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

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4. SEISMIC RESPONSE OF PARTIAL-STRENGTH COMPOSITE JOINTS In the transfer of the forces from the concrete slab to the column under hogging bending moment the longitudinal re-bars have played a relevant role. From the analysis of the strain gauges data it resulted that the reinforcing bars deform plastically. Figure 4.29. Cracks at an inclination of 45° in the exterior portion of the concrete slab Moreover, the good behaviour of the composite section under hogging bending moment is evident in the analysis of the response of the web panel too. In this case the distortion of the panel zone is only the 19% of the total joint rotation, and the transmitted shear force is smaller. This means that the connection worked well with maximum rotation of about 50 mrad greater than those observed in the column web panel. 135
4. SEISMIC RESPONSE OF PARTIAL-STRENGTH COMPOSITE JOINTS 4.8.3 Validation of the analytical model The composite beam-to-column joint, named CJ type, is modelled using a rotational spring to simulate the connections and a rectangular articulated polygon, whose dimensions are represented in the Figure 4.30, with a non linear translational spring simulating the column web panel. 136 composite column b a d rigid truss composite beams CJ type – Interior Joint a = 280 mm b = 382,8 mm d = (a + b) 1/2 CJ type – Exterior Joint a = 260 mm b = 382,8 mm d = d = (a + b) 1/2 Figure 4.30. Dimensions of rectangular articulated polygon The mechanical properties of the rotational spring are obtained using the Component Method according with ECCS - n°109 Procedure (1999); for the column panel in shear the Krawinkler’s model has been used. To model the rotational spring of the connection in a way that closely reproduces the expected behaviour, each component is modelled separately, taking account of the interior moments and forces in the members acting at the periphery of the web panel. The modelling of the actual behaviour of the connection is different in the case of sagging or hogging bending moment. The basic components identified in this design are given in Table 4.5, for sagging and hogging bending moment respectively. The design moment resistance Mj,Rd of this rotational spring is determined for sagging bending moment from: where: M = F ⋅ z ( 4.26 ) j, Rd j t, j, Rd j Ft,j,Rd is the effective design tension resistance of the bolt-row j; zj is the distance from the component j in tension to the center of the compression.
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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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5. SEISMIC BEHAVIOUR OF RC COLUMNS
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6. SUMMARY, CONCLUSIONS AND FUTURE
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Analysis and modelling of the seismic behaviour of high ... - Ingegneria

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