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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
Editor in Chief :
Volume & Issues
Volume 10, Issue 6 - Nov 2006
Volume 10, Issue 5 - Sep 2006
Volume 10, Issue 4 - Jul 2006
Volume 10, Issue 3 - May 2006
Volume 10, Issue 2 - Mar 2006
Volume 10, Issue 1 - Jan 2006
Volume 10, Issue 1 - Jan 2006
Selecting the target year
Construction of Design Table for Envelope Curve Analysis of Base Isolated Buildings
Lee, Hyun-Ho ; Cheon, Yeong-Soo ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 59~67
The aim of this study is to evaluate the design table for envelope curve analysis of base isolated buildings, which represent the period of base isolated buildings and the lateral displacement of base isolation devices. For the construction of design table,
spectrum, which represents the energy, is developed instead of acceleration of seismic hazard. Based on the seismic coefficient of UBC 97, boundary period
and maximum velocity response
are proposed considering Korea seismic hazard. Using
spectrum is developed for the four types of soil conditions. Base on the
spectrum, design table for envelope curve analysis is also developed for soil types.
An Experimental Study on the Physical Properties of Concrete Spread with Liquefied Organic and Inorganic Complex Antibiotics
Kim, Mu-Han ; Kim, Jae-Hwan ; Jo, Bong-Suk ; Lee, Eui-Bae ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 67~75
Recently sewage facilities mainly consisted of concrete structures are being deteriorated seriously by biodeterioration originated from sulfur-oxidizing bacteria. In this study, to prevent biochemical corrosion of the sewer concrete, antibiotics which prevent growth of sulfur-oxidizing bacteria were developed and antimicrobial performance of it was investigated. After that, to consider applicability of antibiotics to concrete, physical properties of concrete spread with antibiotics were investigated. As a results of the study, it was proved that the antimicrobial performance of antibiotics was available. Also compressive strength and bond strength of concrete didn't closely connected with antibiotics, and resistance to abrasion, water absorption and air permeability of concrete was improved remarkably by spraying with it.
Concrete Shear Strength of FRP Bar Reinforced Concrete BeamAccording to Variation of Flexural Reinforcement Ratio
No, Kyeung-Bae ; Jin, Chi-Sub ; Jang, Hui-Suk ; Kim, Hee-Sung ; Hwang, Geum-Sik ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 76~82
The concrete shear strength of FRP Bar reinforced concrete beam according to the variation of flexural reinforcement ratio was investigated. A number of experimental result showed that the concrete shear strength was lower than that of RC beam, but it was increased according to the increasement of reinforcement ratio. Shear strength correction factors considering the kind and reinforcement ratio of FRP Bar was proposed using the proposed formula in the literature and regression analysis of the experimental result.
An Experimental Study of Spalling Characteristics of High-Strength Reinforced Concrete Columns with PP Fibers
Sin, Sung-Woo ; Yu, Suk-Hyeong ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 83~90
A spalling is defined as the damages of concrete exposed to high temperature during the fire by causing cracks and localized bursting of small pieces of concrete. It is reported that spalling is caused by the vapor pressure and polypropylene(PP) fiber has an important role in protecting from spalling. The characteristics of fire resistance of high-strength reinforced concrete columns with various concrete strength and various contents of PP fiber were investigated in this study. In results, the ratio of unstressed residual strength of columns increases as the concrete strength increases and the ratio of unstressed residual strength of columns exposed to fire decreases as the content of PP fiber increases from 0% to 0.2%.
A Study of the Thermal Analysis for the Crack Control of Underground Pier Footing
Park, Weon-Tae ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 91~101
Lately, massive concrete structures are increasingly built. In such massive structures, the heat of hydration of mass concrete causes thermal cracks. To avoid thermal crack, methods widely acceptable for practical use are pre-cooling, pipe cooling and control of placing height. Thermal stress analysis is performed to find the way of controlling the thermal crack of pier footing mat in this paper. The footing mat model for the analysis is
area and 3m height. The analysis results are compared with method of control of lift height and method of pipe cooling. The analysis results show that thermal crack can be removed by method of placing control and pipe cooling at footing mat placed on the ground.
