Between the RC and SC structures, the connection method, such as baseplate type(mechanical splice) & noncontact lap splices, was suggested in KEPIC SNG. In previous research, baseplate type using #14bar were developed and their structural integrity was confirmed by the actual bending test. However, the structural integrity of noncontact lap splices using #14bar has not been yet confirmed through experiment. In this study, load-displacement curve of noncontact lap splices FEM model is compared with baseplate type analytical results. This research suggests the possibility of the noncontact lap splice for connection design in case of #14 dowel bar of RC Structure.

As development of the construction technique, new composite material has been developed and research on structures made of this material is needed recently. In this study, curved composite laminated frame structure with four ply is analyzed using shell elements. There are six angle change cases and maximum vertical displacement with case 2 and 6 which have ±45 degree is smaller than other cases’ displacements.

This study results the shear capacity of a wall depending on the postion and reinforcement of the equipment opening using finite element analysis. Analysis results show that when the openings are placed in the corner, the shear capacity was reduced than in the center. and reinforcing with a steel sleeve can compensate for the reduced strength

This study suggests a PM interaction curve as a management element to prevent collapse of system supports. the FE analysis result show the element buckes when the element is beyond the PM curve. Since the system is able to resist a certain flexural strengths it is determined that the PM curve is suitable for a management element.

In this paper, to protect the piping in nuclear power plants and various plant facilities, we have developed a damper using the friction method and carried out a study to analyze the performance. Friction typed damper means a device for attenuating vibration by generating a frictional force to the bearing and the shaft by applying a compressive force to the MER-Spring. In order to analyze the performance of the damper, the properties of MER-Spring and friction materials were analyzed, a study on the effects of friction was carried out, and the behavior of this equation was established. And, to determine whether deformation of the material and to examine the reliability of the behavior of equation established, prototypes was produced and, through a performance test and finite element analysis of a damper made of specimens, they were analyzed.

Based on the study of the Rule of Mixture for FRP (Fiber Reinforced Polymer), it was found that the tensile strength of FRP rebars (reinforcing bars) with circular cross-sections could be estimated with proper reduction coefficients. In this study, a reduction coefficient for FRP rebars with a diameter of 16 mm was proposed.

This study examined the flexural performance of hybrid steel beam-reinforced concrete beam systems with a relatively simple and ductile connection. Test results showed that the flexural strength of the hybrid beams can be conservatively predicted using the equivalent stress block derived in the ACI 318-14 provisions. The dowel bars arranged within the connection were effective in enhancing the ductility of the hybrid beams.

Impact Severity is important parameter to design concrete barrier in South Korea. However, maximum load and load-time history graph showed different depending on parameters under vehicle impact loading. Therefore, in this study, analysis according was conducted to various impact conditions such as vehicle mass and impact velocity under same impact severity. Obtained results from load-time history graph showed key parameter is velocity compared to vehicle mass.

This study examined the effectiveness of the slip-resistance bars on the shear strength and slip displacement components of squat heavyweight concrete (HWC) shear walls with construction joints at the base interface. For the slip-resistance bars, X-, W-, and Ω-shaped bars were arranged at the base interface. W-shaped bars were more effective than the other bars in reducing the slip displacement at the base interface, in particular at the high inelastic level of the drift ratio of 2.0%.

In this study, to examine the application of strut of high strength concrete, an experimental study and analysis was performed. High strength concrete has high capacity for the strut member, especially 80MPa concrete strut has equal quality to 40MPa concrete strut with FRP.

The light rail transits, in theses days, are planed to be introduced in Korea. However, there are more and more problems regarding the noise and vibration from the trackway. In order to reduced the vibration and noise, various method have been applied. Among those methods, it is that one of the most effective ways is to apply the floating mat underneath the slab track. In this stud, a numerical modeling to calculate the effect of the floating mat is to be used as well as the performance of the floating track.

In the both overlap connection and connection with tapered threaded splices of seismic test results, the good agreement of seismic capacity are shown. Therefore the proposed tapered threaded splices can be applied to the RC structure to replace the overlap connection of rebar.

The current seismic design parameter demands less distortions and preservation of nonstationary characteristics and phase angle in design acceleration time histories. This research presents an improved iterative spectral matching method in the time domain for generating acceleration time series compatible with the target design spectrum with high frequency enrichment. A modified correction function in time domain referred as windowed adjustment functionto modify the selected initial input ground motion is proposed.

There has been a growing interest in the seismic performance of existing structures. Have been enacted most of the evaluation criteria, there is a need for specific seismic performance evaluation methods and standardization of the dam. In the present study, we carried out the seismic performance evaluation of two of the concrete dam with different shape, for explaining the relationship of the dam of the shape and seismic safety.

When attaching the building exterior, builder used welded-building hardware in general. But it caused variety accidents like fires and explosions. Thus in this study, we developed the building hardware that not use welding and can follow the structures horizontal displacement when an earthquake occurs in the load building. And shaking table test was conducted.

This paper describes adhesive performance of between concrete and surface-material with different compressive strength and HPP (High Performance Polymer). To measure adhesive strength between concrete and surface-material flexural specimen(100×100×400 mm) with HPP were made and tested. The test result indicated that HPP was effective on low compressive strength than high compressive strength.

In the laboratory, the floor vibration should be strictly controlled. However, the researchers had appealed inconvenience due to the floor vibration. Thus, in this study, the floor vibration was measured and evaluated by ISO 10137. Based on the measured data, a finite element analysis model was established and the floor vibration was reduced by installation of two columns

This study presents the results of experiments to investigate the effect of polymer type and curing temperature on the mechanical properties of polymer mortar. The flexural strength, compressive strength of RHP mortar at the curing temperature of 20℃, 0℃, and –20℃ at the curing age of 24hr were 93%, 93%, and 91%, respectively, relative to those at the curing age of 168hr. On the other hand, The flexural strength, compressive strength of HDP mortar at the curing temperature of 20℃, 0℃, and –20℃ at the curing age of 72hr were 91%, 81%, and 80%, respectively, relative to those at the curing age of 168hr.

In this paper, seismic performance of RC frames reinforced by chevron braces were evaluated. The purpose of experimental study was to increase the stiffness of RC frames. As a results, if steel bracing was reinforced in RC frames, seismic performance of RC frames would be increased.

The present study was conducted to appraise tow theoretical models for reinforced concrete members strengthened with carbon fiber reinforced polymer(CFRP) sheets. Predicted values using two models by ACI 440.2R-08 were compared with ones obtained from experiment. For this, two flexural specimens were tested: one unstrengthened specimen and the other strengthened with CFRP sheets. Based on the test results, the wow models are reliable by showing good agreement with the test results.