In reality, the mono-pile foundation system of OWT (Offshore Wind Turbine) can be damaged due to uncertainties and variations in both ocean environmental loadings and/or soil resistance around the foundation. In other words, the uncertainty parameters directly influence the safety, the performance and the structural behavior of a structure. In this study, a laterally loaded mono-pile foundation for OWT structure is considered to examine the degree of influence of uncertainties in the pile-soil system of the structure by an accurate and practical reliability assessment approach.

This research aim to investigate the qualitative and quantitative performance of concrete deteriorations using Pulse Square Thermography (PST) technique. An experimental test of ten cases was conducted on a concrete slab specimen under different meteorological conditions. The results showed that the absolute contrast between defective area and sound area decreases with the falling of ambient temperature. Besides, the delamination with identical size but placed at a deeper position indicates lower absolute contrast than the shallow delamination.

이 논문에서는 해안구조물에 대한 실질적이고 효율적인 구조신뢰성평가 기법을 제시하였다. 제안기법은 파랑, 조류 등의 하중관련 변수 그리고 콘크리트의 탄성계수와 압축강도, 지반정수 및 경계조건 등과 같은 저항관련 설계변수의 불확실성을 명확히 고려한 복잡한 해안 구조물의 신뢰성을 평가할 수 있다. 라틴 하이퍼큐브 샘플링(LHS), 몬테카를로 시뮬레이션(MCS) 및 유한요소법을 합리적으로 결합한 제안기 법에서 LHS기반 MCS는 신뢰성평가에 필요한 샘플링 수를 대폭 줄여주므로 계산노력이 획기적으로 감소된다. 검증예제를 통하여 제안기법 이 상대적인 정확도를 보장하며 계산상의 효율성이 우수한 것으로 확인되었다. 또한 실제의 케이슨형식 방파제 구조물을 대상으로 한 수치예 제를 통하여 그 적용성과 효율성을 입증하였다. 특히 유한요소법 또는 유한차분법과 같은 알고리즘 형태의 암시적 한계상태함수를 갖는 경우 와 비선형해석, 복합재료, 다양한 기하형상 등을 복잡한 구조거동을 고려해야 하는 실제적인 구조물의 신뢰성평가에 적합한 것으로 판단된다.

Damage states of an underground tunnel structure need to be defined in the estimation of its seismic fragility. They are identified in this paper by applying pushover analyses of an typical tunnel structure. Latin Hypercube sampling (LHS) technique is used to explicitly consider uncertainties in the associated design variables.

Probabilistic risk of an offshore wind turbine tower-monopile foundation structure is investigated using in this paper. It can consider both soil-structure-fluid coupled effect in the system and a large amount of variability in both ocean environmental load and soil resistance.

This study evaluated the lateral thermal deformation induced by environmental factors for a precast I-girder. Lateral temperature gradients across the cross-section of the girder were calculated using analytical equations based on daily solar radiation, temperature variation, and wind speed. Then the lateral thermal deformation showed an average of approximately 40% to 71% of the tolerance for the initial lateral deformation of the girder, defined in the PCI bridge design standard.

A RSM-based reliability analysis approach is applied to evaluate the safety of floating structures considering uncertainties associated with various design variables. Uncertainties in both load and resistance related variables are explicitly considered in the analysis. It is expected to be practically applied in the reliability-based design of real structures including floating structures.

We have tested the measuring system that can monitor the dynamic behaviour of floating structure by various sensors. In this paper, we present a initial result using a low-cost GPS sensor, which showed the inaccurate position and insufficient frequency for a floating structure.

This paper deals with the response analysis of a floating building structure subject to both wind and wave loads. The hydrodynamic analysis is performed with sets of wind and wave loads selected from the 100-year return period concept to assess the effect of extreme ocean environmental loads on a floating building. From hydrodynamic analysis in time-domain analysis, it is shown that the responses obtained from the analysis in consideration of both wind and wave loads are far greater than those of wave load only.

In this paper a computationally efficient methodology to establish the seismic fragility curve for underground tunnel structures is developed by integrating the response acceleration method and the maximum likelihood approach with a large set of artificial ground motion time-histories. It is elaborated with an illustrative numerical example.

An efficient and practical reliability analysis method is required for the development of reliability-based design (RBD) guidelines of coastal structures. Such a novel method is presented in this paper. It is capable of evaluating reliability of real complicated coastal structures considering uncertainties in various sources of design parameters. It is developed by intelligently integrating the Latin hypercube sampling (LHS) method and the finite element method (FEM). The applicability and efficiency of the proposed method are verified using a caisson-type quay wall. in the numerical example.