Civil Engineering Exams (Principles of Structural Analysis and Design) – Page 7
#120.
From the given truss, it is made up of guijo 100 mm x 1500 mm. It is subjected to a vertical load of 20 kN acting at C.
Allowable stress of wooden section.
Shear parallel to the grain = 1.0 MPa
Shear longitudinal for joints = 1.45 MPa
Compression Parallel to the grain = 11 MPa
Compression perpendicular to the grain = 5 MPa
A
140.55 mm
B
160 mm
C
180 mm
D
150 mm
Answer: 160 mm
#121.
From the given truss, it is made up of guijo 100 mm x 1500 mm. It is subjected to a vertical load of 20 kN acting at C.
Allowable stress of wooden section.
Shear parallel to the grain = 1.0 MPa
Shear longitudinal for joints = 1.45 MPa
Compression Parallel to the grain = 11 MPa
Compression perpendicular to the grain = 5 MPa
A
15.55 mm
B
13.55 mm
C
16.55 mm
D
14.55 mm
Answer: 14.55 mm
#122.
From the given truss, it is made up of guijo 100 mm x 1500 mm. It is subjected to a vertical load of 20 kN acting at C.
Allowable stress of wooden section.
Shear parallel to the grain = 1.0 MPa
Shear longitudinal for joints = 1.45 MPa
Compression Parallel to the grain = 11 MPa
Compression perpendicular to the grain = 5 MPa
A
2.26 MPa
B
2.62 MPa
C
1.26 MPa
D
3.62 MPa
Answer: 1.26 MPa
#123.
The figure shows the shear force at the column section of a building with transverse confining reinforcement.
Clear cover of 12 mm diameter ties is 40 mm
A
104 mm
B
70 mm
C
208 mm
D
140 mm
Answer: 208 mm
#124.
The figure shows the shear force at the column section of a building with transverse confining reinforcement.
Clear cover of 12 mm diameter ties is 40 mm
A
60 mm oc
B
70 mm oc
C
80 mm oc
D
90 mm oc
Answer: 70 mm oc
#125.
The figure shows the shear force at the column section of a building with transverse confining reinforcement.
Clear cover of 12 mm diameter ties is 40 mm
Determine the required spacing of the confining hoop reinforcement in accordance with the code for seismic design for shear parallel to long direction.
A
92 mm oc
B
140 mm oc
C
70 mm oc
D
75 mm oc
Answer: 70 mm oc
#126. Determine the outside diameter of hollow steel tube that will carry a tensile load of 500kN at a stress of 140 MPa. Assume the wall thickness to be one-tenth of the outside diameter.
A
113 mm
B
103 mm
C
93 mm
D
133 mm
Answer: 113 mm
#127. A force of 10 Newtons is applied to one end of a 10 inches diameter circular rod. Calculate the stress.
A
0.10 kPa
B
0.20 kPa
C
0.15 kPa
D
0.25 kPa
Answer: 0.20 kPa
#128. What force is required to punch a 20-mm diameter hole through a 10-mm thick plate? If the ultimate strength of the plate material is 450 MPa.
A
241 kN
B
386 kN
C
283 kN
D
252 kN
Answer: 283 kN
#129. A steel pipe 1.5 m in diameter is required to carry an internal pressure of 750 kPa. If the allowable tensile stress of steel is 140 MPa, determine the required thickness of the pipe in mm.
A
4.10
B
4.16
C
4.19
D
4.01
Answer: 4.01
#130. A spherical pressure vessel 400-mm in diameter has a uniform thickness of 6 mm. The vessel contains gas under a pressure of 8, 000 kPa. If the ultimate tensile stress of the material is 420 MPa, what is the factor of safety with respect to tensile failure?
A
3.15
B
2.15
C
2.55
D
3.55
Answer: 3.15
#131. A metal specimen 36-mm in diameter has a length of 360 mm. A force of 300 kN elongates the length by 1.20 mm. What is the modulus of elasticity?
A
88.419 GPa
B
92.658 GPa
C
95.635 GPa
D
76.325 GPa
Answer: 88.419 GPa
#132. A steel wire 5-m long hanging vertically supports a weight of 1200 N. Determine the required wire diameter if the stress is limited to 140 MPa and the total elongation must not exceed 4mm. Neglect the weight of the wire and assume /(E = 2000 ~GPa/)
A
3.22 mm
B
3.67 mm
C
3.44 mm
D
3.33 mm
Answer: 3.33 mm
#133. During a stress-strain test, the unit deformation at a stress of 35 MPa was observed to be \( 167 x 10^{-6} ~\frac{m}{m}\) and at a stress of 140 MPa it was \( 667 x 10^{-6} ~\frac{m}{m}\). If the proportional limit was 200 MPa, what is the modulus of elasticity? What is the strain corresponding to the stress of 80 MPa?
A
\(E = 210, 000 ~MPa\); \( \epsilon = 381 x 10^{-6} ~ m/m\)
B
\(E = 211, 000 ~MPa\); \( \epsilon = 318 x 10^{-4} ~ m/m\)
C
\(E = 220, 000 ~MPa\); \( \epsilon = 381 x 10^{-6} ~ m/m\)
D
\(E = 210, 000 ~MPa\); \( \epsilon = 311 x 10^{-4} ~ m/m\)
Answer: \(E = 210, 000 ~MPa\); \( \epsilon = 381 x 10^{-6} ~ m/m\)
#134. An axial load of 100 kN is applied to a flat bar 20 mm thick, tapering in width from 120 mm to 40 mm in length of 10 m. Assuming E = 200 GPa, determine the elongation of the bar.
A
4.33 mm
B
2.34 mm
C
3.34 mm
D
3.43 mm
Answer: 3.43 mm
#135. Steel bar having a rectangular cross-section 15mm x 20mm and 150 m long is suspended vertically from one end. The steel has a unit mass of 7850 kg/m3 and a modulus of elasticity E of 200 GPa. If a loaf of 200 kN is suspended at the other end of the rod, determine the total elongation of the rod.
A
44.3 mm
B
57.3 mm
C
54.3 mm
D
64.3 mm
Answer: 54.3 mm