SPO2FRAG v1.0: software for PUSHOVER-BASED derivation of seismic fragility curves

This article presents SPO2FRAG V1.0, the fi rst (beta) version of the Static PushOver to FRAGility software. The SPO2F RAG software is an interactive and user-friendly tool that can be used for approximate, computer-aided calc ulation of building seis mic fragility functions, based on static pushover analysis. It is coded in MATLAB ® environment and is currently under development at the Department of Structures for Engineering and Architecture of the University of Naples Federico II. At the core of the SPO2FRAG tool lies the SPO2IDA algorithm, which permits analytical predictions fo r incremental dynamic analysis summary fractiles at the sin- gle-degree-of-freedom system le vel. By effectively interfacing SPO2IDA with a series of oper- ations, intended to link the results of static pus hover analysis with the va riability that typically characterizes non-linear dynamic structural re sponse, SPO2FRAG provides an expedient so- lution to the computationally demanding task of analytically evaluati ng seismic building fra- gility, which would otherwise require a la rge number of non-linear dynamic analyses.