而每一层楼是pre fab的，你在算结构的时候你是分析整栋楼还是单个pre fab楼层？

I googled for you.  Refer to the following link on the benefits of modular construction in ship-building:

http://www.sparusa.com/Presentations/Modularization%20Analysis%20Presentation%20Revised.pdf

You're welcome.