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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 24, Issue 6D - Nov 2004
Volume 24, Issue 6C - Nov 2004
Volume 24, Issue 6B - Nov 2004
Volume 24, Issue 6A - Nov 2004
Volume 24, Issue 5D - Sep 2004
Volume 24, Issue 5C - Sep 2004
Volume 24, Issue 5B - Sep 2004
Volume 24, Issue 5A - Sep 2004
Volume 24, Issue 4D - Jul 2004
Volume 24, Issue 4C - Jul 2004
Volume 24, Issue 4B - Jul 2004
Volume 24, Issue 4A - Jul 2004
Volume 24, Issue 3D - May 2004
Volume 24, Issue 3C - May 2004
Volume 24, Issue 3B - May 2004
Volume 24, Issue 3A - May 2004
Volume 24, Issue 2D - Mar 2004
Volume 24, Issue 2C - Mar 2004
Volume 24, Issue 2B - Mar 2004
Volume 24, Issue 2A - Mar 2004
Volume 24, Issue 1D - Jan 2004
Volume 24, Issue 1C - Jan 2004
Volume 24, Issue 1B - Jan 2004
Volume 24, Issue 1A - Jan 2004
Selecting the target year
The Study on High Tension Bolted Splice by Elasto-Plastic Analysis with Sliding and Experimental Testing
Lee, Chang-Won ; Shin, Jae-Chul ; Bang, Myung-Seok ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 439~444
In this study it is proposed the advanced elasto-plastic analytical method which can identify complex structural behaviors on splice parts of steel structures such as sliding and plastic contact problem between splice plates and bolts considering complicated boundary conditions and various manufacturing defects. Also the experimental tests on splice specimens with artificial inherent defects are conducted to verify numerical results. In the design or repair phase the plastic behavior and ultimate strength of splice mechanism should be very carefully considered to extend the service life of steel structures.
External Post-prestressing Strengthening Considering the Stiffness of Servicing Steel Plate Girder Bridge
Park, Young-Hoon ; Choi, Jun-Hyeok ; Park, Yong-Gul ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 445~453
The research is carried out to suggest the foundation data which can be used in deciding rational prestressing force in strengthening of servicing plate girder bridge. To analyzing the real stiffness of servicing steel plate girder bridge, appling FEM model which is studied with the experimental behavior of undamaged model plate girder brige. From this study, it is analyzed that the servicing bridge has design load bearing capacity and measured compression stress developed by post-prestressing is in accordance with FEM analyzed results which calculated from the FEM model considered undamage condition. In appling external post-prestressing method to the bridge which has more than twenty years servicing period, the time dependent prestress loss is not important factor. With the analytical study, it is founded that the less than 50 percent reduction of slab stiffness has little an effect in strengthening design process.
Dynamic Responses of Advanced Composite Material Bridge Decks Considering Travelling Vehicles Effects
Lee, Sang-Youl ; Ji, Hyo-Seon ; Chang, Suk-Yoon ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 455~462
This study deals with dynamic responses of single and two-span continuous composite bridge decks subjected to moving vehicles using a four-noded Lagrangian finite element that incorporates first order transverse shear deformation and rotary inertia. In this paper, the new finite element formulations for composite decks under the various moving vehicles are developed. The results obtained for advanced composite material decks under the uniformly distributed step loads are in good agreement with the numerical results reported by Kant. Sample numerical studies are carried out for various layup configurations, moving velocities, and boundary conditions. The significant effects of the ply angles on the dynamic behaviors of composite decks under the various moving loading are enunciated in this paper. Several numerical results present better dynamic behaviors of composite decks for [0/90/0/90] fiber angle.
Optimal Selection of the Maintance Method for Existing Bridge Decks Using Artificial Neural Network
Kim, Jong-Gil ; Sohn, Yong-Woo ; Jung, Young-Chae ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 463~471
The purpose of this study is to analysis the original problem of current equipments, and to improve restoration methods. The deterioration process, cause of damage, and the fatigue mechanism of RC slabs were analysed. Also, the condition of RC slab was classified for the applied load. Artificial neural networks are not only efficient calculating methods but also widely used to solve the complex problems at many construction sites. This study examines at existing R.C bridge decks and needs the damage form, the damage cause, and the artificial neural network's form. The 36 database networks were used in this study. This study evaluates a integrity assessment model for external conditions generally the way of 4 steps' ageing. Each method of constructions fixed damage & recovery effect is able to predict and evaluate cost of repair works which is base on repairing and reinforcing method of constructions. Also, it can measure structures about before and after the remainder life.
