Bridges can be divided into beam type, arch type, cable-stayed bridge and suspension bridge.

first, the beam bridge?

a beam bridge is a bridge with the main beam bending as the load-bearing component. According to the static system of main girder, it can be divided into simply supported beam bridge, continuous beam bridge and cantilever beam bridge. The following mainly analyzes the structure of continuous beam bridge: the superstructure of continuous beam bridge is a bridge structure commonly used in medium-span bridges, and prestressed concrete continuous beam bridge is its main structural form, which has the advantages of few joints, good rigidity, smooth and comfortable driving and so on, and is often the winner of bridge type scheme selection within the span of 31-121m m. The application of transverse prestressed concrete technology in T-beam, box beam and hollow slab bridge has achieved obvious technical and economic benefits.

second, arch bridge?

an arch bridge consists of buildings above the arch, arch rings and piers. Under the vertical load, the arch rib as a load-bearing structure mainly bears the pressure, and the support of the arch bridge bears both the vertical force and the horizontal force, so the requirements for the foundation and foundation of the arch bridge are higher than those of the beam bridge.

3. Cable-stayed bridge?

Cable-stayed bridge is a composite system bridge composed of three basic load-bearing members: beam, tower and cable. As the multi-point elastic support of the bridge span, the stay cables led out from the bridge tower make the main girder bear the force similar to that of a continuous bridge, thus greatly reducing the bending moment of the main girder section and effectively improving the spanning capacity of the main girder. The existence of stay cables makes the cable-stayed bridge become a high-order statically indeterminate structure, and the stay cables bear great tension, which transfers the load of the main girder to the main tower and puts great pressure on the main tower. On the one hand, the main girder bears the vertical supporting reaction provided by the stay cable, on the other hand, it is also subjected to the axial pressure generated by the horizontal component of the stay cable; Therefore, the cable force of the cable-stayed bridge has a great influence on the whole structure, and the final cable force is determined by the priority tension in the construction process. Therefore, the cable force of cable-stayed bridge has become an important factor affecting the stress of cable-stayed bridge. ?

fourth, suspension bridge?

suspension bridge, also known as suspension bridge, is a cable-bearing bridge with suspension cables as the main load-bearing structure, which is composed of pylon, suspender, anchor ingot and bridge deck structure. The suspension cables bear tension and are now mainly made of high-strength steel wires, which is the bridge with the largest span capacity at present. Modern suspension bridges are generally composed of pylon, main cable, anchorage, sling, stiffening beam and cable saddle. ?

Bridge types are divided into railway bridges, highway bridges, highway-railway bridges, pedestrian bridges, water transport bridges (aqueducts) and other special bridges (such as pipelines and cables). According to the obstacles, there are river-crossing bridges, valley-crossing bridges, overpass bridges (also known as overpasses), viaducts and trestles. According to the materials used, there are wooden bridges, steel bridges, reinforced concrete bridges, prestressed concrete bridges and masonry bridges (including brick bridges, stone bridges and concrete bridges). According to the different positions of the bridge deck in the bridge span structure, there are through bridges, through bridges and through bridges.