tension pulls on the bridge, compression acts upon the supports of the bridge, and shear is created because of the wind blowing on the wind. extreme weather or earthquakes may cause torsion, but it's very rare that you'll find that in a bridge.
by contracting and expanding
The external forces were rough sex
External forces may refer to places.
Suspension bridges are one of the oldest engineering forms, dating back to the 4th century. Modern suspension bridges were made possible by the web truss, invented by John Augustus Roebling. The web truss made a very sturdy, rigid structure that could withstand storms, wind forces, and heavy loads.
Tinsile strength
Structures are able to withstand outside forces by having sufficient resistance and capacity so that they can respind with equal magnitude of the forces acting over them.
external
external
A common characteristic of reinforced concrete bridges is that they feature a combination of concrete and steel reinforcement to provide added strength and durability. The steel reinforcement helps to enhance the tensile strength of the concrete, allowing the bridge to better withstand forces like tension and bending.
what external forces are at work in mount saint helens
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To withstand the external pressure.