Analysis of RC Shell Structures Subjected to Cyclic Loadings using Path-dependant Volume Control Method
Song, Ha-Won ; Lee, June-Hee ; Byun, Keun-Joo ; Nam, Sang-Hyeok ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 473~480
To overcome the drawbacks of conventional load control method and displacement control method, the so-called volume control method was developed by utilizing a pressure node added into a finite shell element. The pressure node has an increment of pressure as an additional degree of freedom of the shell element. In this study, a so-called path-dependant volume control method which improves the volume control method for the analysis of path-dependant behaviors of RC shell structures subjected to cyclic loading is proposed. The path-dependant volume control method is a technique which calculates control-volume change of the RC structure depending on the cyclic loading conditions like loading, unloading, and reloading and overcomes the limitation of controlling the volume change of the RC structure according to the loading history. For the finite element failure analysis of RC shell structures, each structure is discretized with multi-layered shell elements and in-plane two dimensional constitutive equations for concrete and reinforcements are implemented for each layer of the shell elements. The results of the analysis for RC slab, RC tank, and RC box culvert subjected to cyclic load using the path- dependant volume control method are verified with experimental results.
Cumulative Damage of Pavement Concrete under Variable-Amplitude Flexural and Split Tensional Fatigue Loading
Kim, Dong-Ho ; Jun, In-Ku ; Yun, Kyong-Ku ; Lee, Bong-Hak ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 481~489
The purpose of this study was to evaluate the cumulative damage of pavement concretes subjected to flexural and split tensional variable amplitude fatigue loading by comparing the results from linear-damage, nonlinear-damage and equivalent cumulative damage theories. The experimental and theoretical results were also compared in terms of remaining lives for both of split and flexural tension tests. The fatigue tests were conducted for the specimens of
split tension cylinder and
flexural beam. The variable amplitude fatigue tests included two and three steps of increasing and decreasing loads; total 6 loading cases. The test results showed that the linear damage theory proposed by Palmgren-Miner was applicable in decreasing cases. The nonlinear damage theory proposed by Oh and equivalent cumulative damage theory, however, showed that the cumulative damages D were close to 1, indicating that the expected lives from theories were similar to those from experiments. The cumulative damage of split tension was larger than that of flexural fatigue test result because of the biaxial stress condition.
Development of Ductile Hybrid FRP Reinforcing Bar and Prediction Model of Tensile Behavior
Won, Jong-Pil ; Park, Chan-Gi ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 491~500
The corrosion of steel rebars has been the major cause of the deterioration in reinforced concrete structures. FRP reinforcing bar (rebar) was developed to solve the problem of such steel rebar. FRP rebar in concrete structures may be used as a substitute of steel rebars for the cases in which aggressive environment produce high steel corrosion, or lightweight is an important factor in design and construction. FRP rebar has only linearly elastic behavior; whereas, steel rebar has linear elastic behavior up to the yield point followed by large plastic deformation and strain hardening. Without plastic deformation, a small increase in load in concrete structures using FRP rebars can cause catastrophic collapse without any warning. Thus, the current FRP rebars are not suitable for concrete reinforcement which a large amount of plastic deformation prior to collapse is required. This study represents the development of ductile hybrid FRP rebar. The desirable mechanical property of ductile hybrid FRP rebar was obtained from the integrated design based on the material hybrid and geometric hybrid concepts. Using these concepts, analytical model was developed to predict the stress-strain curves with different combination of fiber materials and geometric configuration. This model was used to optimize the design of hybrid FRP rebar. Hybrid FRP rebar was tested for tensile strength and the test results compared with the analytical model. The test results showed that the hybrid FRP rebar stress-strain curves are linearly elastic with a definite yield point followed by plastic deformation. Also, analytical model of hybrid FRP rebar can closely predict the behavior of the hybrid FRP rebar.
