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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
An Experimental Study on the Properties of Concrete Using the Waste Gypsum
Kim, Nam Wook ; Song, In ; Park, Rae Seon ; Bae, Ju Seong ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 69~76
As amount of waste matter rapidly increases with fast growth of cities and industry, how to dispose them has arisen as an important problem. Current policy of the government on disposal of waste is repressing generation of waste itself and in case of already generated waste, resource cycle waste management system that recycles waste after proper environmental process is getting established. Therefore recycling of waste and industrial by-products is rising hugely. One of largely wasted matters is waste gypsum, which was categorized as designated waste but changed to general since 1994. Due to disposal cost and lack of impurities removal technology, recycling of it was quite low. However, as impurities removal technology using semi-dried desulfurization process is developed lately, study on recycling of waste gypsum is going on lively. This study examines possibility of utilizing waste gypsum as alternative for concrete cement and analyzed attributes of waste gypsum before and after ball mill process to find out proper alternation ratio, and conducted strength and property tests on concrete subject whose percentage of cement use is substituted with 0, 5.0, 7.5, 10.0 and 12.5% of waste gypsum.
Elastic Buckling Characteristics of Corrugated Pipe Made of Orthotropic Composite Material
Han, Taek Hee ; Kim, Tae Yeon ; Han, Keum Ho ; Kang, Young Jong ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 77~84
The elastic buckling strength of a corrugated pipe made of orthotropic material was evaluated. The height and length of a corrugated wave and the thickness of the pipe were considered as factors affecting the buckling strength of the pipe. And also, the ratio of the longitudinal stiffness and transverse stiffness were considered as parameters affecting on the buckling strength of a pipe made of orthotropic material. Buckling strengths of various corrugated pipes with different shapes and stiffness ratio were evaluated by FE analyses. And a formula to estimate the elastic buckling strength was suggested by regression of FE analysis results. Analysis results show that a corrugated pipe has superior buckling strength to a general flat pipe and the suggested formula estimates accurate buckling strength of the corrugated pipe made of orthotropic material.
Penetration of De-icing Salt in Bare Concrete Bridge Decks in Highways
Suh, Jin Won ; Ku, Bon Sung ; Rhee, Ji Young ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 85~92
In 1980s, a number of bridges with bare concrete deck were constructed on the Korea highway. After 20 years service, many bare concrete decks are still in good condition without special maintenance activity. Therefore, the application of the bare concrete deck is being reestimated from the view of construction and maintenance. As a part of the program, the characteristic of penetration(surface chloride and apparent diffusion coefficient) of de-icing salt into bare concrete bridge deck was analyzed in order to predict the service life of bridge on Korea highway.
Feasibility Verification for the Basic Shape of FRP Bridge Decks Using Optimization Algorithm
Park, Ki Tae ; Hwang, Yoon Koog ; Lee, Young Ho ; Jeong, Jin Woo ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 93~102
A large number of FRP decks are already in service worldwide because the lighter FRP-based bridge decks are ideal for rapid construction to reduce the dead load of superstructures. And the proper design process is demanded for the effective FRP deck application. In this paper, to get the basic prototype of FRP bridge decks, the ratio of individual parameters, which compose the specification of FRP bridge decks, are determined by a finite element analysis. In addition, optimum FRP deck shapes are determined considering complex constraints and material properties of bi-directional characteristics. Upon these results, the prototype of FRP bridge decks is validated.
Stress Measurement of Structural Member Using Piezoelectric Property
Im, Eun Sang ; Kim, Tea Hoon ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 103~108
A stress measurement method of structural member using piezoelectric property and electrostatic voltmeter is presented. The electric potentials of the surface of the piezoelectric element, which are proportional to the strain
on the structural member, are measured by an electrostatic voltmeter during load cycling. The stress
is calculated by this strain
. Moreover, a stress distribution measurement tape which can be used for the stress distribution measurement along a specified line on the surface of structural member is developed, and the surface potential was measured by an electric static voltmeter of non-contact type. The applicability of the stress distribution measurement tape is examined through experiments using a notched specimen under cyclic loading. The measured distributions of x, y and xy are compared with those calculated by FEM analysis.
Fire Resistance Performance of Load Bearing Hybrid Panel Infilled with Light-weight Formed Mortar
Park, Keum Sung ; Bae, Kyu Woong ; Kang, Hyun Sik ; Lim, Seo Hyung ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 109~116
The purpose of this paper is to evaluate the fire resistant performances of load-bearing wall using both composite and steel stud panel infilled with light-weight formed mortar under axial loading according to KS F 2257(1999). The minimum requirement of 2 hours fire resistant rating is needed for the residential and commercial buildings under the fire regulation of Korea. From test results, it is found that two types of specimen composed of the hybrid stud and steel stud panel filled with light-weight formed mortar fited in with the requirement of 2 hours fire resisting rate for the load-bearing wall. In the conclusions, the specimen with hybrid stud shows predominating fire-resistant performance on the adiabatic effects rather than that of the steel stud specimen.
