Lesson 1: Shearwalls Program Overview
Lesson 2: The Shearwalls Program
Lesson 3: Diaphragm Analysis
Lesson 4: Shearwall Design: Capacity vs. Deflection Based Force Distribution
Lesson 5: Shearwall Design - Deflection Analysis
Lesson 6: Outputs, Data and Information Management
Lesson 7: Single Shearwall & Manual Load Design - An Example
Lesson 8: How Quickly a Structure Can be Modelled
Course Summary
Lesson 8 Assessment
Difficulty Level: 5/5
Estimated Time to Complete: 30 minutes
Problem Statement: Design of a 3-story Building
The figure below shows a floor plan and elevation along with the preliminary shear wall locations for a 3-storey light wood-frame building. It is assumed that some preliminary calculations have been provided to determine the approximate length of the wall required to resist the lateral seismic loads.
Given Data:
- Building area: A = 40’ x 60’
- Seismic mass
- Wr = 25 psf (roof) (Included dead load)
- Ws = 10 psf (full snow load on roof)
- Wf = 40 psf (floor)
- The mass of walls are already factored in the mass of floors
- Floor to floor height: h = 8’
- The roof is flat (2 degrees slope and no overhang)
- Building is regular
- Wind speed = 130 mph
- Seismic risk category 2
- Ss = 0.75 and Sa = 0.4
- Sheathing and framing
- Use plywood for sheathing
- SS D.Fir. L (38 x 140) for framing
- Stud spacing: To be determined
- 4 Studs at each end of shearwall segments
- Hold-down type : HDU8-SDS2.5
- Use hold-downs on all segments
- Apply hold-downs at all openings
- Use the shearwall deflection to calculate rigidity, and distribute force on wall segments based on rigidity
- Always linearize deflection equation
Design Requirement:
Use the software to design the shearwalls and provide answers to the questions below.