What are the main applications of trusses in construction? Is there any difference between round pipe joist and square pipe joist application scope?

Steel tube structure is not only widely used in marine engineering and bridge engineering, but also widely used in industrial and civil buildings. The application of steel tube structure in China's building structure is also more and more, such as Baosteel three-phase project adopts square tube truss, Jilin Ice Skating Exercise Hall, Harbin Ice and Snow Exhibition Hall, Shanghai "Oriental Pearl Tower" TV Tower and Changchun Nanling Ten Thousand People Stadium all adopt square steel tube as the main structural member. The Jilin Ice Skating Practice Hall, Harbin Ice and Snow Exhibition Hall, Shanghai "Oriental Pearl Tower" TV tower and Changchun Nanling 10,000 people gymnasium are using square steel pipe as the main structural components. In the field of public **** building, the unique structural form of steel tube structure is endless, such as Sydney Aquatic Center, the U.S. Gadsden Grove Crystal Church; single-story large space building field.

Based on the difference between the two applications, I will briefly cite one of the two products for reference only

The square tube fixed truss is one of the most common trusses on the market, which not only builds the span but also bears a great deal of strength, transportation and storage, installation and fixation, indoor and outdoor can be used. It can be transported, stored, installed and fixed, and can be used indoors and outdoors. The truss does not need square head connection, so it saves more cost

Round tube fixed truss is also a widely used truss, which can be used indoor and outdoor to build a showroom or background wall. The truss can replace the traditional aluminum alloy lighting frame (commonly known as TRUSS frame), the truss can not be folded, so the bearing capacity is also quite large, the maximum span of up to 13 meters without support. The round tube fixed truss also needs to be used with square head when it is used, the truss has