A Experimental Study on the Reduction of Shrinkage of High Performance Concrete
Koh, Kyung-Taek ; Park, Jung-Jun ; Kim, Sung-Wook ; Lee, Jang-Hwa ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 501~508
Generally, high performance concrete has characteristics such as low water-cementitious material ratio, lots of unit binder powder, thus the heat of hydration, drying cracking and autogenous shrinkage are tend to be increased. This study is to investigated the effect of the expansive additive and shrinkage reducing agent on the drying shrinkage and autogenous shrinkage of high performance concrete as a study to develop the reduction technology of shrinkage of the concrete. Test results showed that the expansive additive and shrinkage reducing agent were effective the reduction of drying shrinkage and autogenous shrinkage of high performance concrete. Especially, the using method in combination with expansive additive and shrinkage reducing agent was more effective than the separately using method of that.
Determination of the Accurate Effective Length Factor for Buckling Design of Plane Frames
Jin, Man-Sik ; Kyung, Yong-Soo ; Kim, Moon-Young ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 509~516
The goal of this paper is to determine the accurate effective length factor (K factor) for buckling design of plane frames and to point out the practical limitations of the alignment chart which provides the approximate effective length factor. At present, the most general method to obtain K factors is to use the alignment chart which is given in the form of nomograph in LRFD-AISC specification commentaries. However it should be realized that various simplifications and assumptions were used in obtaining the alignment chart. Therefore, a simple but effective method to obtain accurate K-factors through the stability analysis of plane frames is developed in this study. To demonstrate the accuracy and effectiveness of the present scheme, K-factors by system buckling analysis of frames are calculated and compared with those calculated by the alignment chart.
Buffeting Analysis of a Cable-Stayed Bridge for Design of Wind Cables
Kim, Ho-Kyung ; Cho, Seo-Kyung ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 517~523
Cable-stayed bridges are very vulnerable to the wind in construction particularly when the superstructures are constructed by the balanced cantilever method. This vibration, the so-called buffeting response due to turbulences, can be mitigated to a certain extent by introducing wind cables. This study investigates possible plans to mitigate the buffeting responses for a very slender cable-stayed bridge, of which the main span length exceeds 500 m with providing only double lanes for traffics. Through the comparative examinations, a plan is recommended between proposed cases of wind cable installation. The required numbers of strands are also calculated for each wind cable. The proposed analytical procedures and it's applications are expected to be utilized for the design of wind cables to secure more stable structures to wind turbulences during construction.
A New Perfobond Shear Connector for Composite Action
Chung, Chul-Hun ; Lee, Heung-Su ; Park, Jong-Myen ; Kim, Young-Ho ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 525~532
This paper summarizes the results of 10 push-out test specimens with a new type of shear connector called perfobond rib. This connector is a flat steel plate with a number of holes punched through. The test specimens were designed to study the effect of a number of parameters on the shear capacity of the connection. The results obtained indicate that the perfobond rib connector is a viable alternative to the headed studs. An appreciable improvement in the shear capacity of the connection was observed when additional reinforcing bars were passed through the perfobond rib holes. The test specimen with 130mm height connector sustained 10% higher ultimate capacity compared to that with 70 mm height connector. Shank shear was the principal mode of failure in specimens with headed studs. In specimens with perfobond rib, failure was triggered by the longitudinal splitting of the concrete slab, followed by crushing of concrete in front of the perfobond rib. For composite beams utilizing reinforced concrete slabs, perfobond shear connectors exhibit adequate ductility and substantially higher capacities.
Effects of Initial Tension on Seismic Response for a Suspension Bridge
Kim, Ho-Kyung ; Lee, Jae-Hong ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 533~539
Since the responses of a suspension bridge can be affected by the tension introduced in main cable and hangers, the sensitivity of responses is examined by varying the tension in cable members. A nonlinear shape-finding procedure is applied in determining the target profile and the introduced tension of the examined bridge. Free vibration and response spectrum analysis are performed using the so-called linearized finite displacement analysis using SAP2000 code utilizing the results of shape-finding analysis. The possible errors in estimating natural periods and seismic responses are demonstrated by introducing intentional errors in cable tension.
