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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Civil Engineers
Journal Basic Information
Journal DOI :
Korean Society of Civil Engeneers
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Volume & Issues
Volume 18, Issue 3_6 - Nov 1998
Volume 18, Issue 2_6 - Nov 1998
Volume 18, Issue 1_6 - Nov 1998
Volume 18, Issue 3_5 - Sep 1998
Volume 18, Issue 2_5 - Sep 1998
Volume 18, Issue 1_5 - Sep 1998
Volume 18, Issue 3_4 - Jul 1998
Volume 18, Issue 2_4 - Jul 1998
Volume 18, Issue 1_4 - Jul 1998
Volume 18, Issue 3_3 - May 1998
Volume 18, Issue 2_3 - May 1998
Volume 18, Issue 1_3 - May 1998
Volume 18, Issue 3_2 - Mar 1998
Volume 18, Issue 2_2 - Mar 1998
Volume 18, Issue 1_2 - Mar 1998
Volume 18, Issue 3_1 - Jan 1998
Volume 18, Issue 2_1 - Jan 1998
Volume 18, Issue 1_1 - Jan 1998
Selecting the target year
Development of a New Analysis Method for Prestressed Concrete Box Girder Bridges
Oh, Byung-Hwan ; Lee, Myung-Gyu ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 749~749
The conventional design of prestressed concrete box girder bridges has been based on linear elastic analyses from simplified geometric models. To overcome the restriction involved in the simplication, a macro element for the rational analysis of prestressed concrete box girder bridges with variable cross section is formulated. In the present analysis the structure is considered as a linear assemblage of consecutive elements forming a substructure. To simulate realistic behavior of the concrete box girder bridges, the effect of prestressing is included in the macro element formulation. The advantage of using the macro element in the bridge analysis lies in the fact that it can model easily arbitrary geometries and support conditions of actual bridges. The proposed formulation can be used efficiently for the realistic analysis of prestressed concrete box girder bridges with arbitrary shapes.
Response Behaviors of a Harmonically Excited Impact System
Mha, Ho-Seong ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 761~761
Nonlinear behaviors of a barge/platform system under harmonic excitations are examined. The system is modeled as an impact system by combining a linear system inside the platform and impacting boundaries as the platform. The impact system is found to exhibit various types of responses. including harmonic, subharmonic, and highly nonlinear motions such as chaos. The sensitivity of the responses to variations in system, excitation and initial conditions are examined using direct numerical simulations, and the effect of energy dissipation occurring upon the impacting is observed. The conditions for the existence of chaotic and periodic responses are identified via parametric analysis, and the parametric maps are provided as a controlling space. Probabilistic properties of the chaotic motions of the impact system upon initial perturbations are also verified.
The Soil-Structure Interaction in Three Dimensional Rectangular Liquid Storage Tanks
Kim, Jae-Kwan ; Park, Jin-Yong ; Jin, Byeong-Moo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 775~775
A dynamic fluid-structure-soil interaction analysis method is developed to investigate the effects of three dimensional motion on the seismic response of flexible rectangular liquid storage tanks founded on the deformable ground. The governing equation for the dynamics of rectangular tanks subjected to the three dimensional base motion is obtained by applying Rayleigh-Ritz method. The dynamic stiffness matrix of the rigid surface foundation resting on a stratum is calculated by hyperelement method. The seismic response of the three dimensional flexible tank model founded on the deformable ground is analyzed by combining the governing equation of the structural motion with the dynamic stiffness matrix of rigid surface foundation. The sample analysis results reveals the salient features of the effects of soil-structure interaction on the seismic behavior of the liquid storage tanks.
Freeze-Thaw Resistance of High Strength Concrete Incorporating Fly Ash
Hong, Chang-Woo ; Yun, Kyong-Ku ; Park, Je-Seon ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 789~789
This paper presented on the experimental results of freeze-thaw resistance of high strength concrete incorporating fly ash. The main experimental variables were the substitution ratio of fly ash into cement, w/c, and with or without air-entraining admixture. The experiment on freeze-thaw resistance were executed following ASTMC 666 and KS F 2456. The results were as follows: The compressive strength of air-entrained concrete decreased as the substitution ratio of fly ash increased. The pozzolan effect of fly ash. the absorption of un-burnt carbon for air-entraining admixture. and the relationship between air amount and compressive strength should be considered in order to make high strength and durable concrete. The air-entrained concrete incorporating less than 15% of fly ash showed very good freeze-thaw resistance keeping durability factor more than 92%, however, it incorporating more than 30% of fly ash showed very poor freeze-thaw resistance indicating 4.4%-10.8% of durability factor regardless of water-cementitious ratio. The surface distresses of specimen increased as the water-cementitious ratio and the substitution ratio of fly ash increased. Thus, the surface distress should be considered in order to recycle high volume fly ash.
