The focus of this study is to investigate the ASR of concrete incorporating pre-treated soda-lime glass as aggregates. The glass aggregates were pre-treated with three different techniques, i.e. Ca(OH)2, NaOH and the mixed solution. The results indicate that all the pre-treatment techniques showed a decrease effect on ASR and such an effect increase with treatment time, the mixed solution showed the best effect. The pre-treated glass aggregate at the mixed solution at 80℃ for 7 days providing a 45% reduction in the expansion caused by ASR, and it can be considered innocuous based on ASTM C1260.

This research provides techniques for the implementation of an integrity evaluation system developed for wind turbine structures to jack-up barge. The strain values obtained from the upper tip of the footing are to be converted into values at a single point in order to represent the structural behavior. These obtained values are evaluated simultaneously through P-M curve, generated by FEM results. Evaluating loads with P-M curve, structural stability of barge could then be monitored.

In this study, Integrity evaluation of offshore wind turbine substructure was carried out. The strain values obtained by strain gauges circularly installed on upper part of the substructure was converted into vertical and moment load. Considering directions of the moment load through FEM, the most conservative P-M interaction diagram of the model was graphed. Obtained load values were evaluated by utilizing P-M interaction diagram.

비정형 판 부재의 탄소성 좌굴 강도를 평가할 수 있는 새로운 지표를 제안하였다. 부재 경계면에 작용하는 하중 또는 경계면의 변화 에 따른 외부일 또는 변형에너지를 부재의 평형 변형경로에 따라 계산하고, 이 에너지의 이차 변분량의 부호가 양에서 음으로 바뀌는 시점을 안 정한계로 제안하였다. 판 부재의 단면력을 등분포 또는 선형으로 근사한 상태로 단면력을 사용하여 좌굴한계를 평가하는 현 기법과는 반대로 단면력의 변화가 비선형적인 복잡한 경우에도 간단히 좌굴한계를 평가할 수 있다. 선형탄성 문제에 대해서는 본 기법의 결과와 전통적인 방법 이 동일한 결과를 도출한다.

A new index for the buckling strength of non-structured plates is proposed. The traditional method of evaluating buckling strength involves inconsistancies of stress distribution while new method of checking the energy variance always provides consistent and even results in any shape of member or load and boundary conditions.

Due to expansion of service environments for the Jack-up barge, the design of the footing has been improved. In this paper, the structure analysis of the modified spudcan based on DNV-OS-C201 examples was assessed.

In this paper, we investigate the pozzolanic reaction of the waste glass sludge incorporating precipitation additives experimentally. The consumption of calcium hydroxide, and the compressive strength were tested for two different types of the waste glass sludge depending on whether precipitation additives were used.

We studied design and structural analysis of jack-up barge footing system that can be safely and quickly installed offshore support structure. In this paper, we checked the buckling strength for a structural member in spudcan based on DNV-RP-C201

In this research, We investigate evaluation on properties of mortars incorporated with waste LCD glass. LCD glass was grinded at 2,500, 3,500, 4,500 cm2/g blaine to replace 20% wt of cement. The compressive strength and Alkali-silica reaction test was carried out to verify effect of finess of LCD glass.