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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
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Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 17, Issue 3_6 - Nov 1997
Volume 17, Issue 2_6 - Nov 1997
Volume 17, Issue 1_6 - Nov 1997
Volume 17, Issue 3_5 - Sep 1997
Volume 17, Issue 2_5 - Sep 1997
Volume 17, Issue 1_5 - Sep 1997
Volume 17, Issue 3_4 - Jul 1997
Volume 17, Issue 2_4 - Jul 1997
Volume 17, Issue 1_4 - Jul 1997
Volume 17, Issue 3_3 - May 1997
Volume 17, Issue 2_3 - May 1997
Volume 17, Issue 1_3 - May 1997
Volume 17, Issue 3_2 - Mar 1997
Volume 17, Issue 2_2 - Mar 1997
Volume 17, Issue 1_2 - Mar 1997
Volume 17, Issue 3_1 - Jan 1997
Volume 17, Issue 2_1 - Jan 1997
Volume 17, Issue 1_1 - Jan 1997
Selecting the target year
Analysis of Measured Data for Monitoring of Bridge under Ambient Traffic
Lee, Sun-Goo ; Lee, Sung-Woo ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_3, 1997, Pages 325~325
To insure the safety of the bridge and continuously assess its condition, the maintenance system with instrumented monitoring in conjunction with visual inspection is thought to be effective. Through continuous monitoring of measured dynamic data under ambient traffic, it is considered to be possible to keep track the performance change and detect any defect of the bridge. In this paper, a practical method to analyze the data in real time is proposed, and an application to bridge monitoring is illustrated. By determining threshold for data acquisition of dynamic monitoring through the proposed scheme, data volume to be processed can be greatly reduced. The amplitude and frequency are obtained in real time through recursive discrete Fourier transform, and abrupt change can be defected using probability and decision function.
An Experimental Study of Underwater Concrete for Property Evaluation
Yun, Yeong-Su ; Lee, Seung-Hun ; Won, Jong-Pil ; Jang, Il-Yeong ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_3, 1997, Pages 335~335
This paper presents the properties and characteristics of underwater concrete. Three different experiments were carried out in a series. First, five domestic and foreign-made anti-washout admixtures commercially available in Korea were comparatively analysed to select the most appropriate one for the next step. Second, test for compressive strength, modulus of rupture and bond strength were performed for comparison and quantitative analysis on three different types of cement (Type I, Type V, low-heat cement). Third, heat of hydration and core strength were measured in consideration of cement types and placing conditions. Test specimens have been made both in ambient and underwater conditions to take into account the variation according to the environmental condition.
A Calculation of One Dimensional Blasting Pressure of TNT Using the Finite Difference Method
Kim, Moon-Kyum ; Chun, Chong-Keun ; Oh, Keum-Ho ; Kim, Woo-Jin ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_3, 1997, Pages 347~347
Estimation of blasting behavior of explosives is prerequisite in the numerical analysis of blasting works. In this study, physical and simplified chemical models are considered to formulate the one-dimensional behavior of blasting gas. Conservation of mass, momentum, and energy, and equation of state of ideal gas are used in the physical modelling. The first order reaction rate and the initiation of thermal explosion are applied in the chemical modelling. The complex reaction processes of the blasting gas are simplified as a single step. Lax-Wendroff Flux-Corrected Transport Algorithm is used for solving the governing equations. To verify the developed code, the Sod's shock tube and the strong shock interaction problem are considered. Numerical results show that the shock wave can be captured by means of the FCT algorithm in the nonreacting states. In order to estimate the behavior of the chemical reacting state, initiation process and propagation behavior of the blasting wave of the explosive TNT are investigated. The results (Chapman-Jouguet values) of blasting velocity and pressure in steady state blasting flow are compared with the experimental and theoritical results provided by R.D. Cowan.
Numerical Investigation of Fracture Characteristics and Size Effect for High Strength Concrete Beam
Eo, Seok-Hong ; Kim, Jin-Keun ; Kim, Hee-Sung ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_3, 1997, Pages 361~361
Size effect laws (SEL) based on linear elastic fracture mechanics (LEFM) concepts, and fracture process zone (FPZ) modifications of that concept, predict that the flexural strength of plain concrete specimens decreases continuously as the specimen's depth increases. By contrast it is observed experimentally that while the flexural strength of unnotched specimens at first decreases as the specimen's depth increases, that strength subsequently reaches a limiting value for very large specimens. A finite element analysis, using a bilinear fictitious crack model (FCM), was made to investigate fracture characteristics and size effect predictions for normal strength concrete (NSC) and high strength concrete (HSC) with and without an initial crack (notch). Based on the numerical results a simple size effect equation was proposed and compared with the predictions of equations proposed by others. It is concluded that fracture energy and softening behavior need to be included to investigate fracture characteristics and to develop size effect laws for high strength concretes. Futhermore, physical tests and researches are needed to determine that size effect relationship for HSC.
