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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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Korean Society of Civil Engeneers
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Volume & Issues
Volume 16, Issue 3_6 - Nov 1996
Volume 16, Issue 2_6 - Nov 1996
Volume 16, Issue 1_6 - Nov 1996
Volume 16, Issue 3_5 - Sep 1996
Volume 16, Issue 2_5 - Sep 1996
Volume 16, Issue 1_5 - Sep 1996
Volume 16, Issue 3_4 - Jul 1996
Volume 16, Issue 2_4 - Jul 1996
Volume 16, Issue 1_4 - Jul 1996
Volume 16, Issue 3_3 - May 1996
Volume 16, Issue 2_3 - May 1996
Volume 16, Issue 1_3 - May 1996
Volume 16, Issue 3_2 - Mar 1996
Volume 16, Issue 2_2 - Mar 1996
Volume 16, Issue 1_2 - Mar 1996
Volume 16, Issue 3_1 - Jan 1996
Volume 16, Issue 2_1 - Jan 1996
Volume 16, Issue 1_1 - Jan 1996
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Nonlinear Free Vibrations of Simply Supported Laminated Plates with Initial Curvature
Shin, Dong-Ku ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 1_2, 1996, Pages 105~105
Large-amplitude nonlinear vibration characteristics of simply supported, symmetrically laminated, rectangular thin plates with initial imperfection is investigated. The nonlinearity of strain components in the Von Karman sense is incorporated to the classical plate theory. Assuming the out-of-plane displacement as a double trigonometric function, the inplane displacement components are found by solving the nonlinear equations of motion expressed in terms of displacements. The nonlinear modal equation as a function of initial vibration amplitude is derived by applying Galerkin method to the governing equations of motion. Nonlinear fundamental frequencies of plates are calculated by solving the nonlinear modal equation applying 4-th order Runge-Kutta time integration scheme. The validity of the present approach is established by comparing the results with those available in the literature. Effects of plate aspect ratio, degree of orthotropy and initial curvature on the nonlinear vibration frequency of isotropic and angle-ply plates are analyzed.
On the Development of System Identification Technics for the Parameter Estimation of the Structure
Lee, Sang-Ho ; Ahn, Byoung-Ki ; Lee, Han-Ju ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 1_2, 1996, Pages 115~115
Parameters representing axial stiffnesses are found for a statically loaded truss by minimizing the squared error between the computed displacements and a set of numerically simulated measured displacements. The minimization is carried out with a modified Gauss-Newton algorithm with a cubic line search. Questions of minimum number of censors and loading conditions to find every member stiffness of truss are answered using eigenvalues and eigenvectors of an approximation to the Hessian matrix of the squared error function. Computer program developed is shown to be an accurate method for determining both the location and magnitude of damage to truss members.
Dynamic Analysis of Curved Bridge Subject to Vehicular Loads
Kim, Sung-Il ; Kwark, Jong-Won ; Chang, Sung-Pil ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 1_2, 1996, Pages 123~123
The purpose of this study is to investigate the dynamic behavior of curved bridge subject to moving vehicles. Thin-walled curved beam elements are used for modeling curved bridge. Cross sections of this element are assumed doubly symmetric. Shape functions of this element are homogeneous solutions of governing differential equations from Vlasov's theory. The free vibration analysis is performed by subspace iteration method. The 5 axle semi tractor-trailer is modeled. Road surface roughness of bridge decks are generated from PSD function. The effects of centrifugal force due to its motion in a circular riding path are included by considering superelevation of curved bridge. To solve the equations of bridge-vehicle motion. the
method with predictor-corrector iteration scheme is used. To investigate the general behavior of curved member subject to moving vehicles, some parametric studies are performed. From the results of parametric studies, radius of curvature, superelevation of curved member and road surface conditions are the most important factors which increase the dynamic effect.
An Experimental Study on Behavior of Damaged R/C Beams After Strengthening under Fatigue Loads
Sim, Jong-Sung ; Bae, In-Hwan ; Park, Seong-Jae ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 1_2, 1996, Pages 135~135
The behavior of R/C beams strengthened with steel plate and carbon fiber sheet under fatigue loadings is investigated in the present study. Several series of strengthened R/C beams have been tested to study the effect of different strengthening materials and length. The present study indicates that fatigue strength of all strengthened specimens for 1 million number of cycle as fatigue life of concrete show about yield strength of control beam. Strengthened beams with epoxy-banded-steel plate are failed by fatigue fracture of steel plate, while strengthened specimens with epoxy-bonded carbon fiber sheet (CFS) show bond failure mode. This study also indicates that use of adequate epoxy resin adhesive is needed. More studies are necessary to propose the design guide of strengthening the damaged R/C structures.
Ultimate Analysis of RC Gabled Hyperbolic Paraboloid Shell
Min, Chang-Shik ; Lee, Jae-Seok ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 1_2, 1996, Pages 143~143
Muller-Scordelis RC Gabled Hyperbolic Paraboloid (HP) shell is analyzed using a nonlinear finite element computer program which was developed by Mahmoud and Gupta and migrated to a Cray Y-MP C90 at SERI. At the ultimate the shell failed by a sudden brittle failure in the edge beam near the support area. The shell develops not only rather prominent membrane shear forces but also the membrane forces and bending moments, which shows that the shell resists the applied load in a quite complicate fashion. According to ACI 318-89 the Muller-Scordelis shell can sustain 3.1 times of design live load at the ultimate, which means that this shell is at least safe. It is possible for a designer to perform this type of analysis using the computer program we used on a routine basis to assure structural strength and the safety of the structures to accomplish economy.
