The maintenance costs will be increased due to the aging of the bridge. Thus, the maintenance strategy considering the damage characteristic of elements is needed for the efficient maintenance of the bridge. The objective of this research is to investigate the minimizing strategy of maintenance costs for highway bridges.

This study carried out an investigation about damage characteristic of substructure such as pier and abutment of highway bridge. The applied methodology was the average damage analysis according to service life. By using above methodology, damage characteristic of substructure penetrated water included de-icing salt was investigated. It was found that the area where was under heavy snow exhibited higher amount of average damage than that of the area where was under much less snow.

Maintenance costs, depending on the occurrence of deterioration expressway bridges has been increasing at a very rapid rate (approximately 200% increase in the last five years). In order to reduce the damage caused by water leakage and de-icing salt damage, We proposed a design improvement of concrete slab edge.

An expansion joint is one of the most vulnerable element in bridge system. Leaks in expansion joints are the major cause of deterioration of the concrete member. The idea of jointless bridges is adopted to resolve these problems. In this study, construction techniques to convert a conventional bridge to a jointless one are surveyed and a tentative solution will be presented.

This paper is presented in progressive improvement of the construction and maintenance for corrugated steel plate culverts in Korea expressway. After reviewing the technical consulting reports and field surveying this whole structures. It is effectively help to minimize damage and improve the stability of structures.

Frequent damages and safety incidences had occurred. Although Korea Expressway Coporation is well organized for various disaster and incidences on expressway based on its many experiences, it still have difficulties in demonstrating its superiority and capability in disaster management. Also when compared with disaster management framework of other organization in developed countries, level of the management still need the improvement.

It is largely divided into two kinds in freezing phenomenon of the tunnel. Waterproof membrane damage inside the tunnel construction joints leaked into groundwater leak occurs in the icicle and despite the absence of damage to the waterproofing membrane, waterproofing membrane from the back of the ground water is frozen freeze by interfering with smooth

Waterside structures such as dams or levees are essential for flood protection, and flood induced failures of such structures can cause serious damages. Real-time safety prediction can prevent most of the damages to inland or the consequential economic damages induced by flood hazards. This study introduces a method of real-time safety prediction by evaluating the correlation between numerical simulation, real-time measurement, and geo-centrifuge data.

This study presented the seismic performance of weir structures with infinite foundations subjected to seismic ground motions, rather than finite soil foundation to avoid the reflection of seismic wave propagation at the mesh boundaries. The analytical model of weir structures was developed in ABAQUS　platform and then the seismic performance of concrete weir structure was evaluated through design response spectrum (KBC 2009). It was revealed that the maximum stresses obtained from infinite models was significantly increased, in comparison to the finite models.

A new array was suggested for effective leakage detection of concrete water facility. This array was modified to serve the purpose. Plus and minus currents have been installed respectively on the upstream and downstream water in order to detect the flow of water floating through the crack of facility. Potential poles in two lines have been installed closer than current sources to the weir to measure potential difference in upstream and downstream. Interpreting the potential difference data acquired by the new array, we could predict that where is the leakage zone. The possibility that can distinguish the leakage zone has been confirmed by numerical and physical modeling and problem position expected to leak was verified in field exploration.

Geo-structures such as levee and cut slope contain uncertainty in soil properties. Therefore, a probabilistic analysis considering the uncertainty of soil properties is required. In this study, probabilistic safety assessment of levee and cut slope has been performed.

This study employed a Bayesian Markov Chain Monte Carlo based HEC-1 rainfall-runoff model to generate the plausible flood scenarios. The proposed modeling scheme showed a promising result in terms of estimating a set of model parameters and deriving their uncertainties. In this regard, the proposed model can be applied to various hydrologic applications such as frequency curve derivation, and hydraulic structures risk analysis.

An integrated hydrodynamic model was developed by dynamic coupling based on numerical grid applied global discretization scheme for 1D channel and 2D overland domain. Interface implementation was suggested to simulate hydrodynamic interaction considering the continuity of time dependent water level/flux between channel and overland regime. A hypothetical watershed example was used to demonstrate the applicability of a coupled 1D/2D model. The results verified that the model reproduced well return flows to channel as well as the diffusion of inundation flow.

Among the various disasters caused by climate change, flooding has account for more than 70% for domestic disaster. This study develops an integrated system that be able to express and spread the disaster information, which can corresponds to the flooding. DRiMSS developed in this study consists of four modules, including RASS, LeVAS, FROK, and FRIENDs. DRiMSS is applied to Sungseo industrial complex in Daegu, and it is confirmed that DRiMSS can produce, express, and spread various disaster information according to the progress of the flooding.

In this study, in order to determine whether this flood inundated by any route when the levee was destroyed, which can simulate the path of the flood inundation model was developed for the SIMOD(Simplified Inundation MODel). Multi direction method((MDM) for differential distributing the adjacent cells by using the slope and Flat-water assumption(FWA)-If more than one level higher in the cell adjacent to the cell level is the lowest altitude that increases the water level is equal to the adjacent cells- were applied. SIMOD model can significantly reduce simulation time because they use a simple input data of topography (DEM) and inflow flood. Therefore, predicting results within minutes will be possible, if you can only identify inflow flood through the runoff model or levee collapse model. Therefore, it could be used to establish an evacuation plan due to flooding, such as EAP (Emergency Action Plan).

Dissipating a risk information from heavy rainfall disaster frequently undergoes synchronous problem during pushing message. This work investigates a method based on RESTful API for guaranteeing the reception of messages from the synchronous problem.

To minimize damage from disasters, various aspects of prevention, preparation, and response, etc. are being managed. A system that can share the identical disaster information based on prompt disaster management and prediction must be developed and constructed for integrated disaster management.

In countries that suffer from heavy rain such as Korea, bridges have to be prepared for a sudden water level increase. However, research on the flood risk assessment for bridges has gained less attention than earthquakes, even though one of the major causes of bridge failures has been reported to be flood. In addition, various sources of uncertainty make it challenging to evaluate the flood fragility of a bridge, and there have been few studies on the flood fragility curve derivation for bridges. The present study proposes a new methodology employing finite element reliability analysis to derive flood fragility curve. In the proposed method, two software packages, ABAQUS and FERUM, are connected so that reliability analysis can be performed in conjunction with sophisticated finite element analysis flood fragility assessment. The method is applied a real bridge in Korea, and flood fragility curves are derived for multiple damage states.

In this study, the intensity change of a crack and concrete surface as light condition was estimated by using a reflection model. The result shaw that the concrete surface intensity was proportional to the light incident degree and the crack intensity was affected by the geometry of the crack.

Civil engineering structures are damaged due to secondary damages from floods. The purpose of this study is a comparative study of past recovery cases and disaster recovery scenarios developed. Disaster recovery scenarios developed with respect to the 6 structures for rapid recovery. The development scenarios were compared with past recovery cases. The results were consistent 70%.