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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Earthquake Engineering Society of Korea
Journal Basic Information
Journal DOI :
Earthquake Engineering Society of Korea
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Volume & Issues
Volume 19, Issue 6 - Nov 2015
Volume 19, Issue 5 - Sep 2015
Volume 19, Issue 4 - Jul 2015
Volume 19, Issue 3 - May 2015
Volume 19, Issue 2 - Mar 2015
Volume 19, Issue 1 - Jan 2015
Selecting the target year
Effects of Higher Modes on the Response Spectra of High-rise Buildings considering the Kinematic Interaction of a Foundation System
Kim, Yong-Seok ;
Journal of the Earthquake Engineering Society of Korea, volume 19, issue 3, 2015, Pages 85~92
DOI : 10.5000/EESK.2015.19.3.085
Response spectra of a building are made with a SDOF system taking into account a first mode shape, even though higher modes may affect on the dynamic responses of a high-rise building. A soft soil layer under a building also affects on the responses of a building. In this study, seismic responses of a MDOF system were investigated to examine the effects of higher modes on the response of a tall building by comparing them with those of a SDOF system including the kinematic interaction effect. Study was performed using a pseudo 3D finite element program with seven bedrock earthquake records downloaded from the PEER database. Effects of higher modes on the seismic responses of a tall building were investigated for base shear force and base moment of a MDOF system including story shear forces and story moments. Study results show that higher modes of a MDOF system contribute to a reduction of base shear force up to 1/4-1/5 of KBC and base moment. The effect of higher modes is more significant on the base shear force than on the base moment. Maximum story shear force and moment occurred at the top part of a building rather than at a base in the cases of tall buildings differently from short buildings, and higher modes of a tall building affected on the base forces making them almost constant at the base. A soft soil layer also affects some on the base shear force of a high-rise building independently on the soft soil type, but a soft soil effect is prominent on the base moment.
Domestic Seismic Design Maps Based on Risk-Targeted Maximum- Considered Earthquakes
Shin, Dong Hyeon ; Kim, Hyung-Joon ;
Journal of the Earthquake Engineering Society of Korea, volume 19, issue 3, 2015, Pages 93~102
DOI : 10.5000/EESK.2015.19.3.093
This study evaluates collapse probabilities of structures which are designed according to a domestic seismic design code, KBC2009. In evaluating their collapse probabilities, to do this, probabilistic distribution models for seismic hazard and structural capacity are required. In this paper, eight major cities in Korea are selected and the demand probabilistic distribution of each city is obtained from the uniform seismic hazard. The probabilistic distribution for the structural capacity is assumed to follow a underlying design philosophy implicitly defined in ASCE 7-10. With the assumptions, the structural collapse probability in 50 years is evaluated based on the concept of a risk integral. This paper then defines an mean value of the collapse probabilities in 50 years of the selected major cities as the target risk. Risk-targeted spectral accelerations are finally suggested by modifying a current mapped spectral acceleration to meet the target risk.
Extracting Modal Parameters of a Layered Stone Pagoda Using TDD Technique
Kim, Byeong Hwa ; Moon, Dae Joong ; Lee, Do Hyung ;
Journal of the Earthquake Engineering Society of Korea, volume 19, issue 3, 2015, Pages 103~108
DOI : 10.5000/EESK.2015.19.3.103
This work introduces a modal testing and analysis results of the mock-up for a layered stone pagoda. The pagoda has been horizontally excited by an impact hammer. As to the measured acceleration time responses, the first five lower mode shapes and natural frequency are extracted by the TDD technique. It is observed that the time delay of a shear wave occurs through friction surfaces. Such phenomena cannot be described by using the traditional analytical models such as a continuum cantilever beam model or a discrete shear building model. However, the time delay typically affects only the phases of the pagoda system. The frequencies of the pagoda system are not affected by such time delay. It is found in the first time that the layered stone pagoda system has a set of closely placed modes in near of natural frequency. It is believed that such modes are due to the friction characteristics in friction surfaces. Based on the stick-slip friction model, it seems that the one of the closely placed mode can be a self-excited one.
New Hollow RC Bridge Pier Sections with Triangular Reinforcement Details: I. Development and Verification
Kim, Tae-Hoon ; Lee, Seung-Hoon ; Lee, Jae-Hoon ; Shin, Hyun-Mock ;
Journal of the Earthquake Engineering Society of Korea, volume 19, issue 3, 2015, Pages 109~120
DOI : 10.5000/EESK.2015.19.3.109
The purpose of this study was to investigate the performance of new hollow reinforced concrete (RC) bridge pier sections with triangular reinforcement details. The proposed triangular reinforcement details are economically feasible and rational and facilitate shorter construction periods. A model of pier sections with triangular reinforcement details was tested under quasi-static monotonic loading. As a result, proposed triangular reinforcement details was equal to existing reinforcement details in terms of required performance. In the companion paper, the parametric study for the performance assessment of new hollow RC bridge pier sections with triangular reinforcement details is performed.
New Hollow RC Bridge Pier Sections with Triangular Reinforcement Details: II. Parametric Study
Kim, Tae-Hoon ; Kim, Ho-Young ; Son, Je-Kuk ;
Journal of the Earthquake Engineering Society of Korea, volume 19, issue 3, 2015, Pages 121~132
DOI : 10.5000/EESK.2015.19.3.121
The purpose of this study is to investigate the behavior characteristics of new hollow reinforced concrete (RC) bridge pier sections with triangular reinforcement details and to provide the details and reference data. Among the numerous parameters, this study concentrates on the shape of the section, the reinforcement details and the spacing of the transverse reinforcement. Additional eight column section specimens were tested under quasi-static monotonic loading. In this study, the computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), was used. A innovative confining effect model was adopted for new hollow bridge pier sections. This study documents the testing of new hollow RC bridge pier sections with triangular reinforcement details and presents conclusions based on the experimental and analytical findings.
Analyses of Vertical Seismic Responses of Seismically Isolated Nuclear Power Plant Structures Supported by Lead Rubber Bearings
Cho, Sung Gook ; Yun, Sung Min ; Kim, Dookie ; Hoo, Kee Jeung ;
Journal of the Earthquake Engineering Society of Korea, volume 19, issue 3, 2015, Pages 133~143
DOI : 10.5000/EESK.2015.19.3.133
It is very important to assure the seismic performance of equipment as well as building structures in seismic design of nuclear power plant(NPP). Seismically isolated structures may be reviewed mainly on the horizontal seismic responses. Considering the equipment installed in the NPP, the vertical earthquake responses of the structure also should be reviewed. This study has investigated the vertical seismic demand of seismically isolated structure by lead rubber bearings(LRBs). For the numerical evaluation of seismic demand of the base isolated NPP, the Korean standard nuclear power plant (APR1400) is modeled as 4 different models, which are supported by LRBs to have 4 different horizontal target periods. Two real earthquake records and artificially generated input motions have been used as inputs for earthquake analyses. For the study, the vertical floor response spectra(FRS) were generated at the major points of the structure. As a results, the vertical seismic responses of horizontally isolated structure have largely increased due to flexibility of elastomeric isolator. The vertical stiffness of the bearings are more carefully considered in the seismic design of the base-isolated NPPs which have the various equipment inside.