1,721,169 research outputs found
Bond tests to evaluate the effectiveness of anchoring devices for CFRP sheets epoxy bonded over masonry elements
No full textThe effectiveness of Fiber Reinforced Polymer (FRP) materials for external strengthening of existing masonry elements is strictly conditioned by debonding phenomena. To avoid or delay the debonding and, hence, attain higher failure loads or larger ductility at failure, end anchoring devices may be a very suitable solution. Several types of end anchoring devices have been proposed, especially for concrete elements, but for none of them design indications for predicting the increase in failure load have been suggested so far. This paper is firstly aimed to provide an overview of the most diffuse and efficient anchoring techniques and quantify their efficiency in terms of failure load increase. Then, it presents the results of a wide experimental program carried out by the author and concerning bond tests on masonry elements externally bonded with Carbon FRP sheets and provided of different types of end anchoring devices. The bond tests have been realized according to a single pull-push set-up. Single stones made of yellow tuff and prisms made of clay bricks were used as support for the bond tests. The experimental results have been examined in terms of debonding load, load-slips curves, distribution of axial strains and bond shear stress-slip relations in order to highlight the effectiveness of the different tested anchoring systems on both the local bond behavior and the global performance. Finally, some design indications are also provided basing on both the experimental results herein presented and literature data concerning similar anchoring systems
Experimental Tests and Modeling of Tension Stiffening in RC Ties Strengthened with FRP Laminates - Tesi di Dottorato in Ingegneria delle Strutture, XV ciclo, Università degli Studi di Napoli Federico II
No full textExperimental performances of RC Beams Strengthened with FRP materials
No full textThe present paper illustrates the results of an experimental program on Reinforced Concrete (RC) beams
externally strengthened with carbon Fibre Reinforced Plastic (FRP) laminates and Near Surface Mounted
(NSM) bars under monotonic and cyclic loads, the latter ones characterized by a low number of cycles in
the elastic and post-elastic range. Comparisons between experimental and theoretical failure loads are
discussed in detai
Case study: Seismic upgrade of a masonry bell tower by GFRP ties
No full textIn many cases masonry buildings present structural problems related to development of local mechanisms under seismic
actions. The solution to this weakness has to be chosen taking into account several aspects if the construction is ancient and is gifted of
monumental significance. In this paper the case of the Bell Tower of Santa Maria del Carmine Napoli, Italy is discussed; the construction
has been deeply examined by the writers performing experimental inquires in situ and theoretical analysis with three-dimensional models.
While the results obtained in the hypothesis of compact behavior of the structure have pointed out a low risk condition under seismic
actions, in contrast the study of local out-of-plane mechanisms, dealt with in detail in this paper, have evidenced an unsafe situation. To
avoid such mechanisms, connective systems with tie rods made of glass fiber-reinforced polymer laminates have been designed to be
inserted where local verifications are not satisfied. Design, application, and monitoring procedures of this innovative intervention are
discussed in detail herein
Historical, architectonic and structural investigations to conserve and rehabilitate heritage buildings: general tools and applications to case study
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