Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korea institute for structural maintenance and inspection
Journal Basic Information
Journal DOI :
Korea Institute for Structural Maintenance Inspection
Editor in Chief :
Volume & Issues
Volume 11, Issue 6 - Nov 2007
Volume 11, Issue 5 - Sep 2007
Volume 11, Issue 4 - Jul 2007
Volume 11, Issue 3 - May 2007
Volume 11, Issue 2 - Mar 2007
Volume 11, Issue 1 - Jan 2007
Selecting the target year
Structural Performance of Reinforced Concrete Shear Walls Partially Cutted for Opening
Choi, Youn Cheul ; Choi, Hyun Ki ; Choi, Chang Sik ; Lee, Li Hyung ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 3, 2007, Pages 77~86
The more demands on efficient utilization of resources, the more structural engineers prefer to select remodeling to improve old building's capacity. A series of four shear wall specimens were tested under constant axial stress and reversed cyclic lateral loading in order to evaluate the effect of the opening on the lower center of the wall induce by remodeling. Consequently, the existence of opening was verified to induce a different failure, which was caused by reduction of compression strut area formed on the wall to diagonal direction. Especially, the ultimate strength of the wall with an opening was revealed approximately 35% lower than that of the wall without an opening. And the similar results were appeared in characteristics of stiffness and energy dissipation capacity.
Dynamic Analysis of Structures under Moving Loads in Time and Frequency Domain
Kong, Min Sik ; Yhim, Sung Soon ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 3, 2007, Pages 87~94
A structural dynamic analysis can be divided into a time domain analysis and a frequency domain analysis. The time domain analysis makes use of a direct integration method or a mode superposition method and the frequency domain analysis applies a DFT method. Generally the DFT method is more effective method in case of calculating response of periodic excitation. But in case of transient excitation exact solution can not be acquired. So, by modifying the response or increasing the period accuracy of solution can be enhanced. Accordingly this study analyzed dynamic responses of structures under aperiodic moving load in time domain and frequence domain. Consequently it is concluded that exact solution would be get enough using DFT method by increasing the duration of free vibration or modifying the dynamic response.
Influence of Concrete Strength and Lateral Ties on Behavior of High-Strength Concrete Columns Subjected to Eccentric Compressive Load
Lee, Young Ho ; Chung, Heon Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 3, 2007, Pages 95~104
This study was focused on the effect of concrete strength and lateral ties of concrete columns subjected to eccentric compressive loads. The twenty-four concrete columns with
square cross-section were tested. The main variables were concrete strength, spacing and configuration of lateral ties, and eccentricity ratios. From the experiment, the followings were investigated ; 1) In all cases, it was observed that the increase of concrete compressive strength led to the decrease of ductility. Also, as the eccentricity ratios increased, the effect of ductility enhancement by lateral ties decreased. 2) As the ties spacing decreased from 100mm to 30mm, the magnitude of axial load acting on the concrete column showed an enhancement of 1.1~1.2 times and the descending curve after a peak moment presented a smooth decline. 3) The high-strength concrete columns required a design of lateral ties to increase the volumetric ratios and density of tie spacing to sustain a proper strength and ductility. Accordingly, regardless of concrete strength, the current AIK design code to specify the maximum tie spacing of concrete columns was proven to lead to the poor strength and ductility for seismic design. Therefore, it is necessary to develop a new seismic design code that connects volumetric ratios and tie spacing of concrete columns with concrete strength.
The Bond Performance of RC Beams Strengrhened for FRP Pannel deal with Fatigue Loadings through Experiments
Lee, Chang Gyu ; Chung, Yung Bea ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 3, 2007, Pages 105~115
Repair and Reinforcement are subjected change to increasing of remodelling. The usage of carbon fiber sheets is increasing for the strengthening of reinforce concrete structures. Therefore experimental and analytical studies are carry out to investigate the flexural behaviors of the strengthened RC structures by the external bonding of the new reinforcement method. Also the aim of this study is to investigate reinforcing method of FRP panel deal with fatigue loading through experiments.
A Study on Survey of Carbonation for Sound, Cracked, and Joint Concrete in RC Column in Metropolitan City
Kwon, Seung Jun ; Park, Sang Sun ; Nam, Sang Hyuk ; Cho, Ho Jin ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 3, 2007, Pages 116~122
The concrete structures in Metropolitan city are usually exposed to carbonation and corrosion of embedded steel occurs due to the carbonation. In inspection and diagnosis of concrete structures, carbonation depth in sound concrete is mainly evaluated and service life for concrete structure is predicted based on the result. Generally, however, mass concrete structures such as columns have construction joint for suitable placing and also have cracks in early-age. In this study, carbonation depth in RC columns used for 20 years in metropolitan city is evaluated and also analyzed by considering the local conditions like sound, cracked, and joint area. The carbonation depth in cracked and joint area is more rapid than that in sound area, and it is thought to be more desirable to consider this effect in concrete structures with small cover depth. Furthermore, the technique for carbonation prediction in cracked concrete is derived in terms of crack width and the results from this technique are verified by comparing those from previous research.
