1,721,519 research outputs found
Finite element for R.C. beam-column joints
No full textIn this paper a finite element of beam-column joint is presented, which is intended to be employed in the nonlinear seismic analysis of r.c. frames. This should allow to include in the study of these structure the deformability of joints, which are instead assumed as rigid in the common practice. In this first approach the slippage of reinforcing bars is considered as prevailing on other sources of deformability. Good correlation has been obtained with experimental tests on beam-column joints
The new Italian code for seismic isolation of r.c. constructions and application to an existing bridge for seismic upgrading with a hybrid isolation-dissipation device
No full textIn this paper the new Italian seismic code issued in January 2008 is presented, with particular reference to the ample section devoted to constructions built with isolation and energy dissipation systems. Such attention is justified by the undisputed effectiveness of this design approach and by its increasing diffusion in the professional community. The code is based on Eurocode 8 [1], though resulting more synthetic and easier to use. During the last years of evolution, the code has significantly contributed to the development of new concepts in seismic isolation, such as the hybrid biaxial isolating/dissipating device here presented, obtained from parallel coupling of two different types of device: one mechanical, which realizes the necessary dissipation, and one elastomeric, which has the scope, beyond that of sustaining the vertical load, of reducing the deck residual displacement at the end of the seismic action. An application is shown of a seismically retrofitted highway bridge, in order to show the effectiveness of this device, both during, in terms of isolation, and at the end of the seismic event, in terms of residual displacements. For the sake of comparison, the same bridge is analyzed with different types of isolation techniques
Il rinforzo per sforzo normale e duttilità
No full text‘L’impiego dei materiali compositi fibrorinforzati (FRP) nella riabilitazione strutturale di elementi in c.a.
Confining reinforced concrete with FRP: Behavior and modeling
No full textRelevant issues regarding the behavior of concrete, either plain or reinforced, confined with FRP are presented. The paper describes the state of development of three research areas: experimental, analytical (modeling) and design-oriented. The achievements attained so far are recognized and the needs for further research and future advancements are indicated
Modellazione agli elementi finiti di nodi trave-pilastro in cemento armato con scorrimento delle barre di armatura
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