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

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5. SEISMIC BEHAVIOUR OF RC COLUMNS EMBEDDING STEEL PROFILES 5.7.3 Concrete compression strut mechanism verification Where the steel column web is encased in the concrete, the design shear resistance of the panel may be increased with the contribution of the inner concrete strut Vccs that is the design shear resistance of the concrete encasement of the web panel. Set of elements Evolution of the principal stresses of compression -40.00 -35.00 -30.00 -25.00 -20.00 -15.00 -10.00 -5.00 0.00 0.11 0.23 0.34 Top displacement: ey Top displacement: 2ey Top displacement: 4ey Top displacement: 6ey Top displacement: 8ey Top displacement: 10ey Table 5.17. Concrete compression strut mechanism – σmin,prin stresses 0.51 0.77 1.15 1.54 1.92 2.50 3.37 ∆/e y 4.50 5.64 6.80 7.94 9.09 10.23 11.37 11.43 235
5. SEISMIC BEHAVIOUR OF RC COLUMNS EMBEDDING STEEL PROFILES In composite connections, the concrete compression strut may be mobilised in resisting the shear either due to the presence of the horizontal plates welded to the column or simply due to friction and flexural forces acting in the steel column flanges. By means of a set of elements extracted in the concrete between the stiffeners and the web panel of the steel profile, it was possible to monitor the evolution of the principal stresses of compression for different imposed top displacement. As evidenced in Table 5.17, with the increasing of the displacement imposed at the top of the column, high stresses of compression are mobilized in the concrete strut. For a displacement equal to 6ey all the concrete in the zone reached the value of 40 MPa that represent the maximum allowed compression strength. Nevertheless, the effect of the confinement due to the presence of the steel profile and the stiffeners permits to reach greater value for an amplification of the top displacement. Finally, at an imposed displacement equal to 10ey the concrete in the interior zone and around the joint is crushed. The numerical results are in a good agreement with the experimental test, as evidenced in Figure 5.43. Figure 5.43. Failure of the joint during the experimental tests The shear resistance given by the concrete horizontally compressed by the elements inside the column Vj,hbf, is determined through a standard Stress Block Model. For a good development of the Horizontal Bearing Mechanism it is important to provide a sufficient concrete confinement. The provided amount of stirrups in the tested specimens seems to be adequate to this aim. 236
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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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Analysis and modelling of the seismic behaviour of high ... - Ingegneria

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