External beam refers to the beam around the building, which not only bears the load of the floor, but also bears the load of the maintenance structure, wind and external suspension components. Inner beam refers to the load of the inner wall and floor of the building. Generally, the beam is in the stairwell, one side is the stairwell and the other side is the floor. The cross beam has no effect on the indoor shed.
Extended data:
Bridge engineering mainly studies the bridge span design, determines the bridge diameter, determines the height of the bridge deck considering the navigation and line requirements, determines the buried depth of the foundation considering the non-scouring or frost heaving of the basement, and designs diversion structures. Bridge scheme design; Bridge structural design; Bridge construction; Bridge grade; Bridge testing; Bridge maintenance and so on.
The ancient bridge is dominated by people and animals, with little load. The longitudinal slope of the bridge deck can be steep, and even steps can be laid. Since the establishment of the railway, the load borne by the bridge has doubled, and the standard requirements of the slope and curve of the line are high. It is necessary to build a railway network to increase economic benefits. Therefore, in order to cross larger and deeper rivers and canyons, bridges are forced to develop in large spans.
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