AECT250-Lecture 6

AECT250-Lecture 6 - Lecture 6 Plate Girders A plate girder...

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Lecture 6 – Plate Girders A plate girder is a built-up beam comprised of plates welded together in the shape of an “ I .” Usually they are used in situations when standard W shapes are not adequate. They are fabricated in a shop and are typically much more expensive than rolled shapes, but often cheaper than trusses. Typically, the depth of plate girders range from about 1/10 to 1/12 of the span. Plate girders are designed in AISC Spec. chapter G p. 16.1-37 and 16.1-107. The design of a plate girder will be explained in the example below. Example GIVEN : The continuously laterally-braced welded unstiffened plate girder below. All loads shown are FACTORED and includes anticipated girder weight. Use F y = 50 KSI for web and flanges. REQUIRED : Design the plate girder. R1 R2 w u = 10 KLF 75’-0”
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Step 1 – Determine maximum factored moment, M u and shear, V u : M u = 8 2 L w u = 8 ) ' 75 )( 10 ( 2 KLF M u = 7031 KIP-FT V u = R1 = R2 = 2 L w u = 2 ) ' 75 )( 10 ( KLF V u = 375 KIPS
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AECT250-Lecture 6 - Lecture 6 Plate Girders A plate girder...

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