A Main Structure For Mast Framework Of Highway Signboard Is Made From A Round Steel 150 Mm In Diameter As Shown In Figur 1 (655.3 KiB) Viewed 42 times
A main structure for mast framework of Highway Signboard is made from a round steel 150 mm in diameter as shown in Figure 1. The weight of signboard framework is 230 kg locate at the center of the signboard. When the signboard is subjected to the direct wind blast, the average pressure 120 kPa is developed a normal force that acting at the center of the signboard. You are required to design and estimate size of bolt connec- tions and welding at the base supporting section. All calculations is in SI units. Used factor of safety 3 for all designs. Figure 1 Wind Pressure: 120kPa Frame Weight: 250Kg Force act on signboard 0.2 Design and ana a. Draw b. Deter sectio C. Deter d. Deter e. Comm Note: tudes
0.25 m 3.7m c. d. e. 0150 2.75 m Signboard Welding 2.5 m Bolt Mast base plate Detail A 2m Figure 2 Design and analyse the bolt and welding section as shown in Figure 2 (Detail A.) a. Draw a free body diagrams for the whole signboard structure. b. Determine the magnitudes of the force and moment reactions of the designed section. Determine number of bolt and size required from SAE grade 4.6 Determine the suitable weld size when E6010 electrode was used. Comments and suggest how to improve your results. Note: Draw a free body diagrams for each problems and determine the magni- tudes of all forces and moment reactions.
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