250+ TOP MCQs on Equivalent Lateral Force Procedure for Estimating Seismic Loads – 1 and Answers

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Structural Analysis Multiple Choice Questions 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
Answer: b
Clarification: 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
Answer: b
Clarification: 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
Answer: d
Clarification: 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
Answer: b
Clarification: 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
Answer: a
Clarification: 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
Answer: c
Clarification: Vmin. = 0.044SDS IW hospitals have an importance factor of 1.5.

7. What will be Vmax in the above question if the hospital is made up of structural steel frames?
a) .01813gw
b) .02813gw
c) .03813gw
d) .04813gw
Answer: b
Clarification: Vmax = SDSW/(R/I), and value of R foe structural steel frames is approximately 8.

8. Calculate value of V in above question if T = 1.676.
a) .01678gw
b) .02678gw
c) .03678gw
d) .04678gw
Answer: a
Clarification: 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.