5 Questions
What is the assumed thickness of the walls for the analysis?
10.0 in.
What is the length of walls A, B, and C?
22 ft
What is the period of vibration estimated using Eq. (12.8-7)?
0.42 s
What is the base shear computed using the ground motion parameters?
830 kip
Why is a three-dimensional analysis required for the structure?
In-plane deformations of the semirigid diaphragm
Study Notes
Accidental Torsion and Amplification
- Accidental torsion is considered in structures analyzed using equivalent lateral force or modal response spectrum approaches.
- Systems with rigid and semirigid diaphragms are considered for accidental torsion.
- Accidental torsion need not be considered for systems with flexible diaphragms.
Building Characteristics
- The building is a five-story reinforced concrete shear wall building.
- The first story is 12 ft, 4 in. tall, and the upper stories are each 11 ft, 4 in. tall.
- The building is located in central Missouri.
- The building houses various business offices and is classified as Risk Category II.
Seismic Design
- The design spectral accelerations are SDS = 0.45 g and SD1 = 0.19 g.
- The Seismic Design Category is C.
- An ordinary reinforced concrete shear wall can be used with design parameters R = 5 and Cd = 4.5.
Test your knowledge of torsional loading, torsional irregularities, accidental torsion, torsional amplification, and application of accidental torsion to structures analyzed using the equivalent lateral force or modal response spectrum approaches.
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