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DEPARTMENT OF CIVIL ENGINEERING, LAKEHEAD UNIVERSITY Engineering 2136 – Steel Design Solutions for Assignment No.3, Fall 2006 Instructor: Dr. Y Gong 1. When a W-section comes off rolling machines, it is hot and has no strength, and then it is to cool in air. The flange tips cool more quickly than the flange-to-web junctions, and flange tips gain strength and stiffness in this process. When the center portions of flange and web cool, the material is restrained by the stiffer flange tips. Since cooling process cause material to contract, the contraction of the central portions of the section produce compressive stress in the flange tips. In the mean time, the flange-to-web junctions and the web are subjected to tensile stress to balance these compressive stresses. 2. Based on Tables 6-2 on page 6-6 and Table 6-3 on page 6-7 of Handbook (9 th edition, 2006). (1) W530 × 92, F y =300 MPa (2) S610 × 119, F y =300 MPa (3) L152 × 102 × 9.5, Group 1, F y =300 MPa (4) WT180 × 131, F y =300 MPa (5) HSS 305 × 203 × 8.0, F y =300 MPa (6) Plate of 80 mm thick, F y =280 MPa (7) W690 × 419, F y = 300 MPa. 3. 1
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