Determination Method for Longitudinal Prestressing Force in Precast Bridge Deck
Youn, Seok-Goo ; Shim, Chang-Su ; Chung, Chul-Hun ; Chang, Sung-Pil ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 799~799
This paper presents the test results of eleven full-scaled precast prestressed beam models of a 22 cm. thick and 2.5m girder-spacing prototype precast prestressed concrete bridge deck subjected to static and pulsating loads. The effect of the longitudinal prestressing force on the flexural behavior of the beam-shaped precast bridge deck with transverse joint is investigated and discussed. Due to the increment of prestressing force, the cracking load is increased and crack occurrence and the loss of the flexural stiffness are decreased. All the test specimens are failed with flexural mode and the ultimate load-carrying capacities are very similar to the predictions obtained by nonlinear analysis based on current code. On the basis of the test results and analysis, the required compressive prestress developed by longitudinal prestressing force is proposed to make sure the safety and serviceability of the precast bridge deck.
Time-dependent Deflection Analysis of Cracked Reinforced Concrete Beams
Lee, Tae-Gyu ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 811~811
In this paper, the prediction of the time-dependent deflection of cracked reinforced concrete beams is presented. The stiffness matrix of concrete elements considering the axial strain-curvature interaction effect is derived. In order to calculate the cracked sectional properties, the method which is directly used in the axial strain and curvature of the sectional centroid is developed. The creep and shrinkage properties used in the predictions were calculated in accordance with ACI 209. CEB-FIP 1990, and B3 model code. To demonstrate the validity of this algorithm, the prediction of this proposed method are compared with the results of other experimental work considering the unloading condition reported in the literature. The proposed method is shown to be in good agreement with experimental results.
A Study on Factors Influencing the Fracture Toughness of Mortar-Aggregate Interfaces
An, Ki-Seok ; Lee, Kwang-Myong ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 819~819
The interfacial zone in concrete materials is extensive, geometrically complex, and constitutes inherently weak zones that limit the concrete performance. Mortar-aggregate interfaces playa major role in the fracture processing in concrete composites. Furthermore, the interfacial bond considerably influences mechanical properties of concrete such as modulus of elasticity, strength, and fracture energy. Characterization of the interfacial properties is, therefore, essential to overcome the limitations associated with interfaces. In the present paper, factors influencing fracture toughness of mortar-aggregate interfaces are evaluated by testing sandwiched Brazilian disk specimens. It is observed from the test results that the interfacial fracture toughness increases with a greater shear loading effect. Both the mortar strength and the roughness of the aggregate surface strongly influence the interfacial fracture toughness but the aggregate type does not. It is also found that the interfacial fracture toughness increases with a proportional to the increase of mortar strength with ages.
Effect of the Bracing Types of Steel Framed Structures by Seismic Optimum Design
Park, Moon-Ho ; Cho, Chang-Geun ; Kim, Ki-Hong ; Chang, Chun-Ho ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 829~829
This study develops two algorithms for the design of braced steel frame structrues: the continuous and the discrete optimum design algorithms. For the seismic and wind design of structures, the time-history analysis of MDOF system is performed by the mode superposition method. In the optimization formulation, the objective function is the total weight of steel members and the design constraints are the ultimate strength requirements of LRFD 1994 code and the allowable story drift requirements of UBC code. In cross sectional design, the I-shaped built-up sections are used in the continuous optimization method and the W-shaped sections of AISC commercial products in the discrete optimization method. It was found from various examples of optimum design that the K-bracing is the most effective to resist the lateral seismic loads.
An Efficient Analytical Model for a 3-Dimensional Frame Structure with Setback
Moon, Seong-Kwon ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 841~841
An analytical model for a 3-dimensional frame structure with setback showing abrupt reductions of floor size within the structure height is presented. For a 3-dimensional setback structure, large in-plane deformation of floor slabs takes place at the line of setback, which affects the distribution of shear force among the lateral-load resisting elements in base part. To develop an efficient analytical model for a setback structure including in-plane deformation of floor slabs, a 3-dimensional frame structure is considered to be an assemblage of lateral-load resisting elements and floor slabs connecting two adjacent lateral-load resisting elements at each floor level. This modeling concept can be easily applicable to a setback structure with complex shapes. In order to investigate the accuracy of the proposed analytical model, two type of structural systems such as the frame and frame-shear wall systems are considered. Dynamic analysis results obtained using the proposed analytical model are in good agreement with those acquired using the three-dimensional finite element model in terms of natural vibration periods, mode shapes and displacement time history.
