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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 20, Issue 6 - Dec 2007
Volume 20, Issue 5 - Oct 2007
Volume 20, Issue 4 - Aug 2007
Volume 20, Issue 3 - Jun 2007
Volume 20, Issue 2 - Apr 2007
Volume 20, Issue 1 - Feb 2007
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ANN-Based Real-Time Damage Detection Technique Using Acceleration Signals in Beam-Type Structures
Park, Jae-Hyung ; Lee, Yong-Hwan ; Kim, Jeong-Tae ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 229~237
In this study, an artificial neural network (ANN)-based damage detection algorithm using acceleration signals is developed for real-time alarming locations of damage in beam-type structures. A new ANN-algorithm using output-only acceleration responses is designed tot damage detection in real time. The cross-covariance of two acceleration-signals measured at two different locations is selected as the feature representing the structural condition. Neural networks are trained lot potential loading Patterns and damage scenarios of the target structure for which its actual loadings are unknown. The feasibility and practicality of the proposed method are evaluated from laboratory-model tests on free-free beams for which accelerations were measured before and after several damage cases.
New Equivalent Static Analysis Method of Dynamic Behavior during Progressive Collapse
Kim, Chee-Kyeong ; Lee, Jae-Cheol ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 239~246
In this paper a new equivalent static analysis method of dynamic behavior during progressive collapse is presented. The proposed analysis method uses the equivalent nodal load for the element stiffness which represents the dynamic behavior influence caused by the deletion of elements during progressive collapse analysis. The proposed analysis method improves the efficiency of progressive collapse analysis haying the iterative characteristic because the inverse of the structural stiffness matrix is roused in the reanalysis. By comparing the results obtained by this analysis method with those of GSA code analysis and time history analysis, it is shown that the results obtained by this analysis method more closely approach to those of time history analysis than by GSA code analysis.
Dimensionality Reduced Wave Transmission Function and Neural Networks for Crack Depth Estimation in Concrete Structures
Shin, Sung-Woo ; Yun, Chung-Bang ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 247~253
Determination of crack depth in filed using the self-calibrating surface wane transmission measurement and the cutting frequency in the transmission function (TRF) is very difficult due to variations of the measurement conditions. In this study, it is proposed to use the measured full TRF as a feature for crack depth assessment. A Principal component analysis (PCA) is employed to generate a basis of the measured TRFs for various crack cases. The measured TRFs are represented by their projections onto the most significant principal components. Then artificial neural networks (NNs) using the PCA-compressed TRFs is applied to assess the crack in concrete. Experimental study is carried out for five different crack cases to investigate the effectiveness of the proposed method. Results reveal that the proposed method can be effectively used for the crack depth assessment of concrete structures.
Development of Capacity Spectrum Method for Shear Building to Estimate the Maximum Story Drift
Kim, Sun-Pil ; Kim, Doo-Kie ; Kwak, Hyo-Gyoung ; Ko, Sung-Hyuk ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 255~264
In the current domestic and overseas standards concerning seismic design, especially on the capacity & demand spectra in the multi-story building, failure is caused more by story drift than by displacement; and the existing capacity spectrum method (CSM) does not make a close estimate of story drift because response is derived using displacement. Therefore, this paper proposes an improved CSM to estimate story drift and its direct effect on the collapse of structures, yet still maintaining the same advantage and convenience of the existing CSM about a most basic model of multi-story building: shear building. To establish its reliability, the proposed method is applied to an example model and results are then compared with those obtained through nonlinear time-history analysis.
Buckling Analysis of Box-typed Structures using Adaptive Shell Finite Elements
Song, Myung-Kwan ; Kim, Sun-Hoon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 265~272
The finite element linear buckling analysis of folded plate structures using adaptive h-refinement methods is presented in this paper. The variable-node flat shell element used in this study possesses the drilling D.O.F. which, in addition to improvement of the element behavior, permits an easy connection to other elements with six degrees of freedom per node. The Box-typed structures can be analyzed using these developed flat shell elements. By introducing the variable-node elements some difficulties associated with connecting the different layer patterns, which are common in the adaptive h-refinement on quadrilateral mesh, can be overcome. To obtain better stress field for the error estimation, the super-convergent patch recovery is used. The convergent buckling modes and the critical loads associated with these modes can be obtained.
