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A method for seismic response assessment of RC frames using simplified linear approach based on response factors. Research report
No full textAdeguamento Sismico con FRP e Test a Grande Scala di Pile da Ponte con giunti per Sovrapposizione di Insufficiente Lunghezza
No full textFRP Seismic Retrofit for Insufficient Lap-Splice: Large Scale Testing of Rectangular Hollow Section Bridge Piers
No full textFRP retrofit for insufficient lap-splice in rectangular hollow section RC bridge piers: numerical simulation and large scale testing, paper
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Seismic behaviour of r.c. hollow section bridge piers retrofitted with frp
No full textThe research work presented in this paper concerns the seismic assessment of hollow bridge piers
strengthened with fibre-reinforced polymer (FRP). The scope of the strengthening is to overcome some
common deficiencies deriving from the use of non-seismic design rules and leading to a not adequate
cyclic response. The strengthening design was studied by means of a parametric analysis considering
different fibres and geometrical parameters applied to standard case studies. Quasi-static cyclic tests were
performed on five 1:4 scaled piers designed according to old non-seismic Italian codes and strengthened
according to the previous analytical study. Efficiency of FRP strengthening was evaluated comparing the
experimental results with those obtained in a previous experimental research performed on similar not
strengthened specimens. Base shear vs. lateral deflection curves, dissipated energy and collapse
mechanisms comparison shows the achievable effectiveness once the debonding risk has been overcom
Seismic response of the San Salvatore Hospital of Coppito (L'Aquila) during the earthquake of april 6th 2009
No full textRisposta sismica del complesso ospedaliero San Salvatore de L'Aquila in occasione del terremoto del 6 aprile 2009
No full textModeling and Design Issues of Non Load-Bearing Permanent Shuttering Systems with Concrete under Seismic Loads
No full textSince the end of the 60 s non load-bearing permanent shuttering systems based on the use of formwork blocks filled with concrete or panels of insulating material covered with spray-concrete were used across Europe for buildings in non seismic areas.The formwork blocks are laid dry, thereby eliminating the various drawbacks caused by the use of mortar, subsequently filled with concrete, thus ensuring an adequate bearing structure. This construction method with a single operation resolves the problems related to the thermal and acoustic insulation, the thermal inertia and the structural behavior; this last taking advantage of the characteristics of the concrete used for the filling. These characteristics provide living comfort and savings on the heating costs. Same advantages characterize the permanent shuttering systems realized spraying concrete, which performs as load-bearing element, on panels of insulating material (such as polystyrene). Extension of the use of such construction techniques in the seismic regions is now envisaged: for this reason, series of experimental tests, both quasi-static and dynamic, are currently under development together with numerical studies. This paper presents the part of the work which faces several issues such as the development of guidelines for the finite element modeling, the evaluation of the internal actions and the design. Key problem is the sought balance between simplicity and accurateness of the model and between the straightforwardness of the design procedure and the resultant structural safety. The research presented in the paper deals with different possible modeling solutions (i.e. frame macro-elements or shell elements), their drawbacks and advantages, looking for a computationally efficient model. Furthermore performance requirements and design rules are discussed as an essential part of the guidelines under development. Finally, a software for the computer-aided design, from the geometrical modeling to the design of structural details, is briefly describe
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