Search results for " FRP"

Flexural behaviour of calcarenite masonry walls reinforced with FRP sheets

2015

The use of fiber-reinforced polymers (FRP) for structural strengthening has become increasingly popular in recent years. Several applications of FRP have been proposed and applied, depending on the target of the technique, kind and/or material of the structural member. In particular, because of their great tensile strength, FRP materials are commonly used to enhance the out-of-plane behaviour of masonry walls, allowing to increase their strength, ductility and improving safety against overturning. For these reasons, FRP laminates are often applied in vulnerable ancient buildings in seismic areas to reinforce façades and walls with poor structural features. However, some issues arise when ad…

Dissemination/Communication Plan. Period concerning the plan: 01.01.2018-31.12.2020.

2018

The plan concerning different dissemination/communication activities during three years of the project implementation is given. Scientific results are proposed to be disseminated in well-recognized bi-annual international conferences, such as European Conference on Composite Materials (ECCM) and International Conference on Composite Materials (ICCM). Self-archiving of the main project results is planned within subject-based open-access repositories, such as ResearchGate and Zenodo. Two scientific publications in Q1-Q2 SCI journals and two popular scientific publications in popular scientific Latvian journals are foreseen. All data files obtained within the project are to be stored in centra…

Compressive behaviour of eccentrically loaded slender masonry columns confined by FRP

2018

Abstract Fibre Reinforced Polymer (FRP) confinement represents an effective tool for retrofitting masonry piers or columns enhancing their structural performance. This technique has been widely studied in the literature mainly with reference to short columns, while no extensive information is available on the influence of second order effects on its efficacy in case of slender members. Within this framework, the presented study concerns a simplified method able to assess the effects of FRP confinement on the compressive behaviour of slender masonry columns. A proper constitutive law of FRP confined masonry in compression is adopted for performing a sectional analysis, in which also consider…

Flax, Basalt, E-Glass FRP and Their Hybrid FRP Strengthened Wood Beams: An Experimental Study

2019

In this study, the structural behavior of small-scale wood beams externally strengthened with various fiber strengthened polymer (FRP) composites (i.e., flax FRP (FFRP), basalt FRP (BFRP), E-glass FRP (&ldquo

RC beams retrofitted by FRP oriented in any direction: Influence of the effectiveness factors

2022

Shear strength of FRP-retrofitted RC beams is usually influenced by different brittle failure modes characterizing the collapse of the FRP reinforcement. The most significant analytical models for assessing the shear strength of FRP-retrofitted RC beams reflect the effect of brittle failure through an effectiveness factor “R”, which reduces the ultimate tensile strength of FRP. The brittle collapse of FRP reinforcement often leads to a lower shear contribution by steel stirrups due to hindering of the yielding of all stirrups involved by critical cracking. Some analytical models consider this phenomenon introducing a further effectiveness factor “r”, which reduces the yielding strength of s…

Nonlinear Analysis of Reinforced Concrete Frames: Safety Evaluation and Retrofitting Techniques

Capacità in compressione di colonne in calcestruzzo confinato con FRP/Acciaio in presenza di precarico

2017

Nell'ambito del recupero e rinforzo delle costruzioni esistenti, il confinamento di colonne in calcestruzzo armato con materiali polimerici fibro-rinforzati (FRP) e la tecnica di incamiciatura tramite il sistema combinato di angolari e piatti in acciaio (Steel Jacketing) risultano molto utilizzate, in quanto offrono notevoli vantaggi in termini di incremento della capacità portante e deformativa agli elementi strutturali che presentano carenze di requisiti sismici. L'esecuzione dell'intervento di rinforzo in condizioni di esercizio della struttura implica la presenza di uno stato tenso-deformativo esistente nelle colonne, causato dalla presenza dei carichi gravitazionali. Questo può comport…

Capacità portante di mensole tozze in calcestruzzo fibroso o rinforzate con FRP

2004

Seismic assessment and retrofit of a concrete building highly damaged by reinforcement corrosion

2020

In existing concrete structures damaged by corrosion, the limited quantity and poor distribution of reinforcements as well as a lack of seismic details are common to many cases because they are built before the advent of seismic codes. In this paper the seismic assessment and retrofit of a concrete building sited in Sicily is presented in order to show a case-study of a corroded reinforced concrete structure to be trans-formed with new structural elements for functional reasons linked to Civil Protection. After many decades of complete abandonment, the structure was strengthened with different strategies, allied to the construction of new steel-concrete composite floors: concrete and steel …

Finite element analysis of the out-of-plane behavior of FRP strengthened masonry panels

2017

Abstract In the present study a numerical model is proposed for the response of out-of-plane loaded calcarenite masonry walls strengthened with vertical CFRP strips applied on the substrate by means of epoxy resin. A simplified structural scheme is considered consisting in a beam fixed at one end, subjected to constant axial load and out-of-plane lateral force monotonically increasing. Two different constraint conditions are taken into account: in the first one, the panel is assumed free to rotate at the top end while, in the second one, the rotation is restrained. Three-dimensional finite elements are used for the calcarenite parts and an equivalent constitutive law available in the litera…