Ultimate Behavior of Steel Beam Strengthened with External Tendonand Cylindrical Anchorage
Choe, Dong-Ho ; Jeong, Sang-Hwan ; Jung, Jae-Dong ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 102~110
This paper examines experimentally the ultimate behavior of I-type steel beam strengthened with external tendon and cylindrical anchorage and analyzes the strengthening effect on the parameters such as initial tendon force, eccentricity, number of strands, and strand areas. The experiment demonstrated that increasing the number of strands, strand areas and eccentricity is more effective than increasing initial tendon force. The proposed cylindrical anchorage system has advantages in applying these parameters. The results showed that the cylindrical anchorage system is efficient and applicable to strengthen steel beam.
The Development of Bridge Weigh-in-Motion System for the Measurement of Traffic Load
Park, Min-Seok ; Jo, Byung-Wan ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 111~123
In the design of bridges, exact evaluation of traffic loading is very important for the safety and maintenance of bridges. In general, traffic loading is represented by live load (including impact load) and fatigue load. For exact evaluation of traffic loading, it is important to get reliable and comprehensive truck data including the traffic and weight information. It requires the development of Bridge Weigh-In-Motion (BWIM), which measures the truck weights without stopping the traffic. Objectives of the study is (1) to develop the BWIM system, (2) to verified the system in bridges in Highways.
An Optimum Design of Steel Frames by Second Order Elastic Analysis
Park, Moon-Ho ; Jang, Chun-Ho ; Kim, Ki-Wook ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 123~133
The main objective of this study is to develop an optimization algorithm of framed structures with rigid and various semi-rigid connections using the multilevel dynamic programming and the sequential unconstrained minimization techniques (SUMT). The second-order elastic analysis is performed for steel framed structures. The second order elastic analysis is developed based on nonlinear beam-column theory considering the bowing effect. The following semi-rigid connections are considered; double web angle, top-seat angle and top-seat angle with web angle. We considered the three connection models, such as modified exponential, polynomial and three parameter model. The total weight of the structural steel is used as the objective function in the optimization process. The dimensions of steel cross section are selected as the design variables. The design constraints consist of strength requirements for axial, shear and flexural resistance and serviceability requirements.
Development of Bond Strength Model for FRP Plates Using Back-Propagation Algorithm
Park, Do-Kyong ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 133~144
In order to catch out such Bond Strength, the preceding researchers had ever examined the Bond Strength of FRP Plate through their experimentations by setting up of various fluent. However, since the experiment for research on such Bond Strength takes much of expenditure for equipment structure and time-consuming, also difficult to carry out, it is conducting limitedly. This Study purposes to develop the most suitable Artificial Neural Network Model by application of various Neural Network Model and Algorithm to the adhering experiment data of the preceding researchers. Output Layer of Artificial Neural Network Model, and Input Layer of Bond Strength were performed the learning by selection as the variable of the thickness, width, adhered length, the modulus of elasticity, tensile strength, and the compressive strength of concrete, tensile strength, width, respectively. The developed Artificial Neural Network Model has applied Back-Propagation, and its error was learnt to be converged within the range of 0.001. Besides, the process for generalization has dissolved the problem of Over-Fitting in the way of more generalized method by introduction of Bayesian Technique. The verification on the developed Model was executed by comparison with the resulted value of Bond Strength made by the other preceding researchers which was never been utilized to the learning as yet.
A Study on the Properties of Fire Endurance and Spalling of High Performance RC Column with the Finishing and Covering Material
Han, Cheon-Goo ; Hwang, Yin-Seong ; Ji, Suk-Won ; Kim, Kyoung-Min ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 143~152
High performance concrete(HPC) has been widely used in high-rise building. The HPC has several benefits including high strength, high fluidity and high durability. However, spalling is susceptible to occur in HPC and HPC also tends to be deteriorated in the side of fire resistance performance at fire. This paper investigated the spalling prevention of high performance RC column. Control concrete showed severe failure and a case of concrete with fire enduring spraying material exhibited more severe spalling failure than even control concrete. In addition, concrete with fire enduring paint reported the most favorable spalling resistance effect for preventing spall, compared with other concrete covered with finishing materials, such as fire enduring spraying material, gypsum board, marble board and fire enduring PC board. Meanwhile, concrete adding 0.1% of PP fiber demonstrated spalling resistance performance after 3hours load bearing test.