An Experimental Study on the Behavior of Reinforced Concrete T-Girder Bridges by Full-Scale Destructive Testing
You, Dong-Woo ; Song, Ha-Won ; Byun, Keun-Joo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 851~851
This study is on full-scale destructive testings of deteriorated RC T-Girder bridges for understanding the behaviors of the bridges, at both service and ultimate load levels. For the two existing RC T-Girder bridges, one bridge, by making two bridges by cutting the flange of the bridge longitudinally, is tested by 3-point bending for one girder bridge and 4-point bending for double T-Girder bridge respectively, and the other bridge is tested by one-lane loading pattern. This paper describes full-scale destructive tests including test set-up, loading devices and measurement plan and their failure behaviors. Experimental results indicate that deteriorated RC T-Girder bridges posess very high reserved strength despite their low ratings evaluated by current bridge assessment. It is also found that behaviors of the bridges are linear elastic under service loads and its initial stiffness is very much different from computational predictions based on idealized support conditions. Comparisons between analysis results and experimental results show that the manner of modeling support conditions of existing bridges significantly affects the bridge responses and the end restraints of deteriorated RC bridges posess about
fixity added to idealized simple support condition.
Soil-Structure Interaction Analysis Based on Analytical Frequency-Dependent Infinite Elements in Time Domain
Kim, Doo-Kie ; Yun, Chung-Bang ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 863~863
The direct method for soil-structure interaction(SSI) analysis in time domain is presented using analytical frequency-dependent dynamic infinite elements in two-dimensional medium. The equation of motion including the present frequency-dependent dynamic stiffness matrix for the far field region can be analytically and efficiently transformed into time domain equations. The behaviors of the present infinite elements in time domain are verified by comparing those of the other methods in time and frequency domains. The comparison indicates that the proposed method elements give accurate solutions in time and frequency domains.
Experimental Study on Fracture Energy of Low-Heat Concrete by Three-Point Bend Test
Jo, Byung-Wan ; Park, Seung-Kook ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 877~877
To analyze the fracture characteristics of Low-Heat concrete which is used to prevent the thermal crack caused by hydration heat, static loading test was performed by "Determination of the Fracture Energy of Mortar and Concrete by Means of Three-Point Bend Tests on Notched Beam" (suggested by RILEM 50-FMC Committee). Fracture energy of Mode I (opening mode) for the ordinary and low-heat concrete is compared and examined according to experimental variables, such as water-cement ratio, compressive strength and age. Test results show that the deflections at the fracture was decreased as the fracture strength was increased and the reduction of water-cement ratio caused to increase fracture energy in both specimens. The fracture energy of Low-Heat Concrete turned out to be similar to that of Ordinary Portland Concrete as the age increases.
Analysis on the Geometric Dimensions of Express Ways in Korea - Focus on Case Study -
Lee, Yang-Kyoo ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 887~887
This study analyzes the operation geometric dimensions such as public works and road facilities on the existing express ways, the result of which can be utilized to estimate the construction cost of prospective express ways. Three existing express ways are slected to present the geographical characteristics of plain, hilly and mountainous regions. The design information is presented by the proportion of each route to the total length. By its data, we can recognize that each geometric is different.
Decision Making Model for Bidding through Risk Assessment
Kim, Chang-Hak ; Kang, Leen-Seok ; Lee, Bae-Ho ;
Journal of The Korean Society of Civil Engineers, volume 18, issue 1_6, 1998, Pages 901~901
Recently construction industry involves more risks occurred with increase of size and complexity of construction works. So the appropriate bidding strategy plays an important role in making a success of construction. Most of bidding decisions, however, have just depended on bidder's intuition, experience and conjecture because of the lack of reasonable decision making criteria. Consequently, scientific criteria including risk analysis have disregarded in decision making process for bidding. This study suggests a decision making model by making environmental elements for bidding into numerical values. The proposed model based on Saaty's AHP method intends a bidder to make a precise decision by quantifying his subjective assessment.