In the book of ching, he talk about arch and lintelsI ，wood beam joist subfloor decking plank and beam. stell beam， open web joist  metal decking concrete beam. learned about the different forms and center points of the arches, as well as the different forms of lintels.Discussed the wooden beams, an essential part, simple and fast, is needed during construction, and there are many types.And steel cones have different shapes – IWC, mechanical steel.There are many ways to weld together, reinforce with these irons, and concrete beams.