The challenge
Wide garage door openings leave little wall for bracing, so the lateral system combines steel moment frames, Strong-Wall panels and wood shear walls in a high seismic region.
Residential · Temecula, California, USA
Estate Residence, ADU & Six-Car Garage
Structural design for a large estate — the main house and ADU, plus a two-level six-car garage with steel moment frames and Strong-Wall shear panels at its wide openings.
- Structure
≈490Pages of calcs
38Structural sheets
0.79Max frame code check
96 mphDesign wind
- Sector
- Residential
- Location
- Temecula, California, USA
- Year
- 2026
- Status
- Permit set
- Deliverables shown
- 16 drawings & views
Case study
Structural engineering for an estate property: a main house with an ADU, and a separate two-level six-car garage.
An estate property in Temecula with a main house and ADU, and a separate two-level garage for six cars. The garage’s wide door openings leave little solid wall, so its lateral system combines steel moment frames, analysed in RISA-3D, with Simpson Strong-Wall panels and wood shear walls. In the main house, steel W-shape beams and columns work alongside LVL and glulam framing. Axisys designed the structure of both buildings, including the steel connections, hold-downs and foundations, and issued permit drawing sets with full calculation packages.
What Axisys did
- Seismic weight and base shear for the garage and the main house & ADU
- Steel moment frame analysis and design (RISA-3D)
- Steel connection design (IDEA StatiCa)
- Wood shear walls, Strong-Wall panels and hold-downs
- Steel, LVL and glulam beams, headers and posts
- Footings, grade beams and slab on grade
- Permit structural drawing sets and calculation packages
Outcome
Two 19-sheet structural permit sets and about 490 pages of calculations.
ENG
Engineering data
Estate Residence, ADU & Six-Car Garage
From the project drawings & calculations
Structural system
Light-frame wood shear walls with Simpson Strong-Wall panels and steel moment frames at the garage openings; steel W-shape beams and columns with LVL and glulam framing in the main house, on concrete footings, grade beams and slab on grade.
Design codes & standards
- ASCE 7-16
- ACI 318
- NDS
Design criteria
- Risk category
- II
- Design wind speed
- 96 mph
- Mapped spectral acceleration
- Ss 1.39g · S1 0.509g
- Design spectral acceleration
- SDS 1.112g
- Site class
- D (default)
- Lateral system
- Wood shear walls (R = 6.5), steel moment frames
- Garage seismic base shear (ASD)
- 17.8 kips
- Main house & ADU seismic base shear (ASD)
- 20.9 kips
Design loads
- Garage seismic weight
- 188 kips
- Main house & ADU seismic weight
- 221 kips
Key members & sections
- W18x50 / W8x21 moment frames
- W12x26, W12x35, W24x62 steel beams
- HSS6x6x1/4 columns
- LVL & glulam beams and headers
- Strong-Wall WSW / WSWH panels
- HDU2 / HDU5 / HDU8 hold-downs
Software
- RISA-3D
- IDEA StatiCa
- ForteWEB
- TEDDS
01 · Sections
3 sheets · click to zoom
02 · Structural
13 sheets · click to zoom
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