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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 19, Issue 3_6 - Nov 1999
Volume 19, Issue 2_6 - Nov 1999
Volume 19, Issue 1_6 - Nov 1999
Volume 19, Issue 3_5 - Sep 1999
Volume 19, Issue 2_5 - Sep 1999
Volume 19, Issue 1_5 - Sep 1999
Volume 19, Issue 3_4 - Jul 1999
Volume 19, Issue 2_4 - Jul 1999
Volume 19, Issue 1_4 - Jul 1999
Volume 19, Issue 3_3 - May 1999
Volume 19, Issue 2_3 - May 1999
Volume 19, Issue 1_3 - May 1999
Volume 19, Issue 3_2 - Mar 1999
Volume 19, Issue 2_2 - Mar 1999
Volume 19, Issue 1_2 - Mar 1999
Volume 19, Issue 3_1 - Jan 1999
Volume 19, Issue 2_1 - Jan 1999
Volume 19, Issue 1_1 - Jan 1999
Selecting the target year
The Analysis for the Long Term Behavior of Composite Girder Bridges
Kwak, Hyo-Gyoung ; Seo, Young-Jae ; Park, Young-Ha ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 1~1
This paper deals with the analysis for long-term behavior of composite girder bridges. Time dependent behavior of composite bridge due to the creep and shrinkage of concrete are analyzed. To consider the varying material properties through the sectional depth, the layer approach in which a section is modeled by imaginary layers is adopted. The element stiffness matrix is constructed according to the assumed displacement field formulation and the creep and shrinkage effects of concrete are considered with the first-order algorithm based on the expansion of creep compliance function. Using the developed algorithm, the long-term behaviors of composite girder bridges are analyzed and the characteristics of time-dependent behaviors following the bridge types are discussed in detail.
Derivation and Application of the Dynamic Stiffness Matrix of an Inclined Cable
Ahn, Sang-Sup ; Chang, Sung-Pil ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 19~19
Due to the chord-wise component of the self-weight, the configuration of an inclined cable in the static equilibrium is not symmetric about the mid point of the span differently from the horizontal cable. This causes an inclined cable to have the hybrid modes and the amplified tension at the specific sag ratio and affects the dynamic stiffness, which is derived from the solution of the equation of motion. This paper researches the characteristics and aspects of the dynamic stiffness matrix of an inclined cable considering the chord-wise component of the self-weight and compares the results with other research. Furthermore, in order to emphasize the applicability and the effectiveness of the derived dynamic stiffness, dynamic analysis of the simple beam-cable structure is performed. It was found that the inclined cable always presents the hybrid modes and that the dynamic stiffness in this paper represents larger values than the previous dynamic stiffness. Using the dynamic stiffness to analyze the structure makes the analysis done with ease and one can predict the overall behavior of the structure.
Torsional Free Vibration of Suspension Bridges Considering Shear Deformation Effects
Kim, Moon-Young ; Kim, Nam-Il ; Kwon, Soon-Duck ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 29~29
In the previous papers by the present author. analytic and finite element solutions on the natural frequences of suspension bridges were consistently presented based on Timoshenko's beam theory extended from Abdel-Ghaffar's theory in order to investigate dynamic characteristics of suspension bridges. In this study. torsional free vibration theory of suspension bridges is developed by using the shear deformable thin-walled beam theory Both analytic and finite element solutions considering the effects of the shear deformation on torsional behaviors are presented in order to evaluate natural frequences and mode shapes of suspension bridges. Resultantly, the validity and accuracy of the present torsional vibration theory are demonstrated through numerical examples.
