**5. Conclusions**

In this study, through a recently proposed fully coupled analysis framework (F2A), a fully coupled analysis of a combined system consisting of a semisubmersible platform (braceless) and a heaving-type WEC was carried out. A numerical model of the combined structure that was capable of simulating its motion and dynamic responses under different typical operational and extreme conditions was developed and used. Different types of analysis and comparison were performed to examine the fully coupled responses of the combined structure. The primary results are summarized as follows:


**Author Contributions:** Conceptualization, W.S., L.Z., C.M. and X.L.; methodology, W.S., C.M. and X.L.; investigation, J.L., L.Z., W.S. and C.M.; writing—first draft preparation, J.L., L.Z., W.S. and C.M.; review and editing, W.S., C.M. and X.L.; supervision, W.S. and C.M.; project administration, W.S.; funding acquisition, W.S and X.L. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the National Natural Science Foundation of China (Grant No. 52071058, 51939002). This work is also partially supported by LiaoNing Revitalization Talents Program (XLYC1807208) and special funds for promoting high quality development from department of natural resources of Guangdong province (GDNRC [2020]016).

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Acknowledgments:** The authors would like to thank the Yang Yang from Ningbo University for his valuable discussion of simulation in F2A software.

**Conflicts of Interest:** The authors declare no conflict of interest.
