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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea institute for structural maintenance and inspection
Journal Basic Information
Journal DOI :
Korea Institute for Structural Maintenance Inspection
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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
An Experimental Study on the Flexural Behavior of Prestressed Composite Double T-Beams
Hong, Sung-Nam ; Kim, Kwang-Soo ; Han, Kyung-Bong ; Park, Sun-Kyu ; Yoo, Byoung-Eok ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 49~56
The existing Double T-Beams have been positively constructed in America and Europe due to their elegant appearance and simple section shapes. However, there are some problems; thery are relatively weak in the structural resistance, and need to use somewhat limited and complicated construction methods. In this paper, new composite beams made of concrete and steel are proposed, by taking adventage of their merits in an effort to solve thess controversial problems. In addition, feasibility is presented in developing composite Double T-Beams by introducing pre-stressing forces as well to enhance structural safety.
Determination of Thermal Cracking Index of Internal Restricted Mass Concrete Using a Numerical Analysis
Seo, Ki-Young ; Kim, Hee-Sung ; Jin, Chi-Sub ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 57~67
The service life of concrete structure is to a great extent influenced by crack developed at early ages of concrete material. Especially, hydration heat is a main cause of thermal cracking at mass concrete structures. The thermal cracking of massive structure is analyzed of the thermal cracking index which was presented Concrete Standard Specifications. The thesis analyzed the thermal cracking index which considered various variable (cement type, height of casting, curing condition, concrete mixing temperature, the unit cement content) at internal restricted mass concrete. The analysis result is denoted increase and decrease rate of thermal cracking index whenever the variables change. The results is helped to understand thermal cracking every time structures is designed and constructed. And I think that it is useful economic and stable design of mass concrete structures.
Experimental Study on the Presentation of Adequate Type and Number of Bracing Panel for Design of U-Shaped Steel Box Girder
Shim, Nak-Hoon ; Park, Young-Suk ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 68~76
In the present study, tests for U-type steel box girder are performed to observe the effects of W-type and X-type of top lateral bracings on the bending behavior of the U-type steel box girder system. Another objective of the present study is to investigate the adequacy of the currently available design formula. For the structural tests, the test specimen with two third scale of the system constructed in the field was used. In this test, several different spacings are used for the top lateral bracings. The stresses measured from the bending tests are compared with those by the formula proposed by Helwig. An adequate type and the required number of panel for diagonal bracing was obtained.
Failure Strength Analysis of Simply Supported Sandwich Slab Bridges made by Composite Materials
Han, Bong-Koo ; Kim, Se-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 77~84
In this paper presented, a design method of sandwich slab bridge of simple supported made by composite materials. Many of the bridge systems, including the girders and cross-beams, and concrete decks behave as the special orthotropic plates. Such systems with sections, boundary conditions other than Navier or Levy solution types, or with irregular cross sections, analytical solution is very difficult to obtain. Thus, Finite Difference Method is used for analysis of the pertinent problem. For the design of bridge made by the composite materials, cross-section is used the form-core shape because of this shape is economical and profitable, and for output of the stress value used F.D.M. Based the experimental of a composite specialist, an equation expressing the rate of decrease of tensile strength of glass fibers based on increase of mass was obtained. From these equations, one can estimate the rate of tensile strength reduction due to increased size. Tasi-Wu failure criterion for stress space is used. Strength-failure analysis procedure, using these reduced tensile strength, is presented.
Effects of Admixtures in Properties of Polymer Cement Mortar for Concrete Repair
Song, Hyung-Soo ; Lee, Chin-Yong ; Min, Chang-Shik ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 85~94
The EVA polymer is used as a modifier in the repair mortar, which contains various admixtures and mineral admixtures. It has been reported that the effect of polymer in cement mortar by the cement-polymer ratio only, but effect of admixtures over the polymer mortar was unknown. In this study, the fresh and mechanical properties of polymer cement mortar influenced by the range of admixtures(CSA expansive addictive, CSA accelerator, gypsum, silica fume) ratio were investigated.
