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- Publisher
- Springer Journals
- Copyright
- 2016 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg
- ISSN
- 1738-494X
- eISSN
- 1976-3824
- DOI
- 10.1007/s12206-016-0830-1
- Publisher site
- See Article on Publisher Site
Abstract
Abstract A common approach for dynamic analysis in current practice is based on a discrete time-integration scheme. This approach can be largely attributed to the absence of a true variational framework for initial value problems. To resolve this problem, a new stationary variational principle was recently established for single-degree-of-freedom oscillating systems using mixed variables, fractional derivatives and convolutions of convolutions. In this mixed convolved action, all the governing differential equations and initial conditions are recovered from the stationarity of a single functional action. Thus, the entire description of linear elastic dynamical systems is encapsulated. For its practical application to structural dynamics, this variational formalism is systemically extended to linear elastic multidegree- of-freedom systems in this study, and a corresponding weak form is numerically implemented via a quadratic temporal finite element method. The developed numerical method is symplectic and unconditionally stable with respect to a time step for the underlying conservative system. For the forced-damped vibration, a three-story shear building is used as an example to investigate the performance of the developed numerical method, which provides accurate results with good convergence characteristics.
Journal
Journal of Mechanical Science and Technology – Springer Journals
Published: Sep 1, 2016