KINGSTON POLYTECHNIC COLLEGEDEPARTMENT OF CIVIL ENGINEERING

DESIGN OF STEEL STRUCTURE

QUESTION BANK (CHAPTER: STRUCTURAL FASTENERS & ECCENTRIC CONNECTIONS)1. Multiple Choice Questions (1 Marks):-i. Diameter of rivet d is generally calculated by following formula (a) d = 5 (b) d = 6 (c) d = 6.5 (d) d = 7where, t = thickness of plate in mmii. The overlap in the lap joint in case of fillet welding should not be less than ______________ times the thickness of the thinner plate. (a) 5(b) 7(c) 2(d) 3iii. The distance between centres of any two adjacent rivets is called (a) gauge (b) pitch (c) spacing (d) c/c distanceiv. Maximum permissible stress in power driven shop rivets in bearing is________________ MPa (a) 250 (b) 270 (c) 300 (d) 80v. Minimum pitch is ________________ times the diameter of the rivet hole. (a) 1.5 (b) 2 (c) 3 (d) 2.5vi. Throat thickness for a right angled fillet weld is (a) 0.7s (b) 0.75s (c) 0.65s (d) 0.6s where s = fillet sizevii. Maximum permissible stress in power driven field rivets in shearing is________________ MPa (a) 250 (b) 270 (c) 90 (d) 80viii. A row of rivets parallel to the direction of force is called a ___________________ line. (a) pitch(b) gauge(c) rivet(d) centre

Answers: i. bii. aiii. biv. cv. dvi. avii. cviii. bix.

2. Long Answer Type Questions (5 Marks):-i. Determine the rivet value of 18 mm diameter rivets connecting 10 mm plate and is in: (i) single shear, and (ii) double shear, The permissible stresses for rivets in shear and bearing are 80 MPa and 250 MPa respectively and for plate in bearing is 250 MPa. [ANS. 23891.8 N, 47783.6 N]ii. Find the safe load that can be transmitted by the fillet-welded joint shown in Fig. The size of the weld is 6 mm. [ANS. 95 KN]

iii. Describe the mode of failure of riveted joints with the help of diagrams.iv. What are the assumptions in the theory of Riveted Joints?v. What are the advantages and disadvantages of welded joints?vi. Draw a neat sketch of standard position of welding symbol, size and length of weld, clear spacing, etc. while marking welding details on drawing. 3. Long Answer Type Questions (7.5/10 Marks):-i. Determine the maximum load in the rivets of the eccentric connection shown in Fig.

[ANS. 31.95 KN]ii. A tie in a truss consists of a pair of angles ISA 90 x 60 x 10 mm welded on either side of a gusset plate 12 mm thick through the longer legs. Design the welded joint if the permissible stresses in angles and fillet welds are 150 MPa and 108 MPa respectively.

iii. Determine the size of the fillet weld required to join a bracket plate with the flange of a column as shown in Fig.

[ANS. 6 mm]

iv. Two plates 6 mm thick are joined by 14 mm diameter rivets in a triple staggered riveted lap joint as shown in Fig. In what way will the joint fail if allowable tensile stress for plate = 150 MPa; allowable shear stress for rivets = 90 MPa and allowable bearing stress for rivets = 270 MPa. Also find the efficiency of the joint.

[ANS. 1-1, 76%]

v. Figure shows a joint in the lower chord of a roof truss. Design the riveted connection if the permissible stresses are = 150 MPa, = 250 MPa, = 80 MPa

vi. Design welded end connection for a tension member consisting of a channel MC 300 (a = 46.3 cm2 ,tw = 7.8 mm) to develop full strength of the member. The length of the Joint is limited to 25 cm.vii. Find the maximum load inclined at 60 to the horizontal, which the bracket shown in Fig. can transmit if 5 - 20 rum diameter power-driven shop rivets are used and the plates connected are 10 mm thick.

[ANS. 29.27 KN]