The Non-destructive Inspection Using Infrared Thermal Technique on Reinforced Slopes by Shotcrete
Shin, Chang-Gun ; Lee, Song ; Ahn, Sang-Ro ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 95~102
It needs to Prevent damage as aging shotcrete itself exists as a dangerous component to comuting vehicles or infrastructure due to scaling, spaling, and loosening. However, it is hard to make an approach owing to a steep slope and high work, and there has been indicated a limit that it is difficult to grasp the internal condition of shotcrete on the surface. This study aimed to research internal defects that cannot be observed from the surface, by measuring a subtle thermal transfer on the shotcrete surface by using infrared thermography for overcoming such a technical limit. As a result of conducting an inspection through an analysis on measured data and fieldwork using an endoscope camera, it was impossible to accurately determine the wet part because of an excessive coating of shotcrete, yet, This study is proposed effictively extract a void part of the inside with non-destructive and non-touching method.
Active Control for Seismic Response Reduction Using Probabilistic Neural Network
Kim, Doo-Kie ; Lee, Jong-Jae ; Chang, Seong-Kyu ; Choi, In-Jung ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 103~112
Recently structures become longer and higher because of the developments of new materials and construction techniques. However, such modern structures are susceptible to excessive structural vibrations, which may induce problems of serviceability and structural damages. In this paper we attempt to control structural vibration using the probabilistic neural network(PNN) and the artificial neural network(ANN) based on the training pattern that consist of only the structural state vector and the control force. The state vectors of the structure and control forces made by linear quadratic regulator(LQR) algorithm are used for training pattern of PNN and ANN. The proposed algorithm is applied for the vibration control of the three story shear building under Northridge earthquake. Control results by the proposed PNN and ANN are compared with each other.
Self-Diagnosis Property of Fracture in Carbon Fiber Composite Mortar
Park, Seok-Kyun ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 113~120
A new material was tested and its applicability was investigated so as to give the capability of self-diagnosis of fracture in composite mortar. In the research for giving self-diagnosis capability, conductive mortar intermixed with cokes and carbon fiber powder(milled carbon fiber) was developed and its using for self-diagnosis material was proposed. Then after examining change in the value of electric resistance and AE characteristics before and after the occurrence of cracks at each weight-stage, the relationships of each factors were analyzed. As the results, it can be recognized that a new composite material with cokes and carbon fiber powder(milled carbon fiber) can be applied for self-diagnosis of fracture in mortar specimen.
Influence of Column Aspect Ratio on the Punching Shear Strength of Flat Plate Slab-Column Edge Connections
Shin, Sung-Woo ; Choi, Myung-Shin ; Kim, Cheol ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 121~129
The aim of this study is to investigate punching shear strength of exterior connections in the flat plate structure with rectangular column. To inspect the effect of column aspect ratios on the punching shear behavior, eight specimens for exterior connection were made and tested. In this experimental program the length of critical perimeter was kept constant, while column aspect ratio varied from 2.0 to 4.5. Two levels of concrete strength and slab reinforcement ratio were also considered. As the column aspect ratio increased, the punching shear strengths are decreased. The decrement of punching shear strength was small in specimens with high aspect ratio of column.
Experimental Investigation of the Shear Behavior of RC Beams Strengthened with Glass Fiber-Steel Composite Plate(GSP)
Jang, Jun-Hwan ; Kim, Seong-Do ; Cho, Baik-Soon ; Cheung, Jin-Hwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 130~140
Fiber-sheet and steel-plate strengthening methods have been mainly used for strengthening the RC structures. However, recently the application of these two methods have dramatically decreased due to premature debonding failure between concrete surface and fiber-sheet and heavy self-weight of steel-plate. This article presents experimental results of shear behavior in RC beams strengthened with GSP(Glass fiber-Steel composite Plate). The thin steel plate in GSP makes usage of the anchoring system possible, which could delay or prevent the premature debonding failure. Three reference beams and 60 strengthened beams with GSP were tested. The experimental results showed that strengthened beams with GSP considerably increased in shear capacity compared with the reference beams.
