본 논문은 갠트리 크레인의 설계를 위해 컨테이너 하역작업 시 특정하중 조건하의 RTGC(Rubber Tired Gantry Crane)의 동적거동과 그에 따른 윤하중을 분석한 내용을 기술하고 있다. 먼저 RTGC의 동적거동을 살펴보기 위해 거대 구조물인 크레인의 유한요소 모델을 개발하고 고유진동수와 고유모드의 모달시험결과를 이용하여 유한요소모델을 검증하였다. RTGC의 기타 부속품은 3차원 CAD모델링을 통해 다물체 동역학해석 소프트웨어인 ADAMS에서 강체로 모델링하였다. 본 연구에서 하중 조건은 일반적인 컨테이너의 이송조건(OP1)과 외부부하조건 없이 단순히 트롤리를 이용하여 컨테이너를 하역하는 2가지 경우로 고려하였다. 해석 결과 RTGC의 컨테이너 작업 시 발생하는 크레인의 진동은 거대 구조물의 강성과 변형에 주로 기인함을 확인하였으며 이러한 크레인의 진동은 RTGC의 움직임을 발생시켜 컨테이너 하역작업 불능 등의 거동을 발생시킬 수 있음을 분석할 수 있었다.

PURPOSES: The objective of this study is to analyze and evaluate the behavior of orthotropic steel bridge deck pavement using three-dimensional finite element analysis and full-scale wheel load testing. METHODS: Since the layer thickness and material properties used in the bridge deck pavement are different from its condition, it is very difficult to measure and access the behavior of bridge deck pavement in the field. To solve this problem, the full-scale wheel load testing was conducted on the PSMA/Mastic bridge deck pavement and the deflection of bridge deck and horizontal tensile strain on top of pavement were measured under the loading condition. Three-dimensional finite element analysis was conducted to predict the behavior of bridge deck pavement and the predicted deflection and tensile strain values are compared with measured values from the wheel loading testing. RESULTS: Test results showed that the predicted deflections are 10% lower than measured ones and the error between predicted and measured horizontal tensile strain values is less than 2% in the critical location. CONCLUSIONS: The fact indicates that the proposed the analysis is found to be accurate for estimating the behavior of bridge deck pavements.

The purpose of this experimental study is to develop the waterborne silicon acrylic finishing material of parking lots. Resistance-Wheel moving load test was conducted in order to supply basic datum for developing the material by implementing modified polyamide resin. As a result, all the specimens were satisfied by the quality standard regarding dynamic wheel load resistance which is prescribed in KS F 4937. As conclusion, this study confirmed that developed finishing material could be an optimum surface finishing material capable of applying for parking lots’ floors.

In order to complement the defects of a ballasted track requiring continuous maintenance and a concrete track where the initial construction cost is expensive, research on an asphalt concrete track that is easy to maintain, economical and environmentally friendly is underway. In order to investigate the safety and the applicability of the asphalt concrete track, the test construction was carried out on the Kyeongbuk line. In this study, when the Mugunghwa train runs on the asphalt concrete track, the wheel load and lateral wheel load measured through the sensors installed at the rails were analyzed. As a result of the analysis, it was confirmed that the track performance test standard was satisfied.

본 연구에서는 강상자형 사교의 윤하중분배계수에 관련된 외국 설계규준들(AASHTO, AASHTO LRFD)의 문제점을 파악하고, 윤하중분배계수에 영향을 미치는 주요변수에 대한 평가를 수행하였다. 또한 다양한 강상자형 사교의 모델에 대한 유한요소해석을 수행하였으며, 그 결과를 바탕으로 회귀분석을 이용하여 강상자형사교의 윤하중분배계수를 산정하는 식을 제안하였다. 본 연구 제안식의 적용 시 기존 설계규준식의 문제점을 보완할 수 있고, 강상자형사교의 설계시 구조해석에 소요되는 시간을 절약할 수 있어, 그 타당성 및 실용성을 확인할 수 있었다.