Evaluation of Inelastic Seismic Responses of Multi-Degree-of-Freedom Bridge Structures using Capacity Spectrum Method
Song, Jong-Keol ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 541~550
To evaluate inelastic seismic responses of multi-degree-of-freedom (MDOF) bridge structures, the capacity spectrum method (CSM) incorporating the equivalent single-degree-of-freedom (ESDOF) method is presented. Application of the CSM incorporating the ESDOF method is illustrated by example analysis for symmetric and asymmetric bridge structures. To investigate an accuracy of the CSM, the maximum displacements estimated by the CSM are compared to those by inelastic time history analysis for several artificial earthquakes. The results show that the CSM provided conservative estimates of the maximum displacements for the symmetric and asymmetric bridge structures, and the trend of conservative estimates of the asymmetric bridge structures was significantly larger than that of the symmetric bridge structure.
Punching Shear Strength in RC Slabs as Snap-through Model
Hwang, Hoon-Hee ; Lee, Yong-Woo ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 551~555
A theoretical analysis of the punching shear behavior of deck slabs is difficult and complicate so that the experimental approaches have been conducted by considering only a few factors. Snap-through analogy is introduced to establish an arch model which predict punching shear strength of deck slabs in this study. An analogy coefficient between slab and the arch model is a function of dimensionless variables, which are determined by the dimension analysis and is decided by the curve fitting method. The predicted punching shear strengthes are verified by additional twenty experimental results. The results are also compared with the ACI and the CEB-FIP code. The proposed method predicts the punching shear strength of the slabs in the safe side. There is good agreement between the predicted values of the proposed formula and the experimental results.
Distortional Analysis of Multicell Box Girders Using 3-Dimensional Shell Elements -I. Proposal and Application of an Expanded Method-
Park, Nam-Hoi ; Kang, Young-Jong ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 557~563
In this present study, an expanded method for exact distortional behavior of multicell box girders subjected to an eccentric loading is proposed and then is discussed regarding the application of the expanded method. This expanded method is based on the methodology given by Nakai and Yoo that illustrate the distortional behavior of only a sin91e-cell box girder. This expanded method is one that decomposes the eccentric loading into flexural, torsional and distortional forces by using the force equilibrium. From the force decomposition, the combined behavior of multicell box girders also decomposes readily into each separate behavior, which can lead to consideration of only distortional behavior. Consideration of exact distortional behavior of multicell box girders is very important to physically understand distortional phenomenon. Furthermore, it may be also adequately available to the independent distortional analysis using 3-Dimensional shell elements.
Distortional Analysis of Multicell Box Girders Using 3-Dimensional Shell Elements -II. Distortional Analysis Based on the Expanded Method-
Park, Nam-Hoi ; Kang, Young-Jong ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 565~572
In general, the existing 3-dimemsional shell analysis results of multicell box girders subjected to an eccentric loading are expressed in terms of the combined stresses and displacements, which are based on the combined behavior of flexural, torsional and distortional behaviors not on individual behavior. In order to obtain independently distortional results due to the existing shell analysis, therefore, it is necessary to exactly understand the distortional behavior. Exact distortional behavior of multicell box girders, however, has not fully studied up to date. Based on the expanded method proposed in the preceding paper that was illustrated exact distortional behavior of multicell box girders, this paper presents distortional analysis of multicell box girders using the existing shell finite element. Distortional analyses for various multicell box girder bridge models are performed herein in order to promote the designer's understanding regarding the distortional behavior of multicell box girders.
Reinforcement Design of RC Structure using Fiber Reinforced Epoxy Panel
Kang, Sung-Hoo ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 573~583
Fiber Reinforced Epoxy Panel (FREP) is one of the new material which is developed for repair and reinforcement, end it is getting increased its applications. However, it is not organized very well about its mechanical characteristic after reinforcement and also its design method either. The main purposes of this research are introducing the most optimized testing method to evaluate mechanical characteristic and effectiveness of FREP reinforced concrete beam and developing the best design algorithm of FREP reinforcement. The result of this research can be summarized as two main consequences. The main failure of FREP reinforced concrete beam is rip-off failure and P-type testing method can evaluate accurately behavior characteristic and reinforcement effect because this method keeps pre-loading until its failure and it is possible to do realistic simulation about the damage of structure by the cracks and stress of tension steel under the load before reinforcing. Existing FREP reinforced design method did not consider both load before reinforcing and premature failure behavior, and it causes rip-off failure under a less load than the expected value. so it induces excessive reinforcement. Hence, the nonlinear analysis model, which considers load before reinforcing and rip-off failure, is suggested to lead on ductile failure instead of brittle failure. Finally, by including design concept of load before reinforcing, rip-off failure, reinforced length and thickness, best optimized reinforcement design algorithm is developed to maximize the effectiveness of reinforcement.
