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

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5. SEISMIC BEHAVIOUR OF RC COLUMNS EMBEDDING STEEL PROFILES 5.6.3 COT11-COT12 Specimens The test conducted on specimen COT11, is the only one with available data representing the C3 configuration for the Medium Ductility Case. The test finished at the real begin of the 10ey cycle with a residual resistance of ≈40kN, after having reached the maximum value of ≈95kN at 4ey. The failure occurred up to the middle column height, again far from the joint, which appeared rather deteriorated. Also the COT12 rupture confirmed this tendency of the other specimens belonging to the configuration C3, i.e. to show a collapse far from the joint region before the conventional end of test fixed at 10ey. 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 5.36. Column shear force vs. top displacement relationship for COT11 specimen 5.6.4 Comparison of the experimental results and comments In order to better understand the improvement in the behaviour of the specimens in term of strength and ductility due to the use of the inserted steel profile is important to compare the obtained results. A directed comparison is done in Figure 5.37, in which the envelopes of the behaviour of the specimens in term of shear force–top displacement are reported. The reader can see clearly that the presence of the steel profile increases the level of ductility for each level of the reached force. In others words, the specimens COT9, COT10 and COT11 show a reserve of strength for each imposed displacement greater than the reaction force exhibited from the specimen RCT5. This difference has been summarized in Table 5.14. 227
5. SEISMIC BEHAVIOUR OF RC COLUMNS EMBEDDING STEEL PROFILES 228 COLUMN SHEAR (kN) 125 100 75 50 25 0 -25 -50 -75 -100 RCT5 COT9 COT10 COT11 -125 -200 -160 -120 -80 -40 0 40 80 120 160 200 DISPLACEMENT (mm) Figure 5.37. Envelope of the specimen responses in term of shear force-top displacement IMPOSED DISPLACEMENT MAXIMUM REACTION FORCE (KN) RCT5 COT10 COT11 DIFFERENCE IN PERCENTAGE (%) OF THE REACTION FORCE COT10 − RCT 5 COT11− RCT 5 RCT 5 RCT 5 ey 57,37 48,68 61,12 -15,2 8,15 2ey 79,16 77,77 93,35 -1,76 20,56 4ey 96,91 95,44 106,44 -1,52 11,39 6ey 81,61 84,75 97,72 3,85 22,97 8ey 68,95 66,46 84,54 -3,62 26,73 10ey / 52,84 40,43 / / Table 5.14. Comparison in term of reaction force for the tested specimens Another important index for the comparison of the behaviour of the specimens is the accumulated energy, dissipated during the test. This index provides information about the ductility of the specimen, as the comparison is made in terms of absorbed energy for each level of imposed displacement; one may observe from Figure 5.38, that the specimens with the inserted steel profile dissipate an amount of energy that is double with respect to the dissipated energy of the reinforced concrete specimen. Moreover, the two configurations C1 and C3 are not so
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Dipartimento di Ingegneria Meccanic
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UNIVERSITÀ DEGLI STUDI DI TRENTO D
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Ai miei genitori
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INDEX 1 INTRODUCTION...............
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INDEX iii 4.10.3 Results of the PsD
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1.1 Introduction 1 1 INTRODUCTION I
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1. INTRODUCTION imposes precise con
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1. INTRODUCTION joints whilst 2D mo
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7 2 DUCTILITY AND SEISMIC RESPONSE
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2. DUCTILITY AND SEISMIC RESPONSE O
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3. SEISMIC BEHAVIOUR OF BOLTED END
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4. SEISMIC RESPONSE OF PARTIAL-STRE
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5. SEISMIC BEHAVIOUR OF RC COLUMNS
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Analysis and modelling of the seismic behaviour of high ... - Ingegneria

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