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

5. SEISMIC BEHAVIOUR OF RC COLUMNS EMBEDDING STEEL PROFILES
resistance of the concrete section prevails, the specimen COT9 shows the typical
behaviour for steel section: large hysteresis cycles with constant level of stiffness
and modest loss of resistance. At the subsequent cycles (6ey, 8ey and 10ey), the
specimen reacts to the imposed top displacement with a force equal to 85%, 70%
and 35% of the maximum reached level (110 KN), respectively. One important
aspect is that COT9 showed wide hysteresis cycles with the resisted shear force.
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COLUMN SHEAR (kN)
125
100
75
50
25
0
-25
-50
-75
-100
-125
-200 -160 -120 -80 -40 0 40 80 120 160 200
DISPLACEMENT (mm)
Figure 5.32. Column shear force vs. top displacement relationship for
COT9 specimen
COLUMN SHEAR (kN)
125
100
75
50
25
0
-25
-50
-75
-100
-125
-200 -160 -120 -80 -40 0 40 80 120 160 200
DISPLACEMENT (mm)
Figure 5.33. Column shear force vs. top displacement relationship for
COT10 specimen