Hwa-Cheol Song

A Study on Public Announcement System for Property Right of Marine Architectural Building

This study is intended to know what is the legal problems to settlement and public announcement of property right for construction of marine architectural building in Korea. Firstly, the situation and the prospect around marine architectural building are examined Secondly, the legal concepts of marine architectural building and the application of related laws are analyzed. Thirdly, the problems related to public announcement of property right of marine architectural building are suggested. Fourthly, some improvement schemes to solve the legal problems in relation with property right of buildings on the water at sea and ocean are proposed. As the conclusion, the marine architectural building can be divided into fixed-type and floating-type in order to find the proper way to handle the public announcement of property right for that sort of building. The fixed-typecan be registered as real estate according to the Building Law through the amendment of the existing related laws. But for the registration of floating-type building a new law should be made. In the near future, improvements on the legal system related with the settlement of property right of marine architectural building should be made, so that private sectors can join construction and operation of the building. Especially a new law for the floating-type marine architectural building should be made as soon as possible.

Analysis of Semi-Rigid Connections on 3D Floating Structures

*Graduate school of National Korea Maritime University, Pusan 606-791, Korea †Department of Architecture & Ocean Space, National Korea Maritime University, Pusan 606-791, Korea요 약 :플로팅 상부구조물은 일반 건축물과 형태는 같지만 기초가 땅이 아닌 하부 부체에 지지되는 구조물로 파랑하중에 의한 영향을 크게 받으며, 파랑하중에 의한 하부구조물의 변형이 접합부에 영향을 미쳐 상부구조물의 이용자에게 사용성 및 안전성의 문제를 발생시키게 된다. 이에 따라 본 논문에서는 3차원 플로팅 구조물의 상부구조물과 하부구조물을 일체화한 전해석을 통하여 강접합과 반강접 접합에 대해 탄성 해석을 실시하였다. 구조물의 전해석과 하부구조물을 제외한 분리해석을 비교 분석 하였으며 탄성 해석을 통해 파랑하중의 CASE를 나누어 파랑하중의 변화에 따른 구조물의 모멘트 및 변위를 접합부에 따라 분류하고 비교하였다.핵심용어 : 플로팅 구조물, 파랑하중, 반강접 접합, 전해석, 분리해석Abstract : The shape of floating superstructure is the same as other bulidings, but the foundation is based not on land but on a floating body. Unlike inland structures, they are largely influenced by the wave load. Deformation of the floating pontoon due to the wave loads affects the connection, which in turn causes problems related to the habitability and safety to the superstructure users. Accordingly, this study conducted elastic analysis regarding rigid connection and semi-rigid connection by the integration analysis that combined together the superstructure and pontoon of the 3-D floating structure. Moreover, this study investigated the results of the separation analysis excluding pontoon and the integration analysis. In addition, elasticity analysis was used to divide up the wave loads cases, and to classify the moment and displacement of the structure depending on connection following the changes in the wave loads. Key words :floating structure, wave load, semi-rigid connection, integration analysis, separation analysis* 연회원 : miazue@hanmail.net 011)429-1317†교신저자 :종신회원, song@hhu.ac.kr 051)410-4582

Experimental Modal Test on a Scale Model of Floating Structure

*,**, †Department of Architecture and Ocean Space, Korea Maritime University, Busan 606-791, Republic. of KoreaAbstract : Identification of the modal properties of a structural system has received much attention over the years because of its importance in structural model updating, structural health monitoring and structural control. This paper presents experimental modal test results such as natural frequencies and mode shapes of a scale model of floating structure. A modal testing is performed on the structure and modal parameters for the structure are extracted from the measured data. The results are compared to a finite element model and the correlation between the measured and analytical modal parameters is investigated.Key words:modal test, floating structure, natural frequency, mode shape, forced vibration

A Study on Load Estimation of Floating Hotel

In the near future, the marine resort development will increase because people`s requirements of marine leisure are raising. Instead of marine resort development by reclamation which causes environmental disruption, it is expected that marine resort development using floating structures increases. And the requirement of floating hotel that is main facilities of marine resort grows too. It is necessary to investigate the load estimation of floating hotel. The floating hotel has two characteristics, both hotel and ship. Accordingly, this study examines the consideration points for planning the load estimation of floating hotel, and the results of load estimation of ship and hote are investigated.

A Study on Structural Safety and Habitability of Superstructure Built on Floating Structure by Integration Analysis

The expectation of a floating structure for the ocean space utilization is increasing. In the future, when a floating structure will be used as the ocean space utilization, buildings will be constructed on a floating structure and people will be active at the building. The building is called superstructure in this paper. A superstructure is deformed by wave loads unlike the land buildings. For the purpose, it is necessary that the dynamic characteristics of a superstructure due to wave loads are grasped. The superstructure should be safe and comfortable for people. Therefore a superstructure must satisfy the requirements for the structural safety and the habitability in the step of the primary design. In this paper, the response of a superstructure is carried out by integrated analysis. The significant waves for 100 year return period and those for 10 year return period are used for the confirmation and the evaluation of the structural safety and the habitability respectively. The results on the structural safety and the habitability are discussed.© 2006 ASME

Second Order Elastic Analysis of Superstructures on Very Large Floating Structure with Semi-Rigid Connections

If semi-rigid connections are used for superstructures of very large floating structures (VLFS), the number of rigid connections can be reduced and more economical construction will be possible. In this study, considering service load and wave load in VLFS, the applicability of mixed use of rigid and semi-rigid connections have been studied using three types of connections for a four-bay eight-story frame. Three types of connections are used; top and seat-angle connections with double web-angle(TSD), extended end plate connections, steel tubular column with square external-diaphragm connections. ABAQUS(Finite element analysis program) is used for conducting second order elastic analysis.

Simplified Static Analysis of Superstructure on Very Large Floating Structures subjected to Wave Loads

For preliminary structural analysis of superstructures on very large floating structures(VLFS), superstructures are analyzed considering elastic deformations of barge type lower-structures subjected to wave loads. In this case, to consider the effect of wave loads on the superstructure, initial displacements at the support points of superstructures are evaluated as input data for the analysis. However, the evaluation and application of displacement loads are tedious and very time-consuming processes. Therefore, this paper proposes a simplified static analysis method to analyze the structural behaviors of superstructures on very large floating structures subjected to wave loads. In this study, the member forces due to the variation of beam span and the amplitude and period of wave load are analyzed by using an example 4 span -3 story structure and the amplification factors for beam moments are represented by the specific regression equation

Dynamic Response Analysis of Superstructures on Very Large Floating Structures

The importance of utilization of ocean space is increased due to high population and narrow land space. The development of a new technology for future use of ocean space, such as a design technology of Very Large Floating Structures(VLFS) is needed. This paper introduces the rime history analysis of superstructures on very large floating structures and proposes the estimation method of time displacement history considering wave loads. The dynamic responses of superstructure according to variation of period and amplitude are analysed using an example frame structure and the dynamic structural safety of VLFS pilot superstructure is evaluated.