The demand for LNG Carrier and LNG fuel ships are increasing due to global carbon neutrality declaration and ship emissions regulation of IMO, domestic shipyards pay technology fees(about 5~10% of ship price per vessel) to GTT company in France for making LNG cargo hold. Localization of LNG cargo hold is needed to reduce technology fees and engage technological competitiveness, it is important to secure the critical technology like automation process development of insulation system process. Especially, the automation rate of membrane-type insulation system is very low due to interference caused by corrugation and difficulty in securing optimal variable welding condition. In this study, to solve this problem, automatic welding is performed using developed automatic welding equipment on STS304L steel which is used in flat and corner area of membrane-type LNG cargo hold's lap joint. After welding, Cross-sectional observations and Tensile strength tests were conducted to evaluate reliability of equipment and welding condition. As a result of the test, it was confirmed that the strength of the welded zone exceeded that of base material, and secured the optimal welding condition to apply automatic welding.

The purpose of this study is to analyze the trend of domestic and foreign steel plate shear wall (SPSW) systems. The investigated countries were three, such as Korea, Canada, and U.S. The full scale or scale down specimens were preponderantly investigated. The details and performances of all specimens were compared for each other.

This paper presented to study used Abaqus on steel plate bonded reinforcement technology for column to beam connections, and then the result showed that steel plate bonded reinforcement technology has great reinforcement effect for RC column to beam joint. Also the steel plate bonded reinforcement technology was safety and convenient operation.

Steel moment-resisting frames are susceptible to large lateral displacements during severe earthquakes. However, frequent damage to concentrically braced frames in past earthquakes, such as the 1994 Northridge earthquakes, has raised concerns about the ultimate deformation capacity of this class of structure. Also, there is no way to accurately predict the behavior of the brace member in the event of earthquakes. Therefore, the objective of this study is to compare the performance of chevron braced frames when they are used in the upgrade of deficient RC frames.

The purpose of this paper is to check the safety of the scaffold structures used wire rope. The structural safety on the scaffold structures with wire rope and boiler furnace was evaluated. As a results, all assessment structures with wire ropes were checked to be safe.

In this paper, the seismic performance of existing column-tree connections using composite deck plate was experimentally evaluated. As a result, although two specimens were not founded the brittle fracture at the beam-to-column, composite slab were destroyed by crushing at the beam-to-column connection.

In this paper, the effects of beam splice location on seismic performance of column-tree connections were experimentally and analytically evaluated. The study results showed very little difference between the results of analytical and those of experimental.

By reducing the cross-sectional area of the splice plates, the weak-axis column-tree connections which plastic hinge was forced into the splice connection were proposed in this paper. The main objectives of this testing was to investigate the semi-rigid performance of weak-axis column-tree splice connection.

In this paper, the seismic performance of column-tree connections was experimentally evaluated, depending on location of plastic hinge. As a result, although two specimens were qualified for SMFs, beam-to-column connection and flange plate were detected the brittle fracture during 5% story drift ratio.

In this paper, in order to evaluate the seismic performance on semi-rigid column-tree type connections, the experimental results and the finite element analysis results were compared. As a results, both results were considerably similar.