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2. Stairs - Wikipedia

   en.wikipedia.org/wiki/Stairs

   Riser-Tread formula: Sometimes the stair parameters will be something like riser plus tread equals 17–18 inches (432–457 mm); [37] another formula is 2 times riser + tread equals 24.6 inches (625 mm), the length of a stride. [14] Thus a 7 inches (178 mm) rise and a 10.6 inches (269 mm) tread exactly meets this code.

3. Flexural rigidity - Wikipedia

   en.wikipedia.org/wiki/Flexural_rigidity

   However, in cases of non-prismatic members, such as the case of the tapered beams or columns or notched stair stringers, the flexural rigidity will vary along the length of the beam as well. The flexural rigidity, moment, and transverse displacement are related by the following equation along the length of the rod, x {\displaystyle x} :

4. Howe truss - Wikipedia

   en.wikipedia.org/wiki/Howe_truss

   In practice, most wood stringers are 16 inches (410 mm) in width due to limitations in milling. There are usually six stringers in a bridge. [18] Building the deck for a railroad bridge requires that a stringer lie directly beneath each rail, and that a stringer support each end of the railroad ties. Ties are usually 6 by 8 inches (150 by 200 ...

5. Ladder - Wikipedia

   en.wikipedia.org/wiki/Ladder

   An extension ladder. A ladder is a vertical or inclined set of rungs or steps commonly used for climbing or descending. There are two types: rigid ladders that are self-supporting or that may be leaned against a vertical surface such as a wall, and rollable ladders, such as those made of rope or aluminium, that may be hung from the top.

6. Longeron - Wikipedia

   en.wikipedia.org/wiki/Longeron

   Interior of a Boeing/Stearman PT-17 showing small channel section stringers. In engineering, a longeron or stringer is a load-bearing component of a framework. The term is commonly used in connection with aircraft fuselages and automobile chassis. Longerons are used in conjunction with stringers to form structural frameworks. [1]

7. Deck (bridge) - Wikipedia

   en.wikipedia.org/wiki/Deck_(bridge)

   A grid deck uses beams and diaphragms as the supporting structure. The supporting system of a grid deck is analyzed using a grillage analysis. A slab deck is one where the deck is analyzed as a plate. If the slab has a stiffness that is different in two directions (at right angles), then the deck is known and analyzed as an orthotropic deck.