Load Transfer Capacity for the Planar Joints between Existing Slab Retrofitted with Carbon Fiber Plate and New Slab
Kim, Seung Hun ; You, Young Chan ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 117~124
An experimental research has been performed to evaluate the load transfer capacity for the planar joints between existing and new slab in an apartment remodelling constructions expecially for enlarging the interior space. Post-installed dowel bars were used as a joint connector. The existing slabs were obtained from the existing apartment housing which will be demolished, and were retrofitted with carbon fiber plate. Test results showed that the planar joints with post-installed dowel bars behaved in full composite modes until ultimate capacity of test specimens, so sufficient ultimate and serviceability performance are confirmed.
Uniaxial Compression Behavior of Circular RC Columns Confined by Carbon Fiber Sheet Wraps
Han, Sang Hoon ; Hong, Ki Nam ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 125~133
External confinement by CFS (Carbon Fiber Sheet) is a very effective retrofit method for the reinforced concrete columns subject to either static or seismic loads. For the reliable and cost-effective design of CFS, an accurate stress-strain curve is required for CFS-confined concrete. In this paper, uniaxial compression test on short RC column with circular section was performed. To evaluate the effect of confinement on the stress-strain relationship of CFS-confined concrete, CFS area ratio, spiral area ratio, and concrete compressive strength are considered as the test variables. Experiment results indicate that CFS jacketing significantly enhances strength and ductility of concrete. In addition, the CFS-jacketed specimens with the spiral steel show the lower load increasement ratio than those without the spiral steel.
Structural Health Monitoring System Employing Smart Sensor Technology Part 1: Development and Performance Test of Smart Sensor
Heo, Gwang Hee ; Lee, Woo Sang ; Kim, Man Goo ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 134~144
In this study, a smart sensor unit is developed by using the smart sensor technology that is being rapidly developed in recent years for structural health monitoring system, and its performance is evaluated through various experiments, and also, damage detection experiment is performed on a model structure. This paper as the first half of this study contains the development and performance evaluation of the smart sensor. In the latter half of this study, structure damage detection experiment is performed for the application of verified smart sensor unit into structural health monitoring, and it is compared with a wire measurement system. The smart sensor is developed by using high-power wireless modem, MEMS Sensor and AVR microcontroller, and an embedded program is also developed for the control and operation of the sensor unit. To verify the performance of the smart sensor, many experiments are performed for sensitivity and resolution analysis tests, data acquisition by using cantilever beam and shaker, and on-site application using actual bridge. As a result, the smart sensor proves to be satisfactory in its performance.
An Experimental Study on the Shear Behaviour of Face Brick Wall Tied with the Screw Connector
Kwon, Ki Hyuk ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 145~154
As buildings are built higher and their service life made longer, face brick walls are also required to be constructed in an easy and systematic manner, and to ensure their satisfying structural performance, inspectingly, against lateral load. Therefore this study aims to investigate the structural performance of face brick walls constructed by a new method using screwed stainless steel connectors and provide fundamental experiment data for field application of this method. The results of this study indicated that the face brick wall tied with screw connectors had better shear capacity against rocking motion than that of the wall constructed with ordinary tie bars when their tie spacing was the same. Based on the good performance of the wall tied with the screw connector, it is also expected that the spiral anchors developed in this study can possibly applied to high-rise by adjusting the spacing of the anchors considering the difference of dimensions.
Estimation of Optimum PP Fiber Content for the Spalling Control of High Strength Reinforced Concrete Columns
Kim, In Ki ; Yoo, Suk Hyeong ; Shin, Sung Woo ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 155~163
High Strength Concrete (HSC) has weakness that in a fire, it is spalled and brittles. The phenomenon of spalling is made by water vapor's (resulting from evaporation in the material at over
)' being confined in watertight concrete. As the concrete strength increases, the degree of damage caused by the spalling becomes more serious because of the permeability. It is reported that the polypropylene(PP) fiber has an important role in protecting concrete from spalling and the optimum dosage of PP fiber is 0.2%. This study was conducted on the nonreinforced concrete specimens. The high-temperature behavior of high-strength reinforced concrete columns with various concrete strength and various dosage of PP fibers was investigated in this study. The results show that the ratio of unstressed residual strength of columns increases as the concrete strength increases and the ratio of unstressed residual strength of columns increases as the dosage of PP fiber increases from 0% to 0.2%, however, the effect of fiber dosage on residual strength of column barely changes above 0.2%.
Determination of Surge Tank Scale for Dam Safety Management
Lee, Ho Jin ;
Journal of the Korea institute for structural maintenance and inspection, volume 11, issue 2, 2007, Pages 164~174
Phenomena of hydraulic transient such as water hammer should be analyzed to design the pipeline systems effectively in dam. Surge tanks generally are used to reduce change in pressure caused by hydraulic transient from load changes on the turbines. In this study, the appropriate scale of surge tank with chamber is investigated for dam safety management. The variation of water level in the surge tank are computed using governing equation. Using the Thoma-Jaeger's stability condition, static and dynamic stability are investigate for the cases of flood water level, normal high water level, rated water level and low water level. Finally appropriate diameters of shaft and chamber are determined in the surge tank with chamber.