Civil Engineering Reference
In-Depth Information
The ranges of tilt movements recorded by level C sensors were smaller than
those recorded by level B sensors. This is typical of rigid frames where the
volumetric strains due to temperature cause the largest tilt in the vertical frame
elements spanning between the foundation (restraint) and the first level, as shown
in Fig. 4.16. In this case level B is the first unrestrained level.
Fig. 4.17 presents the results of the regression analysis of the level C sensors'
data. As expected, the linear correlation coefficients of the curve-fit for the data of
the western and center censor indicate a rather weak relationship between tilt and
temperature.
The data of the eastern sensor showed a stronger relationship, with a linear
correlation coefficient of nearly 52%. Nevertheless, all tilt data recorded on this
level had weaker relationship with temperature compared to the data obtained
from the sensors installed on the level below.
Furthermore, the graphics of Fig. 4.17 illustrate the distinct sets of linearly
related tilt and temperature data, corresponding to the temperature cycles recorded
by the sensors.
EXPANSION
CONTRACTION
Fig. 4.16
Typical Volumetric Expansion and Contraction of Rigid Frames
