1. (25-points) A built-up box girder is constructed out of A36 steel. Assume the section is...

 

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1. (25-points) A built-up box girder is constructed out of A36 steel. Assume the section is fully braced in the lateral direction. The top plate is 16"x1", the web sections are each 17"x1", and the bottom flange is 22"x2". i. ii. E: iii. Determine the distance from the top of the section to the elastic neutral axis (y), the elastic section modulus (S), and the yield moment (My). Determine the distance from the top of the section to the plastic neutral axis (Y), the plastic section modulus (Z), and the plastic moment (MP). Note whether the yield or plastic moment governs. k 16" 1"-thick 20" 22" 1. (25-points) A built-up box girder is constructed out of A36 steel. Assume the section is fully braced in the lateral direction. The top plate is 16"x1", the web sections are each 17"x1", and the bottom flange is 22"x2". i. ii. E: iii. Determine the distance from the top of the section to the elastic neutral axis (y), the elastic section modulus (S), and the yield moment (My). Determine the distance from the top of the section to the plastic neutral axis (Y), the plastic section modulus (Z), and the plastic moment (MP). Note whether the yield or plastic moment governs. k 16" 1"-thick 20" 22"