truss bridges
Nota de aplicación
Bridges that employ trusses, which are structural members comprising straight pieces of metal or timber forming a series of triangles lying in a single plane, thus making the structure unlikely to be distorted by stress. Wooden truss bridges, in the form of covered bridges, were common in the United States from the 1870s to the 1930s; carefully fitted timbers were combined with iron rods for tension. Later, railroad bridges and other bridges were…