Risk Assessment for a Steel Arch Bridge System Based upon Response Surface Method Compared with System Reliability
Cho, Tae-Jun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 273~279
Probabilistic Risk Assessment considering statistically random variables is performed for the preliminary design of an Arch Bridge. Component reliabilities of girders have been evaluated using the response surfaces of the design variables at the selected critical sections based on the maximum shear and negative moment locations. Response Surface Method (RSM) is successfully applied for reliability analyses lot this relatively small probability of failure of the complex structure, which is hard to be calculated by Monte-Carlo Simulations or by First Order Second Moment method that can not easily calculate the derivative terms in implicit limit state functions. For the analysis of system reliability, parallel resistance system composed of girders is modeled as a parallel series connection system. The upper and lower probabilities of failure for the structural system have been evaluated and compared with the suggested prediction method for the combination of failure modes. The suggested prediction method for the combination of failure modes reveals the unexpected combinations of element failures in significantly reduced time and efforts, compared with the previous permutation method or conventional system reliability analysis method.
Load Balancing Algorithm for Parallel Computing of Design Problem involving Multi-Disciplinary Analysis
Cho, Jae-Suk ; Chu, Min-Sik ; Song, Yong-Ho ; Choi, Dong-Hoon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 281~286
An engineering design problem involving Multi-Disciplinary Analysis(MDA) generally requires a large amounts of computing time for the entire design process, and therefore it is essential to introduce a Multiple Processor System (MPS) for reducing the computing time. However, when applying conventional parallel processing techniques, all of the CAE S/W requited for the MDA should be installed on all the servers making up MPS because of characteristic of MDA and it would be a great expense in CAE S/W licenses. To solve this problem, we propose a Weight-based Multiqueue Load Balancing algorithm for a heterogeneous MPS where performance of servers and CAE S/W installed on each server are different of each other. To validate the performance, a Computational experiments comparing the First Come First Serve algorithm and our proposed algorithm was accomplished.
Multi-scale Analysis of Thin film Considering Surface Effects
Cho, Maeng-Hyo ; Choi, Jin-Bok ; Jung, Kwang-Sub ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 287~292
In general, the response of bulk material is independent of its size when it comes to considering classical elasticity theory. Because the surface to bulk ratio of the large solids is very small, the influence of surface can be negligible. But the surface effect plays important role as the surface to bulk ratio becomes larger, that is, the contribution of the surface effect must be considered in nano-size elements such as thin film or beam structure. Molecular dynamics computation has been a conventional way to analyze these ultra-thin structures but this method is limited to simulate on the order of
atoms for a few nanoseconds, and besides, very time consuming. Analysis of structures in submicro to micro range(thin-film, wire etc.) is difficult with classical molecular dynamics due to the restriction of computing resources and time. Therefore, in this paper, the continuum-based method is considered to simulate the overall physical and mechanical properties of the structures in nano-scale, especially, for the thin-film.
A New Global-Local Analysis Using MLS(Moving Least Square Variable-Node Finite Elements
Lim, Jae-Hyuk ; Im, Se-Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 293~301
We present a new global-local analysis with the aid of MLS(Moving Least Square) variable-node finite elements which can possess an arbitrary number of nodes on element master domain. It enables us to connect one finite element with a few finite elements without complex remeshing. Compared to other type global-local analysis, it does not require any superimposed mesh or need not solve the equilibrium equation twice. To demonstrate the performance of the proposed scheme, we will show several examples in relation to capturing highly local stress field using global-local analysis.
Finite Element Analysis with Paraxial Boundary Condition
Kim, Hee-Seok ; Lee, Jong-She ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 303~309
For the propagation of elastic waves in unbounded domains, absorbing boundary conditions at the fictitious numerical boundaries have been proposed. In this paper we focus on both first and second order paraxial boundary conditions(PBCs) in the framework of variational approximations which are based on paraxial approximations of the scalar and elastic wave equations. We propose a penalty function method for the treatment of PBCs and apply these into finite element analysis. The numerical verification of the efficiency is carried out through comparing PBCs with Lysmer-Kuhlemeyer's boundary conditions.
The Stress Analysis of Structural Element Using Meshfree Method(RPIM)
Han, Sang-Eul ; Yang, Jae-Guen ; Joo, Jung-Sik ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 311~319
A Meshfree is a method used to establish algebraic equations of system for the whole problem domain without the use of a predefined mesh for the domain discretization. A point interpolation method is based on combining radial and polynomial basis functions. Involvement of radial basis functions overcomes possible singularity Furthermore, the interpolation function passes through all scattered points in an influence domain and thus shape functions are of delta function property. This makes the implementation of essential boundary conditions much easier than the meshfree methods based on the moving least-squares approximation. This study aims to investigate a stress analysis of structural element between a meshfree method and the finite element method. Examples on cantilever type plate, hollow cylinder and stress concentration problems show that the accuracy and convergence rate of the meshfree methods are high.
