Analysis and modelling of the seismic behaviour of high ... - Ingegneria

5. SEISMIC BEHAVIOUR OF RC COLUMNS EMBEDDING STEEL PROFILES
• Strain gauges SG-23 to 26 on the reinforcing bars of the beam as shown at
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Figure 5.26. All strain gauges are linear strain gauges. By means of these
measurements, coupled with those recorded by the Ω−transducer, it is possible
to obtain information about the deformation of the beam section in the
closeness of the joint during the test; and then, to reproduce the bending
moment acting in the joint.
SG-23-24
SG-25-26
Figure 5.26. Interior strain gauges
located in the rebars of the concrete
beam
5.5.5 Test procedure and loading history
The choice of a testing program and associated loading history depends on the
purpose of the experiment, type of test specimen, and type of expected failure
mode. The following testing procedures are intended as a reference, to produce an
adequate and, as much as possible, a unified way to carry out tests in order to
characterize the structural behaviour of structural component substructures.
The ECCS Procedure (1986) should help to verify the common design relationship
between a pseudo-static horizontal force and a specified ductility or displacement
given by Codes and Recommendations, such as, for instance the ECCS
Recommendations for Steel Structures in Seismic Zones. This procedure has been
chosen to set forward the characteristics of the element in that peculiar context.
The complete definition of the test also requires data on the combination of seismic
and non-seismic loads. The testing procedure may include preliminary classical
monotonic displacement increase tests or obviate them. In the first case, it is called
complete testing procedure; in the opposite case, it is called short testing
procedure. From the F-e curve recorded during the monotonic test, the
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conventional limit of elastic range Fy and the corresponding displacement ey may
be deduced. In the present study case, Fy and ey are not known at the beginning of