Important factor of underground structures utilizing precast and rigid wall is joints and connections of wall-to-wall and wall-to-slab for safety performance and durability of underground constructions. In this study, conducting research on the structural safety of the connection as a future laboratory experiments and connection method for the verification of the details of the construction method is expected to proceed research.

If the bracket triangle are commonly used, you may issues such as withdrawal caused by mounting unstable bracket phenomena and bending wire, the eccentricity of the loading plate than steel when you change the angle of the hole during construction will occur. SM brackets adjustment of the angle of 25~40 degrees is possible adjustment of the angle of the ground anchor bracket arched surface, the change in distance between the fixing position of the line and band pieces, due to changes in the installation angle, designers from steel Unlike with the intention, it is possible if the corresponding method can be constructed. Also, For construction of temporary structure used anchor, it will be reinforced with stiffener to prevent excessive deformation of the wale. In general, the welded steel stiffener is used. Construction of welded steel stiffener is costly and time-consuming and cause the problem that wale does not reuse. In order to solve these problems, various kinds of non-weled stiffeners are being developed.

We had designed and constructed floating type photovoltaic energy generation system, which is improved the structual and economical efficiency, compared with the system developed in the previous research. In this paper, the basic characteristics of wind force coefficient on a PV panel installed on the floating type PV energy generation system are investigated though the two-dimensional wind tunnel tests. Test variables included the angle of PV panel, direction of wind, number of rows of PV panel and attached or not attached frame. Based on the results obtained through the wind tunnel tests, it was found that the wind force coefficient can be used as a preliminary data in the design of the structure.

This study reviewed analytically the behavior of Steel Plate Concrete(SC) walls subjected to shear forces to investigate the effects of shape and arrangement spacing of studs on the design of SC walls. The results showed that the steel plate was yielded at the lower load than the second yielding shear force of the design skeleton curve when the spacing of stud is excessively far from each other. It is also found that the shape of the stud did not affect the shear behavior of SC wall, however, the spacing influenced to its composite action.

In this paper, the case study is investigated for the application of vibration absorbing in railway bridge. This paper suggests considerations of the application of vibration absorbing in railway bridge using the result of the investigation. Finally, this paper suggests the research direction of the application of vibration absorbing in railway bridge.

This paper were studied overseas development practices for develop to silent bridge. This paper suggests considerations of the development of silent bridge using the result of the investigation. Finally, this paper suggests the research direction of the development of silent bridge.

Fatigue crack can be a controlling factor in the life of some welding components, such as vertical and horizontal stiffener. In this study, FE analysis was carried out to examine the three-dimensional fatigue crack penetration of gusset welded joint using the finite element analysis program FEMAP and FRANC3D. Three-dimensional fatigue crack penetration analysis result was compared with two dimensional fatigue crack penetration analysis result. From the FE analysis results, stress intensity factor(SIF) and crack propagation cycles were evaluated.

This paper presents a half precast strain-hardening cementitious composites (SHCC) and reinforced steel truss deck in order to develop SHCC and reinforced concrete composite slabs. The developed half precast decks were evaluated for loading of construction stages and presented excellent flexural performances during construction stages.

This study presents application of behavior monitoring system of a tall building with TLCD (Tuned Liquid Column Damper). The TLCD is installed on a 64-story, 237m building in incheon, and monitoring system consists of an anemometer, accelerometers, water gauges, and internet-based data logging system.

In this study, an adaptive shared control system for adjacent tall building structures subjected to seismic loads has been investigated using multi-objective genetic algorithms. A tuned mass damper (TMD) was shared with an adjacent building structure in this study. Variable damping or stiffness devices were used to make a controllable shared TMD. Control objectives of the adjacent tall buildings connected by a adaptive shared TMD can be conflict. This kind of problem can be solved using multi-objective optimization techniques that provide a suite of Pareto-optimal solutions. A possibility of application of multi-objective genetic algorithms to design of a adaptive shared TMD for vibration control of adjacent tall buildings has been investigated.

