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Nishi-Tokyo-shi, Japan

Miyamura T.,Nihon University | Yamashita T.,Hyogo Earthquake Engineering Research Center | Akiba H.,Allied Engineering Corporation | Ohsaki M.,Hiroshima University
Earthquake Engineering and Structural Dynamics | Year: 2015

Dynamic finite element analyses of a four-story steel building frame modeled as a fine mesh of solid elements are performed using E-Simulator, which is a parallel finite element analysis software package for precisely simulating collapse behaviors of civil and building structures. E-Simulator is under development at the National Research Institute for Earth Science and Disaster Prevention (NIED), Japan. A full-scale shake-table test for a four-story frame was conducted using E-Defense at NIED, which is the largest shaking table in the world. A mesh of the entire structure of a four-story frame with approximately 19 million degrees of freedom is constructed using solid elements. The density of the mesh is determined by referring to the results of elastic-plastic buckling analyses of a column of the frame using meshes of different densities. Therefore, the analysis model of the frame is well verified. Seismic response analyses under 60, 100, and 115% excitations of the JR Takatori record of the 1995 Hyogoken-Nanbu earthquake are performed. Note that the simulation does not reproduce the collapse under the 100% excitation of the Takatori record in the E-Defense test. Therefore, simulations for the 115% case are also performed. The results obtained by E-Simulator are compared with those obtained by the E-Defense full-scale test in order to validate the results obtained by E-Simulator. The shear forces and interstory drift angles of the first story obtained by the simulation and the test are in good agreement. Both the response of the entire frame and the local deformation as a result of elastic-plastic buckling are simulated simultaneously using E-Simulator. © 2014 John Wiley & Sons, Ltd. Source


Yamashita T.,Hyogo Prefectural Institute of Technology | Miyamura T.,Japanese University | Akiba H.,Allied Engineering Corporation | Kajiwara K.,Hyogo Prefectural Institute of Technology
Transactions of the Japan Society for Computational Engineering and Science | Year: 2013

Recent advancement in parallel computing enables the precise finite element analysis of steel frames using solid elements. However, the finite element models used in the analysis have not been verified sufficiently. In this study, first, static finite element elastic-plastic buckling analyses of a square steel tube column subjected to a prescribed lateral displacement are performed with different meshes in order to verify the analysis model. It is shown that the accuracy and computation time of the analysis depend not only on the number of mesh divisions but also on the aspect ratio of each finite element. Then, dynamic elastic-plastic buckling analyses are performed for different meshes and different time increments. In the dynamic buckling problem, which is a kind of slow dynamics problem, accurate results can be obtained using a fine mesh but with a rather large time increment. © 2013 by the Japan Society for Computational Engineering and Science. Source


Kugimiya T.,Toshiba Corporation | Hirohata K.,Toshiba Corporation | Mukai M.,Toshiba Corporation | Miyake E.,Toshiba Corporation | And 3 more authors.
Proceedings of the ASME InterPack Conference 2009, IPACK2009 | Year: 2010

In this paper, the influence of the interface debonding area between the molding material and the metal frame on the fatigue reliability at die-mount solder joints in plastic IC packages was studied by means of large-scale finite element analyses. There are several factors causing the interface debonding between the molding material and the metal frame, such as manufacturing process, moisture absorption and deformation under field conditions. The debonding will change the structural stiffness of the packages and deformation shape during a thermal or mechanical load. Therefore, it is a critical issue for fatigue reliability. In this paper, three-dimensional large-scale finite element analysis is used for evaluating the influence of the debonding area on fatigue reliability under thermal cycling. The die-mount solder considered is the high-temperature solder 5Sn/95Pb, which is described by the nonlinear kinematic hardening model of Armstrong and Frederick in the finite element constitutive model. From the result of stress analyses, the debonding area has a large influence on inelastic strain, which is related to fatigue reliability. Large-scale finite element analysis is capable of providing useful guidance for structural design and material selection of plastic IC packages. Copyright © 2009 by ASME. Source


Yamashita T.,Hyogo Earthquake Engineering Research Center | Miyamura T.,Nihon University | Ohsaki M.,Hiroshima University | Kohiyama M.,Keio University | And 6 more authors.
ECCOMAS Thematic Conference - COMPDYN 2011: 3rd International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering: An IACM Special Interest Conference, Programme | Year: 2011

The project of E-Simulator is under way at Hyogo Earthquake Engineering Research Center (E-Defense), which belongs to National Research Institute for Earth Science and Disaster Prevention (NIED), Japan. E-Defense facilitates the world's largest shaking table. The E-Simulator uses the parallel EF-analysis software package called ADVENTURECluster (ADVC) as a platform, and we carried out elastoplastic seismic response analysis of high-rise building frame with over 70-million DOFs. In this study, we report the results of high-precision FE-analysis for simulation of dynamic collapse behavior of the 4-story steel building frame. The whole frame is discretized into hexahedral elements with linear interpolation functions. In order to improve the accuracy of collapse simulation, a new piecewise linear combined isotropic and kinematic hardening rule is implemented for steel material, and its parameters are identified from the uniaxial material test result. The stud bolts are precisely modeled using multipoint constraints and nonlinear springs. The wire-meshes in the concrete slab are modeled using hexahedral elements. The damping due to plastic energy dissipation of exterior walls is modeled by shear springs between the floors. The accuracy of the model is verified in comparison to the physical test of steel-concrete composite beam subjected to static deformation. It will be shown that elastoplastic dynamic responses of the 4-story frame can be estimated with good accuracy using a high-precision FE-analysis without resort to macro-models such as plastic hinge and composite beam effect. Source


Kohiyama M.,Keio University | Ohsaki M.,Kyoto University | Miyamura T.,Nihon University | Onda K.,Allied Engineering Corporation | And 5 more authors.
9th US National and 10th Canadian Conference on Earthquake Engineering 2010, Including Papers from the 4th International Tsunami Symposium | Year: 2010

The project of E-Simulator is under way at Hyogo Earthquake Engineering Research Center (E-Defense) of National Research Institute of Earth Science and Disaster Prevention (NIED), Japan, which facilitates the world's largest shaking table. The E-Simulator uses the parallel finite element (FE) analysis software package called ADVENTYRECluster (ADVC) as a platform. In this study, we report the results of high-precision FE-analysis for simulation of collapse behavior of the 4-story steel building frame that is the specimen of the full-scale total collapse shaking-table test conducted in September 2007 at E-Defense. It is shown that elastoplastic dynamic responses can be estimated with good accuracy using a high-precision FE-analysis without resort to macro models such as plastic hinge and composite beam effect. Source

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