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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5. SEISMIC BEHAVIOUR OF RC COLUMNS EMBEDDING STEEL PROFILES<br />
one <strong>of</strong> <strong>the</strong> goals <strong>of</strong> <strong>the</strong> InERD Project is to validate experimentally <strong>the</strong> joint<br />
mechanisms providing <strong>the</strong> shear resistance. Hence, once <strong>the</strong> presumed Joint<br />
Formulation had been derived, we were able to validate it thanks to <strong>the</strong><br />
experimental data obtained from <strong>the</strong> tests.<br />
The inner joint region <strong>behaviour</strong> is associated with two modes <strong>of</strong> failure, i.e. Shear<br />
<strong>and</strong> Bearing Failure <strong>and</strong> with <strong>the</strong> two correspondent resisting strengths in shear,<br />
Vjoint,sp <strong>and</strong> Vjoint,hb, where Vjoint,sp is given by <strong>the</strong> sum <strong>of</strong> Vjoint,wsp <strong>and</strong> Vjoint,ccs. The<br />
outer part <strong>of</strong> <strong>the</strong> joint deals with Shear <strong>and</strong> Bond Failure <strong>and</strong> with <strong>the</strong> associated<br />
shear strengths Vjoint,ccf <strong>and</strong> Vjoint,bf. As a result, <strong>the</strong> joint inner <strong>and</strong> outer resistances<br />
are evaluated as follows<br />
<strong>and</strong><br />
where<br />
Vjoint,inner = min {Vjoint,ps, Vjoint,hb} ( 5.15 )<br />
Vjoint,outer = min {Vjoint,ccf, Vjoint,b} ( 5.16 )<br />
Vjoint,ps = Vjoint,wps + Vjoint,ccs ( 5.17 )<br />
5.4.1 Strength <strong>of</strong> <strong>the</strong> Inner Elements<br />
Inner joint <strong>behaviour</strong> is characterized by two primary modes <strong>of</strong> failure. Panel shear<br />
failure, see Figure 5.14a, is similar to <strong>the</strong> collapse typically associated with<br />
structural steel or reinforced concrete joints; but in composite joints both structural<br />
steel <strong>and</strong> reinforced concrete elements participate. The bearing failure, shown in<br />
Figure 5.14b, occurs at a location <strong>of</strong> <strong>high</strong> compressive stresses <strong>and</strong> permits rigid<br />
body rotation <strong>of</strong> <strong>the</strong> steel column within <strong>the</strong> concrete beam.<br />
(a) (b)<br />
Figure 5.14. a) Panel shear failure; b) Bearing failure<br />
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