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Seismic demand of an RC special moment frame building
Kim, Taewan,Kim, Jinkoo John Wiley Sons, Ltd. 2009 The structural design of tall and special building Vol.18 No.2
<P>Seismic design of a building is usually performed by using a linear static procedure. However, the actual behavior of a building subjected to earthquake is inelastic and dynamic in nature, and inelastic dynamic analysis is required to evaluate the safety of the structure designed by the current design codes. In this study, an RC special moment-resisting frame building was designed by IBC 2003. Maximum plastic rotation, dissipated energy of some selected members, and the drift demand were calculated to examine whether the inelastic behavior of the building followed the intention of the design code. In addition, the effect of internal moment-resisting frames (gravity load resisting system) on resisting lateral load was investigated. According to the analysis result, the building designed by IBC 2003 showed the inelastic behavior intended in the code and satisfied the design drift limit. Copyright © 2007 John Wiley & Sons, Ltd.</P>
Design of MR dampers to prevent progressive collapse of moment frames
Kim, Jinkoo,Lee, Seungjun,Min, Kyung-Won Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.2
In this paper the progressive collapse resisting capacity of steel moment frames with MR dampers is evaluated, and a preliminary design procedure for the dampers to prevent progressive collapse is suggested. Parametric studies are carried out using a beam-column subassemblage with varying natural period, yield strength, and damper force. Then the progressive collapse potentials of 15-story steel moment frames installed with MR dampers are evaluated by nonlinear dynamic analysis. The analysis results of the model structures showed that the MR dampers are effective in preventing progressive collapse of framed structures subjected to sudden loss of a first story column. The effectiveness is more noticeable in the structure with larger vertical deflection subjected to larger inelastic deformation. The maximum responses of the structure installed with the MR dampers designed to meet a given target dynamic response factor generally coincided well with the target value on the conservative side.
Seismic performance evaluation of a RC special moment frame
Kim, Taewan,Kim, Jinkoo Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.27 No.6
The probability and the reliability-based seismic performance evaluation procedure proposed in the FEMA-355F was applied to a reinforced concrete moment frame building in this study. For the FEMA procedure, which was originally developed for steel moment frame structures, to be applied to other structural systems, the capacity should be re-defined and the factors reflecting the uncertainties related to capacity and demand need to be determined. To perform the evaluation procedure a prototype building was designed per IBC 2003, and inelastic dynamic analyses were conducted applying site-specific ground motions to determine the parameters for performance evaluation. According to the analysis results, distribution of the determined capacities turned out to be relatively smaller than that of the demands, which showed that the defined capacity was reasonable. It was also shown that the prototype building satisfied the target performance since the determined confidence levels exceeded the objectives for both local and global collapses.
Seismic performance of tubular structures with buckling restrained braces
Kim, Jinkoo,Park, Junhee,Shin, Sung-Woo,Min, Kyung-Won John Wiley Sons, Ltd. 2009 The structural design of tall and special building Vol.18 No.4
<P>In this study 36- and 72-story framed and braced tubular structures were designed according to the current design code and their seismic performances were evaluated by nonlinear static and dynamic analysis. According to the analysis results, the tubular structures generally showed high earthquake-resisting capability. The framed tube structure showed lowest stiffness and strength compared with the other model structures. The braced tube structures showed larger strength but lower overall ductility compared with framed tube structures. When buckling-restrained braces were used instead of conventional braces, strength increased significantly compared with the framed tube, and ductility was enhanced compared with braced tube structures. As the load–displacement relationship estimated by static pushover analysis formed the lower bound of the dynamic analysis results, the response modification factors obtained based on the static pushover curve may safely be used for seismic design. Copyright © 2007 John Wiley & Sons, Ltd.</P>
Evaluation of progressive collapse potential of steel moment frames considering catenary action
Kim, Jinkoo,An, Dawoon John Wiley Sons, Ltd. 2009 The structural design of tall and special building Vol.18 No.4
<P>This study investigated the effect of catenary action on the progressive collapse potential of steel moment framed structures. Non-linear static and dynamic analyses of three- and six-story model structures with and without bracing were carried out following the alternate path method recommended by the General Services Administration 2003. According to the non-linear static push-down analysis results, the contribution of catenary action and the progressive collapse potential of structures increased as the number of story and the number of bay increased. The effect of catenary action increased significantly in braced frames, in which the movement of beam–column joints were fully restrained until the tensile capacity of beams located both sides of the removed column reached their maximum values. The non-linear dynamic analyses showed that the maximum deflection caused by sudden removal of a column decreased when the catenary action was taken into account. Copyright © 2008 John Wiley & Sons, Ltd.</P>
Seismic risk assessment of staggered wall system structures
Kim, Jinkoo,Baek, Donggeol 테크노프레스 2013 Earthquakes and structures Vol.5 No.5
In this study the seismic risk assessments of six- and twelve-story staggered wall system structures with three different structural variations were performed. The performances of staggered wall structures with added columns along the central corridor and the structures with their first story walls replaced by beams and columns were compared with those of the regular staggered wall structures. To this end incremental dynamic analyses were carried out using twenty two pairs of earthquake records to obtain the failure probabilities for various intensity of seismic load. The seismic risk for each damage state was computed based on the fragility analysis results and the probability of occurrence of earthquake ground motions. According to the analysis results, it was observed that the structures with added columns along the central corridor showed lowest probability of failure and seismic risk. The structures with their first story walls replaced by beams and columns showed lowest margin for safety.
Seismic behavior factors of buckling-restrained braced frames
Kim, Jinkoo,Park, Junhee,Kim, Sang-Dae Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.33 No.3
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.