What are the classifications of bridges?

According to the purpose, it can be divided into highway bridge, highway-railway dual-purpose bridge, pedestrian bridge, tractor bridge and water bridge. According to the span size and total length of multiple spans, it can be divided into small bridges, medium bridges, large bridges and extra large bridges. \x0d\ According to the structure, it is divided into four basic systems: beam bridge, arch bridge, steel frame bridge and cable-supported bridge (cable-stayed bridge and suspension bridge). In addition, bridges with composite system can be divided into through bridges, half-through bridges and through bridges according to traffic L > \x0d\ can be divided into permanent bridges, semi-permanent bridges, temporary bridges \x0d\ can be divided into wooden bridges and temporary bridges according to material types. 1000 L0 & gt； 150 bridge100 ≤ l ≤1000 40 ≤ l0 ≤150 bridge 30