Structural Engineering — Quiz 1

Questions in this quiz (10)

1. A simply supported beam has a span of $$24$$ ft and carries a concentrated load of $$15$$ kips located $$10$$ ft from the left support. Determine the reaction at the left support.

   • 6.25 kips
   • 8.75 kips
   • 9.38 kips
   • 11.25 kips

2. A simply supported steel beam with a span of $$18$$ ft carries a concentrated load of $$12$$ kips at midspan. The beam has a moment of inertia $$I=240\ \mathrm{in^4}$$ and modulus of elasticity $$E=29{,}000\ \mathrm{ksi}$$. Determine the maximum deflection at midspan.

   • 0.082 in
   • 0.128 in
   • 0.214 in
   • 0.362 in

3. The axial force in member $$EC$$ due to the applied loads shown in the truss is most nearly:

   • 10 kips
   • 13.33 kips
   • 16.67 kips
   • 20 kips

4. A $$4\times8$$ lumber column has actual size of $$3.5$$ in by $$7.5$$ in. Bracing conditions are the same for buckling about both x- and y-axes. Its controlling radius of gyration in inches is most nearly:

   • 1
   • 1.15
   • 2.2
   • 4

5. For a planar truss, which of the following is a correct statement?

   • Its members are subjected to combined axial loads, shear forces and bending moments.
   • Its members need to have full moment connections at the joints.
   • For a stable and statically determinate truss, the supports must restrain rigid-body translation while allowing rotation at the joints.
   • The behavior of a truss is similar to that of a beam.

6. The truss shown below is:

   • Unstable
   • Statically determinate
   • Statically indeterminate of first degree
   • Statically indeterminate of second degree

7. The maximum positive shear force that can be developed at point $$C$$ of the beam due to a concentrated moving load of $$2$$ kips and a uniform load of $$1$$ kip/ft is most nearly:

   • 2 kips
   • 4.56 kips
   • 8.0 kips
   • 12.365 kips

8. For the truss shown, a vertical load of $$40\ \mathrm{kN}$$ is applied at joint $$B$$. Member $$BD$$ is the only member with a vertical force component at joint $$B$$. Determine the force in member $$BD$$.

   • 40 kN
   • 60 kN
   • 268 kip-ft
   • 268 kip-ft
   • 268 kip-ft
   • 80 kN
   • 315 kip-ft
   • 315 kip-ft
   • 315 kip-ft
   • 100 kN
   • 350 kip-ft
   • 350 kip-ft
   • 350 kip-ft
   • 402 kip-ft
   • 402 kip-ft
   • 402 kip-ft

9. A $$14\times22$$ column supports $$P_u=250$$ kip and $$M_u=5000$$ kip-in. Assume $$R_n=0.227$$, $$f_y=60{,}000$$ psi, and $$f'_c=4000$$ psi. Determine the required steel area.

   • 5.15
   • 19.5
   • 23000 lb
   • 23000 lb
   • 23000 lb
   • 6.16
   • 29000 lb
   • 29000 lb
   • 29000 lb
   • 7.25
   • 35000 lb
   • 35000 lb
   • 35000 lb
   • 50000 lb
   • 50000 lb
   • 50000 lb

10. A column is fixed at both ends. According to AISC, what is the effective length factor $$K$$?

    • 0.5
    • 0.7
    • 0.01 in
    • 0.01 in
    • 0.01 in
    • 1.0
    • 0.05 in
    • 0.05 in
    • 0.05 in
    • 2.0
    • 0.09 in
    • 0.09 in
    • 0.09 in
    • 0.12 in
    • 0.12 in
    • 0.12 in