Analiza i kontrola ponašanja čeličnih ramova pri dejstvu zemljotresa
Analysis and Response Control of Steel Frames Subjected to Earthquakes
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The subject of the thesis is seismic analysis of steel plane frames with nonlinear semi
rigid and eccentric beam-to-column connections. A numerical model that includes both
nonlinear connection behaviour and geometric nonlinearity of the structure is developed.
A flexible connection is modelled by rotational spring with nonlinear moment rotation
relationship using threeparameter power model. The changes in element stiffness matrix
introduced by eccentricity due to finite dimensions of beam-column assemblage. The
presented numerical model of beam element has the same number of degrees of freedom
as the corresponding model in the conventional analysis used for the frames with fully
rigid connections. Viscous damping due to relative rotational velocity in connections is
also introduced and modelled by attaching viscous rotational dashpots at beam ends.
The flexural complex stiffness matrix for a beam element with semi-rigid connections and
viscous rotational dashpots is evalua...ted. A parametric study has been performed in order
to estimate the influence of connection flexibility, connection eccentricity, viscous damping
and second order theory on steel frame seismic response. The results of several example
calculations have been presented with illustrative diagrams and figures.
It is also considered two types of passive structure control systems: friction braces and
dissipative joint connections. The dissipative joint connection passive control proposed
and presented as very simply, inexpensive and efficient way to protect structures during
strong earthquakes. This passive system control need only some modification in beam-
to-column connection design in order to achieve predicted level of damping.
Based on theoretical problem formulation, a computer program ip developed to increase
efficiency of steel frames seismic analysis and design.