## 5 Conclusions  
In this research, a field study was conducted on the fixation unit of post-installed anchors used in operation and power generation facilities installed in domestic power plants. Based on the results, a static/dynamic performance evaluation was conducted to determine the safety evaluation guidelines that meet the domestic seismic performance requirements.  
* In this study, the average maximum loads of post-installed anchors were calculated by evaluating the static performance of two concrete types (non-cracked and cracked concrete), based on which a dynamic load protocol was presented. A dynamic performance evaluation was conducted using this protocol to evaluate the seismic safety of concrete-embedded anchor bolts.
* The static shear test results of the M10 and M12 set anchors showed that steel failure occurred in both the cracked and non-cracked concrete. It appears that the anchor failure occurred before the load affected the concrete, owing to the sufficient bearing capacity of the concrete for the anchor bolt installed at the center of the concrete specimen and because of the concrete-anchor distance generated during the anchor installation.
* In the static pull-out test results, the M10 set anchor exhibited an anchor steel failure in both the cracked and non-cracked concrete. The M12 set anchor showed a concrete cone failure by the concrete-anchor adhesive force, owing to its slightly increased diameter. As with the M10 set anchor, the maximum pull-out load in the cracked concrete specimens was smaller than that in the non-cracked concrete specimens, owing to a reduction in the concrete-anchor adhesive force.
* In the dynamic shear test results of the M10 and M12 set anchors, both anchors exhibited steel failure. The M12 set anchor met the seismic performance verification criterion (80% of the static performance), but the M10 set anchor could not because its dynamic performance was reduced, owing to the cyclic loading.
* The results of the dynamic pull-out test showed that the M10 anchor met the seismic performance verification criterion in a non-cracked state, i.e., at the time of installation, but could not meet the criterion when cracks occurred, owing to aging and other loads. In the case of the M12 set anchor, the maximum pull-out loads under dynamic loads were found to be higher than those of the static tests. This appears to be because the clearance between the concrete and the set anchor, which existed at the time of the set anchor installation, contributed to the concrete-anchor frictional force generated by vibrations under the application of cyclic loading.  
Because this was an experimental study, it will be necessary in the future to additionally conduct analytical research to verify the reliability and applied parameters of the experiment.  
Conceptualization, S.L. and W.J.; methodology, S.L.; software, S.L.; validation, S.L. and W.J.; formal analysis, S.L.; investigation, S.L.; resources, S.L.; data curation, S.L.; writing--original draft preparation, S.L.; writing--review and editing, S.L., and W.J. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the power plant research program (21 IFIP-B128598-05) funded by the Ministry of Land, Infrastructure, and Transport.  
Not applicable.  
The authors declare no conflict of interest.