Tag Archive for Tag: ASD

Tag: ASD Bases for ASD and LRFD

ASD is based on elastic theory. Design limits the maximum unit stress a member is permitted to bear under service loads to a level determined by a judgmental, but  experience-based, safety factor. Building codes establish allowable unit stresses, which are normally related to the minimum yield stress for each grade of steel. Plastic design is based on the ultimate strength of members.

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Tag: ASD Bridge Decks

Highway-bridge decks usually are constructed of reinforced concrete. Often, this concrete is made with conventional aggregate and weighs about 150 lb per cu ft. Sometimes, it is made with lightweight aggregate, resulting in 100 to 110 lb per cu ft concrete. Lightweight aggregate normally consists of slag, expanded shale, or expanded clay. In some concrete decks, the wearing surface is cast integrally with

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Tag: ASD ASD versus LRFD

results in lighter or shallower members. For example, LRFD will typically result in material savings in the range of 10 to 15% when used for strength design of composite beams. In some cases, the material savings for certain components can be more than 30%. However, when the governing criterion is serviceability, such as deflection or vibration, ASD and LRFD will typically produce the same

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