ur subsequent action involves the design of the testing gate structure. Following an in-depth examination of data pertaining to structural steel, we have opted to employ box steel for this purpose. The choice of box steel is attributed to its widespread availability in the market and its prominence in the field of structural construction, in alignment with industry standards established in both Thailand and Japan.Within these industry standards, there are two prevalent steel grades, namely SS400 and SS490, each characterized by distinct mechanical properties and chemical compositions. It is worth noting that SS400 stands as the most frequently utilized steel grade in this context. To facilitate the intricate design process, we have chosen to utilize the SolidWorks software.