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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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Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 27, Issue 6D - Nov 2007
Volume 27, Issue 6C - Nov 2007
Volume 27, Issue 6B - Nov 2007
Volume 27, Issue 6A - Nov 2007
Volume 27, Issue 5D - Sep 2007
Volume 27, Issue 5C - Sep 2007
Volume 27, Issue 5B - Sep 2007
Volume 27, Issue 5A - Sep 2007
Volume 27, Issue 4D - Jul 2007
Volume 27, Issue 4C - Jul 2007
Volume 27, Issue 4B - Jul 2007
Volume 27, Issue 4A - Jul 2007
Volume 27, Issue 3D - May 2007
Volume 27, Issue 3C - May 2007
Volume 27, Issue 3B - May 2007
Volume 27, Issue 3A - May 2007
Volume 27, Issue 2C - Mar 2007
Volume 27, Issue 2A - Mar 2007
Volume 27, Issue 2D - Mar 2007
Volume 27, Issue 2B - Mar 2007
Volume 27, Issue 1D - Jan 2007
Volume 27, Issue 1C - Jan 2007
Volume 27, Issue 1B - Jan 2007
Volume 27, Issue 1A - Jan 2007
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Development of Live Load Moment Equations for Decks Using Orthotropic Plate Theory
Ahn, Ye-Jun ; Nam, Suk-Hyun ; Park, Jang-Ho ; Shin, Yung-Seok ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 647~653
Because of the orthotropic elastic properties and a significant two-way bending action, orthotropic plate theory may be suitable for describing the behavior of concrete-filled steel grid decks. In AASHTO LRFD Bridge Design Specification(2004), the equations for live load moment consider a ratio of flexural rigidity between longitudinal and transverse directions, but not in the Korea design specification of highway bridge (2005). The Korea LRFD bridge standard specification of highway(1996) includes an orthotropic plate model with single load to estimate effects induced by live load moments of concrete-filled steel grid decks. However, the orthotropic plate model considering only single patch load may not be conservative. This paper presents live load moment equations for truck and passenger car, based on the classical orthotropic plate theory, which includes multiple patch loads. Design factors and live load models of Korea standard specification of highway bridge is applied to proposed formulations.
Derivation of Equivalent Uniformly Distributed Load due to Overburden Live Load in the Underground Rigid Frame Bridge
Shim, Jeong-Bo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 655~660
Upper slab has normally been assumed as a simple beam when uniformly distribute loads under DB load are transformed into an equivalent uniformly distributed load. It is thus added in the present technical note that upper slab can also be assumed as a beam with fixed restraint at both ends. In line with the above, soil depth is firstly divided into three groups. For each group of soil depth, equivalent uniformly distributed load is calculated in term of four different span lengths for a rigid frame bridge. The larger equivalent load is selected amongst the loads under a simple beam and a fixed-ends beam.
Web-based Design Automation System of 2 Span Continuous RC-Slab Bridge
Lho, Byeong-Cheol ; Lee, Jin-Wook ; Kim, Jeong-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 661~669
2 span continuous RC-slab bridge is one of structures employed for the provincial road construction because of its simplicity in design and construction. In this paper, Web-based automation system has been developed to not only manage resultant documents but also speed up to repetitive design process. The combination of internet technologies provides a foundation for developing a Web-based parametric design support system that may facilitate the design process of 2 span RC-slab bridge as well as the manipulation of the resultant engineering documents. This application is able to implement all engineering calculation, CAD drawings, and itemized statements of quantities by using XML Data Island in 2 span RC-slab bridge. This paper introduces a Web-based application, which is able to operate anytime and anywhere, is developed to not only speed up the design process but also enhance the collection and manipulation of resultant electronic documents.
