In earthquake-prone areas such as the ring of fire that crosses Indonesia, mitigation strategies and minimizing the risk of earthquake disasters need to be carried out to protect the nation’s population and assets. However, seismic risk assessment is not easy due to the diverse types and amounts of infrastructure and the unavailability of qualified procedures. This paper intends to use a nonlinear static procedure known as pushover analysis to predict the performance of structures and their fragility due to earthquakes. The fragility of a structure is defined as a probabilistic function that describes the conditional probability of exceeding the damage limit for different seismic intensities. An existing mid-rise concrete building structure was used as the object of analysis. A 3D finite element model of the building was set up on a computer and subjected to push-over loads. The resulting capacity curve was then converted into a capacity spectrum curve. Subsequently, the fragility curve of the building was established after the damage limits were set.