Stochastic Dynamic Analysis of Suspension Bridge Subjected to Wind Loads: Torsional Vibration
Kim, Tae-Nam ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 1_2, 1996, Pages 153~153
A method of stochastic dynamic analysis of suspension bridge subjected to random wind loads has been developed in this paper. Example analyses are carried out by mode superposition method(MSM), mode acceleration method(MAM) and advanced mode acceleration method(AMAM) in frequency domain for the Nam-Hae Bridge. In this study the statistical characteristics of random wind loads are assumed to be Gaussian stationary zero mean processes. The considered structural response quanties are rotation displacements. The mean extreme responses are approximately calculated by three times of standard deviations. The followings are the conclusions from this study. 1. Numerical results which obtained by three methods of computer program developed in this paper agree reasonably well when the numbers of modes increase. 2. AMAM is simple, accurate, economic and reliable method compared with the MSM and the MAM.
The Fracture Behaviour of Damaged High-Strength Concrete Subjected to Dynamic Loading
Kang, Sung-Hoo ; Park, Sun-Joon ; Park, Yeon-Soo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 1_2, 1996, Pages 167~167
The Fracture behavior of high strength concrete is different from that of normal concrete in many aspects. These differences have yielded some harmful characteristics such as brittleness. The new high strength concrete can then be engineered to possess higher toughness and lower brittleness. This study aimed at investigating the mechanical behavior and characteristics of the high strength concrete and predicting the fracture behavior. The fracture parameters were used for the study. The fracture parameters were obtained from the three-point bending test on the 70 cm beam in length recommended by RILEM TC89-FMT Committee. This investigation involves the static loading test and the dynamic loading test with the constant amplitude. The specimens in the tests are single-edge-notched three-point bend beams that are the opening mode recommended by RILEM TC89-FMT Committee, and
On The Development of System Identification Technics for the Parameter Estimation of the Structure
Lee, Sang-Ho ; Ahn, Byoung-Ki ; Lee, Han-Joo ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 1_2, 1996, Pages 175~175
Parameters representing mass, damping, and member stiffness are found for the shear buildings under the free vibration mode by minimizing the squared error between the computed response and measured one. The minimization is carried out with a modified Gauss-Newton algorithm with a cubic line search. Questions of various conditions to find every unknown parameters of the shear buildings are answered by mathematical models with numerically simulated data and an experimental model with measured data. Computer program developed is shown to be an accurate method for determining both the location and magnitude of damage to the shear buildings.
Model Tests Study on Self-excited Vibration of Tainter Gate
Lee, Seong-Haeng ; Jung, Kyoung-Sup ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 1_2, 1996, Pages 187~187
A model test was performed for tainter gate to find out dynamic phenomena and behaviors. In the submerged tainter gate models in free-surface flow, vertical and horizontal vibrations were tested under the different gate openings and water level conditions. In order to investigate the vibration on the transverse beams of the tainter gate in single plate due to shear-layer vortices and waves, gate models with various panel type in downstream side were conducted. Also vibrational phenomena and dynamic behaviors due to lifting velocity and to position of rubber seal at gate bottom were experimented. Resultantly in this paper, the dynamic characteristics of tainter gate were discussed. Gate bottom geometries to reduce the amplitudes of vibration were presented through model tests.
A Study on a Plan for The Operation Improvement of Schedule Management System
Park, Hong-Tae ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 1_2, 1996, Pages 195~195
Seeing through general construction performance environment of our country as compared to an advanced nation, we may stand behind more the side of management than the side of technique. It does not mean that experience and knowledge of a construction engineer stand behind, but mean that management system which has an ability to judge objectively, exchange of information and education of excellent experience and accumulated knowledge systematically. Therefore, this study aimes to present a conceptual model to be a plan for the operation improvement of integrated schedule management system. it can exchange efficiently all sorts of information related to construction among a main office, a branch office and field (or, client, supervisor, contractor). This system clearly assigns a work of each construction organization related to schedule management, classfication of information into detail levels. This system also performs detail information related to real schedule management from the field, and makes branch office to analyze the problem and suggest reasonable solution. it can provide summary information to main office, which can be used to control many fields in the end.
Evaluation of the Ultimate Pressure Capacity of the CANDU-6 Containment using Material-Nonlinear Model
Chung, Chul-Hun ; Jang, Sung-Wook ; Cho, Kyung-Tae ; Park, Chil-Lim ;
Journal of The Korean Society of Civil Engineers, volume 16, issue 1_2, 1996, Pages 205~205
The behavior of reactor containment under high pressure due to the loss of coolant accident is an important consideration of structural safety in the design of nuclear power plant. This safety assessment can be carried out by confirming the ultimate capacity of structure by means of nonlinear analysis. In this study, the stress analysis for CANDU-type containment is conducted to examine the ultimate capacity under internal accident pressure by using computer program ADINA. Axisymmetric element is chosen to model the containment. Especially, the effect of hinge behavior between wall and base slab as well as the effect of sliding membrane between base slab and sub-base slab are considered in modelling. In order to predict the response of structure under high internal pressure, the nonlinear material models which are capable of representing yielding, crushing and cracking are utilized. The failure modes and associated failure would be occured at upper dome and successively wall, which is consistent with the analysis result of Gentilly-2 containment performed by the University of Alberta in Canada.