الفهرس 
SEMI-RIGID CONNECTIONSOnly 14 pages are availabe for public view
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Abstract
This thesis presents an approach to the advanced nonlinear dynamic analysis of steel frames up to failure taking into consideration the various types of nonlinearties. In order to understand the basis of the design strategy for seismic-resistance of the structure, adopted in modern seismic practice, it is useful to study the nonlinear behavior of the structure. This study provides the designer with informations about the real behavior of the structure and the accurate method to calculate the yielding load and the failure mechanism. SAP2000N program.has capabilities to perform nonlinear static and dynamic analyses such as Time-History Analysis which is used to determine the dynamic response of a structure to a specified loading that may vary with time. The current research is extended to investigate the nonlinear dynamic behavior of different systems of steel frames under three different earthquakes. The behaviors of these systems have been presented in order to help the designer to choose the best system for his structure. Also study of the effect of varying the properties of the section of columns and the bracing and the effect of increasing the height of the frame had been presented. The 1994 Northridge Earthquake in USA has shown the vulnerability of welded moment connections in steel moment resisting frames subjected to earthquakes. Since then, as an alternative connection type, bolted connections, often called semi-rigid connections, are considered for the retrofit and new design of steel frames in high seismicity regions. The current research demonstrates the nonlinear dynamic behavior of different structural systems with semi-rigid connections under earthquake and compare their results with those obtained from rigid connection. The current analysis was concerned with the study of the nonlinear dynamic behavior of the substructure, such as pile, with the effect of base flexibilities. Different systems of steel frames with links at base (equivalent to piles) were studied and compared with other with fixed base.
The results is indicate that, the nonlinearity of substructure greatly affects in the responses of the structure.