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

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INDEX<br />

iii<br />

4.10.3 Results <strong>of</strong> <strong>the</strong> PsD test n° 2 ........................................................................163<br />

4.10.4 Results <strong>of</strong> <strong>the</strong> PsD test n° 3 ........................................................................165<br />

4.10.5 Results <strong>of</strong> <strong>the</strong> PsD test n° 4 ........................................................................167<br />

4.10.6 Results <strong>of</strong> <strong>the</strong> cyclic test .............................................................................167<br />

4.11 CONCLUSIONS.....................................................................................................170<br />

4.12 REFERENCES .......................................................................................................171<br />

5 SEISMIC BEHAVIOUR OF RC COLUMNS EMBEDDING STEEL PROFILES ..... 174<br />

5.1 INTRODUCTION ...................................................................................................174<br />

5.2 THE INERD PROJECT..........................................................................................175<br />

5.3 DESCRIPTION OF THE PROTOTYPE STRUCTURE....................................................179<br />

5.3.1 Materials <strong>and</strong> mechanical properties.........................................................179<br />

5.3.2 Load combinations.....................................................................................181<br />

5.3.3 3D frame <strong>modelling</strong>....................................................................................184<br />

5.3.4 Design <strong>of</strong> <strong>the</strong> reinforced concrete columns................................................187<br />

5.3.5 Design <strong>of</strong> <strong>the</strong> fully encased composite columns .........................................190<br />

5.4 DESIGN OF BEAM-TO-COLUMN JOINTS ................................................................196<br />

5.4.1 Strength <strong>of</strong> <strong>the</strong> Inner Elements ...................................................................197<br />

5.4.2 Strength <strong>of</strong> <strong>the</strong> Outer Elements ..................................................................202<br />

5.5 THE EXPERIMENTAL TEST PROGRAMME ..............................................................208<br />

5.5.1 Design <strong>of</strong> <strong>the</strong> reduced section <strong>of</strong> <strong>the</strong> specimen to be tested........................208<br />

5.5.2 Test set-up <strong>and</strong> test programme .................................................................211<br />

5.5.3 Global test instrumentation........................................................................213<br />

5.5.4 Local test instrumentation..........................................................................214<br />

5.5.5 Test procedure <strong>and</strong> loading history............................................................216<br />

5.6 RESULTS OF THE TESTS .......................................................................................222<br />

5.6.1 RCT5 Specimen ..........................................................................................222<br />

5.6.2 COT9-COT10 Specimens ...........................................................................223<br />

5.6.3 COT11-COT12 Specimens .........................................................................227<br />

5.6.4 Comparison <strong>of</strong> <strong>the</strong> experimental results <strong>and</strong> comments.............................227<br />

5.7 NUMERICAL ANALYSES AND VALIDATION OF THE MECHANISMS.........................230<br />

5.7.1 FE Model <strong>of</strong> <strong>the</strong> specimens ........................................................................230<br />

5.7.2 Steel web panel shear mechanism verification...........................................232<br />

5.7.3 Concrete compression strut mechanism verification..................................235<br />

5.7.4 Concrete compression field mechanism verification..................................237<br />

5.7.5 Calibration <strong>of</strong> <strong>the</strong> mechanisms...................................................................238<br />

5.8 CONCLUSIONS.....................................................................................................240<br />

5.9 REFERENCES .......................................................................................................242

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