Buckling Sensitivity of Laminated Composite Pipes Under External Uniform Pressure Considering Ply Angle
Han, Taek Hee ; Na, Tae Soo ; Han, Sang Yun ; Kang, Young Jong ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 3, 2007, Pages 123~131
The buckling behavior of a fiber reinforced plastic pipe was researched. When a cylindrical structure is made of isotropic material, it shows two dimensional buckled shape which has same deformed section along the longitudinal direction. But an anisotropic cylindrical structure shows three dimensional buckled shape which has different deformed section along the longitudinal direction. Because the modulus of elasticity is varied in a certain direction when ply angles are changed, the strength of a pipe are changed as ply angles are changed. In this study, the limitation of two dimensional and three dimensional buckling mode was investigated and the buckling strength of a laminated composite pipe was evaluated.
Structural Performance of Reinforced Concrete Shear Columns Strengthened with Sprayed Fiber Reinforced Polymers
Lee, Kang Seok ; Byeon, In Hee ; Lee, Moon Sung ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 3, 2007, Pages 132~142
In this study, a structural performance of R/C columns controlled by shear, strengthened with Sprayed FRP, was investigated. For this purpose, six 2/3-scaled column specimens were designed and tested by the pseudo-static reversed cyclic load under a constant axial load, which is 10% of the nominal axial strength of the column. Four specimens were strengthened by Sprayed FRP with different combinations of short fibers (carbon or glass) and resins (epoxy or vinyl ester). For comparison purpose, tests of a specimen strengthened with carbon fiber sheet (CFS) and a control specimen without strengthening were carried out, respectively. The result reveals that shear strengths and ductility capacities of columns strengthened with Sprayed FRP improved remarkably, compared to those of the control column, and the Sprayed FRP technique developed in this study is able to use the strengthening scheme of existing R/C columns.
Damage Evaluation of a Framed Structure Using Wavelet Packet Transform
Kim, Han Sang ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 3, 2007, Pages 159~166
This paper evaluates the soundness of structural elements using Wavelet Packet Transform (WPT). WPT is applied to the response acceleration of a framed structure which is subjected to earthquake load to decompose the response acceleration, then the energy of each component is calculated. The first five largest components in energy magnitude among the decomposed components are selected as input to an ANN to identify the damage location and severity. Two nodes in output layer yield damaged element and damage severity respectively. This method successfully evaluates the amount of damage and its location in the structure.
Performance Evaluation of NDE Methods in Condition Assessment of Structural Elements
Shim, Hyung Seop ; Kang, Bo Soon ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 3, 2007, Pages 167~175
The relations between data from test methods and conditions in structural elements are considered. NDE(Nondestructive Evaluation) methods are joint application of a test and a basis for interpretation of data obtained in the test. Correct assessments of conditions of elements depend on the inaccuracy and variability in the test data and on the uncertainty of correlations between attributes(what is measured) and conditions(what is sought in the inspection). A full description of the performance of NDE methods considers the relation of test data to condition of elements. The quality of the test data itself is important, but equally important is the interpretation that occurs after the test. To make the decision of the performance of NDE methods, this paper presents mathematical basis to measure the reliability of NDE methods.
Nonlinear Analysis of Composite Basement Wall Using Contact Element
Seo, Soo Yeon ; Lee, Chenggao ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 3, 2007, Pages 176~184
The objective of this paper is to suggest a nonlinear analysis process to predict the structural behavior and strength of composite basement wall member combined with H-Pile. Therefore, the structural behavior of composite basement wall is studied and the special nonlinear characteristics of each elements such as H-Pile, concrete wall, and shear connectors are idealized using ATENA program. Finally, the result is compared with previous test result. Research result shows that there is a good co-relation between analysis and test results even if analysis result has little bit higher initial stiffness than test result. It can be concluded that the nonlinear behavior of composite basement wall is suitably predicted by using the contact element model in ATENA program as shear connector element.
Seismic Performance Enhancement of Residential Flat Plate Structure by Using Base Isolation Devices.
Lee, Hyun Ho ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 3, 2007, Pages 185~191
For the seismic performance enhancement of residential flat plate structure and for the selection of earthquake records, the possibility of base isolation is evaluated and the time history results are reviewed. By evaluating a base isolated stiffness, a target period, and an envelope curve analysis, seismic performance of structure, which has strong rotational mode, is evaluated. For the propriety evaluation of earthquake records usage and scaling method, time history analysis is done with variables such as DBE(design base earthquake) level, MCE(maximum considerable earthquake) level, and 1.4DBE level. From the analysis results, following conclusions can be made; the earthquake records, which are used in base isolation analysis, should be selected by similar soil type which the structure is considered, and should be intensity scaled in a range of mean
standard deviation of code based design response spectrum.