Vulnerability of a Steel Frame Building to Near Field Ground Motion Using Hazus Methodology 

Μεταπτυχιακός Φοιτητής : Hassan Muhammad Shariq
Επιβλέπων Καθηγητής: Ψυχάρης Ι., Καθηγητής
Ημερομηνία : Φεβρουάριος 2014

The study aims is to investigate the consequences of inherent characteristics of near field ground motion on the seismic behavior of steel building by using Hazus Methodology.  The extensive seismic recordings in near to fault areas have provided clear evidence that ground motion in the near field of a rupturing fault differs from far field ground motions, as inherently it possess pulse-type character. Particularly, in the direction of rupture pulse events arrive in a single coherent time; result in a long–period, short duration and large amplitude of pulses (Somerville 1998) that occurs at the beginning of the record (the directivity effect).

In this present work, seismic evaluation been has been performed by means of a push-over & time history analysis conducted on a typical nine story pre-Northridge design steel moment resisting frame building. The associated damage limit states are defined according to the Hazus criteria for a single building. Push-over analysis was carried out to check the performance level & to specify the limit states on a pushover curve of a building by Sap-2000. To quantify the maximum displacement of a building, a non-linear time history analysis has been performed by using the existing seismic record. As a result the maximum displacement of the selected building under the referred scenarios is evaluated & plotted against a fragility curve, thus gives exceedance of probability of damage limit states of a building. The HAZUS resuls are then compared with the actual inelastic response of the structures (SAP-2000) in order to determine the adequacy of the results.

Studies revealed that the HAZUS methodology is quite compatible with the actual SAP outcomes under reffered ground motion and can be used to estimate the vulnerability of the building for the small to large magnitude of earthquakes. However, few earthquakes recordings, exhibits in discrepancy between the two methods, due to the fact that HAZUS criteria is based on approximate push over curve while SAP outcomes are on nonlinear time history analysis.

 

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