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bolted connections.pptx
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- 2. Advantages of BoltedConnections • Noiseless and quick fabrication • No special equipment/process needed for installation • Fast progress of work • The connection supports loads as soon as the bolts are tightened • HSFG bolts do not allow any slip between the elements connected • Due to the clamping action, load is transmitted by friction only and the bolts are not subjected to shear and bearing • Due to the smaller number of bolts, the gusset plate sizes are reduced. • Deformation is minimized • No heating is required • Alterations
- 3. Disadvantages of BoltedConnections • Bolted connection have lesser strength in axial tension as the net area at the root of the thread is less. • Under vibratory loads the strength is reduced if the connections get loosened. • Unfinished bolts have lesser strength because of non uniform diameter. • Architectural look.
- 4. Classification of boltedconnection • On the basis of resultant force transferred • On the basis of type of force experienced by bolts • On the basis forced transfer mechanism by bolts
- 5. • On thebasis of resultant force transferred – Concentric connections – Eccentric connections
- 7. On the basisof type of force experienced by bolts • Lap Joint • Butt Joint • Bolts in pure tension • Bolts with tension and shear Shear Force
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- 10. On the basisforced transfer mechanism by bolts • Bearing type • Friction type
- 11. Types of bolts •Bearing Type of bolts – Unfinished bolts – Finished bolts • High strength Friction grip bolts
- 12. Unfinished bolts Finished bolts •High strength Friction grip bolts
- 13. Failure of Boltedconnections • Failure of bolts due to Shear, bearing and tension • Failure of connection plates due to bearing, tearing or block shear failure
- 14. Failure of boltsdue to Shear, bearing and tension • Shear failure of bolts
- 15. • Bearing failureof bolts
- 16. • Tension failureof bolts
- 17. • Bearing failureof Plates
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- 19. TERMINOLOGY USED INBOLTED CONNECTIONS
- 20. • Pitch (P):Pitch is center to center spacing of bolts in a row, measured along direction of load. • Gauge Distance (g): It is the distance between the two consecutive bolts of adjacent rows and is measured at right angles to the direction of load. • End Distance (𝑒1): It is the distance in the direction of the from the center of bolt hole to the end of the plate • Edge Distance (𝑒2): It is the distance of bolt hole from the adjacent edge of the plate.
- 21. • Pitch distance(P): – Minimum pitch = 2.5X nominal dia. of bolt – Maximum Pitch 1) Tension member = P ≯ 16 t or 200 mm whichever is less t= thickness of thinner plate 2) Compression member = P ≯ 12 t or 200 mm whichever is less 3) Tacking bolts = 32t or 300 whichever is less 16t or 200 when exposed to weather Tension member = P ≯1000mm Compression member = P ≯ 600mm
- 22. • Gauge Distance(g) = The distance between the centers of any two consecutive fasteners in a line adjacent and parallel to an edge of an outside plate ≯ 100 mm plus 4t or 200 mm, whichever is less, in compression and tension members. t = is the thickness of the thinner outside plate.
- 23. • Edge Distance(𝑒1)and End Distance (𝑒2) – Minimum edge and end distance ≮ 1.7 x Hole Dia (for hand flame cut edges) – Minimum edge and end distance ≮ 1.5 x Hole Dia (Rolled steel sections) – Maximum edge distance and end distance e≯ 12.t.Ԑ Where Ԑ= 250 𝑓𝑦
- 24. Diameter of BoltHole (𝑑0)
- 25. Grade and propertiesof bolts
- 26. Strengths of bolted connections Design strengthof bolts Shear strength of bolts Bearing strength of bolts Tension strength of bolts (If any) Design strength of Plates Tensile strength of plate
- 27. • Number ofbolt required (N) = 𝑓𝑜𝑟𝑐𝑒 𝑖𝑛 𝑚𝑒𝑚𝑏𝑒𝑟 𝑏𝑜𝑙𝑡 𝑣𝑎𝑙𝑢𝑒 • Bolt value is minimum of strength of bolt in Shear , Bearing and Tension • Efficiency of bolted joint (ƞ)= 𝑠𝑡𝑟𝑒𝑛𝑔𝑡ℎ 𝑜𝑓 𝑗𝑜𝑖𝑛𝑡 𝑠𝑡𝑟𝑒𝑛𝑔𝑡ℎ 𝑜𝑓 𝑚𝑒𝑚𝑏𝑒