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In-plane vibration analysis of horizontally curved beams resting on visco-elastic foundation subjected to a moving mass
, Article Mechanical Systems and Signal Processing ; Volume 172 , 2022 ; 08883270 (ISSN) ; Abdoos, H ; Khaloo, A. R ; Mofid, M ; Sharif University of Technology
Academic Press
2022
Abstract
This paper deals with the in-plane dynamics of Horizontally Curved Beams (HCBs) supported by a visco-elastic foundation under the excitation induced by a moving mass. What has been included as worthy of detailed exposition is the inevitable contribution of the inertial actions of the mass object into the problem formulation. By taking into account the effect of Coriolis acceleration, centrifugal force and rotary inertia, the governing coupled non-linear differential equations of equilibrium for a simply supported HCB are derived. In the proposed solution, a new system of linear ordinary differential equations is distilled from the governing differential equations of motion, which can be...
Brace-frame interaction in tension braced MRFs
, Article International Conference on Numerical Analysis and Applied Mathematics, ICNAAM 2008, Psalidi, Kos, 16 September 2008 through 20 September 2008 ; Volume 1048 , 2008 , Pages 364-367 ; 0094243X (ISSN); 9780735405769 (ISBN) ; Mofid, M ; Alinia, M. M ; Greek Ministry of Education and Religious Affairs; European Soc. Computational Methods in Sci. Eng. (ESCMSE) ; Sharif University of Technology
2008
Abstract
This study investigates the possibility of sequential failure analysis of Tension Braced Moment Resisting Frames (TBMRFs) by examining its performance in the linear and nonlinear stages under idealized seismic loading conditions. The results obtained from rigorous analyses by means of numerical methods are utilized to set up and calibrate an analytical model which would appropriately differentiate the contribution shares of the frame and the bracing elements. The paper provides information on key response parameters, including interaction value between frame and brace elements, as well as tensile strength capacity and ductility capability of such systems. © 2008 American Institute of Physics...
New method in characterizing tensile softenig procedure in concrete
, Article ISEC 2011 - 6th International Structural Engineering and Construction Conference: Modern Methods and Advances in Structural Engineering and Construction, 21 June 2011 through 26 June 2011 ; June , 2011 , Pages 1145-1150 ; 9789810879204 (ISBN) ; Mofid, M ; Yazdani S ; Cheung S. O ; Singh A ; Ghafoori N ; American Society of Civil Engineers (ASCE); Architectural Institute of Japan (AIJ); Chartered Institute of Building (CIOB); et al.; University of Nevada Las Vegas (UNLV), College of Engineering; Wayne State College of Engineering ; Sharif University of Technology
Research Publishing Services
2011
Abstract
Several investigators worked on various aspects of tensile behavior of concrete because of its wide usage in structural design. One of the observable phenomena during tensile failure of concrete is strain softening, i.e. a negative slope in the stress-deformation diagrams. There are many kinds of experiment-based softening curves for concrete. In current research, use of newly introduced concept of fractal geometry and a failure model yields to a new softening curve for concrete. This new curve is denominated "Quasi-fractal" softening curve, which is a theorybased softening model. Comparison of Quasi-fractal softening curve with a set of proposed experimental softening curves has been...