Ultimate Flexural Strength of Reinforced Concrete Beams Strengthened using CFRP Tendon
Park, Sang-Yeol ; Yang, Chul-Young ; Kim, Chang-Hoon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 671~679
This study deals with literature review, developing a predicting equation for the ultimate stress of prestressing CFRP, and experimental test with the parameters affecting the ultimate stress of prestressing CFRP in reinforced concrete beams strengthened by external prestressing. The ACI (American Concrete Institute) predicting equation for the ultimate stress of unbonded prestressing steel is analyzed to develop a new integrated predicting equation for CFRP. The proposed predicting equation takes rationally the effect of internal reinforcing bars and external prestressing CFRP into consideration as a function of prestressing tendon depth to neutral depth ratio. In the experimental study, reinforced concrete beams strengthened using external prestressing CFRP are tested with the test parameters having a large effect on the ultimate stress of prestressing CFRP. The test parameters includes the amount of reinforcing bar and external prestressing tendon reinforcement, and span to depth ratio. The test results are analyzed to confirm the rationality and applicability of the proposed equation for predicting the ultimate stress of external prestressing CFRP.
Evaluation of Effective Length Factors for Steel Frames Using Modified Elastic Buckling Analysis
Choi, Dong-Ho ; Yoo, Hoon ; Shin, Jay-In ; Kim, Sung-Yeon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 681~689
The determination of effective buckling length by elastic buckling analysis uses eigenvalue analysis of the overall structure, and it has been widely used in the practical design of steel frames because this method can be performed effectively and automatically. However, elastic buckling analysis can lead to large effective length of members in certain stories that are exerted relatively small axial force. This paper proposes a new method of elastic buckling analysis to calculate the effective buckling length factor of all members in steel- frames. The proposed method modifies the terms of a geometric stiffness matrix by using a fictitious axial force factor and performs an iterative eigenvalue analysis. Six-stories steel frames are analyzed in order to verify the proposed method by comparing with AISC story-based methods, stiffness distribution factor method and elastic buckling analysis. The result shows that the proposed method can adequately evaluate effective length factors of all members in steel frames.
Structural Integrity Assessment of Beam Type Structures Using Substructural Identification Technique
Koo, Ki-Young ; Yun, Chung-Bang ; Yi, Jin-Hak ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 691~699
This study proposed a method to estimate the bending stiffness of a bridge superstructure, which is one of the major indices of structural integrity of a bridge. During the estimation of structural condition using several identification methods, it is required to consider the condition of boundary conditions such as bearing devices and abutments very precisely since the boundary conditions can be changed significantly by aging and temperature effects. To overcome this shortcoming, a new substructural identification method is proposed to evaluate the bending stiffness of a bridge superstructure without considering the boundary conditions by isolating the estimation domain into the internal substructure. Since the propose method doesn't require any complex and complicate experimental modal analysis to obtain modal properties, this technique can give an important role to enhance the current automated instrumentation facilities. Proposed method is verified by an experimental study using a simple beam model with several different boundary conditions, a numerical simulation study using a steel box girder bridge model and an experimental study using a steel box girder bridge with different structural damage conditions.
Radial 3-D Elastodynamic Infinite Elements
Seo, Choon-Gyo ; Yun, Chung-Bang ; Kim, Jae-Min ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 701~711
This paper presents new three dimensional radial infinite elements for soil-structure-interaction problem in a multi-layered half-space. Three kinds of radial infinite elements, including horizontal, vertical and corner infinite elements, are developed in Cartesian coordinates using approximate wave propagation functions with multiple wave components. Numerical example analyses are presented for rigid arbitrarily shaped footings, and an embedded caisson on a homogeneous and layered half-space in frequency domain. The numerical results obtained show the effectiveness of the proposed infinite elements.
Analysis of the Effect of Strain Rate on the Concrete Structures using Coupled ADLE-Elasto Viscoplastic Finite Element Method
Lim, Yun-Mook ; Park, Ju-Wan ; Shin, Seung-Kyo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 713~723
From the material point of view, concrete shows an increase in tensile strength and compressive strength as the strain rate increases, and the change in failure mode from ductile to brittle also happens. Thus, understanding the behavior of concrete subjected to high strain rate loading such as earthquake or impact is essential. This study proposes a numerical method that can predict the strain rate effect of concrete. Developed numerical model uses coupled axial deformation link element (ADLE) and elasto-viscoplastic element as a basic element. To verify the numerical method, simulations of uniaxial and three-point bending specimen are performed and the predicted responses are compared with experimental results. Concrete beam-column is simulated to investigate the load-deflection response and failure mode under static and impact loading. A parameter study regarding strain rate from a value of 3?10-6/s to a value of 3?10-1/s is conducted to investigate the damage range of concrete and a limit value of strain rate from which the failure mode changes from ductile to brittle.
