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

Reliability Analysis of Steel Structures under Buckling Load in Second-order Theory

اختصاصی از فی توو Reliability Analysis of Steel Structures under Buckling Load in Second-order Theory دانلود با لینک مستقیم و پر سرعت .

• مقاله با عنوان:

Reliability Analysis of Steel Structures under Buckling Load in Second-order Theory

• نویسندگان:

Hamed Abshari , M.Reza Emami Azadi , Madjid Sadegh Azar

• محل انتشار: هشتمین کنگره ملی مهندسی عمران - دانشگاه صنعتی نوشیروانی بابل - 17 و 18 اردیبهشت 93

• محور: سازه های فولادی

• فرمت فایل: PDF ، شامل 13 صفحه و زبان مقاله انگلیسی می‌باشد.

چکیــــده:

For studying the overall instability of members of steel structures, there are several methods in which overall buckling and geometrical imperfection effects considered in analysis. In first section, these methods are compared and ability of software to apply these methods is studied. Buckling loads determined from theoretical methods and software is compared for 2D one bay, one and two stories steel frames. To consider actual condition, buckling loads of three steel frames have various dimensions are calculated and compared. Also, uncertainties that exist in loading and modeling of structures such as geometrical imperfection, yield stress, and modulus of elasticity in buckling load of 2D framed steel structures have been studied. By performing these uncertainties to each reliability analysis procedures (first-order, second-order, and simulation methods of reliability), one index of reliability from each procedure is determined. These values are studied and compared.

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