A Gridless Finite Difference Method for Elastic Crack Analysis
Yoon, Young-Cheol ; Kim, Dong-Jo ; Lee, Sang-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 321~327
This study presents a new gridless finite difference method for solving elastic crack problems. The method constructs the Taylor expansion based on the MLS(Moving Least Squares) method and effectively calculates the approximation and its derivatives without differentiation process. Since no connectivity between nodes is required, the modeling of discontinuity embedded in the domain is very convenient and discontinuity effect due to crack is naturally implemented in the construction of difference equations. Direct discretization of the governing partial differential equations makes solution process faster than other numerical schemes using numerical integration. Numerical results for mode I and II crack problems demonstrates that the proposed method accurately and efficiently evaluates the stress intensity factors.
Development of Quasi-Conforming Shell Element for the Three Dimensional Construction Stage Analysis of PSC Bridge
Kim, Ki-Du ; Byun, Yun-Joo ; Kim, Hyun-Ky ; Lomboy, Gilson R. ; Suthasupradit, Songsak ; Kim, Young-Hoe ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 329~338
The PSC box bridge constructed of concrete, reinforcing bar and tendon is a complex structure that exhibits tension cracks, nonlinear behaviour of steel and time dependent behaviour of concrete. The frame element is commonly used for construction stage analysis PSC bridges. However, the frame element does not show sufficient information when in the curved PSC box bridges. For the case of curved PSC bridges, the deformations in the inner and outer web are different. In this case, different jacking forces are required in the inner and outer webs. However, it is impossible to calculate different jacking forces if we use the frame element for construction stage analysis. In order to overcome this problem, the use of the shell element is essential for a three-dimensional construction stage analysis of PSC bridges. In the following, the formulation of a Quasi-conforming shell element and its application of PSC box girder bridge analysis are presented.
Shape Design Sensitivity Analysis Using Isogeometric Approach
Ha, Seung-Hyun ; Cho, Seon-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 339~345
In this paper, a variational formulation for plane elasticity problems is derived based on an isogeometric approach. The isogeometric analysis is an emerging methodology such that the basis functions for response analysis are generated directly from NURBS (Non-Uniform Rational B-Splines) geometry. Furthermore, the solution space for the response analysis can be represented in terms of the same functions to represent the geometry, which enables to provide a precise construction method of finite element model to exactly represent geometry using B-spline base functions in CAD geometric modeling and analyze arbitrarily shaped structures without re-meshing. In this paper, a continuum-based adjoint sensitivity analysis method using the isogeometric approach is extensively derived for the plane elasticity problems. The conventional shape optimization using the finite element method has some difficulties in the parameterization of geometry In the isogeometric analysis, however, the geometric properties are already embedded in the B-spline basis functions and control points so that it has potential capability to overcome the aforementioned difficulties. Through some numerical examples, the developed isogeometric sensitivity analysis method is verified to show excellent agreement with finite difference sensitivity.
Study on the Efficient Dynamic System Condensation
Baek, Seung-Min ; Kim, Ki-Ook ; Cho, Maeng-Hyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 347~352
Eigenvalue reduction schemes approximate the lower eigenmodes that represent the global behavior of the structures. In the previous study, we proposed a two-level condensation scheme (TLCS) for the construction of a reduced system. In the first step, the selection of candidate elements by energy estimation, Rayleigh quotient, through Ritz vector calculation. In the second step, the primary degrees of freedom are selected by the sequential elimination method from the degrees of freedom connected to the candidate elements in the first step. In the present study, we propose TLCS combined with iterative improved reduced system (IIRS) to increase accuracy of the higher modes in the intermediate range. Also, it is possible to control the accuracy of the eigenvalues and eigenmodes of the reduced system. Finally, numerical examples demonstrate the performance of the proposed method.
A Study on the Nonlinear Analysis of Containment Building in Korea Standard Nuclear Power Plant
Lee, Hong-Pyo ; Choun, Young-Sun ; Lee, Sang-Jin ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 353~364
In this paper, a nonlinear finite element analysis program NUCAS, which has been developed for assessment of ultimate pressure capacity and failure mode for nuclear containment building is described. Degenerated shell element with assumed strain method and low-order solid element with enhanced assumed strain method is adapted to microscopic material and elasto-plastic material model, respectively. Finally, the performance of the developed program is tested and demonstrated with several examples. From the numerical tests, the present results show a good agreement with experimental data or other numerical results.
