Alcune considerazioni sulla tecnica di rinforzo con angolari e piatti metallici di elementi compressi in calcestruzzo

Adventages in using fibers in reinforced concrete members under compression

D-Regions

Flexural behavior of fibrous reinforced concrete corbels

Simplified analytical model for bearing capacity of FRC corbels

Comportamento flessionale di mensole tozze in calcestruzzo fibrorinforzato ad alta resistenza

Steel fiber-reinforced concrete corbels:experimental behavior and shear strength prediction

Corbels are structural members often used in reinforced concrete structures to transfer vertical and horizontal forces to principal members. This paper presents experimental research regarding the flexural behavior of corbels in plain and fibrous concrete and in the presence of steel bars. The study considers the influence of the type of concrete grade (normal- and high-strength concretes), of the fiber percentage and of the arrangement and percentage of the steel bars on the flexural behavior of the corbels. The results in terms of load-deflection curves and crack patterns show the effectiveness in using fibrous reinforced concrete corbels as well as in the presence of stirrups ensuring ad…

Influenza del carotaggio sullo stato tensionale e deformativo di elementi compressi

Some comments on the experimental behavior of FRC beams in flexure

In the present paper the experimental results, recently obtained by the authors, regarding the monotonic and the cyclic flexural response of normal and high-strength concrete beams reinforced with steel bars and discontinuous fibers, are shown. From the experimental results, all referred to low values of shear-to-depth ratios, it emerges clearly that the shear failure is brittle especially under cyclic actions highlighting the role of the fibers in the flexural behavior of the beams. The cyclic action produces a significant decay in the stiffness and in the strength capacity of the beams, and the addition of fibers reduces these negative effects. Form theoretical point of view good agreemen…

Simplified Model for Compressive Behavior of Concrete Columns Strengthened by Steel Angles and Strips

This paper presents an analytical model to determine the compressive response of concrete members, having a square transverse cross section and reinforced with steel angles at the corners and steel strips connecting the steel angles. The model evaluates the effects of transverse strips and steel angles on confinement pressures, including strength and buckling phenomena. Compressive response was evaluated in cases of directly and indirectly loaded elements. The data produced correlate well with available experimental data.

Comportamento ciclico di travi in calcestruzzo fibrorinforzato

Comportamento flessionale di mensole tozze in calcestruzzo fibrorinforzato

Fibrous reinforced concrete beams in flexure: Experimental investigation, analytical modelling and design considerations

Abstract The flexural behavior of plain and fibrous reinforced concrete (FRC) beams under monotonic and cyclic actions was analysed. Twelve beams were reinforced with top and bottom longitudinal deformed steel bars and transverse steel stirrups. Concrete, having 30 MPa cylindrical strength, was reinforced with hooked steel fibres at a volume percentage of 1%. Beams, 600 mm in length and with a square side cross-section of 150 mm, were tested in flexure using a three point bending test, adopting three different cover thicknesses of 5, 15 and 25 mm, respectively. The results obtained show that the addition of fibers increases the bearing capacity of the beams and ensures more ductile behaviou…