Page 134 - Riem-Vol6_nº3

479 IBRACON Structures and Materials Journal • 2013 • vol. 6 • nº 3
R. N. F. do Carmo | J. Valença | D. Dias-da-Costa
til failure of a reinforced concrete beam with 3.0 m long, 12 cm
width and 27 cm height. The beam was produced with lightweight
concrete with a density of 1900 kg/m3, an average compressive
strength of 51 MPa at 28 days and 54 MPa at the test day (166
days after casting) [17-18]. The concrete Young’s modulus of
24 GPa was also experimentally measured. For the longitudinal
and transversal reinforcement hot rolled and ribbed steel bars of
S500NR-SD class were used. Tensile tests were performed to
measure the steel yielding stress, fsym, and the tensile strength,
fsum, 545 and 645 MPa, respectively.
The beam was simply supported at both edges, 2.8 m span, and was
subject to symmetrical loading, one concentrated load P which was
divided into two equal loads distanced 1.0 m from the supports. Thus,
the central region of the beam was theoretically under pure bending
Figure 4 – Cross section, structural scheme, shear force and bending moment diagrams
Figure 5 – General view of the test set-up