In this study, the strategies to achieve more efficient management for the sea-crossing bridges were prepared considering their current maintenance status and special structural characteristics. Various ideas were suggested based on the professional experiences and several knowhow accumulated in the field of the bridge maintenance. Also, such ideas were systematically classified and defined with several sub-topics through the techniques used in the value engineering. In order to improve the management efficiency, the detailed plans considering the sub-topics were established

The energy consumption by buildings approximately reaches 25% of total korea energy consumption. The greatest part in the buildings of the energy consumption is building facade. but a few research projects on concrete comprising more than 70% of outsider of buildings has been tried. This research structural insulation concrete what improved insulation performance using insulation performance improve material

The schedule speed is one of the most important elements of railway industry. In korea, Gyeongbu Line’s highest speed is 300km/h. But it’s schedule-speed is no more than about 174km/h from Seoul to Busan. In this study, we analyzed the effect of the proposed improvements in the speed reduction zone using Train Performance Simulation. We found that the improvements can raise the schedule speed from 15 to 20%.

The purpose of this study was to evaluate the seismic performance of high-performance steel. For this study, the hysteretic behavior and deformation shape of steel beam-to-column connections with SM570TMC was investigated using non-linear finite element analysis. The non-linear finite element analysis was carried out using ANSYS. The displacement analysis of steel beam-to-column connections was conducted according to the qualifying procedures of current korean building code(KBC2009).

A new system to ensure fire resistance of high strength concrete column in high-rise building with an permanent formwork made of insulation materials has been being studied. In this study, the fire resistance performance of the permanent formwork to the mixture of materials was estimated

This study was performed an evaluation of physical & mechanical properties of mortar by Non-Sintered binder of ball milling time according to fineness.

In this study, KS F 2405 was used to investigated the compressive strength of property of high performance concrete (HPC) using the fly ash and silica fume. The experiments were carried out silica fume-binder ratio from 5% (SF5) and fly ash 25%+silica fume 5% (FA25SF5). The compressive strength of HPC determined on 7days and 28days.

Recent advancement of domestic industries and imports and exports due to increased economic power with the rise, demands the construction of the harbor structures, and a variety of structures have been constructed of reinforced concrete. Most of these harbor facilities located in the uppe rpart of the repair and reinforcement does not work smoothly. In this paper, FRP Composite Panel shows the effect applied to the harbor facilities.

Recently, retrofits by using fiber reinforced polymer (FRP) have been widely performed for strengthening of reinforced concrete structure. However, in spite of the weakness of FRP for fire, the research result of it is not enough for practical use. In korea, fire is most frequent disaster which occurs in building. This means the improved structural capacity of building by a retrofit with FRP may be lost by fire if the FRP was not properly protected from it. This paper present a fire test of concrete block reinforced by FRP. From the test, it was found that the bond capacity of FRP attached to concrete decreased from temperature loading of 65℃.

The purpose of the paper is to evaluate the serviceability of two-way hollow core slab with the distinguishingly donut shaped hollow named as GB-SLABTM(Green Ball based lightweight biaxial concrete SLAB) developed by Samsung and patented internationally. One of engineering issues in the long-span concrete slab structure is definitely how to evaluate the long-term deflection considering the cracked section. To evaluate the long-term deflection of GB-SLAB, the immediate deflection after concrete form removal is measured and then the long-term cracked deflection is predicted using finite element analysis

Recently, an interest in volcanic eruption of the Mt. Baekdu is increasing. If the Mt. Baekdu has volcanic eruption, volcanic ash and earthquake will occur. These can give moderate or severe damages to the structure. But the studies of volcanic earthquake and structural damage by volcanic earthquake is not enough. In this paper, structural damages by volcanic earthquake were investigated and analyzed in connection with VEI-Magnitude and Distance-Magnitude relationships.

In this paper, the utilization of PZT’s dual piezoelectric effects (i.e., dynamic strain and electro-mechanical (E/M) impedance responses) for damage detection in beam-type structures are presented. In order to achieve the objective, the following approaches are implemented. First, global vibration-based and local impedance-based methods to detect the location of damage are presented. Then, the vibration-based and impedance-based damage detection methods using the dual piezoelectric responses are evaluated from experiments on a lab-scaled beam.