Byong Jeong Choi

A Study on Bacteria Adsorption Technology for Development of Bacteria Based Concrete Coating Materials

This Study focused on developing the foundational technologies for coating concrete structures with bacteria. In order to utilize the self-purifying capability of bacteria and improve the durability of the concrete, this Study selects the bacteria to form slime films with and proposers the technology to adsorb such coating. Based on the assessment of the slime formation and growth rate of rhodobater capsulatus on different media, maltose was found to be the optimum medium condition. Then, different adsorption materials were used to fix the rhodobater capsulatus cultivated on the proposed medium, and their adsorption characteristics were assessed through image analysis. The high-porous resin is recommended for rhodobater capsulatus adsorption.

Seismic Object Performance Evaluation of Braced Steel Moment Resisting Frames with Low Rise Building under Different Site Stiffness

This study is the compared seismic performance that are difference between the performance of structures on various site classes and beam-column connection. this analysis model was designed the previous earthquake load. To compare the performance levels of the structure was subjected to nonlinear static and nonlinear dynamic analysis. Nonlinear analysis was used to The Perform 3D program. Nonlinear static analysis was compared with the performance point and Nonlinear dynamic analysis was compared the drift ratio(%). Analysis results, the soft site class of the displacement was more increase than rock site classes of the displacement. Also The smaller the displacement was increased beam-column connection stiffness.

Cyclic Test of welding connections for Steel-Plate Concrete Column to H-shaped Steel Girders

This study presents an experimental study of the structural behavior for steel plate-concrete column-to-steel girder connections. Experiments were carried out to investigate the moment-rotation characteristics, failure behavior and ultimate moment capacity of these connections. The results of this experimental study involving three welded moment-resisting connections subjected to cyclic loading are presented. The specimens were fabricated at full scale to evaluate their hysteretic behavior. A description of the test specimens, the details of the joint, the test system and the testing methods are described. The test results showed that the structural behavior of these composite connections was influenced by the connection details.