An experimental study on flexural strength enhancement of concrete by means of small steel fibers

Abstract

Cost effective improvement of the mechanical performances of structural materials is an important goal in construction industry. To improve the flexural strength of plain concrete so as to reduce construction costs, the addition of fibers to the concrete mixture can be adopted. The addition of small steel fibers with different lengths and proportion have experimentally been analyzed in terms of concrete flexural strength enhancement. The main objectives of the present study are related to the evaluation of the influence of steel fibers design on the increase of concrete flexural characteristics and on the mode of failure. Two types of beams have been investigated. The force level, deflection and time to failure of beams have been measured. The shear crack, flexural crack and intermediate shear-flexural crack have been studied. The steel fiber content controlled crack morphology. Flexural strength and time to failure of fiber reinforce concrete could be further enhanced if, instead of smooth steel fibers, corrugated fibers were used.

The effect of nonlinearity of acceleration histories to timber beam seismic response

“…The stress, strain, displacement, strength, fatigue, stiffness, geometry, crack paths, two cross-section interaction, uniaxial loading, multiaxial loading, material characteristics, and embedded footings that have been investigated and reported in the literature are directly and indirectly related to strain energy dissipation and damping of the material, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] all of these concepts are required to apply on strain displacement of timber structure to enhance seismic design.…”

Effect of flexural crack on plain concrete beam failure mechanism A numerical simulation

“…The fracture mechanics has been started by Griffith, it is based on the energy-based theory of failure [1]. The flexural crack on plain concrete beam has been experimentally investigated [2]. The state-of-the-art, prediction of threedimensional crack propagation paths has been numerically simulated to observe the damage [3].…”

Timber beam seismic design – A numerical simulation

“…In the construction industry and related field, several characteristics of different structure, structural elements, substructure and construction materials are numerically, theoretically and experimentally reported in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], but little research has been done on timber structure design. A timber structure state of art has numerically been investigated, to understand seismic resistance by the evaluation of the load, displacement and stress have been applied on the timber structures [1].…”