HC-Lecture15-Steel

HC-Lecture15-Steel - Heavy Construction Heavy Construction...

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Unformatted text preview: Heavy Construction Heavy Construction Lecture #15 Lecture #15 Steel L Prieto-Portar 2009 Steel framing characteristics. Advantages:- Light in proportion to its strength;- Strong and stiff (not the same); - Quick to erect;- Precise and predictable material;- Recyclable. Disadvantages:- Corrodes, and- Weakens quickly under high temperatures with a quick drop of strength and large deformations. Fireproofing: The reason why Codes limit the use of exposed steel is evident from the figure below. Cast iron, wrought iron and Steel. Although steel was known to the Romans, they were able to only produce very small batches for their swords and spear heads. Production of iron products remained limited up to the mid-1800s in the form of cast iron , which is an alloy of steel with 3 to 4% carbon. The first structural use of cast iron was a bridge in England during the late 1700s, which is still in use today. However, cast iron is very brittle (breaks like glass) and is difficult to work into structural shapes. Wrought iron is easier to form and became popular in mid-1800s. y the late 1800s the manufacturing processes of eel eveloped to such a high degree By the late 1800s the manufacturing processes of steel developed to such a high degree that it became the first choice of structural material. One definition of steel is any range of alloys of iron with less than 2% carbon . If the carbon content exceeds 2%, the steel is harder but brittle. If the percent of carbon is less than 0.1% the steel is weak and soft. An optimal percentage of carbon is around 0.3% . However, many other factors are involved, and commercial steel is sold in a wide range of strengths, from 36 ksi to over 270 ksi (kips per square inch). Steel is sold in hundred pound units ( cwt ). It is commonly priced including labor, for example $ 120/cwt. The Eiffel Tower was built with wrought iron and was completed in 1889. It took 5 months to build the foundations and 21 months for the tower. 15 March 1888 14 Sept. 1888 26 Dec. 1888 12 March 1889 The Eiffel Tower was built with 18,000 pieces of wrought iron sections held together with 2,500,000 rivets. Steel production. Steel is produced at a steel mills, which are most often mini-mills in each area of the nation. These small (mini-mills) produce most the structural steel in the US. There are a large number of standard steel shapes and therefore these mini-mills can not produce every shape. Some shapes must be purchased elsewhere in the US, or imported. The production of structural shapes takes place by passing hot steel through a series of rollers (called, hot rolled shapes), which are then cut and allowed to cool. This mill is turning steel flat sheet a steel flat sheet into a corrugated sheet for use as floor decking. Steel Alloys....
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HC-Lecture15-Steel - Heavy Construction Heavy Construction...

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