Wheel Load Distribution of Skew Reinforced Concrete Slab Bridges
Oh, Byung-Hwan ; Shin, Ho-Sang ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 43~43
The skew reinforced concrete slab bridges are very common in national roadways as well as in highways. The current Korea bridge design code specifies the wheel load distribution width only as a function of span length for straight bridges, and does not specifies wheel load distribution for skew slab bridges. However, the AASHTO LRFD bridge code specifies the increase of wheel load distribution width according to skew angle in skew slab bridges directly. The major variables such as span length, bridge clear width, boundary condition the existence of edge beam and skew angle, that affect the wheel load distribution width in reinforced concrete skew slab bridge, are investigated. A new formula for wheel load distribution width in skew bridges is proposed through nonlinear regression analysis of computed actual values. The proposed formula can be used efficiently for the accurate design of reinforced concrete skew slab bridges and also for realistic rating of those bridges in service.
A Statistical Study on the Lateral Confinement Effects of Spirally-Reinforced High-Strength Concrete Columns
Park, Hoon-Gyu ; Jang, Il-Young ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 53~53
Recently the use of high-strength concrete is rapidly increasing for the construction of column members. But the concrete may cause a serious brittle failure due to earthquake and wind loads. Therefore, in the case of high-strength concrete columns, confinement has been suggested as a means to improve ductility of column. With the addition of spiral or hoop reinforcement which lead to triaxial compressive state, ductility behavior of high-strength column member shall be increased. In this study, rational qualify and quantify evaluations were made to investigate the confinement effect of the spirally-reinforced concrete. Concrete failure theory at the triaxial compressive state and statistical results based on conventional experimental data were applied for this propose. Analytical results show that confinement stress, maximum compressive strength, increase of strain equations were developed with the consideration of concrete strength, yield strength of spiral reinforcement and spacing, and volumetric ratio of spiral reinforcement.
A Study on the Spectra of Road Surface Roughness on Highway Bridges
Park, Young-Suk ; Chung, Tae-Ju ; Shin, Dong-Ku ; Lee, Won-Tae ; Cho, Sung-Woo ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 67~67
The power spectral densities (PSD) for the road surface roughness of highway bridges are presented. To obtain the PSD, the road surface roughnesses of 25 different bridges, in domestic highways, with various superstructure types, pavements, and span lengths are measured by the Intelligent Total Station at every 10 to 30cm interval. Assuming the PSD as the stationary normal probability process with a zero mean value, the PSD's of the measured road surface roughness are obtained by applying the maximum entropy method (MEM). A simple formula in evaluating the PSD which is applicable to the dynamic response analysis of bridges considering the road surface roughness is proposed. Using the calculated PSD curves, the road surface conditions on the 25 bridges are evaluated. The statistical relationships between the PSD and the IRI are presented by applying the linear regression and correlation analyses.
Development of Four Parameter Failure Envelope for Three-Dimensional Constitutive Modeling of Concrete
Lee, Yong-Hak ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 79~79
A novel triaxial isotropic loading function is developed in terms of three invariants which enforce smoothness throughout the cone- and cap-regions. Evolution of the loading function in the pre-peak region is defined by two friction, one cohesion, and one closing parameters. Contraction of the loading function in the post-peak region is described by fracture energy concepts in terms of a single decohesion parameter. A transition point distinguishes between brittle from ductile response regimes where no softening takes place. Vertex problem resulting in numerical complexity does not exist due to the inherent nature of the loading function maintaining
and convexity throughout the entire response regime. The anisotropic evolution of the loading function is also proposed by differentiating between the friction and the cohesion parameters. In the companion paper several numerical simulations of distributed and localized progression on the constitutive level as well as structure levels will be presented.