Fatigue Behavior of Coped Stringers in the Floor System of Railway Bridges
Jeon, Jun-Chang ; Choi, Won-Kyung ; Byun, Yun-Joo ; Chang, Dong-Il ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_3, 1997, Pages 373~373
Fatigue test was conducted on 7 full-scale specimens to investigate the fatigue behavior of coped stringers in the floor system of railway bridges. Stress range and cope geometry were the two test parameters. Results of the fatigue test show that the fatigue life of the specimens decreases with decreasing cope radius. The finite element method is introduced to evaluate the stress concentration effect caused by the cope geometry and linear elastic fracture mechanics is used to predict the fatigue life of the test specimens. Based on analytical study and the limited number of experimental data, it is found that the stress concentration effect caused by the cope geometry is very localized in the vicinity of coping area and that the rectangular cope has the faster crack initiation than the round cope. Also, it is recommended that category C in Korea highway specification could be used for designing the round coped stringers subjected to fatigue loading and that coping must be made round to improve the fatigue strength.
Damage Assessment of Structures Based on Static and Modal Test Data
Oh, Byung-Hwan ; Jung, Beom-Seok ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_3, 1997, Pages 383~383
The purpose of present study is to propose an improved damage detection and assessment algorithm that has its basis on the method of system identification. In this approach, the complete sets of modes or displacements are not needed since the error function involves only the differences between components of those vectors. The present approach allows the use of composite data which consist of static displacements and eigenmodes. In the dynamic test, the curvature and slope of mode shapes are introduced to formulate the error responses. Using these techniques, a parametric study is conducted and effectiveness of the method is discussed. Generally, the developed algorithm is also able to detect and assess damages in a structure when the measured data are sparse. To examine the capability of the proposed damage assessment algorithm, a series of tests for a predetermined damaged 2-span continuous beam and a planar bowstring truss structure are performed.
Faceted Information Classification System for the Construction Management Based on Computer Application
Kang, Leen-Seok ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_3, 1997, Pages 397~397
Project Management Systems(PMSs) have increased in popularity, but their potential falls well short of the objectives of information management. Information management is the life-blood in a construction project. It covers drawings, specifications, bills of quantities, schedules and cost analysis. A Work Breakdown Structure(WBS) of information management becomes a central information, and it has to be seen as a necessary function of a PMS. Since the SfB system was developed in 1946, the CI/SfB system and Masterformat system have been used as representative systems for the classification in construction industry. But the existing systems have difficulties in application to civil engineering. The present study suggests a new information classification system for civil works. It consists of 4 tables, such as a facility table, a space table, an element table and an operation table. A stage in a construction project could be expressed by the matrix form in a facet classification system. The new system suggested in this study will be a first classification system applicable to civil works which consist of facilities and operations. It is also expected to be used as a common information classification for PMSs and the Computer Integrated Construction(CIC) based on the CAD.
Analysis to Improve the Estimated Criterion for Construction Supervision Cost
Lee, Yang-Kyoo ; Kang, Leen-Seok ; Kim, Chang-Hak ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_3, 1997, Pages 409~409
Since 1994, the Korean Government has adopted a new construction supervision system, which has made significant contributions to the quality and constructor's recognition in the construction area. But with lack of experience and technology in the supervision system, various problems have been raised. To grasp the problems of the existing construction supervision system, this study surveyed about 50 construction sites, and carried out a questionnaire survey to collect supervisor's opinion more accurately. Based on those problems concerned with the criterion for supervision cost, the solutions to improve supervision system are provided. The present study suggests that a project classification needs to be classified for categories, the corrections for the length of construction site and the extension of construction duration should be also considered to estimate supervision cost.
Aging and Life Extension of PWR Steel Containment, Kori Unit 1
Kim, Jae-Seok ; Lee, Nam-Ho ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_3, 1997, Pages 421~421
Many studies have been performed for life extension of LWR's since many of these plants have reached their predesignated life span throughout the world. All available elements in KORI Unit 1 are gathered and reviewed for cost/benefit evaluation which are considered prudent in determining the feasibility of extended plant operation. Thereafter, the metal containment is second in importance only to the reactor pressure vessel. Complementary studies have been made to improve the knowledge and the control of aging processes. These study include the followings: (1) metal shell corrosion, (2) fatigue damage, and (3) recommendations to support assumptions. In the first phase, preliminary conclusions can be drawn from ongoing studies. Results from previous life extension studies indicate that the containment is not a limiting component in continued plant operation.
Analysis of Vibrations of a Structure Neighboring a Railway Bridge Induced by High-speed Train Running
Yang, Sin-Chu ; Lee, Seong-Won ;
Journal of The Korean Society of Civil Engineers, volume 17, issue 1_3, 1997, Pages 433~433
An analytical procedure is presented for evaluating the vibrations in structures neighboring railway bridges due to high-speed train running. The solution precedure is devided into two steps because it is too complicated to simulate the interaction of the train-bridge-soil medium-structure system at the same time. At the first step, a simulation method is developed to solve the interaction problem between TGV high-speed trains and PC-Box bridges. The equations of motion are derived by using Lagange's equation of motion and the conventional finite element method for train and bridge respectively. Then the differential equations are solved by applying Newmark-
direct integration algorithm. At the second step, the dynamic interaction analyses for the pier-soil medium-structure system are carried out by a hibrid IEM/FEM methodology. The input force in the analysis is given as the dynamic loading subjected to a pier, which was obtained through the first step analysis. To investigate the vibration effects on the human, structure, and vibration-sensitive equipment, the vibration levels in the structure are compared with the standards related to each of them.