The Sensitivity Analysis and Safety Evaluations of Cable Stayed Bridges Based on Probabilistic Finite Element Method
Han, Sung-Ho ; Cho, Tae-Jun ; Bang, Myung-Seok ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 141~152
Considering uncertainties of random input data, it is more reasonable to use probabilistic method than the conventional deterministic method for the design of structures or for the assessment of the responses of structures, which are designed as safe even under extreme loads. Therefore, to assess the quantitative effects of the constructed cable stayed bridge by the input random variables, a sensitivity analysis is studied. Using perturbation method, an analysis program is developed for the iterative probabilistic finite element analyses and sensitivity analyses of the cable stayed bridge, except the initial shape analysis. Monte-Carlo Simulations were used for the verification of the developed program. The results of sensitivity analysis shows the governing effects of external loads. Because the results also provide the sensitive effects of the stiffness of members and the magnitudes of prestressing force of cables, the developed
An Analysis on the seismic Performance of Additional Shear-Wall Construction for the Remodeling of Shear-Wall Type Apartment Buildings
Hong, Geon-Ho ; Jung, Woo-Kyung ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 153~162
The purpose of this study is to suggest structural design guidelines in additional shear-wall construction method for apartment remodeling with understanding the effects of the position, length and thickness of the additional walls. The slab-wall frames under seismic loads are analyzed using effective beam width model, which can practically evaluate the structural performance of existing building system. According to the results, proper design guidelines of additional shear-wall construction method(position, length and thickness) is suggested to get the required seismic performance.
Evaluation on the Characteristics of Weak Soil Adjacent to Chemical Compaction Pile of Using Bottom Ash
Kim, Sang-Chel ; Park, Kyung-Tae ; Sung, Ik-Hyun ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 163~170
To evaluate on the applicability of Chemical Compaction Pile (CCP) method to weak soil improvement, two kinds of testing chambers were fabricated and the changes of water content and shear stress associated with soil types, ages and distances from the center of pile were measured with different mixing proportions of CCP such as bottom ash, lime powder and added admixture. As results of test, it was noted that water content and shear stress of ground are mainly affected by the amount of lime powder and increase of the amount corresponds to rapid improvement of soil. And the improvement depended greatly on the types of soil also. It was finally found that CCP developed can be applicable to bearing pile as well as soil improvement since CCP has a bearing capacity enough to carry loads.
Comparison of Reliability of PSSC Girder Bridge for Different Limit States
Hwang, Chul-Sung ; Paik, In-Yeol ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 171~180
Reliability analysis of prestressed steel and concrete(PSSC) girders is conducted for deflection, stress and moment strength limit state. PSSC girder has strong advantages in terms of construction cost and vertical clearance for the span length of over 40 meters. In this paper, example PSSC girders with different span lengths, section dimensions and design stress levels are designed and analyzed to calculate the midspan deflection, stress and the section moment strength. Deflection limit state, stress limit state and strength limit state functions are assumed and the reliability indexes are obtained by Monte-Carlo simulation and Rackwitz-Fiessler procedure. The results show that the reliability of PSSC girder for deflection limit state is appropriately higher than the stress limit state and the reliability for moment strength is significantly conservative.
Analysis of the Flexural Strength of Reinforced Concrete Beams Strengthened with Prestressed Carbon Fiber-Reinforced Polymer Plates
Woo, Sang-Kyun ; Hong, Ki-Nam ; Han, Sang-Hoon ; Song, Young-Chul ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 1, 2007, Pages 181~192
The purpose of this study is to analyse and compare experimentally flexural behavior of RC beams strengthened with CFRP plates by different methods, and finally suggest the evaluation equations of flexural capacity of RC beams with the aim of application of prestressed CFRP strengthening. The experimental parameters are compressive strength, reinforcement ratio, prestressing level and strengthening methods. The non-prestressed specimens failed on account of separation of the plates from the beams due to premature de-bonding, while most of the prestressed specimens failed due to CFRP plate fracture. The evaluation equations of flexural capacity of RC beams is suggested and these equations have a good reliability in predicting flexural strength of RC beams.