o describe the differential of bolt torque and bolt tap test on derrick structure
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Anchor Bolt Design for Civil Structural Engineers
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MEC103 MECHANICS OF DEFORMABLE BODIES
FLANGED BOL BOLT T COUPLINGS COUP LINGS ENGR. ROGELIO FRETTEN C. DELA CRUZ, CE INSTRUCTOR
FLANGED BOLT COUPLINGS
In shaft connection called flanged bolt couplings (see figure above), the torque is transmitted by the shearing force P created in the bolts that is assumed to be uniformly distributed. For any number of bolts n, the torque capacity of the coupling is
If a coupling has two concentric rows of bolts, the torque capacity is
where the subscript 1 refer to bolts on the outer circle
For rigid flanges, the shear deformations in the bolts are proportional to their radial distances from the shaft axis. Hence, the relation between P 1 and P2 is
If the bolts on the two circles have the same area, A 1 = A2, and if the bolts are made of the same material, G 1 = G2, the relation between P 1 and P2 reduces to
1.) A flanged bolt coupling consists of eight steel 20-mm-diameter bolts spaced evenly around a bolt circle 300 mm in diameter. Determine the torque capacity of the coupling if the allowable shearing stress in the bolts is 40 MPa.
2.) A flanged bolt coupling consists of eight 10-mm diameter steel bolts on a bolt circle 300 mm in diameter, and four 10-mm diameter steel bolts on a concentric bolt circle 200 mm in diameter. What torque can be applied without exceeding a shearing stress of 60 MPa in the bolts?
3.) A flanged bolt coupling is used to connect a solid shaft 90 mm in diameter to a hollow shaft 100 mm in outside and 90 mm in inside diameter. If the allowable shearing stress in the shafts and the bolts is 60 MPa, how many 10-mm-diameter steel bolts must be used on a 200-mm- diameter bolt circle coupling so that the coupling will be as strong as the weaker shaft?
4.) Six 20-mm diameter rivets fasten the plate to the fixed member, as shown in the figure. Determine the maximum shearing stress developed in the rivets caused by the 40-kN loads.
5.) The plate shown in the figure is fastened to the fixed member by three 10-mm diameter rivets. Compute the maximum value of P so that the shearing stress of any rivet does not exceed 70 MPa.
