With the recent increased awareness of underground water as a resource and detection of radioactive material called radon in underground, underground waterproofing system is newly regard as not only ensuring stability and durability of the structure but also preserving underground water, safety of employee working underground structure, protecting of facilities and comfortable use. For these reasons, constructing industry have highly demanded feasible underground waterproofing system that responding long-life and high-performance new material and developing waterproof performance evaluation techniques. Therefore, this study attempts to build environmental responding waterproof system with high adhesive sealant material and setting a manual of field application in waterproofing construction technique.

Recently, the increased maintenance cost of underground structures due to leakage problems. Also, social issues are discussed in the sink hole caused by the loss of groundwater. For this reason, Leak diagnosis, waterproof and repair of underground structure is important today. So, the aim of this study was the necessity for water leak diagnosis and repair of underground structures.

Ground anchor method is one of the most popular reinforcing technology for slope in Korea. For the health monitoring of slope which is reinforced by permanent anchor for a long period, monitoring of the tension force of ground anchor is very important. Optical FBG sensors embedded tendon was developed to measure the strain of 7-wire strand by embedding FBG sensor into the center king cable of 7-wire strand. This FBG sensors embedded tendon has been successfully applied to measure the reinforcing force of ground anchor during four seasons through temperature compensation of the FBG sensors embedded tendon.

For monitoring of the coastal and offshore structures, many techniques can be applied. In this paper, three different applications were introduced including surface wave based nondestructive testing for concrete structures, vision-based dynamic motion measurement for floating structures, and long-term monitoring using dynamic responses and static strain measurement data for fixed offshore jacket structures.

This study aimed to simulate the complex behavior of structures and predict test results. For this, the leading nonlinear model ‘Bouc-wen model’ was used, and rubber bearing and MR-damper were investigated. While seismic load was being applied, complex behavior of continuous structures was simulated. To test simulation performances, in addition, a seismic response test of the model structure was conducted using shaking table. Then, each structure’s displacement data were compared to simulation results. This study found that nonlinear model-based simulation results were mostly matched with test results, and they are applicable to the prediction of test results.

The conventional brace system is generally accepted lateral load resisting system for steel structures due to efficient story drift control and economic feasibility by frame materials decrease. But the lateral stiffness of the brace decreases following buckling in this system and buckling causes unstable structures with strength deterioration hysteresis performance. Buckling restrained brace system that performs stable behavior after yielding of core element prevented from buckling by tube element is better than conventional brace system in point of earthquake energy absorbing capacity. In this study, the seismic performance of the multi-story steel frames applied for brace and buckling restrained brace is respectively analyzed, so that, the damage of two systems is quantitatively evaluated by analyzing energy absorption capacity.

The objectives of this research are to compute performance point using capacity spectrum analysis, and to use structural damage states classification and damage state criteria through interstory drift angle presented in HAZUS. Seismic fragility curve is drawn by seismic fragility parameter and predict damage probability about non seismic reinforced concrete buildings according to building shapes.

Estimation of damage probability of buildings under a future earthquake is an essential issue to reduce the seismic damage. In this study, capacity spectrum method is applied to develop seismic fragility curve of low-rise non seismic reinforced concrete building under peak ground acceleration.

The dynamic loads such as wind and wave loads are consistently applied to the offshore structure. These dynamic loads affect to the safety and the durability of offshore structure. Tuned Liquid Damper (TLD) was applied to control the vibration of an offshore structure due to dynamic loads. The target structure is jacket structure with PC House for 5-MW offshore wind turbine.

Through The Japanese case that they prevent earthquake damage by using seismic design, we design a building that before reform seismic design and conduct a seismic design evaluation. For detail evaluation, we use Nonlinear Static Analysis and find performance point that using by Capacity Spectrum Method of procedure B and Displacement Coefficient Method. We compared performance point of Capacity Spectrum Method of procedure B and target displacement of using Displacement Coefficient Method. Consequently we obtain a result that those are similar. Result of understanding each element performance level that base on performance point, some elements are unsatisfactory. Thus, We have come to conclusion that re-evaluate after reinforce structure.

The SPC wall girder is connected to the vertical walls to enhance performance of wall-wall girder connection. The purpose of this study is to investigate the structural characteristics such as strength, Load-displacement relation of wall-wall girder connection under the monotonic load tests. The fracture pattern of the specimens induced positive moment at connection was steel plate separation from concrete in SPC Wall.

In this study, four reinforced concrete beams, replacing recycled coarse aggregate with PVA fiber(BSPG-R series), were constructed and tested under monotonic loading. Experimental programs were carried out to improve and evaluate the structural performance of such test specimens, such as the load-displacement, the failure mode and the maximum load carrying capacity. all the specimens were modeled in 1/2 scale-down size.

The ex-vessel steam explosion may occur when, during a severe reactor accident, the molten core pours into the water in the reactor cavity. These dynamic loads on the cavity wall could potentially lead to the significant failure of the cavity wall. But the phenomenon like this steam explosion includes big uncertainty in estimating the impulsive pressure loading of RCB. In this study, risk based integrity assessment method of the NPP structure subjected to steam explosion load was suggested to capture these uncertainties involved during the structural integrity assessment of the Nuclear power plant.

This study attempted to assess performances of adopted MR-damper to control the complex behavior caused by the interaction of independent continuous structures. For this, MR-damper (30kN) was designed and fabricated, and the MR-damper model was investigated using the Nonlinear Bingham Plastic Damper (NBPD). To assess experimental performances, a control test on the model structure was performed while El-centro 150% of seismic load was being applied. Then, MR-damper was placed between two independent structures to have it control independent displacement and complex behavior between the two structures. This study found that MR-damper is effective in controlling complex behavior of structures.

In this study, based on the Building Register, status and existing structural criteria of small-scale steel-frame building is reviewed. As a result, the accumulated small-scale buildings account for about 85% of cumulative entire building. Furthermore, since 2000, the small-scale steel-frame buildings account for about 55% of the small-scale buildings. In other words, the proportion of small-scale steel-frame buildings has been increased. However, the structural criteria is not only insufficient but also structure for some small-scale steel-frame buildings does not have a reference.

In consideration of the point skyscraper dense regions of the country that landfill or soft ground layer, it can be seen that the disaster prevention measures of high-rise structures due to an earthquake of long-period component is an urgent need. Thus, in this study, through the analysis of seismic waves of long period components generated abroad, and to investigate the characteristics of the earthquake, and analyzed the damage case of high-rise structures associated therewith.

Nonlinear seismic evaluation of RC building usually needs much time and man power, In this study, several computational modules were applied for evaluation of existing RC buildings. To investigate the effect of applied modules on time, seismic performance evaluation of example building was performed and the man power input was compared with conventional process.

In this study, the investigation of the local damage evaluation method for the SC structure subjected to impact load was carried out. The conventional RC formula and SC formula to calculate wall thickness to prevent perforation were studied and compared. Finally, these results were compared with finite element analysis results using LS-Dyna, and the future direction to develop the reasonable local damage evaluation method of the NPP SC structure was suggested.

In this research, a total of seven specimens were tested under reversed cyclic loading, controlled by displacement and three times of reversed loads were given at each displacement. The goal of experiments is to identify the seismic and structural performance of pure dry precast concrete beam-column joints using bolt type connection and/or prestressing methods. Two representative results are examined and compared in this paper.

This paper introduce a calculation method for the length of steel and rebar due to load onto the member in large scale structure using precast composite structure system. As result, cost effectiveness of members in large scale structure is procurable by utilizing steel and rebar economically.