Structural Analysis Questions and Answers – Equivalent Lateral Force Procedure for Estimating Seismic Loads – 1

This set of Structural Analysis Multiple Choice Questions & Answers (MCQs) focuses on “Equivalent Lateral Force Procedure for Estimating Seismic Loads – 1”.

1. Seismic loads are directly proportional to the exposed area of the building.
State whether the above statement is true or false.
a) True
b) False

Explanation: Instead, seismic load is proportional to the distribution of mass of the building above the considered level.

2. Which types of forces are generated during earthquake?
a) Vertical shear
b) Horizontal shear
c) Bending moment
d) Combination of horizontal and vertical shear

Explanation: Ground is displaced and ground is subjected to sudden movements. This causes differential movements in building leading to horizontal shear.

3. What will be the static lateral force at 10th level of a structure if total gravity load is x and portion assigned to the 10th level is 10%
a) x
b) 0.1x
c) 0.01x
d) 0.001x

Explanation: Fx = 0.01wx.

4. The fundamental natural period of a building is independent of the mass of the structure.
State whether the above sentence is true or false.
a) True
b) False

Explanation: The fundamental natural period of a building is dependent upon mass and stiffness of the structure.

5. Calculate the fundamental natural period of a building made with reinforced concrete moment frames and with the height of highest level as 50ft.
a) 0.676
b) 0.686
c) 0.696
d) 0.666

Explanation: Ta = Ct hnx, Ct = 0.02, x = 0.9.

6. What will be the minimum value of total static lateral base shear for a hospital id SDS = 0.15g?
a) .0079gw
b) .0089gw
c) .0099gw
d) .0109gw

Explanation: Vmin. = 0.044SDS IW hospitals have an importance factor of 1.5.

7. What will be Vmax if the minimum value of total static lateral base shear for a hospital id SDS = 0.15g and the hospital is made up of structural steel frames?
a) .01813gw
b) .02813gw
c) .03813gw
d) .04813gw

Explanation: Vmax = SDSW/(R/I), and value of R foe structural steel frames is approximately 8.

8. Minimum value of total static lateral base shear for a hospital id SDS = 0.15g and the hospital is made up of structural steel frames. Calculate the value of V if T = 1.676.
a) .01678gw
b) .02678gw
c) .03678gw
d) .04678gw

Explanation: V = SDSW/(TR/I) Also, we can see that Vmax > V > Vmin in this case. Otherwise, we will have to modify the value of V to one of the boundary limits.

Sanfoundry Global Education & Learning Series – Structural Analysis.