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QUESTION 4 a) Determine the design tensile strength of the plate (200 x 100) mm connected to a 12 mm thick gussets, using 20 mm bolts shown below, if the yield and ultimate stress of the steel used are 250 MPa and 420 MPa respectively, fy= 250 MPa fu= 450 MPa Major Topic Design tensile strength of the plate 9 Blooms Designation AN Score 6 b) To prevent local buckling occurring, it is necessary to limit the outstand/thickness ratios for flanges and depth/thickness ratios for webs of open sections. Column sections are classified as plastic, compact, semi-compact or slender, depending on their local buckling characteristics. Analyse the following section in the design of steel members: I. Plastic cross-section II. Compact cross-section III. Semi-compact cross-section