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Performance Assessment of Steel Moment Connections Retrofitted With Various Reduced Section Patterns

Sivandi-Pour Abbas

Civil and Environmental Engineering Reports

2019

Vol. 29, no. 4

1--17

It is of high importance in seismic retrofitting of lateral load-bearing systems to increase the connections performance. The crucial point in the steel frame retrofitting process is to create plastic hinges in these types of frames. The formation of plastic hinges in beams and near columns generates large strains on column flanges as well as welding metal and heated surroundings, which can lead to brittle failure. The connection should be designed in such a way as to allow plastic hinge formation at certain points of the beam. One such method suggested for retrofit connections is to reduce the beam section locally away from the connection zone. There are various patterns available to locally reduce the beam section, such as circular, elliptical, and symmetric/asymmetric. In recent years, different proposals have been presented to design these connections which vary from older instructions. For this study, radiused cuts in the flange and slotted holes in the web of connection beams were selected for retrofitting analysis. Cyclic behavior, energy damping levels, and ductility of these connections were studied and compared before and after the retrofit by using nonlinear dynamic analysis. The results showed that the symmetrical circular hole pattern in the beam flanges demonstrated reliable performance.

Synthesis of Live and Bounded Persistent Systems

Best E., Devillers R.

Fundamenta Informaticae

2015

Vol. 140, nr 1

39--59

This paper presents a dedicated Petri net synthesis algorithm for the case that a transition system is finite, live, and persistent. In particular, the paper delineates exactly when and how a structurally persistent net may be constructed, by crystallising, out of a general region-theoretic approach, a minimised set of simplified systems of linear inequalities. This extends previous results where reversibility, instead of liveness, played an important role.

Identification of cyclic and chaotic behavior in a dynamical system generated by phenotypic evolution

Karcz-Dulęba I.

Prace Naukowe Politechniki Warszawskiej. Elektronika

2006

z. 156

195-202

A discrete deterministic dynamical system generated by the expected value derived from the model of phenotypic evolution is considered. Depending on fitness functions and a standard deviation of mutation, the system converges not only to stable fixed points but also displays cyclic and chaotic behavior. To detect the phenomena an auto-correlation function, a phase space portrait and a power spectrum of trajectories of the system were exploited.