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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
Architectural Institute of Korea
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Volume & Issues
Volume 6, Issue 2 - Dec 2004
Volume 6, Issue 1 - Jun 2004
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Provision of Affordable Housing for Urban Seniors in a New Local Era
Lee, Hyun-Jeong ;
Architectural research, volume 6, issue 2, 2004, Pages 1~9
Affordable housing has been a critical issue in urban affairs since global economy restructured localities. Non-profit or not-for-profit groups emerging in a new local era have been heavily involved in the production of affordable housing. Known as a common form of affordable housing, cooperative housing, especially limited-equity co-op housing (LECH), is community-oriented, neighborhood-based, and demand-side housing initiated at grass roots level. Little research on co-op housing for senior citizens has been made. This study is qualitative research that was designed to examine the mechanism of LECH for senior citizens in urban areas, and to develop the tenets of the LECH living perceived by the residents. A series of qualitative research techniques such as site visits, in-depth interviewing and focus group discussions were employed in four LECH, and semi-structured interview questionnaire was used to meet the research goals of the study. The results of this field research indicated that LECH ensured both short- and long-term affordability and enabled seniors to independently live. Four pairs of tenets were developed in relation to the architecture of LECH living for urban seniors: 1) homeownership and affordability: 2) participation and a sense of community: 3) control over residential environment and democratic governance; and 4) residential satisfaction and environmental support for independent living.
Best Practices for using IT Standards for Integration in the AEC Industry: Product Modeling Approach
Seo, Jong-Cheol ; Kim, In-Han ;
Architectural research, volume 6, issue 2, 2004, Pages 11~20
For the past ten years, many sectors of the AEC industry have been developing standards for the electronic sharing and exchange of product model data. Several related industries such as automotive and shipbuilding manufacturing have been relatively successful in the use of integrating electronic product models into their operations. The AEC industry is lagging in this development. For the AEC industry to meet the challenges of the future, the development of a product modeling standard that enables project information’'s sharing, storing, and exchange is essential. In this research, therefore, authors have highlighted the standards for integration, and reviewed case studies on the standards for integration by literatures investigation and multiple research strategies. Based on these research strategies, consequently, authors propose best practices for using product modeling technologies, called by standards for integration in the AEC industry.
Synthesizing Modeling Features of Entity-Based Integrated Model for Structural Design
Lee, Chang-Ho ; Hong, Nam-Hee K. ;
Architectural research, volume 6, issue 2, 2004, Pages 21~32
This paper synthesizes the modeling features of an entity-based integrated model for structural design, by combining and reformulating each part of the modeling features described in the authors’' earlier papers. An entity-based integrated model uses entities to describe both the design information (product entities) and the design activities (process entities). Organizational, interaction, and sequence relationships exist among these entities. Organizational relationships provide a logical arrangement of product and process entities, interaction relationships characterize interdependencies among the design information described by the product entities, and sequence relationships describe sequences of the design activities described by the process entities. This paper describes concepts and related notation for the organizational, interaction, and sequence relationships, and illustrates them using a structural frame design example. The example shows that the entitybased model has the following beneficial features: design information and design activities are both represented using the same notation based on entities, attributes, and relationships; different types of frame design alternatives are represented uniformly and consistently; interactions among beams and columns are formulated as constraints and are represented as attributes of the related product entities; and a variety of acceptable sequences of design activities are represented as context-free grammars. The contributions of the entity-based integrated design model for developing computer-integrated design systems are critically reviewed.
Shear Strength Prediction for Reinforced Concrete Coupling Beams using Deformation Based Strut-and-Tie Models
Jang, Sang-Ki ; Hong, Sung-Gul ;
Architectural research, volume 6, issue 2, 2004, Pages 33~40
In this study, the strut-and-tie model for the coupling beam with plastic hinges is presented. The ultimate rotation of the coupling beams is obtained by using the geometric relationship between walls and coupling beams at ultimate state. Assuming the required plastic deformation at both ends of the coupling beam, the strut-and-tie model is constructed. To design earthquake-resistant shear-dominated RC coupling beams, it is important to consider shear strength deterioration with required ductility. This research proposes the method of estimating shear strength of the reinforced concrete coupling beams considering the strength degradation of the diagonally compressed concrete due to the strain in plastic hinges. The proposed method determines the plastic strain from required plastic deformations based on the elastic deformation of coupling beams and ultimate wall deformations. The estimated horizontal strain of beam is then used in calculating the strength of the diagonal strut of arch action with compatibility conditions. The deterioration of shear strength of the coupling beam depends on the decrease of arch action due to plastic deformations.
A Study on the Alkali-aggregate Reaction in High-strength Concrete with Particular Respect to the Blast-furnace Slag Effect
Kwon, Young-Jin ;
Architectural research, volume 6, issue 2, 2004, Pages 41~48
The alkali-aggregate reaction and blast-furnace slag effect in high-strength concrete were studied in this paper. From the results of this study, it is possible to draw the following conclusions : (1) In high-strength concrete, because of high alkali content, the possibility of alkali-aggregate reaction is much higher than conventional concrete. (2) The occurrence of large expansion can be prevented by using non-reactive aggregate, which has been judged according to the mortar bar and chemical method as specified in JIS A 5308, in high-strength concrete. (3) The replacement of cement by 30% of blast-furnace slag and the utilization of low alkali cement can prevent (4) the alkali-aggregate reaction from causing large expansion in high-strength concrete.