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Analiza i kontrola ponašanja čeličnih ramova pri dejstvu zemljotresa

Analysis and Response Control of Steel Frames Subjected to Earthquakes

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2000
bitstream_6820.pdf (10.96Mb)
Authors
Salatić, Ratko M.
Doctoral thesis (Published version)
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Abstract
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.

Keywords:
čelični ramovi / nelinearna dinamička analiza / polukrute ekscentrične veze / viskozno prigušenje / disipativne čvorne veze / frikcioni spregovi / steel frames / nonlinear dynamic analysis / semi-rigid eccentric connections / viscous damping / dissipative joint connections / friction braces
Source:
2000
[ Google Scholar ]
URI
http://grafar.grf.bg.ac.rs/handle/123456789/1779
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  • Докторске дисертације / Doctoral dissertations
  • Катедра за техничку механику и теорију конструкција
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