The arch structure is less in house structure, which is widely used in large span public buildings and warehouses. In highway and railway construction, it is one of the basic structural systems of bridge engineering.
Bent structure is widely used in buildings. From the roof or roof beam column and foundation combined single bearing framework system, and the roof is supported in the column on the column, because in the end is embedded in the foundation, called bent bearing system. Bent frame structure according to the function of the housing needs of single span and multi span, symmetrical and asymmetric, such as high and unequal height, there are cranes and no crane, etc.. Span generally from 9 meters to 36 meters. In general about 6 meters, 12 meters are also available. The longitudinal structure of the bent frame is generally composed of connecting members and supports to form a stable structure.
This system can be industrialized production, assembly construction, construction convenience, low cost, China's single storey plant using more. Frame structure can be made of reinforced concrete structure and steel structure or the steel roof truss and reinforced concrete columns, as housing span size, determine the use of the plant requirements and other factors.
Frame structure we are familiar with. By the column and straight line, arc or broken line beam rigid connection of the load-bearing framework system, known as rigid frame, also known as portal frame. Compared with the frame structure, the portal frame has better economic index in the middle and small span without crane or only the small tonnage crane workshop. Due to the simple structure, simple and bright indoor, there is a larger space, used for small and medium halls, canteens, shopping malls, factories, warehouses and other buildings, one of the main load-bearing structural system.