1,720,971 research outputs found
Comportamento sperimentale di pannelli in muratura di tufo rinforzati con materiali compositi
No full textMantov
COMPORTAMENTO SPERIMENTALE DI PANNELLI IN MURATURA DI TUFO RINFORZATI CON MATERIALI COMPOSITI
No full textMantov
Ecosmart reinforcement for a masonry polycentric pavilion vault
No full textIn the cultural life of modern societies great importance has acquired the preservation of existing and, in particular, ancient architectural heritage. With the inherent historical aspects, the economic implications have to be taken into account as well. Indeed, especially European cities and countries receive significant economic advantages by the existence of monuments and ancient suburbs. In this context, structural maintenance, strengthening and monitoring has gained an important academic and professional impulse. The present paper aims to present the results of a real scale experimental work regarding the application of an innovative seismic retrofitting technique for masonry walls and vaults by Hydraulic Lime Mortar strengthened by Glass Fiber Reinforced Polymer textile grids (HLM-GFRP) embedding new sensing systems as fiber optical sensors. The real scale specimen is a masonry polycentric pavilion vault that was damaged during the L’Aquila earthquake of April 2009. The need of eco compatibility of bonding material with masonry support implies the use of HLM-GFRP as strengthening system. On the other hand, the use of Fiber Bragg Grating (FBG) has a large number of advantages in opposite to electrical measuring methods. Example are: small sensor dimensions, low weight as well as high static and dynamic resolution of measured values, distributed sensing feature allowing to detect anomalies in load transfer between reinforcement and substrate and the location of eventual cracking patterns. A suitable Finite Element (FE) model is developed both to assess the effectiveness of the HLM-GFRP strengthening layers in retrofitting of the masonry vault and to define the strain field essential to the design of the FBG sensors network. © Gattulli et al
Simple modeling approach for the structural retrofitting of FRP-strengthened masonry systems
No full textStructural analysis of the Caserta Royal Palace timber roof connections
No full textPreservation of historical structures often includes evaluation of timber roof trusses. According to recent research achievements and European building design codes, connections can play a role in the response of timber structures, but have paramount relevance for assessment of historical constructions under serviceability and ultimate loading conditions. Whenever semi-rigid behaviour of connections is concerned, investigation within rotational properties of connections through refined numerical modelling is required. The objective of the present paper is to study the response under service loads of typical connections of ancient timber structures, by using finite element-based modelling. The model is calibrated against experimental and numerical results found in relevant literature and sensitivity analyses are carried out. An application to different connections of the roof trusses of the Royal Palace in Caserta is presented. Finite Element analysis seems to be able to simulate semi-rigid behaviour of joints within the elastic range. Numerical moment-rotation diagrams are calculated for the different connections found on the reference roof structures as a basic step for the global structural assessment under serviceability loading conditions. © 2008 Taylor & Francis Group, London
Simulations of FRP reinforcement in masonry panels and application to a historic facade
No full textThe aim of the paper is to propose and assess a simplified FE modeling strategy to simulate the global behavior of masonry structures externally reinforced with FRP composite strips applied with a grid configuration and anchored properly at their ends.
The nonlinear behavior of the masonry is represented by a mascroscopic smeared crack approach. The FRP strips are simulated by using simple nonlinear truss elements kinematically compatible with the finite element mesh of the masonry under the hypothesis of perfect adhesion. A two-step procedure is followed. First, the comparisons with the experimental results on in-plane loaded masonry panels reinforced with CFRP and GFRP strips validate the approach. Next, the in-plane seismic behavior of the main facade of Camponeschi Palace, a building of historical importance located in the city of L’Aquila (Italy), is used as a realistic example to evaluate the proposed approach for large masonry systems. The obtained results show that the model is able to capture fairly well the damage scenario induced by the 2009
L’Aquila earthquake. The effects of the FRP reinforcement on the in-plane behavior of the facade are presented
and discussed
Experimental bond behavior in masonry elements externally reinforced with FRP laminates
No full textCosenza (Italia
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