Civil Engineering Reference
In-Depth Information
4.3.2.2 Sensors Parallel to Expansion Joint (North-South Direction)
The movements of building PG-1 relative to PG-2 in the direction restrained by
the soil mass can be obtained from the measurements of the VW sensors installed
parallel to the expansion joints at the underside of the roof and level C slabs. Fig.
4.23 illustrates the temperatures and corresponding movements for the sensors
installed at the roof level.
Fig. 4.23
Measurements of VW Sensors Parallel to Joint at Roof Level
4.3.2.2.1 Roof Level Sensors
The data of the northern roof sensor show an initial relative movement of nearly 2
mm after installation, corresponding to a rise in temperature of approximately
20ºC. This movement indicates shortening of the sensor while the two structures,
PG-1 and PG-2, underwent expansion due to rise in temperature.
Fig. 4.24 demonstrates the physical behavior of the two buildings at the
expansion joint. The soil-restrained structure undergoes expansion movements
smaller than its unrestrained counterpart, resulting in positive measurements
confirming shortening of the VW sensor. The magnitude of the movement
recorded by the sensor is equal to the amount of relative movement undergone by
the two structures.
