NFPA 290:2013-Standard for Fire Testing of Passive Protection Materials for Use on LP-Gas Containers

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NFPA 290:2013

Standard for Fire Testing of Passive Protection Materials for Use on LP-Gas Containers

آموزش افعال مجهول در زبان انگلیسی بخش اول passive 1

اختصاصی از فی توو آموزش افعال مجهول در زبان انگلیسی بخش اول passive 1 دانلود با لینک مستقیم و پر سرعت .

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این فایل به فرمت پاورپوینت بوده و افعال مجهول رو به همراه حدود بیست دقیقه فایل صوتی به زبان فارسی آموزش میدم . اگر در مورد مجهولات و مجهول کردن افعال مشکل دارید حتما به دردتون میخوره . اگر مشکلی در اجرای فایل داشتید حتما بهم خبر بدید : [e-mail]

Passive Control of Steel Structures Utilizing Cylindrical Friction Dampers

اختصاصی از فی توو Passive Control of Steel Structures Utilizing Cylindrical Friction Dampers دانلود با لینک مستقیم و پر سرعت .

نویسند‌گان:

[ h Mirzaeefard ] - M.Sc. Graduate, Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, Iran,

[ h.r samani ] - Instructor, Department of Civil Engineering, Islamic Azad University – Pardis Branch, Tehran, Iran

[ m mirtaheri ] - Associate Professor, Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, Iran

خلاصه مقاله:

In this investigation, seismic response of steel structures utilizing Cylindrical Frictional Dampers (CFD) is studied. CFD is an innovative frictional damper which comprises two principal elements, the shaft and the hollow cylinder. These two elements are assembled such that one is shrink-fitted inside the other. If the damper’s axial force overcomes the static friction load, the shaft inside the cylinder will move and results in considerable mechanical energy absorption. To assess the efficacy of CFD, various steel frames are constructed and analyzed using OpenSees software. Nonlinear time history analyses and Incremental Dynamic Analysis (IDA) are applied to the frames and clear distinction has been drawn between the frames comprising CFD and the counterparts without CFD to emphasize the effectiveness of CFD in altering seismic responses. The results show that CFD extremely improves the seismic response of the structure

کلمات کلیدی:

Passive control, Cylindrical Frictional Damper, Incremental Dynamic Analysis, Seismic response