• 한국강구조학회 논문집
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• 제14권1호
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• pp.59-67
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• 2002

2층, 1경간 그리고 횡지지되지 않은 3차원 강뼈대 구조물의 극한강도 실험을 수행하였다. 과거의 강뼈대 구조물 실험은 2차원 구조물들의 실험이 대부분이었으므로 이 분야의 지식을 확대하기 위하여 3차원 실험에 대한 연구가 필요하다. 실험체에 수직과 수평 비비례하중을 재하하여 하중-변위곡선을 얻었다. 실험결과들은 3차원 비선형 해석의 검증을 위하여 유용하게 사용될 수 있다. ABAQUS를 이용한 3차원 비선형해석으로 얻은 결과를 실험 데이타와 비교하였다.

• Steel and Composite Structures
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• 제24권3호
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• pp.383-391
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• 2017

The goal of this study is to investigate structural analysis and behaviors of an innovative aerial work platform truss frame whose ductility is improved by using high strength-steel UL-700. The present space truss frame can move or stop through tunnels for maintenance constructions by automatic facilities and workmanship within standardized limited building lines of tunnel. Most of all, this method overcomes problematic, which is to block cars during construction periods, seriously, of typical methods like as using truck and scaffolds for tunnel maintenance. According to evaluated appropriate design results of space truss frames of numerical examples by using a commercial MIDAS GEN program, it is verified that design parameters such as layered size, cross-sectional size, and steel material of the present space truss frame are determined to depend on characteristics such as lanes or shape of road tunnels.

• Steel and Composite Structures
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• 제24권4호
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• pp.513-521
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• 2017

The goal of this study is to investigate structural analysis and behaviors of an innovative aerial work platform truss frame whose ductility is improved by using high strength-steel UL-700. The present space truss frame can move or stop through tunnels for maintenance constructions by automatic facilities and workmanship within standardized limited building lines of tunnel. Most of all, this method overcomes problematic, which is to block cars during construction periods, seriously, of typical methods like as using truck and scaffolds for tunnel maintenance. According to evaluated appropriate design results of space truss frames of numerical examples by using a commercial MIDAS GEN program, it is verified that design parameters such as layered size, cross-sectional size, and steel material of the present space truss frame are determined to depend on characteristics such as lanes or shape of road tunnels.

• Structural Engineering and Mechanics
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• 제70권2호
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• pp.221-231
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• 2019

This paper performs for the first time a simultaneous optimization for members sections along with semi-rigid beam-to-column connections for space steel frames with fixed, semi-rigid, and hinged bases using a biogeography-based optimization algorithm (BBO) and a genetic algorithm (GA). Furthermore, a member's sections optimization for a fully fixed space frame is carried out. A real and accurate simulation of semi-rigid connection behavior is considered in this study, where the semi-rigid base connections are simulated using Kanvinde and Grilli (2012) nonlinear model, which considers deformations in different base connection components under the applied loads, while beam-to-column connections are modeled using the familiar Frye and Morris (1975) nonlinear polynomial model. Moreover, the $P-{\Delta}$ effect and geometric nonlinearity are considered. AISC-LRFD (2016) specification constraints of the stress and displacement are considered as well as section size fitting constraints. The optimization is applied to two benchmark space frame examples to inspect the effect of semi-rigidity on frame weight and drift using BBO and GA algorithms.

• 한국실내디자인학회논문집
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• 제6호
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• pp.53-62
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• 1995

This research aims at proving the fact that the forms, spaces and many other design concepts of Modernism are much related with the changes of materials, struc-tures, and the way of construction as well as the idealis-tic and aesthestic things through the history of steel, one of the most important materials of the style. The meaning steel has in the modern architecture can be studied in the structure and industrial production system. 1) Steel frame broadened the range of understanding the space and created the new form through the skeleton/skin structure by reinterpreting the existing space fac-tors while it was being adopted to the architecture. Walls could be freed from the traditional function of bear-ing wall and roofs gave the transparancy to the interior by being linked with the glass. Posts lost the function which confines the space in the frame of the grid system and gave the flexibility to the interior due to the economical materials. These changes made the movable partition, screen with various materials and the system furniture which divides the space more important. 2) In the aspect of the industrialized architecture, it be-came the moment that the most of the archtectural com-posing parts were in mass production as they were standarized, high qualified, and generalized by the indus-trial characteristics of steel, and the specialization of structure and cladding, but the neither of the efforts to make the building itself by mass production or to standarize it was fulfilled. The high-tech architecture which borrows its archtectural manifestation from the high technology, however, is consistently paying efforts on such industrialization.