Evaluation of the Slip Coefficient and Influencing Factors in Slip-Critical Connections of Thick Steel Plate
Seong, Taek-Ryong ; Yoon, Tae-Yang ; Koh, Hyun-Moo ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 725~733
In this paper, the slip coefficient in slip-critical connections of thick steel plate was evaluated through the static tensile test considering the factors such as the plate thickness, the number of bolt columns and rows, and the filler. Considering connection limit state, the new slip coefficient criteria for thick steel plate connections were suggested. Parametric finite element analysis was performed and compared with the test results for investigating the influences which these factors had on the slip coefficients. The slip coefficients have satisfied the current design criteria. The increase in the plate thickness, the number of columns and the number of rows decreased the slip coefficient.
Flexural Behavior and Cracking Characteristics of High Performance Fiber Reinforced Cementitious Composites according to Fine Aggregate Contents
Shin, Kyung-Joon ; Jang, Kyu-Hyoun ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 735~743
Various methods have been used to reinforce the cementitious material such as mortar and concrete that have weak tensile strength. Major reinforcing method is to mix matrix with fibers which have strong tensile strength. Recently, High Performance Fiber Reinforced Cementitious Composites (HPFRCC) has been developed which shows multiple cracking behavior, that is different from conventional FRC. Related studies mainly have focusing on the mechanical behaviors according to fiber types and mixture proportions such as W/C and binder contents. However, study related to fine aggregate type and contents are insufficient. Therefore, this paper examines the fracture characteristics related to fine aggregate and contents, and reports the cracking behavior as well as mechanical behavior for various mixtures which have different fiber type and mixture proportions. From the results, it was useful to use silica sand as a fine aggregate for reducing fracture toughness as maintaining compressive strength and elastic modulus. It is showed that optimal silica-cement ratio was 0.8~1.0 to maximize flexural toughness and number of crack.
A Study on Estimation for Chloride Diffusivity in Cracked Concrete in Harbor Structures through Field Survey
Kwon, Seung-Jun ; Park, Sang-Soon ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 745~752
Chloride attack in concrete structure is one of the most deterioration phenomena so lots of researches are focused on this field such as modeling and analysis of chloride behavior including material, design, and construction. However, one of the major object is to simulate the chloride behavior of existing structures and it is also important to evaluate it through the field survey. Generally researches for chloride behavior are focused on sound concrete but it is rarely carried out to evaluate and verify that in cracked concrete. Cracks in early-aged concrete, however, may occur inevitably through the mechanism such as cement hydration and shrinkage and they can be the main routes for deteriorating agent, which induce local steel corrosion. In this study, field survey for concrete structures exposed to sea water is performed and apparent diffusivities of chloride ion in sound concrete is evaluated. Furthermore, those in cracked concrete with 0.1, 0.2, and 0.3 mm crack width are also experimentally evaluated. The evaluated diffusivities in cracked concrete are expressed in terms of crack width and those in sound concrete and service life prediction for target structure is carried out through the relationship between them. Additionally, Utilizing the diffusion factor for crack effect from domestic specification, service life prediction is performed for the same structure, and comparison between the results from the derived relationship and those from domestic specification is also carried out. Through this study, chloride diffusivity with crack effect in domestic specification is evaluated to underestimated the chloride behavior and it is currently necessary to derive the quantitative crack effect through comprehensive field survey.
