Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 31, No. 12 (December 2018) 1833-1839   

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  ASSESSMENT OF STRUCTURE-SPECIFIC SEISMIC FRAGILITY CURVES OF BUILDINGS USING SPO2FRAG
 
C. K. Yern, Fadzli M. Mohamed Nazri, M. Miari and M. Kassem
 
( Received: June 12, 2018 – Accepted: October 26, 2018 )
 
 

Abstract    Soft storey building is popular due to the functional and aesthetic purpose, despite its weakness in resisting seismic excitation. Nonlinear Static (Pushover) Analysis (POA) is a time saving and simple assessment procedure in Eurocode 8 (EC8). However, its reliability in designing structure remains a question. It is the same for fragility curve produced by using SPO2FRAG through POA. In this study, seismic performance of building using POA in EC8 is assessed. Empirical accuracy of fragility curve generated by POA (using SPO2FRAG) is studied and verified by Incremental Dynamic Analysis (IDA). Four models of regular and soft storey frame of 5- and 11-storey varying height were designed according to Eurocode 2 (EC2) and EC8. SAP2000 software was used to carry out POA. Capacity curve obtained is served as main input in SPO2FRAG software to generate fragility curve. Then, IDA is performed to generate IDA curves and fragility curves. Peak ground acceleration, PGA was converted into corresponding Sa(T1) using design spectrum from EC8. Performance levels of Life Safety (LS) and Near Collapse (NC) proposed by Vision-2000 are the main interest in this study. Results shown that the base shear resistance designed by using Lateral Force Method in EC8 is adequate.. Fragility curve generated by SPO2FRAG, indicated that regular 5-storey frame can capture the trend of fragility curve of IDA, but some deviation is observed for soft storey structure (5-storey). All 11-storey frames shown unsatisfactory match of fragility curve from what was generated by SPO2FRAG, compared to IDA.

 

Keywords    Pushover analysis, SPO2FRAG, Soft storey structure, Fragility curve, Eurocode, Performance level

 

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