A Study on Optimum Design for Stiffened Compression Flange in Steel Box Girders
Lee, Sung-Chul ; Yoon, Dong-Yong ; Choi, Hyun ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 585~591
Steel box girders are composed of thin and wide plates. It is, therefore, susceptible to premature failure due to local buckling of plate elements such as flanges and web panels. In order to increase the strengths of thin compression flange, stiffeners are installed in both longitudinal and transverse directions, or thick flanges could be used with a less number of stiffeners. Although, the overall fabrication cost of steel box girders greatly depends upon the design of stiffened compression flange, not much attention has been given to the optimum design of stiffened compression flange. In this study, a computer program was developed for the optimum design of the stiffened compression flanges. ADS (Automated Design Synthesis) program was adopted for the optimum design algorithm. The objective function is the total fabrication cost including material and labor costs. Analysis results reveal that the fabrication cost of the compression flange could be minimized when one or two longitudinal stiffeners are used.
Fatigue Reliability Assessment of Steel Bridge Member with Probabilistic Stress-Life Method
Park, Yeon-Soo ; Han, Suk-Yeol ; Kang, Dae-Hung ; Sub, Byoung-Chal ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 593~602
Reliability of a steel bridge member for fatigue was estimated by the probabilistic stress-life method. When a truck passes over a bridge, the stress history on a member was defined as a block loading and the stress range frequency distribution of stress history was obtained by the stress range frequency analysis. Probabilistic method was applied to obtain the stress range frequency distribution and the parameters of probability distribution for the stress range frequency distribution are used for numerical simulation. To obtain failure probability of a member under the block loading, the Monte Carlo Simulation was performed in conjunction with the Miner Rule, Modified Miner Rule, Haibach Rule for damage evaluation. In this procedure, the fatigue reliability assessment for the member and the remaining fatigue life was proposed and the fatigue reliability analysis for a structure detail of a public steel bridge was performed.
Nonlinear Transient Thermal and Hygral Analyses of Early-Age Concrete Decks in Composite Bridges
Oh, Byung-Hwan ; Choi, Seong-Cheol ; Cha, Soo-Won ; Lee, Pil-Goo ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 603~612
Many concrete decks in composite bridge develop transverse cracking and most of them occur at early-ages. The thermal and shrinkage stress are recognized as the major causes of transverse cracking in the early-age concrete decks. Therefore, it is necessary to predict accurately the temperature and relative humidity arising in the early-age concrete decks of composite bridges in order to control the possibility of crack occurrence. The purpose of present study is, therefore, to assess accurately the variation of temperature and relative humidity in the early-age concrete decks of composite bridges. To this end, the analytical methods which can reasonable predict the changes of temperature and relative humidity are investigated. In order to examine the early-age behavior of composite bridge, several series of test member has been made and the temperatures were measured directly from the test members during early stages. The numerical method which used the measured data about hydration heat and environment conditions, have been verified from the measured temperature of test members. Furthermore, the analysis of relative humidity variations in early-age concrete has been performed using the measured ambient relative humidity. The effect of factors which are related with temperature and humidity of early-age concrete deck of composite bridge, have been quantitatively evaluated from the investigated analytical method. The present study can be adopted as input in the analysis of thermal and shrinkage stress in early-age concrete deck and ultimately used to prevent the large tensile stress in early-age concrete.
Strain and Stress Distribution of Early-Age Restrained Concrete Decks in Composite Bridges
Oh, Byung-Hwan ; Choi, Seong-Cheol ; Cha, Soo-Won ; Lee, Jun-Hyeok ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 613~622
The transverse cracking in concrete deck of composite bridges frequently occurs at early ages. Among various factors, it has been reported that the thermal and shrinkage stresses have a great effect on the transverse cracking in early-age concrete deck. Therefore, it is necessary to predict accurately the stresses caused by the temperature and relative humidity change arising in early-age concrete deck of composite bridge in order to control the possibilities of crack occurrence. The purpose of present study is to assess accurately the stresses and ultimately the risk of transverse cracking in early age concrete deck of composite bridges. To this end, the analytical method which can reasonably predict the stress of early-age concrete deck, has been proposed. Several series of test members which can exhibit the early-age behavior of composite bridges, have been made to measure the actual total strains, stress-independent strains, and stresses in early-age concrete deck. The investigated numerical model has been compared with the measured data. Furthermore, the effects of parameters related with the thermal and shrinkage stresses have been quantitatively evaluated from the investigated analytical model. The analytical method investigated in this study can be used to predict the strains and stresses of early-age concrete deck. Furthermore, the results of parametric study on the stresses in early-age concrete deck can be used to establish the counter measure for crack control of early-age concrete deck in composite bridges.
