With trusses you can obtain high strength of the bridge using rather thin and simple (i.e. cheap) elements. A drawback is that the required height of the side of the bridge rises with the span of the bridge, so trusses become less effective for larger spans compared to the cable bridges. Railway bridges have to sustain higher load than road bridges (trains are heavier), so trusses are an efficient design to increase strength.
A truss can be
used as a bridge or a cantilever, and for many other applications.
bridges and cantilever and windows
Although large box stores such as Home Depot and Lowe will have supplies of steel trusses, for large structures or specialty needs there are wholesalers and retailers that specialize in such. The latter generally fall under the category of building supply companies.
William Walker Clark has written: 'A planar comparison of actuators for vibration control of flexible structures' -- subject(s): Variable geometry trusses, Actuators, Flexible structures, Vibration
vestigial
vestigial
no
Trusses are triangular units that are used in construction to support the main structure. Put simply, they distribute the forces so that the structure is strong and stable enough to fulfill it's purpose.
It is dependent on where you live, but roof trusses are available to purchase and be delivered to your house. Or you could pick up the trusses yourself if you prefer those means.
Haresh Lalvani has written: 'Structures on hyper-structures' -- subject- s -: Polyhedra 'Comparative morphology of configurations with reduced part count derived from the octahedral-tetrahedral truss' -- subject- s -: Morphology, Structural analysis, Structural stability, Symmetry, Trusses
A lot.
Hsiao-Feng Kung has written: 'Dynamics and control of a spatial truss actuator' -- subject- s -: Variable geometry trusses, Actuators, Large space structures
Its used for determinig structures beneath the ocean floor.