1. Design the purlin of a fink roof truss, the specifications for design are as follows: I. II. III. IV. V. VI. VII. Area of workshop = 11,500 sft. Span of the truss = 120 ft. Height of the truss = 14 of the span. Spacing of the truss = 1/5 to 1/4 of the span Wind velocity = 100 mph(Dhaka) Allowable tensile strength = 20 ksi. Roofing shall be corrugated with galvanized iron sheet, whose weight is 2.25 lb/ft.