Analysis and modelling of the seismic behaviour of high ... - Ingegneria
Analysis and modelling of the seismic behaviour of high ... - Ingegneria
Analysis and modelling of the seismic behaviour of high ... - Ingegneria
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3. SEISMIC BEHAVIOUR OF BOLTED END PLATE BEAM-TO-COLUMN STEEL JOINTS<br />
• analysing <strong>the</strong> <strong>seismic</strong> performance <strong>of</strong> partial strength bolted extended end<br />
plate joints with fillet welds, which represent an alternative to fully welded<br />
connections for use in <strong>seismic</strong> force resisting moment frames;<br />
• verifying in a low-cycle fatigue regime <strong>the</strong> feasibility <strong>of</strong> <strong>the</strong> mechanical<br />
approach adopted for joints undergoing monotonic loading, whereby <strong>the</strong><br />
properties <strong>of</strong> a complete joint are understood <strong>and</strong> obtained by assembling<br />
<strong>the</strong> properties <strong>of</strong> its component parts.<br />
The study was limited to one basic connection geometry representative <strong>of</strong> a typical<br />
European design, viz. bolted extended end plate connections with overmatching<br />
fillet welds, as depicted in Figure 3.1. However, different design parameters,<br />
among which <strong>the</strong> end plate thickness <strong>and</strong> <strong>the</strong> bolt diameter, were addressed. A<br />
series <strong>of</strong> tests on connection substructures <strong>and</strong> subassemblages subjected both to<br />
monotonic <strong>and</strong> cyclic displacement regime was carried out. These results allow <strong>the</strong><br />
component method to be appraised. Also mechanical <strong>and</strong> metallurgic<br />
characterization test data <strong>of</strong> <strong>the</strong> connection material are collected.<br />
Figure 3.1. Bolted extended end plate beam-to-column joint<br />
On <strong>the</strong> basis <strong>of</strong> <strong>the</strong> experimental results <strong>and</strong> <strong>the</strong> data collection, inelastic finite<br />
element (FE) analyses carried out by means <strong>of</strong> <strong>the</strong> ABAQUS code (Hibbitt,<br />
Karlsson & Sorensen Inc., 2001), both on isolated Tee Stub (ITS) connections <strong>and</strong><br />
on Complete Joints (CJ) have been performed. Therefore, both FE models were<br />
calibrated <strong>and</strong> <strong>the</strong> stress <strong>and</strong> strain state <strong>of</strong> <strong>the</strong> aforementioned connections was<br />
simulated both in <strong>the</strong> monotonic <strong>and</strong> in <strong>the</strong> cyclic displacement regime. Finally,<br />
some design parameters which influence <strong>the</strong> fracture resistance <strong>of</strong> steel bolted<br />
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