A New Test Method for Pure Isotropic Flexural Tensile Strength of Concretes
Zi, Goang-Seup ; Oh, Hong-Seob ; Choi, Jin-Hyek ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 753~758
Proposed is a new test method to measure the biaxial tensile strength of concretes or other quasibrittle materials. One of the most novel features of the method is that only one actuator is used unlike other biaxial tensile test methods. This method is a three dimensional version of the classical modulus of rupture test. The specimen for the test is a circular plate loaded by a circular edge and supported by another circular edge. They have the same center point. The moment within the circular edge on which the applied load is constant in any direction. The biaxial tensile strength of a concrete was measured using the new flexure test method. From the test result, biaxial tensile strength of circular plates is lower than the strength from the traditional theory on the modulus of rupture strength suggested by ACI 318-05. The biaxial tensile strength of concrete is significantly scattered, and its standard deviation is about quadruple of that of uniaxial strength allowed in ACI 318-05. Therefore, to establish on the characteristic of biaxial tensile strength which may be influenced by aggregates, size effect and compressive strength of plain concrete, further experimental and theoretical researches are required.
A Study on the Performance Tests of Polymer Cement Slurry-Coated Steels
Jo, Young-Kug ; Jeung, Sung-Pil ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 759~769
The purpose of this study is to evaluate the performance of polymer cement slurry-coated steels such as reinforcing bar and steel plate. Polymer cement slurry-coated steels, which is made from two types of polymer dispersions such as St/BA and EVA are prepared, and tested for viscosity, flow, tensile strength, corrosive resistance, bendability, adhesion, bond strength to cement concrete. From the test results, the workability of polymer cement slurry in the coating process at surface of reinforcing bar or steel plate is slightly improved according to containing of fly ash. The polymer cement slurry-coated steels have good adhesion, corrosive resistance, fairly good bendability and high bond strength. The corrosion resistance of polymer cement slurry-coated steels is improved to a great extent compared to that of plain steel. The thicker the coating, the weaker the bond strength to cement concrete. The bond strength of polymer cement slurry-coated reinforcing bars with coating thickness of 200±50 mm to cement concrete is not less than that of epoxy-coated bar. The coating thickness is very important factor to maintain the acceptable bond mechanism and goes well with the ASTM and those of Korean Concrete Institute. However, it needs a little thick coating thickness for other performances such as corrosion resistance, bendability. Therefore, it is impotance to have optimum mix proportions that get the balance between thickness and performance. The polymer films formed in polymer cement slurry play a great important role in improvement of performance of polymer cement slurry-coated reinforcing bar. In this study, it is apparent that the choice of polymer type, thickness, admixture and curing condition is important to improve the adhesion between polymer cement slurry and reinforcing bar, coated reinforcing bar and cement concrete.
Estimation of Critical Chloride Content for Corrosion of Reinforcing Steel in Concrete by Accelerated Corrosion Tests
Bae, Su-Ho ; Lee, Kwang-Myong ; Kim, Jee-Sang ; Kim, Young-Sang ;
Journal of The Korean Society of Civil Engineers, volume 27, issue 5A, 2007, Pages 771~776
To predict the service life of reinforced concrete structures exposed to chloride environment, quantitative measures of ma-terial properties such as the critical chloride content for corrosion of the reinforcing steel in concrete and the diffusion coefficient of the chloride ions of concrete are essential. However, it should be noted that they are influenced by several factors such as concrete mix proportions, cement type, and environmental conditions, etc. Thus, the purpose of this research is to estimate the critical chloride content for corrosion of the reinforcing steel in concrete by the accelerated corrosion tests. For this purpose, cylinder and prism concrete test specimens were made for water-cement (W/C) ratios of 31%, 42%, and 50%, and then the accelerated corrosion tests for them were conducted by electrochemical and cyclic wet and dry salt water method. During the test, corrosion monitoring by half cell potential method was carried out to detect the time to initiation of corrosion for test specimens and its chloride content was evaluated by breaking the concrete test specimens when corrosion of the reinforcing steel in concrete was perceived. It was observed from the test results that the critical chloride content for corrosion of reinforcing steel in concrete would be dependent on both W/C ratio and the type of the accelerated corrosion test, and the critical chloride content of the concrete test specimens used in the study were found to range from 0.91 to 1.63 kg/m3 (0.17~0.31% by weight of cement).