• Steel and Composite Structures
• /
• v.43 no.2
• /
• pp.139-152
• /
• 2022

Steel-reinforced concrete (SRC) L-shaped column is the vertical load-bearing member with high spatial adaptability. The seismic behavior of SRC L-shaped column is complex because of their irregular cross sections. In this study, the hysteretic performance of six steel truss reinforced concrete L-shaped columns specimens under the combined loading of compression, bending, shear, and torsion was tested. There were two parameters, i.e., the moment ratio of torsion to bending (γ) and the aspect ratio (column length-to-depth ratio (φ)). The failure process, torsion-displacement hysteresis curves, and bending-displacement hysteresis curves of specimens were obtained, and the failure patterns, hysteresis curves, rigidity degradation, ductility, and energy dissipation were analyzed. The experimental research indicates that the failure mode of the specimen changes from bending failure to bending-shear failure and finally bending-torsion failure with the increase of γ. The torsion-displacement hysteresis curves were pinched in the middle, formed a slip platform, and the phenomenon of "load drop" occurred after the peak load. The bending-displacement hysteresis curves were plump, which shows that the bending capacity of the specimen is better than torsion capacity. The results show that the steel truss reinforced concrete L-shaped columns have good collapse resistance, and the ultimate interstory drift ratio more than that of the Chinese Code of Seismic Design of Building (GB50011-2014), which is sufficient. The average value of displacement ductility coefficient is larger than rotation angle ductility coefficient, indicating that the specimen has a better bending deformation resistance. The specimen that has a more regular section with a small φ has better potential to bear bending moment and torsion evenly and consume more energy under a combined action.

• Cross-Cultural Studies
• /
• v.25
• /
• pp.131-158
• /
• 2011

In the Sakha(Yakutia) Republic, culture and politics continue to be interwined. Shamanism recently has come out of hiding after Soviet repression, and into fashion. Images of the shaman are changing in villages, where traditional healers have maintained their practices in difficult conditions, and in cities, where a resurgence of spirit belief and healing has led to the revitalization of their nationalism. Shamans and folk healers manipulate their own images, and in turn are changed by the upheavals of politicized cultural revitalization. In this complex and interactive context, folklore about traditional shamans has become especially rich and accessible. I argue here that religion has become an idiom through which competing definitions of homeland and national pride are being shaped. Until September 2002, Yakutsk had never had a 'temple' devoted to the practice of traditional shamanic beliefs. Indeed the whole concept that a building 'Archie Jiete' could contain or represent the beliefs, values and rituals of the Sakha people was new, and highly controversial.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.25 no.6
• /
• pp.513-523
• /
• 2012

The objective of this research is to examine how the lateral resisting system of selected prototypes are affected by seismic zone effect and shape irregularity on its seismic performance. The lateral resisting systems are divided into the three types, diagrid, braced tube, and outrigger system. The prototype models were assumed to be located in LA, a high-seismicity region, and in Boston, a low-seismicity region. The shape irregularity was classified with rotated angle of plane, $0^{\circ}$, $1^{\circ}$, $2^{\circ}$. This study performed two parts of analyses, Linear Response and Non-Linear Response History(NLRH) analysis. The Linear Response analysis was used to check the displacement at the top and natural period of models. NLRH analysis was conducted to invest base shear and story drift ratio of buildings. As results, the displacement of roof and natural period of three structural systems increase as the building stiffness reduces due to the changes in rotation angle of the plane. Also, the base shear is diminished by the same reason. The result of NLRH, the story drift ratio, that was subject to Maximum Considered Earthquake(MCE) satisfied 0.045, a recommended limit according to Tall Building Initiative(TBI).

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.26 no.3
• /
• pp.173-182
• /
• 2013

The building design projects which are being proceeded nowadays pursue a complex and various shape of structures, escaping from the traditional and regular shape of buildings. In this new trend of the architecture, there rises a demand of the research in the structural engineering for the effective realization of such complex-shaped buildings which disassembles the orthogonality of frames. As a distinguished characteristics of the buildings in a complex-shape, there frequently are inclined columns included in the structural frame. The inclined column causes extra axial force and bending moment at the beam-column connection so it is necessary to assess those effects on the structural behavior of the frame and the connection by experiment or analysis. However, with comparing to the studies on the normal beam-column connections, the inclined column connections have not been studied sufficiently. Therefore, this study evaluated the beam-column connections having an inclined column using nonlinear and finite element analysis method. In this paper, steel moment frames having inclined columns were analyzed by the nonlinear pushover analysis to check the global behavior and beam-column connection models were analyzed by the finite element analysis to check the buckling behavior and the fracture potentials.

• Nuclear Engineering and Technology
• /
• v.45 no.1
• /
• pp.89-98
• /
• 2013

In recent years steel-concrete composite shear walls have been widely used in enormous high-rise buildings. Due to high strength and ductility, enhanced stiffness, stable cycle characteristics and large energy absorption, such walls can be adopted in the auxiliary building; surrounding the reactor containment structure of nuclear power plants to resist lateral forces induced by heavy winds and severe earthquakes. This paper demonstrates a set of nonlinear numerical studies on I-shaped composite steel-concrete shear walls of the nuclear power plants subjected to reverse cyclic loading. A three-dimensional finite element model is developed using ABAQUS by emphasizing on constitutive material modeling and element type to represent the real physical behavior of complex shear wall structures. The analysis escalates with parametric variation in steel thickness sandwiching the stipulated amount of concrete panels. Modeling details of structural components, contact conditions between steel and concrete, associated boundary conditions and constitutive relationships for the cyclic loading are explained. Later, the load versus displacement curves, peak load and ultimate strength values, hysteretic characteristics and deflection profiles are verified with experimental data. The convergence of the numerical outcomes has been discussed to conclude the remarks.