This study targets the development of technologies of reclaimed noise blocking engineering to improve endurance which may unify noise-blocking construction against noise and vibration and earthquake-preventive construction during rebuilding. This paper is to find the validity of construction methodology with RC beam additional materials to apply to slab and walls.

In this study, experimental research was carried out to evaluate the structural performance of the reinforced concrete beam hybrid retrofitting with two materials(groove and embedding FRP rod, CFRP sheet) in existing reinforced concrete buildings. Test results showed that the maximum load carrying capacity of retrofitted specimens(NER1, NER1B, NER1L) were increased by 1.11 ~ 1.22 times respectively in comparison with the standard specimen NBS.

Suspension bridge, one of the long span bridge type, is vulnerable to wind load. To analysis effect of wind load, this paper peformed 2D analysis for suspension bridge. Numerical model is consisted suspension bridge cross section and two nonlinear hanger cable. Suspension bridge cross section has mass and torsional resistance. Nonlinear hanger cable stiffness is bigger as displacement larger. This paper compare w/ torsional resistance model and w/o torsional resistance model. Analysis results show that w/o consider cross section torsional resistance is likely to overestimate structure response.

Recently, the demand for the seismic retrofit to existing buildings increased due to earthquake damage. And related researches are increasing in response while the researches considering the various design parameters such as strength and stiffness ratio between the existing structures and retrofit system are insufficient. Therefore, in this study, existing structure and reinforcing frame for damper are designed having different natural periods each other by setting the parameters related to strength and stiffness ratio between two systems and are analyzed by nonlinear dynamic analysis.

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. This system has the advantages of maintenance, economics and satisfying the performance objective for seismic design. So recently, research and technology development of buckling restrained brace system increase. The existing buckling restrained braces have been developed in various sections and connection types with structures while the research considering production and construction availability, lateral constraints of core-end and matching with the construction plan is insufficient. Accordingly in this study, the optimum alternative system of the buckling restrained brace satisfying the above conditions and system application expansion possibility is suggested.

The purpose of this study is to evaluate a RCS strengthening method for medium & low-rise R/C buildings using the nonlinear analyses of member-level. In this study, a three-story R/C buildings that represents a typical Korean school constructed in the 1980s was selected. Seismic capacities of the building before and after CFCC strengthening method are evaluated using the nonlinear static & dynamic analyses of member-level.

Lead-rubber-dampers to install on building exterior for seismic retrofit was proposed and tested. Dependency of the strength and stiffness on the displacement amplitude and frequency was evaluated through cyclic loading tests. The elastic stiffness of the experimental bi-linear model for the proposed damper was influenced by loading frequency, while the peak load of the damper was affected by the displacement amplitude, primarily.

Recently a lot of strong earthquakes are happened in China. By the report of the Earthquakes that can be seen the URM buildings are destroyed by the highest rate. Thus in this study, the performance and vulnerable of URM houseing buildings in China, and use them to describe the derivative and evaluate the seismic performance have been analyzed.

The purpose of this study is to identify the relation between predominant period of earthquake and acceleration characteristics of domestic high-rise buildings. First, we gathered and classified the real earthquake waves through response spectrum method. Second, we performed seismic response analysis and analyzed the result. The conclusion is as follows. In the case of predominant period range from 1.0 to 4.0 which has relatively less probability, the damage can be concentrated on buildings from 20 to 60 story.

Recently, it is more concerned about securing of its seismic safety, as underground structures are significantly recognized. Especially, it is very important that underground structures such as the tunnel of urban railroad or subway ensure the seismic safety of its, because it can be caused an enormous loss of lives and a economical damage by earthquake. When the subway tunnel of cut-and-cover box type is constructed, grounds are excavated and refilled. In this study, the parametric study is performed and analyzed about factors affecting seismic analysis of cut-and-cover tunnel, such as soil type, refilled range, tunnel location, etc. Consequently, it is hoped to provide the preliminary data for a better reasonable review on seismic design and seismic performance assessment of underground structures.