• International Journal of Concrete Structures and Materials
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• v.10 no.2
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• pp.125-142
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• 2016

An overall review of the structural behaviors of ultra-high-performance fiber-reinforced concrete (UHPFRC) elements subjected to various loading conditions needs to be conducted to prevent duplicate research and to promote its practical applications. Thus, in this study, the behavior of various UHPFRC structures under different loading conditions, such as flexure, shear, torsion, and high-rate loads (impacts and blasts), were synthetically reviewed. In addition, the bond performance between UHPFRC and reinforcements, which is fundamental information for the structural performance of reinforced concrete structures, was investigated. The most widely used international recommendations for structural design with UHPFRC throughout the world (AFGC-SETRA and JSCE) were specifically introduced in terms of material models and flexural and shear design. Lastly, examples of practical applications of UHPFRC for both architectural and civil structures were examined.

• Korean Institute of Interior Design Journal
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• no.20
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• pp.26-32
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• 1999

The point of this study consists in analysing influences of the postmodern design in the contemporary architecture. Since the modern architecture, new concept of architectural design has been materialized in the Late-Modern and the High-tech style but the revolutionary changes has been tempted by the postmodern architects who introduced the Rhetorical language in the contemporary architecture. In concrete terms postmodern architecture divided architectural elements from existing function (according to U. Eco, it is the primary function of architecture) and gave another function which is the secondary function or the symbolic function or architecture. And the methods of deviation from the conventional code is exactly the rhetorical expression technique which governed the history of art in Europe (but these technique is more intensively applied in the postmodern architecture) So this study is purposed to analyse the different rhetorical "figyres" regarding the syntax and semantic of the architectural langyage, and particularly to approach to the basic mechanism of the New Design Concept in the Contemporary Archiecture.chiecture.

• Architectural research
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• v.10 no.1
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• pp.13-23
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• 2008

It is the purpose of this study to evaluate the structural performance of steel pipe splice for SD500 high-strength reinforcing bar, through a cyclic loading test. The experimental variables adopted in this study include the development length of rebar, the type of sleeve, and size of reinforcing bar, among others. The results of this study showed that the developed steel pipe splice system for SD500 high-strength reinforcing bar, retained the structural performance required in domestic, ACI and AIJ code. It is considered that the study result presented in this paper can be helpful in developing a reasonable design method for a steel pipe splice system for SD500 high-strength reinforcing bar.

• International Journal of Concrete Structures and Materials
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• v.10 no.3
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• pp.355-371
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• 2016

In this study seismic performance of reinforced concrete staggered wall system structures were investigated and their behavior factors such as overstrength factors, ductility factors, and the response modification factors were evaluated from the overstrength and ductility factors. To this end, 5, 9, 15, and 25-story staggered wall system (SWS) structures were designed and were analyzed by nonlinear static and dynamic analyses to obtain their nonlinear force-displacement relationships. The response modification factors were computed based on the overstrength and the ductility capacities obtained from capacity envelopes. The analysis results showed that the 5- and 9-story SWS structures failed due to yielding of columns and walls located in the lower stories, whereas in the 15- and 25-story structures plastic hinges were more widely distributed throughout the stories. The computed response modification factors increased as the number of stories decreased, and the mean value turned out to be larger than the value specified in the design code.

• Computers and Concrete
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• v.19 no.4
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• pp.405-411
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• 2017

Carbon Fiber Reinforced Plastic (CFRP) has commonly been used to strengthen existing RC structures. Wrapping the whole component with CFRP is an effective method and simple to execute. Besides, specific configuration of CFRP sheets (L, X and T shape) has also been considered in some experiments to examine CFRP effects in advance. This study aimed to provide an optimal CFRP configuration to effectively retrofit the beam-column connection using continuous material topology optimization procedure. In addition, Moved and Regularized Heaviside Functions and penalization factors were also considered. Furthermore, a multi-material procedure was also used to compare with the results from the single material procedure.

• Structural Engineering and Mechanics
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• v.33 no.3
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• pp.261-284
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• 2009

The seismic behavior of a framed structure with chevron-type buckling restrained braces was investigated and their behavior factors, such as overstrength, ductility, and response modification factors, were evaluated. Two types of structures, building frame systems and dual systems, with 4, 8, 12, and 16 stories were designed per the IBC 2003, the AISC LRFD and the AISC Seismic Provisions. Nonlinear static pushover analyses using two different loading patterns and incremental dynamic analysis using 20 earthquake records were carried out to compute behavior factors. Time history analyses were also conducted with another 20 earthquakes to obtain dynamic responses. According to the analysis results, the response modification factors turned out to be larger than what is proposed in the provision in low-rise structures, and a little smaller than the code-values in the medium-rise structures. The dual systems, even though designed with smaller seismic load, showed superior static and dynamic performances.

• Journal of the Korean Society of Safety
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• v.23 no.6
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• pp.100-107
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• 2008

Earthquake is one of the hazard so hard because it is difficult predicted occurred time, scale and characters. Due to a recent Sichuan earthquake in China with a magnitude of 7.8, it is worried about having a major earthquake in Korea peninsula in near future. The earthquake in Kobe, Japan showed that the damages were concentrated on the buildings which were not considered to be protected from the earthquakes. In this study, apartment structures in Korea analyze about earthquake hazard and evaluate seismic performance. Through the this study we have notice of earthquake hazard for apartment structures which live a lot of population of Korea and suppose necessary for seismic retrofit.

• Journal of the Architectural Institute of Korea Planning & Design
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• v.35 no.2
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• pp.53-62
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• 2019

'Delirious New York(1978)' of Rem Koolhaas is not only a historical book but a double code text writing the history of Manhattan in parallel to surrealism. Throughout this book, the surrealist terminologies such as unconsciousness, desire, paranoid, automatism, cadavre exquis etc, are widely used to explain the urban phenomena and buildings of Manhattan. Among these methods, in the fifth chapter, Paranoid critical method(PCM) invented by Salvador Deli, is explained in detail and adapted to Corbusier's project and other architects of Manhattan. Koolhaas connect PCM to the conceptual transposition and draft in architectural thinking. This thesis is to analyse the terms and methods of surrealism and how these methods are used to explain the urban phenomenon of Manhattan in 'Delirious New York'.

• Journal of Korean Association for Spatial Structures
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• v.22 no.3
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• pp.65-72
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• 2022

A typical low and medium-sized neighborhood living facility in reinforced concrete building secures a high floor and pursues an efficient module plan(long span). Accordingly, research on the development of new hybrid beams that can innovatively reduce labor costs such as on-site installation and assembly while securing strength and rigidity is ongoing. In order to verify the structural performance of the U-flanged truss composite beam with newly developed shape, Experiments with various variables are required. Based on the results, this study is to evaluate the strength of U-flanged truss hybrid beam through the flexural strength of the Korea Design Code and experimental values. It was evaluated that nominal flexural strength was 110% to 135% higher than the experimental value.

• Journal of Korean Society of Steel Construction
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• v.17 no.1 s.74
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• pp.73-82
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• 2005

The objective of this study is to investigate the maximum strength of stainless steel rectangular hollow section columns and beam-columns by using numerical analysis. Stress-strain relationships are modeled based on coupon tests results, and their influences on the maximum strength of columns and beam-columns are discussed. The analysis results are compared with the formula for the limit state design code of steel structures. It is ascertained that the design code for the stainless steel is needed to use stainless steel for the members of architectural structures.