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2. Library stack - Wikipedia

   en.wikipedia.org/wiki/Library_stack

   In library science and architecture, a stack or bookstack (often referred to as a library building's stacks) is a book storage area, as opposed to a reading area. More specifically, this term refers to a narrow-aisled, multilevel system of iron or steel shelving that evolved in the 19th century to meet increasing demands for storage space. [ 3]

3. I-beam - Wikipedia

   en.wikipedia.org/wiki/I-beam

   An I-beam used to support the first floor of a house. An I-beam is any of various structural members with an I - or H -shaped cross-section. Technical terms for similar items include H-beam, I-profile, universal column ( UC ), w-beam (for "wide flange"), universal beam ( UB ), rolled steel joist ( RSJ ), or double-T (especially in Polish ...

4. Structural steel - Wikipedia

   en.wikipedia.org/wiki/Structural_steel

   Structural steel. Structural steel is a category of steel used for making construction materials in a variety of shapes. Many structural steel shapes take the form of an elongated beam having a profile of a specific cross section. Structural steel shapes, sizes, chemical composition, mechanical properties such as strengths, storage practices ...

5. Iron and steel industry in the United States - Wikipedia

   en.wikipedia.org/wiki/Iron_and_steel_industry_in...

   The United States is also a major importer of iron and steel, as well as iron and steel products. Employment as of 2014 was 149,000 people employed in iron and steel mills, and 69,000 in foundries. The value of iron and steel produced in 2014 was $113 billion. [ 1] About 0.3% of the US population is employed by the steel industry.

6. T-beam - Wikipedia

   en.wikipedia.org/wiki/T-beam

   T-beam. A T-beam (or tee beam ), used in construction, is a load-bearing structure of reinforced concrete, wood or metal, with a T -shaped cross section. The top of the T -shaped cross section serves as a flange or compression member in resisting compressive stresses. The web (vertical section) of the beam below the compression flange serves to ...

7. Ultimate tensile strength - Wikipedia

   en.wikipedia.org/wiki/Ultimate_tensile_strength

   Ultimate tensile strength (also called UTS, tensile strength, TS, ultimate strength or in notation) [ 1] is the maximum stress that a material can withstand while being stretched or pulled before breaking. In brittle materials, the ultimate tensile strength is close to the yield point, whereas in ductile materials, the ultimate tensile strength ...