.27.4.297
Using the bond-based peridynamics and the parallel computation with binary decomposition, an adjoint shape design sensitivity analysis(DSA) method is developed for the dynamic crack propagation problems. The peridynamics includes the successive branching of cracks and employs the explicit scheme of time integration. The adjoint variable method is generally not suitable for path-dependent problems but employed since the path of response analysis is readily available. The accuracy of analytical design sensitivity is verified by comparing it with the finite difference one. The finite difference method is susceptible to the amount of design perturbations and could result in inaccurate design sensitivity for highly nonlinear peridynamics problems with respect to the design. It turns out that
-continuous volume fraction is necessary for the accurate evaluation of shape design sensitivity in peridynamic discretization.
Comparison and Evaluation of Current Strut-and-Tie Design Provisions for Reinforced Concrete Deep Beams
Kim, Jin Woo ; Hong, Sung-Gul ; Lee, Young Hak ; Kim, Heecheul ; Kim, Dae-Jin ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 305~312
DOI : 10.7734/COSEIK.2014.27.4.305
The current American Concrete Institute(ACI), Canadian Standard Associate(CSA) and CEB-FIP Model Code 2010 provisions on the shear strength of a simply supported deep beam suggest that deep beams should be designed using the strut-and-tie model. Although this is a useful methodology to design members in disturbed regions, the quality of the design is highly dependent on the truss model that designers create. However, Hong et al. derived the shear strength equations of reinforced concrete deep beams. This thesis investigates the validity of the current ACI, CSA and CEB-FIP code provisions on the shear strength of simply supported reinforced concrete deep beams by comparing them with the shear strength equations proposed by Hong et al. The comparison shows that all of these code provisions provide reasonable estimates on the shear strength of concrete deep beam members and the selection of an internal truss model plays an important role on the estimation of shear strength.
A Comparison of the Form-Finding Method of Tensegrity Structures
Lee, Seunghye ; Lee, Jaehong ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 313~320
DOI : 10.7734/COSEIK.2014.27.4.313
A tensegrity structure consists of a set of continuous cables in tension and a set of discontinuous struts in compression. The tensegrity structure can be classified into self-stressed and pre-stressed pin-jointed structure. A key step in the design of tensegrity structures is the determination of their equilibrium configuration, known as form-finding. In this paper, three effective methods are presented for form-finding of tensegrity structures. After performing form-finding process, a set of force density and corresponding topology results can be obtained. Then the force density method combined with a genetic algorithm is adopted to uniquely define a single integral feasible set of force densities. Numerical examples are presented that demonstrate the excellent performance of the algorithms.
Generation of Open City Information Model for Disaster Prevention
Park, Sang Il ; Song, Min Sun ; Jang, Young-Hoon ; Seo, Kyung-Wan ; Lee, Sang-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 27, issue 4, 2014, Pages 321~328
DOI : 10.7734/COSEIK.2014.27.4.321
Clear understanding and related information management of geography and city facilities are the fundamental approach to prevent city disaster. In order to accomplish the service to prevent city disaster effectively, there needs to be a consistent framework for data collection, to build models, and to manage information. In this study, the authors proposed standardized city information modeling process and application concept to use information model for service of preventing city disaster in information management standpoint. The study was conducted on the process of classification and necessary attributes to manage city facilities effectively considering disaster related information. Additionally, the study suggested the methods for building an open city information model based on an integrated data schema, CityGML. Finally, through the implementation of sample model, the study confirmed city information modeling methodology and applicability for service of disaster prevention.