II. A 5-story office building below has the steel special moment resisting frames for the seismic force resisting system. Each story is 12 ft tall. The story displacements are given as shown from the linear elastic analysis. The following is required: 1. What is the elastic story drift (inter-story displacement) at level 5 (roof) and level 3, respectively. 2. What is the design story drift ratio for level 5 and level 3, respectively. 3. What is the allowable story drift ratio for this building? Justify your answer. 2.75" k 2.32" 1.87" 1.42" III. Below are the seismic design parameters of a building: O Site shear wave velocity for the top 100ft (vs) = 1100 ft/sec (assume no clay, peat or liquefiable soils) ○ Mapped spectral response acceleration at 0.2-sec period, Ss = 1.00 (g) ○ Mapped spectral response acceleration at 1-sec period, S₁ = 0.45 (g) Building period, Ta = 0.80 sec ○ Long-period transition period, T₁ = 8 sec Required: 1. The site class of the building 2. The design spectral response acceleration, Sa 3. The seismic base shear for equivalent force procedure design (in terms of W, the total effective seismic weight of the building)
II. A 5-story office building below has the steel special moment resisting frames for the seismic force resisting system. Each story is 12 ft tall. The story displacements are given as shown from the linear elastic analysis. The following is required: 1. What is the elastic story drift (inter-story displacement) at level 5 (roof) and level 3, respectively. 2. What is the design story drift ratio for level 5 and level 3, respectively. 3. What is the allowable story drift ratio for this building? Justify your answer. 2.75" k 2.32" 1.87" 1.42" III. Below are the seismic design parameters of a building: O Site shear wave velocity for the top 100ft (vs) = 1100 ft/sec (assume no clay, peat or liquefiable soils) ○ Mapped spectral response acceleration at 0.2-sec period, Ss = 1.00 (g) ○ Mapped spectral response acceleration at 1-sec period, S₁ = 0.45 (g) Building period, Ta = 0.80 sec ○ Long-period transition period, T₁ = 8 sec Required: 1. The site class of the building 2. The design spectral response acceleration, Sa 3. The seismic base shear for equivalent force procedure design (in terms of W, the total effective seismic weight of the building)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Please solve problem #2. You can use the ASCE 7-16 as a reference.
Transcribed Image Text:II. A 5-story office building below has the steel special moment resisting frames for the seismic force
resisting system. Each story is 12 ft tall. The story displacements are given as shown from the linear
elastic analysis. The following is required:
1. What is the elastic story drift (inter-story displacement) at
level 5 (roof) and level 3, respectively.
2. What is the design story drift ratio for level 5 and level 3,
respectively.
3. What is the allowable story drift ratio for this building?
Justify your answer.
2.75"
k
2.32"
1.87"
1.42"
III. Below are the seismic design parameters of a building:
O Site shear wave velocity for the top 100ft (vs) = 1100 ft/sec
(assume no clay, peat or liquefiable soils)
○ Mapped spectral response acceleration at 0.2-sec period, Ss = 1.00 (g)
○ Mapped spectral response acceleration at 1-sec period, S₁ = 0.45 (g)
Building period, Ta = 0.80 sec
○ Long-period transition period, T₁ = 8 sec
Required:
1. The site class of the building
2. The design spectral response acceleration, Sa
3. The seismic base shear for equivalent force procedure design (in terms of W, the total
effective seismic weight of the building)
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