Garage Shear Wall Line Design: Multiple Panels with Opening per SDPWS C4.3.5.5.1

Example

In a residential building, a garage end wall has openings between shear wall segments. The wall line has three panels: 8 ft wide, 6 ft wide (narrowest), and 8 ft wide, each 8 ft tall. There is 6 ft between each panel (garage door opening). The total lateral wind load at the top of the wall line is 5,000 lb. Dead load is 45 plf. Check capacity and size hold-downs for each segment end. Boundary forces T and C from Eq 4.3-7 drive hold-down design.

How StructSuite solves this

StructSuite's free shear wall design calculator uses SDPWS C4.3.5.5.1 simplified approach to distribute shear in proportion to strength of each wall. Nominal capacity from Table 4.3A; Va = Vn/2.0 for wind (§4.1.4.2). Boundary forces T and C per Eq 4.3-7 computed for each segment end. In Step 4 select hold-down model per governing demand; anchor bolt diameter shown in Simpson table.

Steps

1. Step 1: Geometry & Configuration

   Design consideration: Shear distributes by relative strength: stronger segment takes more force. Narrowest (6 ft) often critical—least capacity, may receive similar shear as 8 ft segments. Each segment needs hold-downs at both ends. Garage doors typically 8–9 ft; 6 ft opening = single door or custom.

   In StructSuite: Open Step 1: Geometry & Configuration. In Shear wall line — segments and spacing, for Shear Wall 1 set Height, h (ft) = 8 and Length, b (ft) = 8. Click the + Add wall button. For Shear Wall 2, set Height = 8, Length = 6. Click + Add wall again. For Shear Wall 3, set Height = 8, Length = 8.

2. Step 1: Geometry & Configuration

   Design consideration: Opening width (6 ft) does not directly affect shear capacity but affects collector design—forces must transfer around openings. Larger openings = longer collectors, more chord force. Spacing used in C4.3.5.5.1 simplified method for distribution.

   In StructSuite: In Step 1: Geometry & Configuration, in the Distance to next wall (ft) input for each wall segment: enter 6 for Distance 1 (between SW1 and SW2) and 6 for Distance 2 (between SW2 and SW3).

3. Step 3: Load Definition

   Design consideration: 5,000 lb total on 22 ft of wall (8+6+8) ≈ 227 plf average. Garage end walls often receive 20–30% of total diaphragm force. Wind typically governs for residential garage; seismic in SDC D+ may control.

   In StructSuite: Open Step 3: Load Definition. Under Lateral force at top of shear wall line, in the W — Wind (lb) input box enter 5000.

4. Step 2: Sheathing & Fasteners

   Design consideration: Same sheathing for all segments = same Vn per foot; distribution proportional to length. Simplifies ordering and construction. If one segment is critical, consider upgrading only that one (adds complexity).

   In StructSuite: Open Step 2: Sheathing & Fasteners. In the SDPWS 2021 Table 4.3A grid, find the row for Wood Structural Panels - Sheathing, 15/32 in., 8d common. Click the cell in the 6 in. edge spacing column to select it.

5. Step 4: Boundary Members & Hold-Downs

   Design consideration: Six chord locations (two per segment) need hold-downs. Narrowest segment (6 ft) has highest unit shear and often highest T. One hold-down model for all simplifies spec; size for max T. Interior segment ends share uplift—check both tension and compression.

   In StructSuite: Open Step 4: Boundary Members & Hold-Downs. Under Hold-down model, select DF/SP or SPF/HF for species. In the Simpson Strong-Tie table, click the row for a hold-down model (e.g., DTT2Z® for 1825 lb DF/SP, 1/2 in. anchor bolt) whose capacity exceeds the max tension (T) from overturning. The anchor bolt diameter column shows required bolt size. Open Step 5: Design Verification to confirm D/C ≤ 1.

6. Step 5: Design Verification

   Design consideration: Each segment checked: demand ≤ Va. Governing segment shown. Collector design: chord force T at boundary; drag force along opening. Garage typically 2× framing; chord may need splices.

   In StructSuite: Open Step 5: Design Verification. Scroll to verify capacity checks pass for each wall. Open Step 6: Summary & Visualization. Use the boundary forces T and C shown for hold-down specification at chord locations. Note: Hold-down sizing UI is under construction.

Live design (pre-filled)

The form below is the real StructSuite module with example data loaded. Display only—values cannot be changed.