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دانلود رایگان مقاله تخصصی بررسی سیستم کنترل ارتعاش با دامپر(U شکل) بر اساس مکانیزم حرکت شبه خطی



Evaluation of vibration control system with U-dampers based on quasi-linear motion mechanism
Hiroshi Tagawa a,⁎, Jinhe Gao b
a Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8603, Japan
b Department of Civil and Environmental Engineering, East China Institute of Technology, Nanchang 330013, China
a b s t r a c t
This paper presents a new vibration control system for protection of steel structures from earthquakes. The proposed system, which uses a quasi-linear motion mechanism, achieves dissipation of seismic energy into the structure through yielding of U-shaped steel dampers. Based on the linear motion mechanism characteristics,the bracing members are subjected only to tensile force. This feature can eliminate the brace-buckling problem for braces, making rod members applicable to bracing members. This paper presents an outline of the vibration control system with subsequent evaluation of the lateral stiffness and strength of the frames with the proposed device. Six cyclic loading tests are conducted using the frame models with the proposed system. The accuracy of the evaluation is discussed by comparing the cyclic loading test results.
© 2011 Elsevier Ltd. All rights reserved.

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منبع : سیویل استارز






طبقه بندی: میراگرا، مقالات علمی،
برچسب ها:دانلود رایگان، مقاله تخصصی، بررسی سیستم کنترل ارتعاش، دامپر، U شکل، مکانیزم حرکت شبه خطی، دانلود رایگان پروژه،

[ چهارشنبه 1392/11/23 ] [ 08:37 ] [ جواد قربانی ]

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دانلود رایگان مقاله تخصصی شکستگی انعطاف پذیر(آزمایشات و محاسبات)
Ductile fracture: Experiments and computations
H. Li a,b, M.W. Fu a,*, J. Lua, H. Yang b
a Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China
b School of Materials Science, State Key Lab of Solidification Processing, Northwestern Polytechnical University, Xi’an, PR China

Numerous criteria have been developed for ductile fracture (DF) prediction in metal plastic deformation. Finding a way to select these DF criteria (DFCs) and identify their applicability and reliability, however, is a non-trivial issue that still needs to be addressed in greater depth. In this study, several criteria under the categories of ‘uncoupled damage criterion’and the ‘coupled damage criterion’, including the continuum damage mechanics (CDM)-based Lemaitre model and the Gurson–Tvergaard–Needleman (GTN) model, are investigated to determine their reliability in ductile failure prediction. To create diverse stress and strain states and fracture modes, different deformation scenarios are generated using tensile and compression tests of Al-alloy 6061 (T6) with different sample geometries and
dimensions...

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طبقه بندی: مقالات علمی، آزمایشهای عمرانی،
برچسب ها:مقاله تخصصی، شکستگی انعطاف پذیر، آزمایشات و محاسبات، Experiments and computations، دانلود رایگان پروژه، مهندس جواد قربانی،

[ شنبه 1392/11/19 ] [ 08:27 ] [ جواد قربانی ]

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