Three-Dimensional Elasto-Plastic Constitutive Modeling of Concrete Based on Four Parameter Failure Envelope
Park, Kil-Hyun ; Lee, Yong-Jae ; Lee, Yong-Hak ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 89~89
A comprehensive constitutive model is presented for the triaxial behavior of plain concrete. The formulation covers the full-response spectrum in tension as well as in compression. The concrete model employing the four parameter failure envelope recently developed is based on the incremental theory of elasticity. Isotropic strain hardening and fracture energy-based strain softening are used to capture brittle and ductile failures. The numerical algorithm to calculate the plastic multiplier adopts the full consistency condition in which the initial guess of the plastic multiplier is determined using the linearized consistency condition. The limitation on using an associated flow rule is discussed which is observed in the numerical analysis of concrete subjected to confining pressure. Subtle aspects of corner problems are inherently Prevented owing to the role of
of the loading function. This study concludes with several numerical simulations of distributed and localized progression on the constitutive as well as structure levels.
Replacement of Bearing System for PSC Beam Bridges Considering Safety of Bridge Deck
Park, Sun-Kyu ; Kim, Jung-Hyuk ; Kim, Hyeong-Yeol ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 101~101
In the replacement of bearings of bridges, the superstructure is needed to be jacked up to provide an enough clearance for the replacement work. Since the jacking force may cause damage to the superstructure, the response of superstructure under jacking loads must be considered. In the calculation of allowable jacking force and overall jacking sequence, especially, for PSC beam bridges, the consideration of stress concentration at the beam and load distribution of the slab is essential. In this study, an analytical method is proposed to calculate the jacking force and overall jacking sequence for the replacement of bearing system by considering the response and safety of superstructure. The stress concentration at the beam and load distribution of the slab due to jacking forces are considered to compute the allowable jacking force for each beam and overall jaking sequence for the beams in the superstructures. Based on the proposed method in this study, a solution algorithm is developed and it is coded as a computer program. This paper also includes the results of analysis for a standard PSC beam bridge to show the validity and efficiency of the proposed method.
A Fundamental Study on the Utilization of Electric Arc Furnace Slag as Aggregate for Porous Concrete Pavement
Moon, Han-Young ; Kim, Seong-Soo ; Jung, Ho-Seop ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 111~111
Porous pavement makes rainwater drain through it. This drained water is supplied to a road tree and helpful to secure underground water and micro-organism, Therefore, the porous pavement structure can be environmentally friendly. In this study, sand and crushed stone were replaced by electric arc furnace slag aggregates partially or fully to investigate the applicability of those for the porous concrete aggregates. Parameters include coefficient of permeability and compressive strength. In shape and percentage of solids, the coarse aggregates of electric arc furnace slag were equivalent to the crushed stone after aging in air. Experimental data in this study showed that the specific gravity, unit weight were high and abrasion resistance was low. Therefore, it can be concluded that the electric arc furnace slag as aggregate can be used for the porous concrete pavement.
Improvements in the Design-Build Contract Clauses Based on Claim Cases
Kim, Kyung-Rai ; Lee, Tai-Sik ; Lee, In-Keun ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 123~123
The previous research was conducted to improve the existing contract clauses. However, results of the research were not satisfied due to limitation of the research method, which was comparison of the existing clauses with those of developed countries, such as FIDIC(Federation Internationale Des Ingenieurs Consuils) or C.O.E (US Army Corps of Engineers). Therefore, empirical study based on the cases is used in this research instead of the above method. The claim cases of the second Seoul Subway Construction Project are used and risk management is applied to analyze cause of the claims. Finally, improvements in the design-build contract clauses are suggested based upon the claim analysis.
Analysis on Risk and Liability of Design Engineers in Korean Civil Law and Study on Betterment
Lee, Tai-Sik ; Ryoo, Boong-Yeol ; Lee, Yong-Il ;
Journal of The Korean Society of Civil Engineers, volume 19, issue 1_1, 1999, Pages 133~133
Liability on civil law contains contractual liability and liability of illegal conduct. In this liability, there are many problems such as risk allocation, responsibility of a surety, applying liability without fault to default of an obligation and contractual inequality. Korean domestic civil law was analyzed level of the contractual responsibility of a surety and surety-liability, criteria of duties and rights, range of liability of engineer and risk allocation. Engineers legal responsibility was determined and proper legal clauses were suggested