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A comparative study of seismic provisions between International Building Code 2003 and Uniform Building Code 1997

Earthquake Engineering and Engineering Vibration 2006年第1期5卷 49-60页

作者： Wenshen Pong Zu-Hsu Lee Anson Lee School of Engineering San Francisco State University San Francisco CA 94132 USA Department of Management and Information Systems Montclair State University Montclair NJ 07043 USA

This study focuses on the comparison of the Uniform Building Code （UBC） 1997 and International Building Code （IBC） 2003 in relation to the seismic design and analysis of special steel moment resisting frame buildings （SMRF）. This paper formulates a numerical study of a steel SMRF building, studied in four different situations, namely： as an office building in San Francisco; as an office building in Sacramento; as an essential facility in San Francisco, and as an essential facility in Sacramento. The analytical results of the model buildings are then compared and analyzed taking note of any significant differences. This case study explores variations in the results obtained using the two codes, particularly the design base shear and drift ratios as they relate to different locations and occupancy use. This study also proves that IBC 2003 is more stringent for the redundancy factor under design category E for the SMRF building, and drift limits for essential facilities.

关键词： Uniform Building Code 1997 International Building Code 2003 building periods special moment resisting frame redundancy factor

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DEM SIMULATION OF LIQUEFACTION FOR GRANULAR MEDIA UNDER UNDRAINED AXISYMMETRIC COMPRESSION AND PLANE STRAIN CONDITIONS

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Acta Mechanica Solida Sinica 2012年第6期25卷 562-570页

作者： Guobin Gong Peng Lin Yawei Qin Jun Wei Department of Civil Engineering Shantou University School of Civil and Environmental Engineering Shenzhen Graduate SchoolHarbin Institute of Technology School of Civil Engineering and Mechanics Huazhong University of Science and Technology Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology School of Civil Engineering Central South University

Based on three dimensional （3D） Discrete Element Method （DEM）, the paper presents simulation results of undrained tests on loose assemblies of polydisperse spheres under axisymmet- ric compression and plane strain conditions using a periodic cell. In the present work, undrained tests were modelled by deforming the samples under constant volume conditions. The undrained （effective） stress paths are shown to be qualitatively similar to experimental results in literature. A microscopic parameter in terms of redundancy factor （RF） is used to identify the onset of lique- faction （or temporary liquefaction）, with the condition of RF equal to unity defining the transition from ＇solid-like＇ to ＇liquid-like＇ behaviour. It is found that the undrained behaviour is governed by the evolution of redundancy factor under both undrained axisymmetric compression and plane strain conditions, and a reversal of deviatoric stress in stress path for medium loose systems oc- curs due to the fact that the system becomes a structural mechanism （RF 〈 1） transiently at the microscopic level during the evolution.

关键词： discrete element deviatoric stress periodic cell liquefaction redundancy factor

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DEM simulation of liquefaction for cohesionless media at grain scale

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Journal of Central South University 2012年第9期19卷 2643-2649页

作者：龚国斌查晓雄 Civil and Environmental Engineering Graduate School in ShenzhenHarbin Institute of Technology

Simulations of undrained tests were performed in a periodic cell using three dimensional(3D) discrete element method(DEM) program *** effective undrained stress paths are shown to be qualitatively similar to published physical experimental results of cohesionless media such as *** and temporary liquefaction are observed for very loose samples and medium loose samples,respectively.A new micromechanical parameter is proposed to identify whether liquefaction or temporary liquefaction occurs in terms of a redundancy *** relationship of redundancy factor and average coordination number is derived *** is demonstrated that the phase transition dividing the solid-like behaviour and liquid-like behaviour is associated with a redundancy factor of 1,which corresponds to an average coordination number slightly above 4.

关键词： simulation discrete element TRUBAL liquefaction redundancy factor coordination number

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