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

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5.1 Introduction<br />

5 SEISMIC BEHAVIOUR OF RC COLUMNS<br />

EMBEDDING STEEL PROFILES<br />

On August 17, 1999, a Mw 7.4 earthquake occurred on <strong>the</strong> 1500-km-long North<br />

Anatolian fault in north-western Turkey. The epicentre <strong>of</strong> <strong>the</strong> earthquake was near<br />

Izmit, 90 km east <strong>of</strong> Istanbul (Figure 5.1). After this <strong>seismic</strong> event, <strong>the</strong> Pacific<br />

Earthquake Engineering Research Center dispatched a “Reconnaissance Team” in<br />

<strong>the</strong> region <strong>of</strong> <strong>the</strong> epicentre to learn first h<strong>and</strong> about <strong>the</strong> performance <strong>of</strong> <strong>the</strong> civil<br />

infrastructure.<br />

Figure 5.1. Map <strong>of</strong> affected region showing recorded peak ground<br />

accelerations in circles (as percentage <strong>of</strong> acceleration <strong>of</strong> gravity)<br />

The geographic region impacted by <strong>the</strong> earthquake was somewhat narrow b<strong>and</strong>ed,<br />

centred on <strong>the</strong> fault <strong>and</strong> stretched from Istanbul in <strong>the</strong> west to Gölyaka <strong>and</strong> Düzce<br />

in <strong>the</strong> east. Damage to cocnrete construction was severe <strong>and</strong> widespread (Sezen

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