• Steel and Composite Structures
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• 제8권1호
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• pp.53-83
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• 2008

A rational and efficient seismic design methodology for irregular space steel frames using advanced methods of analysis in the framework of Eurocodes 8 and 3 is presented. This design methodology employs an advanced static or dynamic finite element method of analysis that takes into account geometrical and material non-linearities and member and frame imperfections. The inelastic static analysis (pushover) is employed with multimodal load along the height of the building combining the first few modes. The inelastic dynamic method in the time domain is employed with accelerograms taken from real earthquakes scaled so as to be compatible with the elastic design spectrum of Eurocode 8. The design procedure starts with assumed member sections, continues with the checking of the damage and ultimate limit states requirements, the serviceability requirements and ends with the adjustment of member sizes. Thus it can sufficiently capture the limit states of displacements, rotations, strength, stability and damage of the structure and its individual members so that separate member capacity checks through the interaction equations of Eurocode 3 or the usage of the conservative and crude q-factor suggested in Eurocode 8 are not required. Two numerical examples dealing with the seismic design of irregular space steel moment resisting frames are presented to illustrate the proposed method and demonstrate its advantages. The first considers a seven storey geometrically regular frame with in-plan eccentricities, while the second a six storey frame with a setback.

• 한국강구조학회 논문집
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• 제28권6호
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• pp.395-402
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• 2016

형태(from), 층(layer), 격자(grid) 등의 요소들이 고려되는 스페이스프레임 구조는 내부기둥 없이 대공간 연출이 가능하고, 대다수의 부재들이 210MPa에서 450MPa의 항복강도를 가진 강재들이 사용된다. 최근 국내에서 용접성과 내진성 및 경제성이 확보하고 제작 효율이 높은 항복강도 690MPa이상의 고강도 강재가 개발되고 있다. 본 연구는 스페이스 프레임 구조시스템에 위와 같은 장점을 가진 고강도 강재를 적용하여 구조물의 동적응답을 알아보기 위한 내용이며, 재료 및 기하학적 비선형성에 의한 스페이스 프레임의 구조적 성능을 해석적으로 규명하고자 한다. 이를 위해 각 형태에 따른 스페이스 프레임 구조물의 모드해석 및 비선형 과도해석 등의 유한요소 해석을 수행하였다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2003년도 학술대회지
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• pp.630-633
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• 2003

국내 건설 산업에 있어 공항시설, 체육시설, 집회시설, 판매시설 등에 대한 수요가 증가하면서 무주대공간의 필요성이 증가되고 있는 추세이다. 우주대공간 구축에 있어,기존의 PEB(Pre-Engineered Building)구조나 Pipe Truss구조는 span이 커짐에 따라 철재중량이 급격히 증대되고 장스판에는 적용이 어려운 구조적 문제가 발생하게 된다. 이러한 문제를 해결하는 구조방법 중 하나로 Space Frame이 고려되고 있으나 아직 국내에서는 Space Frame에 대한 연구가 미흡하여 그 활용성이 높지 않은 실정이다. 본 연구에서는 공사비용, 공사기간, 시공성 등에서 여러 장정을 지닌 Space Frame을 소개하고 무주대공간 구축에 있어 Space Frame을 적용한 사례분석을 통하여 Space Frame의 특징을 조사하고자 하였다. 더 나아가 향후 국내 건설업계에 무한한 발전 가능성을 가진 Space frame의 기본적 특성과 다른 구법들과의 비교를 통해 장점을 확인함으로써 Space Frame에 대한 국내연구를 활성화시키고 향후 실무를 담당하는 현장에서 무주대공간으로서의 Space Frame의 활용을 높이고자 한다.

• Steel and Composite Structures
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• 제37권2호
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• pp.193-209
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• 2020

In this paper, the efficiency of five Machine Learning (ML) methods consisting of Deep Learning (DL), Support Vector Machine (SVM), Random Forest (RF), Decision Tree (DT), and Gradient Tree Booting (GTB) for regression and classification of the Ultimate Load Factor (ULF) of nonlinear inelastic steel frames is compared. For this purpose, a two-story, a six-story, and a twenty-story space frame are considered. An advanced nonlinear inelastic analysis is carried out for the steel frames to generate datasets for the training of the considered ML methods. In each dataset, the input variables are the geometric features of W-sections and the output variable is the ULF of the frame. The comparison between the five ML methods is made in terms of the mean-squared-error (MSE) for the regression models and the accuracy for the classification models, respectively. Moreover, the ULF distribution curve is calculated for each frame and the strength failure probability is estimated. It is found that the GTB method has the best efficiency in both regression and classification of ULF regardless of the number of training samples and the space frames considered.

• Structural Engineering and Mechanics
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• 제29권4호
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• pp.391-410
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• 2008

In this article, a harmony search algorithm is presented for optimum design of steel frame structures. Harmony search is a meta-heuristic search method which has been developed recently. It is based on the analogy between the performance process of natural music and searching for solutions of optimization problems. The design algorithms obtain minimum weight frames by selecting suitable sections from a standard set of steel sections such as American Institute of Steel Construction (AISC) wide-flange (W) shapes. Stress constraints of AISC Load and Resistance Factor Design (LRFD) and AISC Allowable Stress Design (ASD) specifications, maximum (lateral displacement) and interstorey drift constraints, and also size constraint for columns were imposed on frames. The results of harmony search algorithm were compared to those of the other optimization algorithms such as genetic algorithm, optimality criterion and simulated annealing for two planar and two space frame structures taken from the literature. The comparisons showed that the harmony search algorithm yielded lighter designs for the design examples presented.