본 연구에서는 콘크리트포장의 디웰바 전단시험 절차와 실험결과를 이용하여 PC 스프레드시트에서 다웰바의 지지력계수와 전단 스프링 강성계수를 산정하는 절차를 제시하였다. 세 개의 시험체를 통해 AASHTO의 다웰바 전단시험을 수행하여 콘크리트 포장의 불연속면에서의 전단거동을 모사하였다. 예비실험을 통해 발생한 비틀림 변형을 최소화하기 위해 측면 고정대 사용하여 실험하였다. 초기하중에서의 하중의 재하(loading), 제하(unloading), 재재하(reloading)를 반복수행한 결과 탄성적인 거동을 보여준다. 그러나 전체 하중 범위에서는 다웰바의 지지력계수 또는 전단 스프링 강성계수는 슬래브의 상대 처짐 또는 재하하중에 따라 비선형으로 거동함을 보여준다. 본 실험에서 얻어진 다웰의 지지력계수는 550-880GN/m3으로서 Yoder와 Witczak이 제안하는 407GN/m3보다는 1.4-2.2배가 크게 산정되었다. 이는 측면 고정대를 사용함으로서, 실험시 예상되는 비틀림 변형이 기존의 실험에 비해 적었던 것으로 판단된다. 본 실험에서 얻어진 다웰의 지지력계수 또는 전단 스프링 강성계수는 다웰바를 이용한 콘크리트 불연속면의 구조해석 시 참고자료로 활용될 수 있다.

In this study, fatigue cracks in welled joints of gusset plate at the lower flange of the plate girder bridge, field measurements were carried out and their test results were analyzed. Results obtained are summarized as follows. The proposed the reliability of the reinforcement effect by comparing the maximum stress value with the limit of the fatigue detailed category E.

If deposits occur around the dam, it is possible to suspect the erosion of the internal material of the dam. Piping can occur if the dam internal material is eroded, and such piping can be a serious safety hazard for the dam. XRD and XRF were performed on the investigated sediments and dam core materials. XRD and XRF were carried out to confirm the constituent minerals and chemical composition of the samples. This method can be applied to detect the possibility of erosion of the material constituting the dam.

After analyzing the evaluation details of the durability items of the concrete retaining wall for a certain period, the problems were identified. The lack of competency and lack of institutional skills of participating engineers have been analyzed as the main factors, and the improvement of technical and institutional aspects is required.

Load test is performed to obtain the data to evaluate load carrying capacity and check static & dynamic characteristics of a structure by estimating the real behavior of bridge due to loading the load. The subject facility in this paper is a bridge located on the spiilway of dam and traffic is relatively less than most brige. Considering the age and operation rules of a dam, however, load test and structure programming analysis were performed to check current conditions for structure under in-depth inspection and the results of that analysis are shown.

Most of the domestic jetties of jacket structure were designed by SACS with design criteria based on “Design Standards for Harbour and Fishery Port”. In fact, companies of structural maintenance and Inspection fail to conduct proper safety assessment of jetties of jacket structure using SACS due to a manpower shortage. But instead, they are using MIDAS to conduct safety assessment of these jetties as an alternative to using SACS. The purpose of this study is to provide the rational way for MIDAS user to assess jetties of jacket structure using SACS.

The aim of this study is to evaluate performance of wind-resistant for existing bridges. For this purpose, It is examined the necessity of dynamic wind tunnel test for existing bridge by theoretical equations before implementation of the test, and the method of wind-resistant performance evaluation is presented so that wind tunnel test would be determined whether it needs to conduct.