Design of Internal Diaphragms in Seel Box Girders
Lee, Sung-Chul ; Lee, Doo-Sung ; Choi, Heon ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 623~630
Steel box girders may undergo cross-sectional distortions during construction and service stages. The distorted cross section arises primarily from torsion produced by eccentric loading. The cross-sectional distortion may be accompanied with very severe distortional stresses when traffic loading is applied with high eccentricity. In general, deformation of the cross-section distortion is restrained by internal diaphragms. In the present study, 3-dimensional finite element analysis was carried out in order to find out the required dimensions of the cross-frame type members. The results indicate that even members having much lower stiffness than that required in the design guide can successfully control the distortional stresses. Finally through a parametric study using the finite element analysis results, a simple design rule is suggested to determine the sizes of the cross-frame members.
Reliability Analysis and Sensitivity Analysis of Concrete Structure under Bi-axial Stress States
Lee, Seong-Lo ; Bae, Yong-Gwi ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 631~637
The reliability assessment of reinforced concrete building subjected to earthquake load includes the structural analysis considering random variables such as load, resistance and analysis, the definition of limit states and the reliability analysis. In this study, Drucker-Prager failure criterion is defined as limit state function under bi-axial stress states of concrete. And the reliability analysis is performed easily by response surface method. It is necessary to take sample points carefully because the variable that has the large sensitivity of response surface has an large effect on the results of reliability analysis. The effect on the variability of probabilistic variables which contribute to the reliability of structures can be estimated by considering how the variables shown in the limit state function have impact on it.
An Ultimate Pressure Capacity Assessment of Prestressed Concrete Containment Vessel Considering Non-symmetric Factors
Moon, Il-Hwan ; Sim, Jong-Sung ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 639~646
Under the ultimate internal pressure the nuclear reactor containment vessel represents the non-symmetrical and the non-linear behavior, since the structure has the non-symmetric factors such as buttresses, large penetrations and tendon layout in the dome. These non-symmetric factors may affect the ultimate pressure capability of the prestressed concrete containment vessel. In the present, however, the assessment method is carried out by using the axi-symmetric finite element model neglecting the non-symmetry. In this study, the nuclear reactor containment vessel is idealized as the three-dimensional model including the non-symmetric factors. And the Modified Drucker-Prager constitutive model with non-associated plastic flow is used for the three-dimensional concrete model. Based on the comparison results between the axi-symmetric finite element analysis and the three-dimensional finite element analysis using tests of 1/4-scale prestressed concrete containment vessel, the nonlinear behavior under internal pressure is directly influenced by the non-symmetries of the structure.
A Study on the Evaluation of Concrete Breakout Strength for Cast-In-Place Anchor with Crack
Jang, Jung-Bum ; Suh, Yong-Pyo ; Lee, Jong-Rim ;
Journal of The Korean Society of Civil Engineers, volume 24, issue 3A, 2004, Pages 647~652
Actual model tests are carried out to investigate the influence of the crack to concrete breakout strength of anchorage and to examine the appropriateness of various criteria that are available for the anchorage design in new nuclear power plant and the anchorage capacity evaluation in operating nuclear power plants in case that the various types of cracks are existed in the anchorage. These tests are intended for the cast-in-place anchor that is widely used for the fastening of equipment in Korean nuclear power plants. One hundred five test specimens are manufactured on a basis of ASTM E488 under twenty one cracked conditions and plain concrete. As principal test variables related to crack, the crack width, the crack depth, and the distance between crack and anchor bolt etc. are chosen. In order to apply the tensile force, 100 tonf-capacity actuator is used with displacement control of 0.5 mm/min. It is proved that ACI 349 Code, CCD procedure of CEB-FIP Code, and SQUG GIP are conservative in comparison with test results. Some improved proposals are issued on a basis of test results in order to accurately take account of the influence of the crack in anchorage capacity evaluation.