Damage Detection of Beam by Using the Reduction Ratio of Natural Frequency and the Neural Network
Ghoi, Hyuk ; Lee, Gyu-Won ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 153~165
A damage in a structure changes its dynamic characteristics such as natural frequencies, damping ratios, and the mode shapes. In this paper the effort has been spent in obtaining the characteristics of the reduction ratio in natural frequencies and the damage detection is performed using the reduction ratios. Most of the emphasis has been on using the artificial neural network to determine the location and the extent of the damage as well as the existence of the damage. The data for learning and verifying neural network were obtained from the analytical analysis. The data have no errors. Considering the real measurements the data including errors which are difference this study between other studies also were used for neural network. The position and extent of the damage can be detected using the neural network trained by reduction ratios of natural frequencies.
Flexural Strengthening with Wire Rope Using the Tightening Force of Bolts
Kim, Sun-Young ; Song, Jin-Gyu ; Lee, Yeong-Wook ; Byeon, Hang-Yong ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 165~176
This paper deals with the experiment and construction case of concrete beams strengthened with wire rope using the tightening force of bolts. The mechanical bolting of wire rope for prestressing force is adopted, which is very easy for construction. For the flexural strengthening effect of the proposed method, the experiment was proceeded as follows. The main parameters of specimens, concrete strength is 24MPa, are initial prestressing forces of wire rope and the number of saddle. The flexural strengths of strengthened specimens compared with non-strengthened test piece were increased about 160%. Also, as the initial prestressing forces were increased, the crack and ultimate moments were increased. The number of saddle did not play an important role for the moment capacity. This proposed method as a construction example showed a more competitive method than any others.
Flexural Analysis of Reinforced Concrete Members Strengthened with FRP Systems Based on Strength Method
Cho, Baik-Soon ; Kim, Seong-Do ; Cheung, Jin-Hwan ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 175~186
Strength method for determining nominal moment capacity of reinforced concrete members is also assumed to be suitable for strengthened members with FRP system. If the internal tensile forces of the strengthened member from steel and FRP is insufficient, the FRP system strain might become greater than its ultimate tensile strain which makes the strength method a contradiction and unapplicable. The experimental results of 27 strengthened beams with carbon fiber sheets which have relatively lower tensile forces from steel and FRP show that not only concrete compressive strain is lower than 0.003 but also measured ultimate moment was lower than nominal moment using the strength method.
A Case Study on the Method to Improve on the Structure of Oil Tank
Yoon, Tae Gook ; Lee, Song ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 185~190
This study carried out an evaluation of an oil tank that was defective in structure. This paper is divided into two sections which are analysis for the working process and suggestion for improving on the structure of the oil tank. As stated above, it has three major factors as to an improvement, such as the life cycle of structure (especially physical life cycle), and the many factors related to the duration years of the oil tank and analysis result. Based on this study, the improvement of oil tank was established. For example, the ground investigation needs before design and construction of oil tank, and constructing the oil tank by retaining wall type tank is good for maintenance. Also, it is important that the system for drainage is related to maintenance.
An Experimental Study on Health Monitoring System of Smart Structure
Yoon, Hee-Jun ; Yoo, Byung-Eok ; Han,, Chang-Pyong ; Ahn, Hyung-Joon ;
Journal of the Korea institute for structural maintenance and inspection, volume 10, issue 2, 2006, Pages 191~202
Computer programs for a structure design help the optimum design that considers each condition. however, the findings can not explain accurately a behavior of the real-living structure because each condition of a structure is simplified and generalized. The smart structure is introduced to overcome these problems, and we can understand a behavior of the real-living structure by means of Health Monitoring System. In this study, we compare a behavior by means of the existing structure design with a behavior of the living structure by means of an experiment. As a result, we examine adequacy of a measuring system and developing possibility in the future.