Development of Web-based High Throughput Computing Environment and Its Applications
Jeong, Min-Joong ; Kim, Byung-Sang ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 365~370
Many engineering problems often require the large amount of computing resources for iterative simulations of problems treating many parameters and input files. In order to overcome the situation, this paper proposes an e-Science based computational system. The system exploits the Grid computing technology to establish an integrated web service environment which supports distributed high throughput computational simulations and remote executions. The proposed system provides an easy-to-use parametric study service where a computational service includes real time monitoring. To verify usability of the proposed system, two kinds of applications were introduced. The first application is an Aerospace Integrated Research System (e-AIRS). The e-AIRS adapts the proposed computational system to solve CFD problems. The second one is design and optimization of protein 3-dimensional structures in structural biology.
Acceleration of the Perception Threshold of Occupants for the Horizontal Vibration of Tall Buildings
Cho, Kang-Pyo ; Shin, Sung-Woo ; Jeong, Seung-Hwan ; Cho, Soo-Youn ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 371~377
In this paper, acceleration threshold of perception for the horizontal vibration of tall buildings was estimated. Excessive vibration of tall buildings by wind can give displeasure, such as giddiness and visual insecurity. To provide comfortable environment to residents of tall buildings, acceleration needs to be limited. For tall buildings the first mode of vibration is dominant. To reproduce the first mode of vibration, experiments were performed by generating sine waves by a shaking table. A nitration house was made and forty persons were employed for experiments. The forty persons were organized into five experimental groups, each of which was composed of eight persons, and the threshold of perception for horizontal vibration was measured by increasing acceleration in the range of 0.2Hz through 1.2Hz of frequency, Performance curves were obtained by dividing the distribution of perception for horizontal vibration into the range of
and by fitting curves.
Estimation of Topographic Effects over 3-Dimensional Hills with Different Slopes through Wind Tunnel Tests
Cho, Kang-Pyo ; Cheong, Myung-Chae ; Cho, Gi-Sung ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 379~386
In this paper, topographic factors over 3-dimensional hills were estimated through wind tunnel tests. Topographic models having five different slopes of
which were based on Korean Building Code(KBC(2005), were made for wind tunnel tests. From the result of wind tunnel tests, topographic factors over 3-dimensional hills were obtained at various locations, and the ranges of topographic effects were decided. The ranges of topographic effects was whole area of the hills in the horizontal ranges and heights of 3.5 times of the hills in the vortical ranges. Topographic effects was large at the top of hills, and wind velocity was increased 57% over hill of
, 75% over hill of
, 79% over hill of
, 81% over hill of
, and 61% over hill of
. Wind velocity was bigger over surface of across-wind direction of hills than one over surface of wind direction of hills, and wind velocity was increased
at locations of across-wind direction.
A Study on Development of U-Manless Overload Regulation System
Jo, Byung-Wan ; Kim, Do-Keun ; Choi, Hae-Yun ; Park, Jung-Hun ; Yoon, Suk-Min ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 387~392
Overloaded Vehicles are one of biggest of hazard in durability decrease of roads and bridges. Thus, regulation was put in force about overloaded vehicles to reserve this problem. However, existing system had many problems. For these reasons, this paper presents solutions of U-intelligent overload vehicles regulation system based on manless and wireless for fixing of problems of existing system and construction of u-lTS. With this in mind, we studied about composition method of system, applications of USN, design of system controller, WCDMA/HSDPA and we verified performance of WIM Sensors in this paper.
A Concept of Multi-Layered Database for the Maintenance and Management of Bridges
Kim, Bong-Geun ; Yi, Jin-Hoon ; Lee, Sang-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 20, issue 3, 2007, Pages 393~404
A concept of multi-layered database is proposed for the integrated operation of bridge information in this study. The multi-layered database is a logically integrated database composed of standardized information layers. The standardized information layers represent the data sets that can be unified, and they are defined by standardized information models. Classification system of bridge component was used as a basis of the multi-layered database, and code system based on the classification system was employed as a key integrator to manipulate the distributed data located on the different information layers. In addition, data level indicating priorities of information layers was defined to support strategic planning of the multi-layered database construction. As a proof of concept, a prototype of multi-layered database for object-oriented 3-D shape information and structural calculation document was built. Data consistency check of the semantically same data in the two different information layer was demonstrated, It is expected that the proposed concept can assure the integrity and consistency of information in the bridge information management.