• Acta Via Serica
• /
• v.7 no.2
• /
• pp.133-152
• /
• 2022

Both in popular perception and specialized literature, the Achaemenid Empire, for over two centuries the most important player from the Aegean to the Indus, is rarely evoked in correlation with the complex of socio-cultural dynamics which shaped the spaces of what has become known as the Silk Road(s). Building on the case study of the Pazyryk carpet on the one hand (King 2021, 353-361, Linduff and Rubinson 2021, 88-97), and of the spread of an artistic motive such as the quatrefoil on the other (Kim 2021), this paper explores the rich and complex nature of the commercial networks that flourished across Central Asia under the aegis of Achaemenid Great Kings. Both archaeological and literary evidence shall be discussed (especially the Aramaic Documents from Ancient Bactria: Naveh and Shaked 2012, and now King 2021, 315-320). If taken together and read against the grain, such material is significant for the following reasons. First, it suggests the existence - and the scale - of commercial activities directly fostered or indirectly promoted by the imperial administration in Central Asia, an area of crucial importance within the Achaemenid domains, but for which our evidence is rather scanty and difficult to assess. Second, it shows how the Achaemenid "Imperial Paradigm" (Henkelman 2017) affected the social and economic landscape of Central Asia even after the demise of the Empire itself, thus considerably shaping the world of the Silk Road(s) a century before the Ancient Sogdian Letters (de la Vaissière 2005, 43-70) or Zhāng Quiān's famous report.

• 한국연소학회:학술대회논문집
• /
• 2004.06a
• /
• pp.57-63
• /
• 2004

A two-dimensional direct numerical simulation was performed to investigate the flame behaviors of $CH_4/N_2$-Air counterflow nonpremixed flame interacting with a single vortex. The detailed transport properties and a modified 16-step augmented reduced mechanism based on Miller and Bowman's detailed reaction mechanism are adopted in this calculation. The results showed that an initially flat stagnation plane, on which an axial velocity was zero, was deformed into a complex-shaped plane, and an initial stagnation point was moved far away from a vortex head when the counterflow field was perturbed by the vortex. It was noted that the movement of stagnation point could alter the species transport mechanism to the flame surface. It was also identified that the altered species transport mechanism affected the distributions of the mixture fraction and the scalar dissipation rate.

• Structural Engineering and Mechanics
• /
• v.31 no.1
• /
• pp.25-38
• /
• 2009

Local failure of a primary structural component induced by direct air-blast loading may be itself a critical damage and lead to the partial or full collapse of the building. As an extensive research to mitigate blast-induced hazards in steel frame structure, a state-of-art analytical approach or high-fidelity computational nonlinear continuum modeling using computational fluid dynamics was described in this paper. The capability of the approach to produce reasonable blast pressures on a steel wide-flange section column was first evaluated. Parametric studies were conducted to observe the effects of section sizes and boundary conditions on behavior and failure of columns in steel frame structures. This study shows that the analytical approach is reasonable and effective to understand the nature of blast wave and complex interaction between blast loading and steel column behavior.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2010.04a
• /
• pp.263-266
• /
• 2010

비정형 형상의 초고층 건물이 증가함에 따라, 설계 시공 계획 단계에서의 시공 중 건물의 구조적 안정성 검토가 핵심 사항으로 부각되고 있다. 시공 중 비정형 초고층 건물의 안정성을 확보하기 위해서는, 횡력저항시스템이 완전히 형성되기 전 구조체 자중의 불균형 분포에 의해 발생하는 수직부재의 불균등 축소, 골조의 기울어짐 혹은 횡변위 등이 시공단계해석에 의하여 검토되어야 하며, 시공단계해석은 구조건전성모니터링, 시공 보정 프로그램, 시공계획 수립 등과 체계적으로 결합되어 진행되어야 한다. 이 논문은 시공 중 비정형 초고층 건물의 구조 안정성 검토를 위하여, 실제 비정형 초고층 프로젝트에 시공단계해석을 적용하였으며, 시공 중 초고층 건물의 안정성 확보를 위한 주요 검토 항목 및 방법을 제시하였다.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.26 no.1
• /
• pp.89-97
• /
• 2013

With regard to complex-shaped tall buildings whose plans and constructions have been gradually on the increase, this study was aimed to analyze their structural behaviors during construction by applications of construction sequences analyses to prototype models. For twisted tall buildings, total 18 models of with three conditions of a lateral load-resisting system, a twisting angle, and a construction method were selected. A diagrid system and a braced tube system were applied as a lateral load-resisting system. For each lateral load-resisting system, three types of plan with $0^{\circ}$, $1^{\circ}$, and $2^{\circ}$ twisting angles and three construction methods with construction sequences of exterior tube and interior frame were assumed. The structural performances of tall buildings under constructions were analyzed with results of lateral displacements from construction sequence analyses. Also, construction performances of the construction period and the maximum lift weight were compared.