Test-bed site in Honam High Speed Railway is under construction for developing infra system core technology and speed-up test over 400km/h. High Speed Railway Infra System’s development are composed of comprehensive research developments which are comprising infra system such as railraod infrastructure, environmental noise reduction, catenary, train control and etc. For high speed-up, the review of track alignment, structural and running safety are required. In this paper, speed-up patterns of train by TPS and structural safety according to load variation are evaluated.

To evaluate the deformation of space frame dome structure in Daegu Athletic Center, horizontal displacements of all 32 supports and vertical deflections at 8 points are predicted through the elastic analysis. The result of a comparison with the measurement data shows that the analysis well predicts the measured horizontal displacements and vertical deflections

The AEMM uses the ageing factor to consider the effects of the increase of the modulus of elasticity of concrete with time on the deformation and stress distribution of reinforced concrete members. Previous researches proposed appropriate values of the ageing factor when the applied load is constant or the deformation is concstant. In this paper, the validity of ageing factor for the building structures were studied by the comparison with the results of step-by step method

To evaluate underground behavior characteristic according to the ground water level variation, displacement and bending moment using FEM(Plaxis) were analyzed. When the ground water level difference is more than 10m, it were analyzed that effects on underground structures was great

Recently, the manually adjustable solar structures are reguired for the angle variation of solar module to increase the electric power efficiency. Therefore, this study presents the adjustable connections in support structure and estimates the stiffness of the connections for the structural performance evaluation of the manually adjustable solar structure

The road luminaires are indispensable facilities for the safety of pedestrians and vehicles. However, foreign products have been used without any verification. In this study, the road luminaires for structural safety against wind load was evaluated through structural analysis. Results show that adequate safety is improved through strengthening inspection hole and use of circular arm.

In this study, an analytical studies were carried out for the buoyancy preflexion method to improve structural performance of concrete floating structures. The buoyancy preflexion means that the preflexion effects were induced to the floating structure due to the difference in buoyancy between the pontoon modules composing the floating structures. As the results of this study, it was found that the buoyancy preflexion significantly influence on structural performance of floating structures.

In this paper, we analyze the lateral behavior of a jacket substructure for offshore wind turbine embedded in sandy soil, and identify the differences of results by soil modeling methods that are fixed end method, coefficient of subgrade reaction method, coupled matrix method, and p-y, t-z, q-z curve methods.

In this study, we suggest the process that can effectively evaluate safety and serviceability of purlin members of new traditional Korean-style house. It is composed of three parts, that is, input, structurecalculation, and structure-evaluation part. We expect that this suggested process can help structural engineers to secure safety and serviceability of new traditional Korean-style house.

Generally deformation of wooden structures is larger than that of concrete and steel structures. We measured deformation of traditional Korean-style houses periodically and analyzed their deformation patterns. We expect that this study can help to reveal causes of long-term deformation of traditional Korean-style houses.

After analyzing the engineering characteristics of backfill soil, we are trying to figure out whether or not satisfy the compaction criteria. For that purpose, Case of design and construction were investigated. I have also evaluted the effect of backfill materials engineering properties on structures according to degree of compaction.

In this study, based on the field and laboratory experiments results of underground box culverts, a residual service life was numerically estimated via the statistical analysis and Monte Carlo simulation.

In this study, the underground box culvert were selected in nine construction sites and the influencing factors of underground structures on concrete degradation were verified through the field and laboratory experiments.

In 2004, 300km/h speed of high-speed rail was introduced in Korea. In recent years, policies and technologies are being developed with the goal of increased speed higher than 400km/h. HEMU-430X vehicles have been developed during the test, and technology-related infrastructure is under development. In addition, studies are underway for improving the speed of 500km/h or more. In more than 400km/h, track irregularity due to bearing force of track is increasing rapidly. In this study, applicability for the track structure with steel sleeper, to investigate alternatives that can reduce bearing force of track and maintenance costs.

The purpose of this study is to evaluate bond strength between sulfur polymer coating material and old concrete. Two kinds of spray casting methods are selected and compared to its bond strength by conducting bond test and measuring available casting time. As a result, the bond strength and available casting time is considerably depends on spray casting method.

Korea is a peninsula which has a lot of soft ground including coastal areas. This soft ground is consisted of clay or silt and it generally has features of high compressibility. Therefore, in order to build a structure, high compressibility ground is needed carrying out ground improvement using deep cement-mixing method. As a Fig 1, this study is evaluated for the applicability of which are load sharing ratio, stress distribution ratio, pore water pressure and settlement with grid structure form

Nonlinear crack analysis was carried out to estimate crack behavior for caisson structures in various conditions such as wave load, salt attack and temperature change etc. Some kinds of modeling techniques were used to estimate exact solution with MIDAS FEA considering creep and drying shrinkage.

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.

In this study, we investigated the physical properties and thermal behaviors of specimens that applied different mixing ratios of foaming agent to evaluate the possibility of use in the structural elements. We proposed the estimating equation for compressive strength of each mix having different ratio of foaming agent. We also confirmed that the density of cement matrix is decreased as the mixing amount of foaming agent increase up to 0.6% of foaming agent mixing ratio which was observed by SEM. Based on porosity and compressive strength of control mortar without foaming agent, we built the estimating equations of compressive strength for mortars with foaming agent

In this paper, neural network technique(NNT) is applied to estimation of chloride diffusion coefficient, which has been used for strength evaluation and concrete mixing design. Rapid chloride diffusion test is performed for concrete with 3 different w/c ratios (0.37, 0.42, and 0.47) and various mineral admixtures such as GGBFS, FA and SF. Regarding 120 obtained diffusion coefficients, NNT is applied and diffusion coefficients are simulated. Utilizing the technique, chloride behavior in concrete is evaluated through FE model based on Multi-Component Hydration Model and Micro Pore Structure Formation Model. The simulated results are verified with the previous test results which have been exposed to sea water for 6 months.