Basic HTML Version
60
IBRACON Structures and Materials Journal • 2013 • vol. 6 • nº 1
Platform for dynamic tests: preliminary studies, design and construction
[9]). In this analysis were obtained, for each node, graphs in-
dicating the displacement, velocity and vertical acceleration
over 10 seconds. In Figures 6 and 7 were observed respec-
tively the deformation and the maximum acceleration of node
43866. Regarding accelerations may be mentioned that they
exceed the maximum values allowed in the practical guide
by Murray et al [15], probably because of their low stiffness.
Table 3 shows the maximum values of the dynamic response of
the structure at the nodes of Figure 4. In red are indicated direc-
tions of displacement, velocity and acceleration.
3.3 Stages of the construction of the platform
of dynamic tests
The platform of dynamic tests indicated in Figure 3 was designed
to conduct future numerical-experimental studies of slabs sub-
jected to dynamic loads generated by groups of people in motion.
With the numerical studies completed was performed the physi-
cal construction of the platform at the Structures Laboratory of
UNB. The platform was constructed following a planning of vari-
ous stages, observing a logical process of construction, which is
described below.
The first step for the construction of the structure is the union of
steel profiles of four inches with H type pillars, according to the
dimensions designed, with an area of approximately 30 m².
The second step was the assembly of two steel profiles 200 x 19.3
Figure 5 – Modal forms of the dynamic tests
platform dynamic tests by finite elements
Figure 6 – Evolution of displacement in the
vertical direction (Z axis) in time. (node 43866)
Figure 7 – Evolution of the acceleration in the
vertical direction (Z axis) in time. (node 43866)